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1. Remove water from the breathing loop with the LCV HUD BUD use STATUS monitoring Gas share witha buddy User demonstrates how to clear water from the breathing loop Understand Hand set computer operation STATUS monitoring Menu System amp HUD BUD User demonstrates gas sharing witha buddy To learn how to sur vive a partial flood due to mouthpiece loss etc To understand the STATUSdisplay and the HUD light and vibration motor alarms To understand the set up menus of EXPLORER To practice deploy ing and receiving a second stage bailout Towards the end of a dive move to an upright position switch to open cir cuit and shake loop above head to any drain water from mouthpiece and hose then return to CCR Continue breathing as nor mal and the LCV system will vent wa ter from the loop If on an ascent simply continue ascending until the counter lung over pressurizes Water will drain through the LCV Using the Simulator APP and during dives review the STATUS informa tion Using the Simu lator APP and the display understand the surface menu s Stay on the EX PLORER Allow a Buddy to use the Buddy regulator Initially conduct in a horizontal swim then during an as cent to 6m 20ft 101 EXPLORER SKILLS COMPLETED DRY SKILLS 1 Management of O rings Student Instructor 2 Assemble the unit Student __ Instructor 3 Proper dive planning Studen
2. 2 Inspect all O rings for cracks and other damage during each assembly 3 All breathing loop parts should be sanitized before diving If assembling for a dive see the following section Complete Disassembly and Reassem bly for further instructions Step 1 Remove all parts from the split top box Fig 2 1 Step 2 Open the Oxygen sensor and CO sensor optional boxes Re move the sensors from their boxes and open up the airtight bags Fl DANGER Only Hollis Explorer Oxygen sensors must be used with this unit No other sensors are tested or approved These are avail able from your Hollis Dealer El DANGER All oxygen sensors must be allowed to sit in an AIR at mosphere for at least 24 hours prior to use in the EXPLORER The Sensors can be immediately assembled into the Sensor Module but this module should not be fully installed for at least 24 hours after unsealing the sensors packages WARNING The sensors must be calibrated after the 24 hour accli mation period Step 3 Pull the Sensor Module straight out of the Canister Step 4 Push the three oxygen sensors onto their respective connection points as shown in the picture Fig 2 2 Fl NOTE Ensure the oxygen sensors are installed with the white membrane facing up as shown Fig 2 2 Step 5 If using the optional CO sensor inspect the sensor cap assembly Fig 2 3 Ensure the hard white filters are installed flat in the Filter Cap and Filter Body F
3. EAC LOSss USER MANUAL EXPLORER ORT REBREATHER This is the operations manual for the HOLLIS EXPLORER This manual specifications and features of the Explorer are proprietary and copyright Hollis Inc 2012 This document cannot be copied or distributed without the prior agreement and authorization from Hollis Inc All information contained is subject to change Contact the manufacturer for the latest information www hollisgear com The EXPLORER is manufactured in the USA by Hollis Inc 2002 Davis Street San Leandro CA 94577 USA Ph 510 729 5100 EC Type approved by SGS UK Ltd Weston super Mare BS22 6WA Notified Body No 0120 Testing conducted by ANSTI Test Systems Hants To ensure your user information is up to date Please check www hollisgear com support asp for updates to this manual For warranty information see www hollisgear com Ssupport_warranty asp DANGERS WARNINGS CAUTIONS AND NOTES Pay attention to the following symbols when they appear throughout this docu ment They denote important information and tips Fl DANGERS are indicators of important information that if ignored would lead to severe injury or death IH WARNINGS are indicators of important information that if ignored could lead to severe injury or death l CAUTIONS are indicators of information that if ignored may lead to minor to moderate injury Fl NOTES indicate tips and advice that can inform of features
4. e Inhalation Remove from exposure Seek medical attention e Skin Contact Drench with clean water and seek medical attention if skin becomes inflamed e Eyes Irrigate thoroughly with clean water Seek medical attention e Ingestion Wash out mouth thoroughly with clean water Seek medical attention Safety data on absorbent products can be found at hittp www molecular products co uk I WARNING For standard scrubber packs always fill scrubber packs in a well ventilated environment Avoid contact with eyes and skin FILLING STEPS STANDARD PACK VERSION ONLY I WARNING The standard scrubber pack is to be professionally packed unless you have been trained and certified by a recog nized agency to do so yourself At the time of this writing some agencies require recreational divers to have a professional ie Ex plorer instructor or a dive professional authorized by Hollis to fill Explorer scrubber packs pack the scrubber or use the pre pack version Check with your instructor for further information on your training agency s current standards Filling a scrubber improperly could lead to a hypercapnia incident 1 Remove the Scrubber Pack from the Canister Inspect the quad ring for cleanliness damage and clean replace with a small amount of lubricant Fig 4 2 2 Unscrew the yellow top nut and canister lid and inspect the meshes for damage 3 Remove any excess absorbent stains from the canister components with warm
5. 10 s or 1 min the computer takes a snapshot of dive data stored for later download Us ing a shorter interval results in more data points per dive and fewer stored dives for download data respectively Longer data intervals result in fewer data points less detail but the space to store more dives TIME DATE This is the clock and calendar setting Fig 3 13 El NOTE When the EXPLORER is first powered up from a discharged battery you will be asked to update the date and time 32 SETUP UNITS Imperial FtipsifdegF LOGGING INTERVAL 10s TIME DATE DEFAULT GAS HP PAIRING SERVICE MODE Off t CHANGE L Fig 3 12 23 17 59 i k E amp F T f Fig 3 13 DEFAULT GAS FIG 3 74 DEFAULT GAS Set this to your analyzed dive gas During the Pre dive checks if EXPLOR ER analyzes a different gas it will alarm and ask you to recheck the anal ysis For further detail on the proper use of this function see the following YOL 40 CUF I section Bailout and Gas Configuration 40 EANx HP PAIRING 4 To pair the HP transmitter first press SEARCH Any transmitters within ae range of the LSS will be displayed Once the system finds the transmitter HP PAIRING press PAIR The word PAIRED will appear Fig 3 15 The transmitter ID is written on the transmitter attached to the first stage in your EXPLORER Fig 3 16 Please confirm this is the correct transmitter El NOTE The HP
6. 20n min Ascent Rate Near Stop Too Deep No Commsor Stale l At Stop Gaua V Low Control No Comms Stale m High Span or o ka Se Cell1 Bad or Cell 2 Bad or Cell3 Bad one only No Comms Stale or Unpaired Resource Low estimated time remaining o prevent reaching the 30bar reserve gas pressur once on the surface expired High or V High Contro Initial Diving After No Resource Checks on RR Resource Low estimated time remaining to prevent a Very High state once on the surface expired Resource Low estimated time remaining to prevent an Empty state once on the surface expired Resource Low estimated time remaining to prevent an Empty state once on the surface expired OK Too Shallow 65 PPO Bad Cell States Are As Follows e Cell input timed out e Cell input stale e Calibrated sensor input gt 3 00 bar e Calibrated sensor input lt 0 15 bar e Raw sensor input lt 7 mV e Cell input excluded having failed calibration e Calibrated cell input gt 0 2 bar from the other two cells only a single cell can be in this state PPO Ascend Alarm States Are High Span PPO cell span gt 0 5 bar if 2 or 3 cells in state OK Bad Cells 1 cell in state OK or no cells in state OK but with different high low alarm states or the same alarm states and no O C bailout case V Low
7. El DANGER The TPM will not detect breakthrough conditions of a poorly packed Scrubber or failing seal Therefore Pre breathe checks must always be carried out to ensure CO is being absorbed correctly by the scrubber The TPM contains 5 temperature sensors arranged longitudinally through the canister absorption path The readings from these 5 temperature sen sors are logged and analyzed by the system the following describes ome of the limitations of the TPM are as follows The CO absorbent produces heat when CO is absorbed However there is also a temperature rise even when incomplete absorption of the CO in 45 46 the breathing gas is achieved This is a potentially dangerous situation as the system appears to be working correctly as there is still a measurable temperature rise and wavefront in the system The human body is tolerant to only approximately 5 to 10 mBar of CO ref CE standards for a life support system A well packed fresh Absorbent Scrubber absorbs all the exhaled CO for a period of time until an amount of CO starts to creep through When this level reaches 5mb it is assumed there is no life left in the scrubber However even at 5mb there is still considerable thermal activ ity within the scrubber Hl DANGER Be aware that a well packed and well maintained Scrub ber is key in achieving a life support system The CDM is not a sub stitute for good system maintenance and Pre Dive checks Always use your tr
8. MANDATORY DIVING SKILLS SECTION 1 EXPLORER BASICS SECTION 2 IN WATER SKILLS CHART SECTION 3 EXPLORER SKILLS COMPLETED PART 7 LONG TERM MAINTENANCE amp SERVICE SECTION 1 O SENSORS SECTION 2 SERVICE SECTION 3 MAINTENANCE SCHEDULE PART 8 APPROVED PRODUCTS amp GLOSSARY SECTION 1 APPROVED PRODUCTS SECTION 2 GLOSSARY YOUR NEW EXPLORER REBREATHER LIFE SUPPORT SYSTEM RULES El DANGER Read and understand this list prior to using this unit If you do not understand any or all of this section please contact your training agency or Hollis Rules for EXPLORER Diving 1 Always complete all pre dive checks Pay special attention to BOV mushroom valve tests 2 Always pre breathe the Explorer Sport Rebreather until the system passes its tests 3 Do not modify the EXPLORER without the manufacturer s written con sent 4 Do not use a full face mask Unless approved by Hollis for use with the EXPLORER 5 Always analyze your gas 6 Never dive a unit you suspect is leaking and has not passed all the pre dive tests 7 Never leave your BOV open on the surface 8 Ensure your BC is inflated at the surface 9 Take time to adjust your weight correctly do not dive over weighted 10 Always dive with buoyancy control and buoyancy inflation 11 Practice a skill on every dive 12 Avoid unnecessary mask clearing 13 Regularly sanatize the unit 14 Never exceed the CO alarms 15 Never hold your
9. The EXPLORER can be fully activated in three separate ways 1 By button push 2 By breathing breath detection as a low PPO of 0 17 is reached 3 At depth gt 1 15 bar absolute pressure or about 5 ft 1 5 m El DANGER The batteries must be charged for the automatic systems to work If the batteries are not charged the unit will not turn on and not support life To turn on EXPLORER simply press both buttons on the handset and hold for 3 seconds After which the Hollis solash screen and then the training acknowledgement screen Fig 4 4 will appear El DANGER It important that you have read this manual and are prop age erly trained in order to complete the Pre dive sequence and dive EXPLORER safely If you have not undertaken these steps yet do not proceed any farther Fig 4 4 By selecting CONFIRM the Pre dive sequence starts and you will be prompted through the sequence PRE DIVE CHECKS PURPOSE These tests are designed to 1 Check that all functions of the EXPLORER have a high likelihood of oper ating correctly 2 Detect assembly errors 3 Detect breathing loop errors 4 Advise the user of system measurements that are outside correct S86 operating parameters including a High Pressure readings too low b High Pressure readings dropping too quickly possible leaks c Battery Levels d PPO partial pressure of oxygen in the breathing loop e Calibration of PPO CO sensors performed correctly f
10. Ensure the CO absorbent is functioning correctly and the filter is inserted correctly and is sealed THE COMPLETE PASS MODE PRE DIVE SEQUENCE The complete sequence is detailed on the following page This sequence assumes all tests pass OK and no Pre dive has been conducted within one hour The full screen chart is available on the CD enclosed with the prod uct An APP for any Android device is available at http hollis com support asp and on the enclosed CD with your EXPLORER B87 1m 00 52 58 I HAVE READ AND UNDERSTOOD THE MANUAL I HAVE COMPLETED 4 RECOGNISED TRAINING COURSE I KNOW HOW TO OPERATE l THIS EQUIPMENT i MENU CONFIRM mm 3 CHECK RUBBER MOUTHPIECE AND MUSHROOM VALVES mm 99 PLEASE WAIT 255 NEGATIVE TESTING LOOP r TT EE OPEN MOUTHPIECE CONFIRM e xcs CE CHECKED OK CONFIRM ss PLEA SE Wy H pan I TT SERFORMING SYSTEM CHECKS TT ia CONNECT HOSES CLOSE HP CYLINDER VALVE AND OPEN MOUTHPIECE CONFIRM im S8 ENSURE MOUTHPIECE CLOSED OPEN HP CYLINDER VALVE CONFIRM cm 888 ox 40 EVACUATE LOOP TO TEST ADY m o M EE NEY CO FILTER FIT TED 104 66 Y ES Te MANUAL CO2 SENSOR OR O2 CELL CALIBRATION ne eia Hatra PHO Ss J mm 929 FILL LOOP THEN EVACUATE LOOP AND CLOSE MOUTHPIECE CHH CONFIRM ma SR j PLEASE WAIT 34s PRESSURISING OOP mm 8 EE ES BLOCK NOSE AND BREATHE MIE FOR 4
11. PART 2 Section 1 ABSORBENT DISPOSAL Absorbent must be changed in accordance with the PART 4 Section 2 of this manual BCD Drain any water from the BCD Re inflate operate dump valves and the inflator to confirm everything is OK MANDATORY DIVING SKILLS EXPLORER BASICS The primary diving skills required to use the EXPLORER will be covered in your chosen agency s training program and will not be reviewed here However there are certain unit specific skills which must be covered during your training course These are detailed below LEAK TESTING See PART 4 Section 1 CALIBRATION See PART 3 Section 12 HARNESS ADJUSTMENT see the Hollis Buoyancy Guide doc 12 4012 BUOYANCY CONTROL AND TRIM Initially in shallow confined water you will be required to maintain a hov ering simulated decompression stop You will then practice short ascents descents initially Ascents will be made from progressively deeper depths and will involve the use of a Surface Marker Buoy OPEN CIRCUIT BAILOUT On every dive you will practice switching to the BOV and or bailout stage bottle On some dives you may be required to conduct additional bailouts possibly back to the surface as defined by your instructor Preparing the unit for diving and maintenance cleaning You will be shown how to assemble the unit and complete the pre dive check sequence In addition you will be shown how to care for your unit post dive FLOOD RECOVERY Condensate
12. aid assembly or prevent damage to the product EXPLORER DESIGN TEAM Bob Hollis Kevin Gurr HollisExplorer User Manual Document Control Number 12 4102 Rev 4 Publish Date 1 3 2014 Kel REBREATHER U WARNING Use of The Explorer manual This user manual does not nor is it intended to contain any information needed to safely dive with any type of SCUBA apparatus It is designed as a guide for the proper setup operation maintenance and field service of the Hollis Explorer only It does NOT take the place of a recognized training agency instructor led diver training course or its associated training manual s and materials This user manual is intended to be used only as a type specific ad dition to such training and materials and as a user reference This manual cannot be used as a sub stitute guide for any other type of Self Contained Underwater Breathing Apparatus SCUBA Photo by AAA m UB eee a a iV GENERAL SAFETY STATEMENTS WARNINGS W WARNING GENERAL SAFETY No person should breathe from or attempt to operate in any way a Hollis Explorer rebreather or any component part thereof without first completing an appropriate Hollis Certified user training course Further no Explorer diver should use a Hollis Explorer without direct Hollis instructor supervision until they have mastered the proper set up and operation of the Hollis Explorer rebreather This includes new Explorer divers as well as Exp
13. and the user could easily lose conscious ness with little or no warning and as such it is potentially extremely danger ous to work at any CO level above the 10mb range MAIN FEATURES The CO sensor consists of a proprietary combination of filters and sensors that together provide a robust CO monitoring system for breathing loops in rebreathers The CO sensor is able to compensate for pressure and humidity environments as normally achieved in a diving rebreather system The EXPLORER version is powered from the LSS Module rechargeable battery The CO sensor requires occasional calibration EXPLORER has a sophis ticated logging system that minimizes the number of calibrations It also removes the need to use CO calibration gasses WHAT SHOULD EXPECT TO SEE ON THE CO SENSOR READINGS As a unique CO sensor in an active breathing loop some user education is required to understand the benefits features and limitations of the de vice From this standpoint it is worth the user taking a short time to under stand more of how CO is dealt with in the breathing loop CO scrubber endurance is reduced by increased depth low water tem perature and high work rate CO generation variables As the user push es the CO absorbent scrubber towards or past the end of its CE tested limits the levels of CO in the loop may be surprisingly high or could be low if the variables are less extreme but could accelerate rapidly depen dant on
14. Never submerge sensors in liquids e Never attempt to open a sensor They contain a caustic chemical e Sensors deteriorate very slowly and near the end of their useful life may show a drift soon after calibration e The oxygen sensors are not covered by the warranty they must be replaced every 12months or at their do not use after date or sooner depending on the pp02 they are stored in and the hours of use e Oxygen sensor usage temperatures are Operating temperature range 0 40 C 32 104 F Storage temperature 20 to 50 C 4 122 F Recommended storage temperature 5 to 15 C 41 F to 59 F fl DANGER Always be careful when doing manual calibrations The oxygen sensors must be exposed to air and NO OTHER GAS Oxygen sensor calibrations conducted once a week should be more than sufficient unless the EXPLORER has been transported to different climates locations or significantly different ambient conditions Prior to starting a pre dive sequence it is advisable to check the oxygen and CO sensor if equipped calibration by opening the EXPLORER Module and removing it and the Sensor Module Place the two together and turn the unit on Then go to the STATUS screen and view the PPO and CO readings If the PO is not 0 21 and the CO if equipped is not 0 3 0 4 mb then a calibration must be performed 39 In general Oxygen and CO sensors do not drift excessively Constant calibration every
15. Venting will occur natu rally if the diver is weighted correctly With a flooded loop the diver must carry sufficient additional buoyancy to overcome approximately 5 kg 42 Newtons 11 Ibs of buoyancy loss IN WATER SKILLS In water skills are a vital element of dive training It is important especially when teaching complex skills or equipment that training is progressive Non progressive training only serves to scare and confuse students and 96 at best reduce the learning experience to a series of hoops that should be jumped through This is not the goal at all the desire to learn should be nurtured by making the experience as informative fun and as exciting as possible Only then will the subject matter and key survival skills be remembered As in all training while certain skills must be mastered first before the student can progress safely to the next level there are always issues that affect the training sequence These can include 1 Environment 2 Support logistics 3 The students ability to learn Your instructor will sequence skills according to standards of the agency you will be certified through Though all agencies will complete the same list found in the In Water Skills Chart section of this chapter additional skills may vary by agency DIVING SAFETY GUIDELINES After ALL drills involving a cylinder or valve isolation the instructor should confirm the valves are again open before completing the
16. White Vinegar Crystal Simple Green or Dawn or similar mild dish detergent MAINTENANCE PRODUCTS Dow Corning 7 Silicone non O clean parts only CRISTO LUBE MCG 111 Tribolube 71 DeoxIT Gold GN5 Electrical Contact Cleaner Other products not listed may be appropriate for use with the Explorer If there is a particular product which you wish to use please call the factory to make sure the product does not contain chemical components which may be harmful to components within the rebreather or the diver L CAUTIONS Consult manufacturer Material Safety Data Sheets for further safety recommendations for these materials Never use the following products or families of products on ANY part or surface of the Explorer rebreather Products which contain alcohol high concentrations of chlorine ammonia gasoline Benzene or any petrochemical based solvent Basically any product with the suffix ene in it Polishes wax automotive cleaning products Glues binding agents plastic fillers other than those listed in the maintenance and troubleshooting or approved products sections of the manual El DANGER Never attempt to clean your rebreather or any part of your rebreather in a dishwasher or any other type of machine that employs high pressure jets of cold warm or scalding hot water 108 GLOSSARY Absorbent chemical media used to remove CO from exhaled gas Absorbent Scrubber Pack Mechani
17. and no repairs or service work will be performed by any Hollis service professional until the altered Explorer unit is brought back into factory specifications by a Hollis service professional at the owner s expense W WARNING COMPUTER CONTROLLER SPECIFIC WARNINGS This computer is capable of calculating deco stop requirements These calculations are predictions of ohysiological decompression requirements Calculations are for contingency use only The Explorer in this sport configuration is not intended for decompression use V vi W WARNING HYPERCAPNIA HYPOXIA amp HYPEROXIA RISKS This device is designed to maintain a safe breathing gas under sport diving conditions But like all machines it could fail To mitigate risks it is essential that a diver is trained and fully understands the risks of hypercapnia CO poisoning hypoxia oxygen starvation and hyperoxia oxygen poisoning It is also critical to have adequate bailout gas for the planned depth Proper training and education are your best insurance against an inconvenient situation becoming a deadly one W WARNING ALTITUDE For the Explorer to accurately gauge altitude and the preceding dive depths the Explorer must be turned on prior to diving Additionally diving at high altitude requires special knowledge of the varia tions imposed upon divers their activities and their equipment by the decrease in atmospheric pres sures Hollis recommends completion of a
18. breath 16 Never start a dive with a low battery alarm 17 Always carry bailout gases of sufficient volume for the planned dive as per your training agency recommendations IF INDOUBT BAIL OUT GAS FLOW As the diver exhales gas flows through the hose blue arrow and over the right shoulder It then enters the absorbent scrubber and flows across the Oxygen and CO sensors in the Sensor Module and through the inhale hose red arrow and back to the mouthpiece Gas also naturally flows in and out of the exhale and inhale counterlungs A rh R api H Vy 7 Se BOV Bail Out Valve O amp CO Sensors Absorbent Scrubber Electronics Pack Inhale Exhale Counterlung Counterlung Scrubber In Out Indicator MECHANICAL FEATURES The EXPLORER is an electro mechanical rebreather Over time certain software hardware optional extras and or software upgrades will become available Please check www HollisGear com for details HARNESS BCD EXPLORER uses a custom bolt fitting backplate Solo webbing harness and Hollis C45LX Wing There is an optional EXPLORER BCD available COUNTERLUNG The EXPLORER comes complete with dual back mounted counterlungs BMCL These are attached to the canister by a screw threaded O ring fitting CYLINDER EXPLORER uses a 5L 40cuft cylinder with a nitrox compatible inline valve Dives over 18 m 60 ft requires that an add
19. cap and tube from the exhale counterlung to the Canister at the counterlung Fig 2 25 This is a 1 2 turn counter clockwise unlock Release the locking tabs as shown Fig 2 26 e Inspect the LCV counterlung mushroom valve and cap sealing ring for damage Fig 2 27 Replace re lubricate as required e In normal diving operations the canister should be flushed with fresh water rinsed with sanitizing solution and wiped clean STANDARD ABSORBENT SCRUBBER PACK DISASSEMBLY ASSEMBLY I WARNING The standard scrubber pack MUST be professionally packed unless you have been trained and certified by a training agency to do so yourself At the time of this writing some agencies require recreational divers to have a professional ie Explorer instructor or a dive professional authorized by Hollis to fill Explor er scrubber packs pack the scrubber or use the pre pack version Check with your instructor for further information on your training agency s current standards Filling a scrubber improperly could lead to a hypercapnia incident e Disassemble and discard the absorbent material as per local regulations Wash the scrubber pack in warm soapy water to remove absorbent debris Sanitize as required e Inspect the scrubber pack for damage especially around the Quad ring sealing face e Inspect and replace the quad ring seal at the first sign of wear or dam age e Inspect the upper and lower steel mesh for damage Your Hollis dealer
20. dive is not required Instead frequently check sensors for accuracy with a known gas air as previously described on the preced ing page If possible keep sensors dry between dives especially during storage I WARNING Use calibration sparingly not as an every dive task that may mask other potential problems CONDUCTING AN O SENSOR CALIBRATION During the Pre dive sequence you have the option to calibrate the oxygen and CO sensors from the Calibration screen Selecting O will display another series of screens that will guide you through the calibration Please see descriptions later in the manual for calibrating the optional CO sensor SUMMARY OF DO S AND DON TS OF OXYGEN SENSOR CALIBRATION When calibrating sensors there are two factors that the EX PLORER takes into account 1 Ambient pressure 2 Ambient AIR oxygen content These two factors multiply to determine the partial pressure of the oxygen exposed to the Oxygen sensor Example 20 9 oxygen at 1000mBar 0 209mBar partial pressure of oxygen 20 9 oxygen at 750mBar 15 675 mbar partial pressure of oxygen The EXPLORER uses ambient air as the calibrating gas because its composition is accurately known This is in contrast to say a cylinder of compressed oxygen that can vary from supplier to supplier as well as around the world from at least 94 to 100 AO To achieve a good calibration some basic rules must be ob served 1 The Oxygen se
21. excluded having failed calibration e Calibrated cell input gt 0 2 bar from the other two cells only a single cell can be in this state PPO Do Not Dive alarm states are No Comms All PPO cell alarms are No Comms Stale Any PPO cell alarm is Stale High Span PPO cell span gt 0 5 bar if 0 2 or 3 cells in state OK Bad Cells None or 1 cell in state OK Very High If O 2 or 3 cells in state OK and average PPO 2 0 bar Low If O 2 or 3 cells in state OK and average PPO lt 0 17 bar where PPO PPO setpoint i e the difference between the average PPO and the setpoint The average PPO is based on the calibrated value from all cells in alarm state OK Zero cells OK with the same high low alarm state in which case all three are used in the average 6s Blue Green Alarms High Smbar lt s CQ2 lt co mse High or V High Control if the predive Sequence is complete Es V Low Control if the predive sequence is complete Low AP lt 50bar No Comms or Stale No Comms or Stal Usage High 10barimin 2 HP Usage gt 2bar min or Usage V High gt 10bar min Surface No Resource Checks Predive Low 10 lt Filter lt 50 Low either LSS module or handset battery 10 lt Charge lt 30 Charging and Low either Loo LSS module or handset battery lt 100 Fail or Solonoid Valve Loss of LS
22. mitigates this risk W WARNING BATTERY WARNING The Explorer relies on batteries to maintain a safe breathing gas content Never dive the Explorer without a sufficient charge on the rechargeable batteries See Batteries PART 2 Section 1 for further details W WARNING DESIGN AND TESTING The Hollis Explorer has been designed and tested both in materials and function to operate safely and consistently under a wide range of diving environments You must not alter add remove or re shape any functional item of the Hollis Explorer Additionally NEVER substitute any part of the Hollis Explorer with third party items which have not been tested and approved by Hollis for use with the Explorer This includes but is not limited to hoses breathing assemblies electronics breathing gas delivery assemblies and their constituent parts sealing rings valves and their constituent parts and sealing surfaces latches buoyancy devices inflation and deflation mechanisms and onboard alternate breathing devices Altering adding removing re shaping or substituting any part of the Hollis Explorer with non ap proved parts can adversely alter the breathing gas delivery or CO absorption characteristics of the Hollis Explorer and may create a very unpredictable and dangerous breathing device possibly lead ing to serious injury or death Non approved alterations to functional parts of the Explorer will automatically void all factory war ranties
23. of carbon dioxide in millibars mbar Carbon dioxide absorbent filter scrubber estimated remaining time High pressure nitrox gas supply remaining in minutes at current depth and workload min 231 9psi Any decompression information NOTE The Status screen disappears after 5 seconds of inactivity if no alarms or 30 seconds if an alarm is present Alternatively a long press of both buttons will Hide the screen 29 30 MAIN MENU MAIN MENU SCREEN FIG 3 7 The EXPLORER has a simple menu system which is available while at the surface To access the Main Menu short press any button MENU NAVIGATION Action Button Press Enter Highlighted Short push both buttons Menu Item Long push both buttons Scroll Down Short push right button Scroll Up short push left button MAIN MENU OPTIONS SETUP setup is a basic settings menu See the following Setup Menu section for further details NDL PLAN It is a dive planner based on current tissue state surface interval and a DCP setting for the next dive Fig 3 8 PC LINK This screen is a gateway to updating the internal software and download ing the log information to a PC Fig 3 9 Further details can be found in the Internet Reprogramming PART 3 Section 21 of this manual LOGBOOK The Log Book screen is where you access recorded information on previ ously completed dives Fig 3 10 MENU SETUP NDL PLAN PC LINK LOGBOOK ABOL
24. oxygen breathed The oxygen metabolized by the body is replaced by the ox ygen component of nitrox injected into the breathing loop By knowing the volume and composition of gas injected the amount of metabolized oxygen and therefore the amount of CO created can be estimated From tests the duration of the scrubber types has been determined and the corresponding volume of CO absorbed before the absorbent begins to reduce its effectiveness Using these principles the system measures the amount of gas injected by the solenoid valve and converts it to a percentage of minutes remaining at CE CO rates Although the displayed minutes are at CE CO generation standards the minutes will tick down more slowly if the diver is breathing at a reduced rate This will be the most common scenario However in the unusual condition of CO generation at an elevated rate compared to 1 6ltr min then the minutes will tick off more quickly If the diver knows a particu larly strenuous dive is ahead they should allow extra conservatism in the minutes remaining counter for that dive The CDM combines the Nitrox Injection Meter Temperature Profile Moni tor and the Gaseous CO sensor to determine the appropriate state of the scrubber The remaining Nitrox injection meter percent is displayed on the STATUS screen as Filter minutes The Nitrox Injection Meter minutes are reset when the absorbent is replaced and confirmed in the Pre Dive Sequence I WARN
25. range 0 40 C Storage temperature 20 to 50 C Recommended storage temperature 5 to 15 C OXYGEN SENSOR CARE I WARNING For the sensor life prediction alarms to operate correct ly the oxygen sensors if removed MUST be replaced in the same position WARNING In the event of a faulty sensor all three sensors should be replaced together as it cannot be guaranteed that the scenario that made the first sensor fail has not affected all the sensors I WARNING Number each individual sensor before removal so they can be replaced in the same position Basic care includes e NEVER store sensors in any gas other than air e NEVER subject sensors to high temperatures i e Car trunks e NEVER freeze sensors left in cars overnight e NEVER subject sensors to physical shocks e NEVER subject sensors to vacuum e NEVER submerge sensors in liquids e Never attempt to open a sensor housing e Sensors deteriorate very slowly and near the end of their useful life may show a reading drift soon after calibration e always change all 3 sensors together and after a maximum of 12 months from first usage e Water and corrosion on the sensor jack plug may give false Oxygen readings Seawater may dry leaving a deposit on the jack connectors and the sensor membrane Always leave the sensor jack locking ring finger tight on the sensor socket If you Suspect corrosion remove the sensor from the sensor module and clean the jack plug w
26. specialized Altitude training course by a recognized training agency prior to diving in high altitude lakes or rivers W WARNING COLD WATER Diving rebreathers in frigid water requires special equipment training and preparation to prevent possible injury or death Rebreathers present unique variables to cold water diving that are not a factor in open circuit diving in the same temperatures Cold water diving is beyond the scope of this manual There are many variables not listed here Itis essential and the responsibility of the diver to be aware of all issues The diver must know how to best prepare their equipment and how to best prepare them selves for the cold water environment The diver must obtain further training beyond standard Explorer training or Open Circuit Ice Diver certification alone Cold Water Issues Include The Following Changes in temperature may lead to expansion and contraction of CO absorbent material possibly leading to channeling Decreases in temperature effect the efficiency of the scrubber and greatly reduce the rated use times Sensors are sensitive to extreme temperatures Storage of Oxygen Sensors below 32 F 0 or above 100 F 37 8 C can damage or greatly shorten the life of the sensor Mushroom valves may freeze open or closed if condensation is allowed to cool Always perform the Pre Dive Sequence and pre breathe the unit before entering the water and before any subsequent dives The di
27. stamped on the cylinder and must be checked before filling Refer to regional limitations for maximum fill pressures Install the nitrox cylinder into the case and tighten the cam band Now install the regulator DIN connection Fl DANGER Although the EXPLORER will analyze its own gas supply it is still important that you always analyze your gas prior to use Ii WARNING If you suspect that the cylinders have become contami nated with salt water or other contaminants then you must get the cylinder inspected and cleaned as appropriate 80 GAS ENDURANCE Gas endurance is defined by the Dive Control Parameter DCP setting With the cylinder pressurized to 200 bar 2940psi and assuming a usable gas pressure of the working pressure minus the regulator interstate pres sure of 11 bar 161psi this equates to 189 bar 2779psi available Assuming a DCP setting of 50 and a worst case FO of 32 The EX PLORER gas supply will last a maximum of 189 minutes based on normal swimming work rates At extremely high ventilation rates 75 l min which is sustainable by a fit Navy diver for only a matter of minutes the maximum gas endurance could reduce to as low as 57 minutes The EXPLORER will continuously update gas minutes remaining through out the dive for any DCP setting and work rate El DANGER High pressure gas cylinders especially nitrox cylinders must have their cylinder valves opened slowly to avoid risk of injury This dur
28. that the counterlungs are not pinched during in stallation of the Case Back Pinching counterlungs could puncture or cut the counterlungs leading to flooding and risk of drowning El NOTE The Case Back will not fit or lock properly if the end cap lock rings are not in the correct orientation Fig 2 13 Fig 2 14 Fig 2 15 Fig 2 16 La COMPLETE DISASSEMBLY amp REASSEMBLY INTRODUCTION The information below will enable complete disassembly cleaning rebuild ing and testing of the EXPLORER Rebreather Further disassembly must be performed by a qualified Hollis EXPLORER Technician GENERAL NOTES ON ASSEMBLY 1 All O rings should be lightly lubricated 2 Inspect all O rings for cracks and other damage during each assembly 3 Sanitize all breathing loop parts Fl DANGER Only Hollis Explorer Oxygen sensors must be used with this unit No other sensors are tested or approved These are avail able from your Hollis Dealer El DANGER ONLY the Hollis CO sensor may be used with this unit No other CO sensors are tested or approved I WARNING All non user servicing must be performed by an ap proved Hollis service facility Explorer service technician BOV DISASSEMBLY There are very few parts that should be removed by the customer within the BOV assembly since many parts especially the second stage compo nents require additional set up by a trained Explorer technician e Turning counterclock
29. the DCP with both the manual and auto matic settings Use the Manual and Auto DCP settings on the primary con troller To fully under stand the function adjustment of the DCP and how dif ferent settings effect Dive Control Parameter Adjustment Remove and replace unit on surface Electronics operation SMB deployment 100 User demonstrates comfort remov ing and replacing equipment User demonstrates competency and understanding of the use of the elec tronics User demonstrates deployment of an SMB followed by a safe ascent stopping at 6 m 20 ft while using the EXPLORER no stop times and endurance To ensure a diver is comfortable in the equipment can remove it in an emergency and im prove abillity to dive equipment from a small vessel To ensure the diver understands all functions with a fo cus on the STATUS system To ensure the diver can maintain buoy ancy and monitor displays while tasked with SMB deployment This skill is to be completed at the surface with weights removed and BCD inflated On the surface the diver should be able to demon strate navigation of the STATUS screens and an abillity to describe each screens meaning In the water the diver should be able to comfortably inter pret all displayed information This skill teaches students the rela tionship between PO changes due to ascent and buoy ancy changes
30. transmitter MUST have pressure applied to it to activate and be seen by the system If the regulator is not pressur ized the the transmitter will be off and not sending a signal Fig 3 15 SERIAL NUMBER BM XXXXKXKX KARX SERIAL NUMBER Fig 3 16 SERVICE MODE service Mode is used by Explorer service technicians performing diag nostics The settings are off on The default setting is off 33 BAILOUT AND GAS CONEFIGURATION DEFAULT GAS SETTING The EXPLORER has the capability to analyze the dive gas attached to the system If this gas differs significantly from what the EXPLORER expects the programmed Default Gas then a warning will be given during the pre dive sequence This is to help protect against absent or faulty gas analysis by the gas supplier and user DEFAULT GAS To change the Default Gas when the unit turns on go to the SETUP menu 4024 FANS lt screen and highlight Default Gas Then a short push of both left and right buttons to select Fig 3 17 The gas can now be set On this screen you can also input the cylinder size VOL 40 CUFT El DANGER It is important that the correct cylinder size is entered for S2 EXPLORER to correctly calculate the remaining resource times Fig 3 17 The Default Gas information is used to drive bailout gas calculation using cylinder size and hence gas time remaining During the Pre Dive Se quence the Explorer performs gas analysis checks If the gas
31. will naturally collect in the exhale hose on the diver s right This will be accompanied by a gurgling noise Water is allowed to then move into the top of the exhale counterlung This 95 is acceptable for the following reasons 1 Water entering the counterlung is forced out again by the LCV system 2 A small amount of water will not affect the CO absorbent performance Moving water into the water removal system allows you to purge the water through the LCV To move water into the LCV system Close the mouthpiece put the hos es above your head and shake the hose squeezing the exhale hose like squeezing an accordion will move water down the hose quickly Now return to the loop and keep breathing normally lf water continues to enter the loop attempt to locate the leak and fix it A common leak point might be a mouthpiece that is not fully open or closed or a rubber mouthpiece which has not been properly secured to the BOV lf water is in the inhale hose again close the mouthpiece and move the water across to the exhale hose and evacuate as above BAILOUT AND ASCENTS Open circuit bailouts become necessary if a loop is unbreathable high CO or low high PO or flooded In the unbreathable scenario the loop will need to vent during the ascent This is done automatically by the OPV and the LCV combined I WARNING Ascents must be practiced on the training course while on open circuit and with a loop full of gas
32. 0 ft dives can be conducted using only this available gas as a bailout providing that the gas endurance alarms are not exceeded on the unit El NOTE Certain training agencies may required additional gas supplies for diving in mixed teams open circuit closed circuit Please check with your agency for details The following is offered as a guide when configuring the EXPLORER for a range of diving conditions This must be used in conjunction with the recommendations from your Hollis approved training agency Less than 18m 60ft 5 200 bar 2940 psi Not required 1000 1 40 cuft Nitrox 32 to 40 gt 19m 63ft to 5 200 bar 2940 psi Air to 40 nitrox of 40m 130ft 1000 1 40 cuft Nitrox sufficient volume for an 32 to 40 ascent from depth with a 150 5 3 cuft reserve at the surface after an open circuit ascent Bailout gas volumes should be calculated based on the depth of the dive and the ascent gas requirements Cylinders can be positioned on D ring attachment points on the harness or optional EXPLORER BCD Your Instructor and Training Agency will detail how to calculate for suffi cient bailout gas volumes COUNTERLUNG VOLUME The volume of gas in the counterlungs will affect the breathing feel of the unit Too little gas will make inhaling difficult and too much will make exhaling difficult All retreaters have optimal positions in the water where they have a better or worse breathing feel due the hydros
33. 9 SECONDS fim 8 ox 36 CHECK BAILOUT AND BCD At the end of a successful Pre dive sequence you will see the check resources screen Fig 4 5 At this point you should cycle through the screens by pressing the left or right button to check that all resources are adequate to com plete the dive After a few seconds the display will time out to the Dive screen Fig 4 6 PRE DIVE PRIMARY ERROR MESSAGES The following are possible error messages that may occur during the Pre Dive Sequence and their meanings Message Meaning The batteries in the EXPLORER must be charged prior to diving MENU DCP STAT Fig 4 6 O sensor s unable to calibrate and must be replaced and or their connectors cleaned CO sensor is unable to calibrate and must be replaced or removed the 5 minute pre breather system will be activated 89 90 Message Meaning O sensor s unable to calibrate or failed LSS Sensor Module Recharge unit and try again Return to dealer if problem persists Negative test failed Ensure Cyl inder is attached Ensure Mouth piece is fully in OC mode Fill loop until vent valves exhausts then attempt negative test again If HP reduces by gt 50bar 735 psi or does not reduce by at least 5bar 73 5 psi Make sure cylinder valve is fully open Check cylinder size is correct in DEFAULT GAS Menu Do not use unlisted cylinders Submerge unit and look for LP HP leaks BC inflato
34. CO scrubber Resources are generally expressed in minutes and are noted in the cen ter of the dive screen Fig 3 20 The controlling most critical resource is shown This can change throughout the dive and another resource may take its place Alarms will be activated when resources reach certain levels as defined in the Alarm Tables In addition should a resource alarm be triggered for any reason the STA TUS screen will appear This will not only note the resource level but can also tell the user of the direct action required i e ASCEND NOW min Fig 3 20 37 OXYGEN SENSOR CALIBRATION The EXPLORER is able to perform accurate calibration of the Oxygen PPO sensors in ambient air This has particular importance on the ease and accuracy of achieving calibrated sensors The EXPLORER is able to measure atmospheric pressure during calibra tion and make the appropriate calibration adjustments for the sensors When performing sensor calibrations it is important that the calibration gas and ambient pressure are known By using ambient air as the calibration gas this is known accurately Calibration Errors When Oxygen sensors are new or completely dry anda calibration is undertaken a small difference will be not ed when another calibration is done after a dive This is because the humidity inside a unit post dive affects the sensor membranes permeability to a small safe degree In general it is good practice to
35. Control If 2 or 3 cells in state OK and PPO lt 0 20 bar V High Control If 2 or 3 cells in state OK and PPO 0 70bar where PPO PPO setpoint i e the difference between the average PPO2 and the setpoint The average PPO is based on the calibrated value from all cells in alarm state OK 66 SURFACE HUD BUD ALARMS Red Do Not Dive Alarms Dive Hours Remaining 0 Depth Senso No Commsor Stal No Commsor Stal Ascent Rate Commsor Stal me E ee Bee Very High gt 10mbar ay py PPCO No Comms Sensor Stale or Failure Failed Cal PPO Low Very High No Comms Stale High Span or Bad Cells i TRE a Fai ee Fail _ o Interface Mismatch or Missing LSS module LSS IIC Comms Cell 1 Bad or Cell 2 Bad or PPO Cell Cell 3 Bad one only vve No Comms or Stale Very High Not diving and CNS 2100 Loss of LSS module comms in the handse o pierre Battery No Comms or Stal Empty either LSS module or handset battery gt Charge lt 10 Charging and Empty either LSS module or handset battery Charge lt 10 No Comms or a Solonoid Valve Pressure Difference OK v PPO Bad Cell States e Cell input timed out e Cell input stale e Calibrated sensor input gt 3 00 bar e Calibrated sensor input lt 0 15 bar e Raw sensor input lt 7 mV e Cell input
36. DIVE as in the above example unless there is another fault to report Fig 3 1 po SERVICE MODE Service mode is accessed in the Setup Menu With this mode activated each pre dive screen shows additional text infor mation relevant to the test being performed Also it enables an extra blue STAT button on the Startup screen Fig 3 2 which if selected with a long push of both buttons not indicated will allow access to detailed service sub screens Your Hollis dealer will use information on these screens to assist with any servicing required A short push of STAT will display the STATUS screen and relevant resources as during a dive To enable fault diagnosis put the EXPLORER into Service Mode Having selected STAT with a long hold of both buttons from the Startup screen you will access two extra screens Fig 3 3 3 4 plus alarm and metric screens not shown During Pre dive additional information will be displayed on each Pre dive screen such as the PO and internal loop pressure Fig 3 5 STATUS SCREEN COLORS There are four color states of the STATUS screen Each color provides additional information The four color states are Green No problem with the information Yellow The system is informing you of a low level alarm such as low HP gas supply The STATUS Screen s Action Panel will give information regarding the warning or action to be taken and in the case of the low HP gas example the value in t
37. ER Stay on EX PLORER and ascend Stay on EX PLORER and ascend Ascend on open circuit Stay on EX PLORER and ascend Stay on EX PLORER and ascend Ascend on open circuit Onboard 3 sensor driven Onboard 3 sensor driven PO Onboard 3 sensor driven PO 71 GAS RESERVES DYNAMIC RESERVE The EXPLORER monitors the high pressure HP contents of the onboard gas supplies The EXPLORER includes two warning system for the HP contents 1 Pressure below reserve level 2 Rate of use of gas is too high or too low indicating either a leak or that the HP cylinder valve is turned off and gas injection is being unsuccessfully attempted The gas supply reserve level is dynamically adjusted based on depth because ascent times vary with depth and assumes a stressed breathing rate of 20 I min on open circuit bailout using the onboard cylinder If the system sees this reserve limit approaching it will warn the diver to ascend BAILOUT TO OPEN CIRCUIT Should the operation of the EXPLORER generate an emergency alarm red HUD LED and vibrating HUD then the diver must bailout to open circuit on either the in board supply above 18 m 60 ft or the off board supply below 18 m 60 ft El NOTE Decompression calculations for the ascent profile will assume air as a breathing gas to provide additional safety during a bailout ascent 7a MOD MAXIMUM OPERATING DEPTH The EXPLORER will warn on the main disp
38. ING The CO Absorbent Scrubber Alarm consists of a Filter reading of 0 minutes blue green HUD warning and an ascent warn ing It will activate when there is sufficient duration to allow an as cent to the surface At such time the diver should imediately end the dive and safely ascend to the surface on the breathing loop E DANGER If in doubt of the condition of the CO scrubber replace the absorbent and perform full pre dive checks Filter scrubber time remaining must exceed the planned dive time 47 48 OPERATION AND INTERACTION OF TEMPERATURE PROFILER AND NITROX INJECTION METER The thermistor bar chart of the temperature profile through the scrubber is shown to give the diver information on the activity of absorbent inside the scrubber This should have a peak when the scrubber is being breathed on From cold it will take about 5 minutes for the CO reac tion to cause a visible spike This spike should then continue and grow higher The temperature bars fill from the left to the right as the scrubber is being used This screen is in the Pre dive sequence If there is no peak then there is a problem with the scrubber This could be caused by 1 Flooded scrubber 2 Scrubber pack not installed 3 Scrubber pack empty 4 Scrubber material exhausted or gone bad During pre breathe the unit needs to be breathed on to see a change in the thermal profile This does not guarantee correct operation but has a high likeliho
39. IT Fig 3 7 NDL PLANNER O390Ft 100Ft 110ft SI 00 hours 29min 23min O1 min DCP 50 l gt Fig 3 8 PC LINK MODE Fig 3 9 LOG BOOK AX DEPTH 120ft SURATION 30min IME Thu Oct 25 15 37 23 2012 IX 36 mite 1P USE 600psi Fig 3 10 ABOUT This screen shows information about the software installed in the EXPLOR ER the serial number of each connected element and information that may be required by your service center Software updates for the EXPLOR ER are available from http hollis com support asp Please check regu larly for updates Once a new update has been installed this screen will report the new version of software installed Fig 3 17 TURN OFF This selection shuts down the Explorer electronics 4andset Ver 4 0C SIN 01234567894BCDEF0O122 sensor Module Fig 3 11 31 SETUP MENU MAIN MENU SCREEN FIG 3 72 The EXPLORER has a simple menu system which is available while at the surface To access the Main Menu short press any button MENU NAVIGATION Action Button Press To Make A Change Short push both buttons enter the modification screen Exit The Menu Long push both buttons Scroll Down Short push right button Scroll Up short push left button SETUP MENU OPTIONS UNITS This option allows for the switching between metric and imperial unit modes LOGGING INTERVAL This option allows for the selection of how frequently 1s
40. IVE SCREENS In the Main Dive screen Fig 3 26 the CO reading is found by access ing the STATUS screen by a double press of the right button Then scroll through the screens to see CO Fig 3 26 58 Scrolling through the screens to the CO display will now display the CO reading in Millibars in the central window Fig 3 27 CE TESTING OF CO SENSOR Gaseous CO sensor module Tests conducted at ANSTI test systems As can be seen from the graph below the CO sensor readings keep in close correlation with the ANSTI Teledyne Lab CO analyzer The Blue trace is the ANSTI detector The CO sensor is represented in pink The quick occasional changes to the Blue ANSTI trace are calibration tests to ensure accuracy of the measured readings 10 i 00 05 4690 oo 00 15 050 O 3 gt o al w Pa 8 oos7 100 x 0 0 i iy 5 g5 0 0 0 0 0 0 0 0 0 o AS Se o gt 2 8S 3 3 s 0007150 0001300 0008210 0010 020 0011430 oo1s240 000 a It can be seen from the graph that after 60 minutes there is less correlation between the in loop and ANSTI readings This is due to the rapid ascent rate pressure change causing a temporary temperature drop The CO sensor will quickly recover from the temperature drop To a lesser extent there is also the reverse condition at the beginning of the dive where the chamber is being pressurized and the temperature is rising Within a few
41. MDL PLAN El DANGER The ESS should never be used as a routine diving start PC LINK up system A full Pre dive check MUST always be conducted to Kolei 1010 4 ensure safe operation The ESS is designed ONLY as a safe guard ABOUT If you have not completed pre dive checks abort the dive and per Wt form a proper pre dive on the surface g Fig 4 8 TURNING OFF The EXPLORER cannot inadvertently turn off while submerged Although while at the surface if no button pushes are detected within 15 minutes it will automatically turn off to save power Fig 4 7 To manually turn off EXPLORER then select the Menu option and do a long press of the left button OFF Fig 4 8 MENU LESS THAN 2 HOUR PRE DIVE SEQUENCE Fig 4 9 If you have completed a sucessful Pre dive Sequence within the last 2 hours then upon reactivating the unit assuming there is nothing wrong with the system it will display the Hollis splash screen followed by two screens Fig 4 9 4 10 It will then allow you to dive immediately Fig 4 10 ga POST DIVE DAILY MAINTENANCE POST DIVE During a diving sequence it is important that a small amount of daily main tenance is undertaken These fall into 5 categories 1 Care of oxygen and CO sensors 2 Loop cleaning 3 Recharging 4 Cylinder filling 5 Absorbent changing 6 BCD CARE OF OXYGEN AND CO SENSORS The Sensor Module SM is easily removed from the unit by removing the Life Su
42. Most screen commands soft buttons are actually the written word in English but movement commands are expressed using icons Moves the cursor to the next field to the right to edit or moves the STATUS display one window to the right Moves the cursor to the next field to the left to edit or moves the STATUS display one window to the left r A single bracket indicates a short push of the button to perform the action in this case move left form the action in this case move to left 7 Moves the cursor up to the next option as in a menu list In this case a short push of the left button A down arrow moves the cursor down A short push increments the information by 1 digit A long push increments the information in multiples A minus sign decrements the digit EXITS to the previous page and SAVES the information ENTERS the selected item page Two sets of brackets around a function indicates a long push of both buttons In this case to exit the page 26 SCREEN ICONS During the Pre dive tests icons appear across the top of the screen start ing on the left As each level of Pre dive is completed successfully a green icon appears indicating the test has passed successfully Note that all icon colors as with any numerical displays match the alarm severity yellow indicates a low level alarm and coincides with a blue green HUD BUD state In addition a grey icon indic
43. N TURN ON RULES The EXPLORER will turn on if the loop PPO drops to 0 17bar Therefore even with the unit incorrectly assembled gas not turned on the system will detect the fall in PPO and will activate It will then alarm and require the user to properly complete the pre dive sequence Once turned on the LSS unit will attempt to maintain a breathable PPO based on the DCP Dive Control Parameter setting and the supply gas expected If sensors are removed or read 0 00 then the unit will only turn on with depth or by the user pressing a switch This feature is included to conserve battery power when the user takes out O sensors for storage or during transport Other errors such as failing to turn on cylinders etc are much more likely and should be reduced by proper training and the intelligent alarm systems as in the EXPLORER If the diver does not have HP gas turned on alarms on the HUD BUD and Wrist display will occur as soon as auto turn on occurs Hence this method provides increased warnings whenever the loop is breathed on with the unit turned off Breathing the loop in all circumstances where the unit is breathable and PPO sensors operative will trigger an automatic turn on fl DANGER The additional safety features described in this section should NEVER be used as routine The user should ALWAYS turn on the unit and complete pre dive checks as required in training and the operations manual 25 DISPLAY SYMBOLS
44. P and breathing loop fittings hoses while submerged be tween the surface and 6 m 20 ft Look for incorect ly configured or stowed equipment Ensure proper weighting should be neutral with full counterlungs Emphasis should be placed on good trim Carry and use of additional bailout gas Carry external bailout gas cylinder on dives deeper than 18 m 60 ft Practice use of the BOV and external bailout Perform static and dynamic open circuit bailout drill Include at least 2 OC ascents from bottom the bottom to approximately 6 m 20 ft To verify bailout systems function To ensure the diver is correctly weighted to maintain depth control under all urgent emergen cy conditions To reinforce how to deal with a hyper Capnia situation and reinforce involved muscle memory The unit should be weighted to offset the buoyant volume of the EXPLORE Additional weight is needed to com pensate for their exposure suits and additional bailout cylinder Switch to off board open circuit via the BOV Ascend slowly The biggest buoyancy change is in the last 10 m 33 ft and ideally the student should remain horizontal within this depth range Weighting should be such that automatic venting should control the ascent This skill should be conducted twice 1st along a contoured bottom or shot line the 2nd time with an SMB 99 Using the wrist display adjust
45. R has any available updates and to obtain the reprogramming software then please go to http hollis com support asp El DANGER After new software is installed you MUST recalibrate the oxygen and CO sensors 76 GETTING READY TO DIVE GEAR PREP WEIGHTING As the counterlungs inflate the diver may experience movement in the EXPLORER This is minimized by tightening the harness or adding trim weights to the pocket available on the top of the case A weight of up to 2 3 kg 4 4 6 6lbs can be used If the EXPLORER is allowed to move on the divers back a change in breathing resistance may be noted With the Explorer s back mounted counterlungs it is important that the Explorer is as close to the diver s back as possible Your instructor will teach you how to weight yourself correctly WARNING Over weighting is dangerous With an empty BCD no additional bailout cylinder and 50 bar 735 PSI in the main cylinder you should be able to begin slowly to submerge in a controlled fashion by exhaling slightly too much and the ADV will add gas WARNING It is important to perform weight checks in confined shallow water with at least 50 bar 735 psi bailout gas prior to any open water diving HARNESS BCD POSITIONING When adjusting the harness try and imagine that the center of the count er lungs should be within 100 mm 4 inches of the tip of your sternum to give an optimum breathing performance While the BCD harness must be c
46. S module comm in the handset 69 PPO Blue Green Do Not Dive alarm states are High If 2 or 3 cells in state OK and average PPO 1 6 bar V High Control If 2 or 3 cells in state OK and provide complete and PPO 0 70 bar V Low Control If 2 or 3 cells in state OK and predive complete and PPO lt 0 20 bar where PPO PPO setpoint i e the difference between the average PPO and the setpoint The average PPO is based on the calibrated value from all cells in alarm state OK 70 PRIMARY ELECTRONIC BAILOUT SCENARIO CHART None Bad sensor Bad sensor readings error greater than 0 5 PPO PPO ex ceeds safe limits or mul tiple sensor errors Wireless HP data loss Very High CO gt 10 mb System OK Usable Green Y loop Usable Blue Y Fail loop Green safe mode Usable Blue Y Fail loop Green safe mode Usable Y depen loop dant on DCP PO Usable Blue Y STATUS screen action loop Green panel will show AS CEND NOW HP panel will be in Magenta No Comms Usable Blue STATUS screen action loop Green panel will show AS Unus Y depen dant on DCP PO STATUS screen action panel will show AS CEND NOW STATUS screen action panel will show AS CEND NOW PO panel will be in Magenta No Comms BAILOUT CEND NOW able loop see Alarm Tables for lower priority alarms BAILOUT None Stay on EXPLOR
47. TO MODE eeu nm Try Pw D rt sh best compromise between maximum NDL time and minimum gas usage Fig 3 19 At the start of the dive the DCP will automatically set high to increase the NDL time but then as the diver ascends and the NDL natural ly increases the DCP will start to automatically reduce to save gas while maintaining a long NDL gt 1 hr While shallow less than 10 m the DCP will remain at its current value This defaults to 50 each time the unit is MODE switched on The first time the dive exceeds 10 m depth the DCP will auto 7 matically be set high to increase the NDL time Then as the diver ascends and the NDL time naturally increases the DCP will start to automatically reduce to save gas while maintaining a long NDL gt 1 hr AUTO mode automatically adjusts the DCP throughout the dive to give the 0 Ft Fig 3 19 El NOTE Auto Mode is the default If on a dive where Manual Mode has been selected and you then surface and complete the dive Auto Mode will be the default at the start of the next dive 35 HOW AUTO MODE WORKS By setting Auto DCP prior to diving the following events occur 1 The DCP will automatically be set to 95 for the first 10 minutes of the dive but only after the diver exceeds 10 m of depth 2 If the NDL is then less than 60 minutes the DCP will stay set to 95 to maximize the NDL 3 If at any point on the ascent the NDL is in excess of 60 minutes then the DCP wi
48. The view from a Hollis rebreather into the underwater realm is like a view from no other place on earth Hollis Gear promises to deliver an experience like no other In 2000 Hollis parent company American Underwater Products under two separate contracts with the United States Naval surface Warfare Command developed and delivered a unit called the ATUBA Advanced Tactical Underwater Breathing Apparatus That led to the develooment and success of the Prism 2 eCCR technical rebreather All of that experience has been leveraged to bring you something new the Hollis Explorer eSCR the world s first electronically controlled semi closed rebreather for recreational divers AMERICAN UNDERWATER PRODUCTS ENVIRONMENTAL QUALITY POLICY American Underwater Products is committed to the preservation of our oceans and supports outreach and awareness programs that develop an understanding of the oceans importance to life on earth the fragility of marine ecosystems the damage done by pollution and the threat of overfishing We produce innovative products of the highest quality manufactured in an environmentally sustainable manner that meets or exceeds our customer s expectations and regulatory requirements JOLLIS HOLLISGEAR COM
49. VERSAL DISPLAY The Intelligent HUD Heads Up Display is attached to the BOV in the divers line of sight There is also a BUD Buddy Universal Display in the EXPLORER LSS Module for Dive Buddy Instructor use These displays give full alarm status at all times using a visual and a tactile alarm system SENSORS The EXPLORER uses 3 oxygen sensors and a wireless HP sensor It can also be equipped with an optional gaseous CO sensor All sensors are automatically calibrated by the electronic control system UNPACKING YOUR NEW EXPLORER BATTERIES The EXPLORER uses Lithium Polymer batteries These rechargeable bat teries are very efficient and provide many years of reliable operation Rechargeable Lithium batteries can be recharged at any time and do not have a significant memory affect which would otherwise cause unreliable battery operation The batteries are UL listed flight safe and are double sealed to reduce the chance of leakage to a minimum As extra confidence the LSS Module battery pack includes 3 separate batteries to ensure operation even under multiple battery failure scenarios During diving the battery reserve alarm will indicate when there is still suf ficient battery to allow a return to the surface with a small reserve The LSS MUST then be charged prior to diving again The handset has its own battery which is automatically charged from the EXPLORER LSS module The user should keep the batteries fully charg
50. aining and discipline to ensure the sub systems in the EXPLORER are operating correctly Critical components and potential failures are e The scrubber seal around the scrubber e A poorly packed standard pack only scrubber e Used or out of date scrubber material The scrubber should always be kept sealed until required for use Once installed the scrubber should be changed within 24 hours even if it has not been fully used through breathing When installed and being un used the EXPLORER should have its breathing loop closed so that ex ternal air does not accelerate the degradation of the scrubber However once open and used even if only a little the scrubber will continue to degrade andchange its characteristics post dive Therefore as previously stated the scrubber should always be changed within 24 hours of opening and or use Partially used scrubbers should be stored in the EXPLORER with a closed breathing loop Although the algorithm that analyzes the thermistor curve is adequately accurate during diving if the scrubber is not being breathed on the therm istors curve will be abnormal It also takes time for the absorbent to rise to normal operating temperatures Therefore for routine use the addition of the nitrox injection meter described in the next subsection is used to report the filter scrubber percentage remaining to the user NITROX INJECTION METER The CO created by the diver is in direct proportion to the
51. analyzed does not match the programmed default gas but is still usable within 5 you can simply start the dive without having to change the Default Gas setting If the gas analyzed does not match the programmed default gas the user will be brought back to the begining of start up and required to change the Default Gas setting If the Explorer s gas analysis seems incorrect you should re analyze the gas and or check the oxygen sensor calibration BAILOUT GAS It is not necessary to set a bailout gas Whether the bailout is undertaken on the onboard attached gas or on an external gas supply the EXPLOR ER assumes 21 oxygen and 79 nitrogen as the bailout gas This is to ensure as safe an ascent as possible in an emergency All bailout tissue compartment calculations are based on 21 oxygen and 79 nitrogen 34 DCP DIVE CONTROL PARAMETER DYNAMIC PO The EXPLORER is a dynamic PO controller This means it can vary the PO that it maintains based on the value of certain resources A higher DCP Dive Control Parameter value means less tissue loading higher PO but more gas usage and a lower PO is the opposite For a set DCP the actual PO will vary throughout the dive profile The DCP can be set to AUTO or MANUAL mode O Q MANUAL DCP MANUAL MODE In manual mode the diver can set the DCP using the screen shown Fig s Q 3 18 A long hold of either the or button will jump the DCP value by 10 m OD E AU
52. aphics or instructions There is sig nificant background analysis that produces a warning system sensitive to changes in expected levels but intelligent enough to not overload the diver with information and situations that may be routine during a dive These electronic alarms combined with varying levels of mechanical user controls ensure safe operation of the Explorer in all conditions Example e PPO changes that may normally cause PPO alarms to be triggered are inhibited if they are of the correct characteristic expected during a descent or setpoint change false warnings THE HEADS UP DISPLAY The Heads Up Display HUD is an ergonomic addition for the diver as it gives a simplified and quick to follow view of the status of the EXPLORER The HUD has 3 main warning levels e Flashing Red plus vibration alarm warning is activated when a dive should be aborted on open circuit or not started e If diving the diver should switch to the bailout gas e The HUD vibration alarm will vibrate every second for 5 seconds then ag repeat the 5 second alarm every 30 seconds or if the source of the alarm changes e Flashing Green and Blue lightss warning is activated when a man ageable error situation is in place Refer to the wrist display and take the indicated action If the issue can not be immediately remedied the correct response is to ascend slowly on the breathing loop while monitoring the wrist display for escalating risk
53. ates a test not yet performed WARNING A red icon means a failure of the test alarm which if ignored would make EXPLORER unsafe to dive The icons are Battery amp Computer O Sensors Breathing CO Removal HP Gas HP Gas Loop Ae Content Analysis S 27 28 DIVE SCREENS Sereen Description Q Q Dive Time Q MENU DCP STAT Qs AUTO DCP fh Arr N MODE O On MANUAL DCP 3 7 fi fi i i O E MODE y Dive Screen when ascent rate bar is 1 2 full then rate is 30 ft min 10 m min Dive Screen with menu bar accessed by a single push of any button Status Screen accessed by a short double push of the right button DCP Auto Mode short push of both buttons to change modes DCP Manual Mode short push both buttons to change modes 1 increment change by short push of either button 10 increment change by long push of either button STATUS SCREENS The Status STAT screens show all key resources in a simple format The screen is accessed from the main screen by a short double push of the right button and then a short push of either the left or the right button moves around the screen The Status screen also incorporates a color coded Action Panel to give instructions The items that can be displayed are Screen Description _ RATTERY Battery time in minutes CNS oxygen toxicity time in min utes PPCO Partial pressure
54. ation at the start of a dive sequence and if the sequence is longer than 1 week at the start of each new dive week When having not been used for over a month or if you suspect a bad reading see additional notes on filter care a calibration must be done prior to diving It is good practice for the user to check the approximate validity of the CO readings regularly ideally prior to any dive Simple testing by breathing directly onto the sensor should see the reading rise within approximately 1 minute Also exposure to clean fresh outside air should give a reading in the order of 0 4 mB The unit will respond faster with the filter removed So the user must familiarize themselves with the operation and assembly of the system to be confident the device is work ing correctly Consult your Hollis dealer if in doubt Ii WARNING If you wish to calibrate the CO sensor you must en sure you are in fresh ventilated outside air DO NOT calibrate in a closed room The calibration method is discussed above and is detailed step by step in the pre dive sequence ELECTRICAL CONNECTION The connector for the CO sensor is imbedded into the Sensor Module next to the 3 x O sensors Fl NOTE If moisture is present when this connection is mated then contact corrosion may occur This may give false readings on the CO sensor It is vital this connection is kept clean hollis approved contact cleaner or white vinegar and a soft brush can be used to achiev
55. ation is also dependent on how much loop venting mask clearing BCD drysuit inflation occurs Fl NOTE In Europe cylinder valves for use with the EXPLORER must be certified in accordance with EN12021 81 32 CO ABSORBENT SCRUBBER PACK THE ABSORBENT SCRUBBER PACK The unit has been tested under CE requirements for CO absorbent scrub ber duration The weight of absorbent in the scrubber pack is approximate ly 1 5kg 3 3lbs Tests were conducted with using the user packed canister and Molecular Products 797 Grade CO Absorbent WARNING Using any other absorbent will change and possibly reduce the Canister duration and could lead to injury or even death I WARNING At the time of this writing all figures were tested using the user packed version of the scrubber canister Please see all relevent documentation in regards to use and duration times for the pre packed scrubber As they may slightly differ Test results will be released once the pre pack scrubbers our available for sale CANISTER DURATION At 40m 130ft of depth with Nitrox 32 as a diluent at 4 C 39 F water tem perature with a CO injection rate of 1 6 I min and a ventilation breathing rate of 40 l min and a 1 5 kg 3 3 lbs absorbent load of a Hollis Approved absorbent See Unit Specification the unit will last 40 minutes at 40 m 130 ft as an extreme test Ref EN14143 2003 This duration changes significantly with higher temperatures and low er work ra
56. ature profile duration meter 2 An Nitrox Injection Meter based on CE tested durations 3 An optional gaseous CO sensor accessory The readings from all of these devices together can be used to report a high confidence status regarding the state of the Scrubber However user experience and training should also be used to determine the validity of the readings given Scrubbers are a key element of a rebreather Great care should be taken when determining if a dive can be safely performed with the scrubber in its current state Flooding extended storage between uses improper assembly and improper packing can all contribute to the canister duration meter reporting false readings Use great care in assembling the Explorer and in completing pre breathe checks on the breathing loop The CDM is a useful feature as an aid to predicting absorbent duration IH WARNING NEVER dive a partially used Scrubber beyond 24 hours of its initial packing or opening irrespective of the CDM meter read ing This includes partially used scrubbers that have been stored in a sealed loop or container TPM TEMPERATURE PROFILE MONITOR This meter relies upon the heat producing reaction of the CO absorbent Utilizing multiple temperature sensors the system detects a complex reac tion heat wave front through the absorbent as it is being used The duration of the Scrubber depends mainly on the amount of CO being produced by the diver and the depth of the dive
57. ble end con D A I I CE nector until the key way aligns Then push it in and tighten the black lock ring clockwise Fig 2 8 The lock ring will spin freely once the connector is fully assembled Once connected and power is applied a red light will appear on the LSS module When charging a Red light appears on the LSS Module It turns Green when the LSS Module if fully charged A full charge takes approximately 10 Fig 2 9 hours Si pv EXPLORER has 3 battery status displays with the charger connected D B I ji H 1 Battery Charging Empty Fig 2 9 2 Battery Charging Fig 2 10 3 Battery Charged Fig 2 11 To remove the optocon charger unscrew the ring which will rotate freely until pulled back to start the thread and pull out the connector Reinstall the Optocon charging download connector protection cap Fig 2 10 El NOTE To avoid damage the Optocon charging download con F M T T z p ws nector protection cap must be installed before submerging your ir Explorer Step 8 Once the LSS Module is charged it may be installed on the inha lation side of the Explorer canister First inspect the O rings and sealing surfaces to ensure they are in good condition The Explorer case has two notches on either side of the canister opening Align the locking ring tab with the notch on the left side when the Explorer case is laying on the harness side Additionally line up the solenoid as shown Fig 2 12 Then while p
58. cal assembly where the CO absorbent is housed ADV automatic diluent valve a valve that automatically adds fresh gas supply to the counter lungs as it collapses from increased pressure of depth or if it is needed after venting too much gas as in a mask clearing exercise Bailout redundant gas supply system Balance Tube The tube between the exhale counterlung and the LCV This tube removes water from the counterlung and controls breathing loop pressure with the LCV BUD Buddy Universal Display Universal display on side of LSS module codes identical to HUD BCD Buoyancy Control Device the harness buoyancy compensator assembly BOV bail out valve Breakthrough where absorbent scrubber fails no longer removing CO at an adequate rate Breathing Hose The large hoses that connect the Canister assembly to the BOV Breathing Loop parts of the rebreather that breathing gas circulates within Canister Mechanical assembly where the Absorbent Scrubber Pack is housed Caustic Cocktail very alkaline liquid water mixed with CO absorbent material CCR CC closed circuit rebreather CO carbon dioxide Diluent a gas used for breathing volume and to reduce the fraction of oxygen in the Breathing Loop Dive Control Parameter DCP The control to define how high the oxygen level is set for the dive profile Exhale Counterlung The counterlung positioned behind the diver s right shoulder FO fraction of oxygen Graphical User Int
59. calibrate a unit in an as dived state i e with humidity in the loop This is per formed naturally during the Pre Dive Check sequence The EXPLORER uses advanced empirical techniques to ensure the accura cy of the ambient air calibration I WARNING When refitting an oxygen sensor or after calibration of the sensors a full Pre Dive sequence MUST be completed The user can cause the largest error in oxygen sensor calibration If the calibration is not done in ambient air the sensors will not give the correct readings after calibration Therefore do not execute a manual calibration without ensuring the sensors are exposed to air at ambient pressure The units testing for good and bad oxygen sensor calibration is deter mined from the sensor mV level detected during calibration At 1000mBar atmospheric pressure the range the unit can calibrate for is approximately 5mV to 15mV However if a sensor that would normally show 7 5 mV in air has an enriched gas 40 Oxygen applied to it during calibration then the sensor will give 14 28 mV The calibration will pass but the sensor readings will be dangerously inaccurate 38 Recommendations e Never store sensors for long periods of time before use they have expiration dates e Never subject sensors to high temperatures i e inside cars garages etc e Never freeze sensors left in cars overnight e Never subject sensors to physical shocks e Never subject sensors to vacuum e
60. can replace damaged meshes Fig 2 26 Fig 2 27 17 e Place the Dust Filter inside at the base of the scrubber canister Fig 2 28 It should lay smoothly against the metal screen bottom with the tabs along the radial edge folded upwards Ensure that the tabs lay smoothly against the inner walls of the scrubber canister Fl NOTE The Dust Filter must be replaced if it begins to show signs of deterioration or becomes torn e Fill with CO absorbent as per later PART 4 Section 2 in this manual and refit the top nut and spring Fig 2 28 ABSORBENT SCRUBBER PACK QUAD RING fl DANGER This is an extremely important seal in the system and should be regularly cleaned and inspected It is vital in preventing CO bypass e If you are using the single use pre packed CO scrubber then each scrubber pack comes with a new quad ring seal El DANGER The quad ring is not a standard O ring It must not be replaced with anything else e If you are using the standard scrubber pack this seal must be visually in spected before every dive and replaced at the first sign of wear or damage El DANGER The standard CO scrubber pack quad ring seal must be replaced at the first sign of wear or damage COUNTERLUNG DISASSEMBLY ASSEMBLY e Remove the counterlungs by unscrewing the connectors e Remove the exhale counterlung LCV mushroom valve cap 1 2 turn counterclockwise to unlock e Sanitize and inspect the counterlun
61. d in the diagram No Comms Pressure Sensor alarm is No Comms Stale not updating as expected Pressure Sensor alarm is Stale Missed Stop Deco Ceiling violated for more than 1min This alarm state locks for 24 hours Too Shallow Deco Ceiling violated for lt 1min At Stop Within 0 1 bar deep of the next stop Near Stop Within 0 3 bar deep of the next stop Too Deep Greater than 0 3 bar deep of the next stop 63 IN WATER HUD BUD ALARMS Red OC Bailout Alarms Decompression U D O No VR IC Comms LSS IIC Comms ensor Boar Comms Predive U a a 2 Battery Pressure Difference OK v 64 Near Stop or Too Deep Missed Stop No Comms or Stal At Stop Too Shallow Sensor Failure Failed Ca No Comms or Stale _ ee Low lt 0 17bar Fait Fail nterface Mismatch or Missing LSS module Fait Initial Diving After No Prediv No Comms or Stale Loss of LSS module comms in the handse No Comms or Stale No Comms or Stale Very High gt 10mbaz Blue Green Alarms No Commsor Stale MOD Exceeded depth gt 40m or too deep for the measured Nitrox Depth Sensor No Commsor Stale Fast 20m min lt Depth Rate lt 10m mir or Very Fast Depth Rate lt
62. degrees to 3 O clock Fig 2 20 Fig 2 20 Fl NOTE Ensure the lock ring is in the 9 O clock position for the threads to engage then twist it by 180 degrees to 3 O clock to lock The Case Back Cover will not fit correctly if the lock ring is in the wrong position SENSOR MODULE DISASSEMBLY ASSEMBLY OXYGEN SENSOR MAINTENANCE TESTING e Remove the Sensor Module Fig 2 21 from the Canister e Remove all 3 oxygen sensors Fig 2 22 e Inspect the Thermal Profile Monitor TPM body and O ring for damage and clean the TPM with warm soapy water NEVER expose the sensors to water e Clean the sensor jack connectors with a soft cloth look for damage and corrosion El DANGER After sensor replacement you must ensure the unit is calibrated by completing a full pre dive sequence Hl DANGER It is important that oxygen sensors are maintained and cared for Avoid excessive moisture Some moisture will always form during a dive but if the rebreather has been flooded the sen Fig 2 22 sors MUST be replaced 15 OPTIONAL CO SENSOR TESTING DISASSEMBLY ASSEMBLY Having removed the Sensor Module carefully remove the CO sensor protection cap and the CO sensor Fig 2 23 Handle the CO sensor with care e Inspect the mini jack connector and carefully wipe clean with a soft cloth e Remove the yellow sponge inside the cap and allow it to dry Ei DANGER A moist all liquid wrung out pliant and supple sponge ne
63. display only Flashing Red amp Vibrating This code means there are no detected prob lems Warning It is activat ed when a manage able error situation is in place Loss of communica tion between sensors or modules It is usually associated with DO NOT dive or OC bailout but could just be a warning It is activated when there is an urgent issue OK Procede with dive as planned The correct response will be displayed on the STATUS screen and will often tell the diver to ascend slowly on closed circuit monitoring the wrist display Check the status message on the wrist display an act accord ingly DO NOT start the dive If already diving the diver should switch to the bailout gas and ascend El NOTE Red alarms take priority in the HUD over Green Blue alarms El NOTE Yellow on the wrist display is equivalent to the alternating blue green state of the HUD Il NOTE The HUD vibration alarm will vibrate every second for 5 seconds then repeat the 5 second alarm every 30 seconds or if the source of the alarm changes ALARM FLOW DIAGRAMS The following sections contain flow diagrams to indicate which actions HUD indication will be used separated into diving and surface cases The following flow charts should be used in sequence where an OK from the red HUD alerts lead to blue green HUD alerts Note the follow ing decompression tissue model O C Bail Out alarm states use
64. dive All divers must enter the water with enough gas in their BC to allow the diver to safely float on the surface The Pre Dive sequence must not be done sitting on the edge of a boat or pontoon It MUST be done when prompted with the nose blocked seated in a safe location and in a way they can easily read their dis plays Divers should carry a minimum 3 liter of bailout gas for dives deeper than 18 m 60 ft Safety decompression stops should be conducted on all dives 27 98 IN WATER SKILLS CHART Pre dive checks Accurately complete all checks without bypassing any items Calibration of Explorer Complete calibra tion of O amp CO sensors Diver checks them selves and buddy for leaks Diver maintains buoyancy and trim checks In water leak buoyancy and trim checks To confirm the EX PLORER has been prepared correctly the function of the absorbent and the monitoring system function To confirm calibra tion of all sensors on primary elec tronics with air CAL sequence To ensure no LP HP or breathing loop leaks are present that either were missed by Pre dive checks or occurred after checks Make buoyancy and trim adjustments Follow on screen sequence using the wrist display Explain sensor calibration rules in manual impor tance of sensor po sition date stamp logging system O sensor voting logic system and CO scrubber replace ment Check LP H
65. e must be fitted prior to every dive to ensure accurate CO readings e Dispose of sponges after 10 dives and install new e Refit the Sensor Module into the Canister El DANGER After sensor replacement into the sesor module you must ensure the unit is calibrated by completing a full pre dive sequence CANISTER END CAP DISASSEMBLY ASSEMBLY e Remove the Right Hand end cap by twisting the lock ring counter clock wise 1 2 turn e Inspect and clean the O ring and sealing surfaces Lubricate and refit the end cap sealing O rings Fig 2 24 e Refit the end cap by aligning the locking ring tab with the notch in the Explorer case on the left side while pushing the end cap into the canister Then turn the lock ring clockwise by 180 degrees to the opposite notch in the Explorer case Fig 2 24 El NOTE The Diver s Right Side End Cap contains the Go No Go Device This is the green stem in the picture Fig 2 24 surround ed by a spring Ei DANGER If you do not insert an absorbent scrubber pack the de vice greatly restricts breathing on the loop This is to force you off the breathing loop until the issue is remedied You must not dive without a CO scrubber pack fitted 16 CANISTER DISASSEMBLY ASSEMBLY e Remove the counterlungs and hoses by unscrewing the hose lock rings counterclockwise Clean and inspect the sealing face for each end cap seal hose ends and counterlung ports e Disconnect the LCV balance
66. e be conservative be safe Hl DANGER If you do not insert an absorbent scrubber pack the de vice greatly restricts breathing on the loop This is to force you off the breathing loop until the issue is remedied You must not dive without a CO scrubber pack fitted No matter how many safety monitoring systems are in place use your own common sense and discipline to ensure you do not push the life support systems beyond their designed limitations It is your life being Supported respect the equipment and its limitations CARBON DIOXIDE SENSING MODULE Premise The EXPLORER is designed with an option to fit a CO sensor The user can elect to buy this initially or upgrade to the sensor later The CO sensor gives many advantages as detailed below EXPLORERS not fitted with CO sensors or that have had their CO sensor temporarily removed by the user can still be dived but with no CO sen sor fitted a 5 minute pre breathe of the absorbent scrubber will be forced instead of a 1 minute pre breathe with the optional CO sensor installed El DANGER With no CO sensor fitted careful monitoring of scrubber duration is vital There is little confirmed data on actual absorbent durations typical for sport diving rebreather use Sports divers often push the absorbent duration be yond the published CE durations because they assume that they will not be creating as much CO as the CE trials or operate at the same tempera ture or depth
67. e operation of the CO sensor as fitted to the EXPLORER rebreather The EXPLORER CO sensor is the world s first commercially available car bon dioxide sensor proofed and designed by VR Technology for operation in a high humidity high oxygen rebreather breathing loops The CO sensor actively measures carbon dioxide while the user is breath ing on the loop It can thus warn of high CO levels before unconscious ness or other symptoms occur in time for the user to perform remedial tasks such as finishing a dive reducing activity or even bailing out to other gas sources BACKGROUND It should be noted that this is the first use of a CO sensor in an active user breathing loop As such new data on CO levels will be obtained that will identify areas of adjustment of common practice and improved use of the CO readings as time goes on Much of the research in CO poisoning has been conducted with military levels of exertion and requirements From this research the 5 to 10 mBar limits for CO were formalized as the upper working range for CO by a diver undergoing considerable exertion Thus the alarm levels within the EXPLORER have been initially set as 5mB and 10mB As the user moves into the 5 mB range although no symptoms may occur it is highly advis 51 a Fae able that the dive be terminated as soon as possible It is assumed that CO levels in the region of 15 20mB are potentially very dangerous and potentially fatal
68. e this Inspect this connection regularly 57 MECHANICAL FITTING The sensor should be fitted into the EXPLORER Sensor Module Check the O rings around the filter carrier are not damaged Ensure the O rings are lightly lubricated Ensure the foam material is clean moist dampened with water to soften and all liquid wrung out and not damaged The filter assembly should be periodically checked for water or mechanical damage It is advised to keep spare replacement foam filters The foam filter is the main protection for the sensor from the breathing loops general environment If damage occurs to the filter or it becomes exhausted then damage will result to the CO sensor itself So always keep in it good condition Hi NOTE After a days diving you can remove the Sensor Module from the rebreather and keep the Sensor Module and the sen sors in a dry environment air conditioning if possible until the next dive Removing the CO filter assembly to ventilate the CO sensor is also advised CALIBRATION SCREEN To access the CO feature for calibration go to the CO option in the Pre dive screens I WARNING The CO sensor MUST always be calibrated in fresh clean air outside preferably at sea level Select the CO option Fig 3 25 and EXPLORER will prompt you through the setup procedure and calibration will occur automatically Always check that the sensor reading after calibration reads approximately 0 4 0 1 mBar D
69. ealing ring that creates a positive seal on the CO canister Sensor Module Electro mechanical assembly where the oxygen sensors CO sensor and Thermal Profile Monitor are housed Setpoint The PO that Explorer supplies based on the DCP setting TPM Thermal profile Monitor The device that monitors the usage of the CO absor bent The Right Hand End Cap End cap that when removed gives access to the CO Scrub ber Pack WOB work of breathing cA NOTES 411 OUR HISTORY Bob Hollis had his first rebreather experiences in the mid 60 s He used Draeger units to allow him to get close to sea Otters and other marine life in Monterey Bay In 1970 Hollis made some of the first dives on the Electrolung rebreather using Heliox down to 300 feet in Honduras and Bonaire filming shipwrecks and deep reefs In 1990 Bob amp Oceanic developed the Phibian rebreather which at the time was the only commercially available unit HOLLIS REBREATHER DEALER SUPPORT COMMITMENT As a consumer you will receive a greater level of support from a Hollis Rebreather Dealer Not because a non Rebreather dealer doesn t care about support Instead the Hollis Rebreather Dealer has a greater level of commitment to the complete product line A Hollis Rebreather Dealer has perfected their diving skills and is at their peak of instruction They will provide access to rebreather training service consumables upgrades and travel
70. ed to ensure there is always maximum battery charge for any dive A fully charged battery pack will display 900 minutes of battery life on the wrist display See PART 3 Section 6 for directions on how to access the Battery Status Screen El DANGER The battery estimate is based on current temperature light usage on the handset DCP setting and other variables Changes in conditions i e cold water may shorten charge times Plan dives accordingly and always monitor the HUD and Wrist Dis plays for system operation status Fl NOTE The EXPLORER must be fully charged before its first use Always ensure the Optocon charge connector is dry before attach ing the charging connector Damage may result if this is not done Check that all parts of the charger are kept dry and only used indoors Battery level alarms will activate when the batteries get low and will be displayed on the Status screen I WARNING DO NOT dive with a battery level that is less than twice your expected dive time for the next dive Fl NOTE To avoid damage the Optocon charging download con nector protection cap must be installed before submerging your Explorer INITIAL ASSEMBLY INTRODUCTION Your Explorer is assembled and tested at the factory Some components are then removed to package the unit When you receive your Explorer the following components will need to be put together GENERAL NOTES ON ASSEMBLY 1 All O rings should be lightly lubricated
71. erface GUI The display system for communicating information to the diver Heads Up Display HUD the LED display positioned in front of the mask HP high pressure Inhale counterlung the counterlung positioned behind the diver s left shoulder IP intermediate pressure 109 LCV Port the port on the exhale counterlung that houses the exhale counterlung mushroom valve This port links to the LCV via a balance tube Life Support System LSS Module the diver s left hand electro mechanical assembly Loop Control Valve LCV the valve in the canister that controls the amount of exhaust gas exiting the rebreather and controls the breathing loop pressure LP low pressure Maximum operating depth MOD the maximum depth a given gas can be used safely Mushroom valve a flexible one way flapper valve that permits the gas to flow in a circular path through a rebreather Negative Pressure Check a test placing the Breathing Loop under a vacuum condition to check for leaks O oxygen OC open circuit Optocon The wireless transmission system used in Explorer to send data between the Oxygen Sensor Galvanic oxygen sensors LSS and Sensor Module OPV over pressure valve PCO Partial pressure of carbon dioxide PO Partial pressure of oxygen Positive Pressure Check a test that looks for leaks in the Breathing Loop when pressurized PPO PO partial pressure of oxygen QD quick disconnect Quad Ring a specially designed s
72. factors e Solid Green means there are no detected problems WARNING If any other light sequence or a no light scenario is experienced then the diver should refer to the wrist display for information and abort the dive I WARNING If no wrist display is seen the diver MUST switch to open circuit and ascend The LED states are configured for color blind as well as highly stressed div ers The positions of the LED s along with the flashing or solid state of the lights provide conditions that cannot be confused with one another PRE DIVE CHECKS With current technology not all aspects of the safety and working nature of the EXPLORER system can be performed or determined automatically Therefore when turning on the EXPLORER there are a series of pre dive checks that must be performed The EXPLORER gives guidance in per forming these checks These checks are displayed in sequence on the EXPLORER wrist display Some of these checks rely completely on the diver to perform them correctly i e Close open BOV Other tests can be performed by the electronics control system and the user needs to con firm that these are OK to dive with i e that the high pressure cylinder is adequately filled Information regarding the current status of EXPLORER and all available resources can be reviewed prior to conducting Pre Dive Checks using the STATUS screen 24 DATA LOGGING EXPLORER has a sophisticated data logging sy
73. gs COUNTERLUNG TESTING e Attach the BOV exhale side diver s right side of the mouthpiece to the exhale counterlung canister port e Block the LCV port cap hose by folding it on itself to cut off gas flow 18 e With the BOV in CC mode Fully inflate the counterlung Immerse and look for leaks e Repeat for inhale counterlung there is no LCV cap to cap off REGULATOR WIRELESS HP TRANSMITTER TESTING e Connect a diving cylinder e Turn on the wrist display and complete the pre dive sequence e During the Pre dive HP gas test sequence if the first stage transmitter battery is low a warning will appear Fig 2 29 or if low at the start or end of a yellow warning Fig 2 30 will appear Fig 2 29 Hl DANGER If you are in doubt as to the HP readings on EXPLORER you must check it by attaching a normal gauge and hose to the HP post PUTTING ASSEMBLIES TOGETHER e Fit the Sensor Module EXPLORER Module and Right Hand end cap along with a new absorbent scrubber pack e Fit the LP hose to the ADV e Fit the counterlungs and the LCV port cap to the exhale counterlung Fig 2 31 e Fit the hoses to the BOV e Fit the cylinder and the DIN wheel e Connect the LP hose to the BCD inflator COMPLETE EXPLORER TEST Follow the on screen pre dive sequence See PART 4 Section 2 If the unit fails the negative or HP leak test and the fault is not easily recognizable Follow these steps e Remove the LCV hose from the Cani
74. han via the HUD or STATUS screens Alarm Display The method by which an alarm state is passed to the user On the LSS module the HUD BUD and tactile alarm are used On the handset this is done via the GUI Graphical User Interface displays and the STATUS screen which also has an ACTION Panel reflecting the HUD and a message containing a single user action Some alarm displays vary depending on other system states such as other alarms or the dive status e g diving not diving ALARM CODES With the EXPLORER a key task has been to process the fault levels and error conditions to indicate the status of the rebreather Further the LED states are configured for color blind as well as highly stressed divers The position of the LED s coupled with the flashing or solid states provide conditions that cannot be confused with one another During stressful dive scenarios the position and status is quickly understood to speed up the desired response correction by the diver The status sceens on the wrist display add one more level of security by adding extra information on an alarm states WARNING This information is in English and all users should be adequately trained in interpreting this information appropriately continued 61 62 There are 3 main warning levels associated with the HUD BUD and on screen displays Solid Green Flashing Green amp Blue HUD BUD amp Yellow wrist display Magenta wrist
75. he ADV either descend or exhale through your nose and breathe in The ADV is designed to help maintain a breathable lung volume in conjunction with the LCV The ADV on the Explorer is a simple tilt lever system that in the relaxed position no gas applied will remain open It seals when gas is applied If moisture is present in the system and extreme freezing temperatures are experienced that are able to form ice within the rebreather this valve could freeze in the open position Freezing of ADV s is a common failure mode in most rebreathers The EXPLORER design assumes this and provides an additional link to the Pre dive alarm sequence to warn of such a failure If the valve is frozen open then gas will freely flow into the circuit This will give a HIGH HP usage alarm and the unit will fail its Pre dive sequence This is the correct failure mode for this device If the system had been pressurized and then it froze and hence the valve failed closed again pre dive will fail momentarily until counterlung collapse removes the icing as the lever activates then pre dive will pass unless there is a leak due to icing then the pre dive will again fail high gas flow alarm This system was developed because in use no units are completely free from moisture and ADV free flows due to icing regularly occur though there has not been an alarm for it FILLING THE GAS SUPPLY CYLINDERS The nitrox cylinder has a maximum fill pressure This is
76. he HP window will also be in yellow This will result in a flashing Green and Blue on the HUD BUD Magenta indicates unreliable data on the reading being taken This could be caused by a failed sensor Such as a low wireless HP battery This will be coupled with an action to be taken displayed on the STATUS Screen s Action Panel This will result in a flashing green and blue or red signal on the HUD BUD 3 00 13 MENU Fig 3 2 Fig 3 3 METRICS Fig 3 4 Fig 3 5 23 Red A major alarm indicating that information resource has now become critical forcing an open circuit bailout or no dive condition OC Bailout will be displayed on the STATUS Screen s Action Panel and the HUD will flash red and a vibrating alarm will activate on the HUD From the Main Dive Screen two short presses of the right button will bring up the STATUS screen Fig 3 6 so that the user can determine at a glance the status of the system while doing a system check Fig 3 6 oA AUTOMATIC TURN ON FAILSAFE FEATURE Normal practice and training is for the user to turn the EXPLORER on by depressing any button on the wrist display and going through the pre dive checks The following failsafe additions are to reduce the chance of acci dental injury or death by breathing on an EXPLORER that is in off sleeping state EXPLORER uses detection of a diver breathing the loop to automatically turn the unit on BREATHING DETECTIO
77. ibration There is no need to constantly calibrate but it is good practice to check the calibration at the start of a dive sequence using the above method Once it is calibrated to confirm the operation gently breathe across the sensor face until the reading changes Now re install the filter prior to div ing After calibration and with the sensor inserted into the loop if a full pre breathe with fresh absorbent is undertaken the CO reading should fall to Omb This is normal Post dive and with no gas flow breathing you may see a small rise in CO levels due to gas density and pocketing After a pre breathe this should stabilize Blowing into the sensor face may also create the same affect until it is used again normally in the breathing loop WARNING If at anytime you see a reading that is abnormal you should check the calibration 56 Abnormal readings could include 1 A reading fixed at zero or any other number when you are breathing directly onto the sensor face with the rebreather disassembled 2 An abnormally high reading during a dive El NOTE Under CE conditions after approximately 50 minutes at 40 m at 1 6 of CO very high workload in 4 C 39 2 F the CO sensor should read 5 mb 3 Readings that change up and down not in one direction This could be a faulty sensor faulty connection into the Sensor Module or exces sive moisture reaching the sensor face The CO sensor will benefit from calibr
78. icient unless the EXPLORER has been transported to different climates or significantly different ambi ent conditions 41 42 So calibration checks not actual calibrations should be car ried out regularly to ensure the oxygen PPO sensing system is performing correctly Calibrations should be done more spar ingly as it takes time to ensure sensors are exposed to the cor rect conditions Often a bad calibration causes more confusing problems than small errors due to temperature change User error caused by failure to use the appropriate ambient gas air is a big source of sensor errors 1 Don t over calibrate 2 If something seems wrong check everything Do not just execute a calibration to fix the reading You could be making matters worse 3 Keep sensors dry 4 When doing a calibration ensure the sensors are exposed to air force air over the sensors do not just assume they must be exposed to air by now 5 Just removing hoses is not enough to get air to the sen sors Either the breathing routine described in the Pre Dive sequence must be used or the Sensor Module should be re moved from the EXPLORER and sensors allowed to stabilize in ambient air 6 If the EXPLORER has had a change in climate or significant ambient conditions these are good reasons to check calibra tion 7 The readings from the oxygen sensors change with tempera ture If you are diving in warmer or colder water than normal PPO reading
79. iece barrel O rings End cap O rings U ADV diaphragm Oxygen CO sensor connections annually or sooner if damaged ie O Clean at annual Inspect for damage service sooner if Clean with contact needed cleaner Deoxit Gold GN5 Whichever comes Inspect for damage first 12 months or the DO NO USE AFTER DATE If damaged User pack version only annually sooner if Water flush every damaged 2 days Sanitize counterlungs at Oxygen sensors Absorbent canister mesh Counterlungs and LCV port mushroom valve O ring GO O end of each trip or sooner if required Steramine 106 Hoses mouth piece assembly LCV assembly See separate items Fresh water flush on this list daily Sanitize at the end of each trip or sooner if required Wash at end of dive annual or sooner if Fresh water flush tri damaged after dive trip Wash at end of dive annual or sooner if Flush with fresh trip needed water Wash at end of trip annually or sooner if Flush with fresh needed water and sanitize as required Regulator first stage Regulator second stage BOV OPV Wash at end of dive annual or sooner if Flush with fresh damaged water Replace if not holding a negative 107 APPROVED PRODUCTS AND GLOSSARY APPROVED PRODUCTS CO SCRUBBER MATERIAL Intersorb 812 8 12 mesh or Sofnolime 8 12 mesh OXYGEN SENSORS Hollis EXPLORER Sensors CLEANING PRODUCTS Steramine 1 G Tablet
80. ig 2 4 The foam material is sandwiched between the two white filters when the cap is pressed onto the Filter Body Fig 2 5 Filter Absorbing Material Filter wy Filter Body Fig 2 3 El DANGER ONLY the Hollis CO sensor may be used with this unit No other CO sensors are tested or approved Fl NOTE It is neither necessary or recommended to remove the white filters except if damaged or being replaced during annual service El DANGER For accurate CO readings a clean and dry piece of ab sorbent material must be fitted prior to every dive Different envi ronments will produce different amounts of moisture and hence the filter change out routine may vary See PART 3 Section 14 for more important information before use Fig 2 6 Push the CO2 sensor onto its connection jack and then push the CO2 sensor cap assembly in place as shown Fig 2 6 This is a simple O ring push fit and is retained in place once the Sensor Module is assembled into the Canister Step 6 Undo the rubber latches at the base of the Case Front Back as sembly and lift up the Case Back until the hinge at the top is free Fig 2 7 Place to one side Fig 2 7 Step 7 Inside the Explorer case you will find a zippered case containing the LSS Life Support System Remove the LSS from its case Unscrew Fig 2 8 the Optocon charging download connector protection cap if iw Plug in the the power charger You will need to rotate the ca
81. ing hoses Block both inhale exhale and mouthpiece ports and the LP inlet to the second stage Then suck from the mouth piece Faults e If a leak is heard the exhaust valve or the diaphragm may need replac ing If a fault is found Refer to a Hollis service center BREATHING HOSE ASSEMBLY Clean inspect the hose end O rings and assemble BREATHING HOSE ASSEMBLY TESTING Block one end of the hose and blow into the other Look for leaks along the hose while submerging it Repeat for the other hose MOUTHPIECE HOSE ASSEMBLY e Connect the LP feed which should be over the diver s right shoulder to the BOV Replace the LP hose end O ring if required e Fit the breathing hose with the white ID O rings to the left hand side in hale side of the mouthpiece e Repeat for the right hand side black hose 14 BOV HOSE ASSEMBLY TESTING In open circuit mode immerse the BOV Block the exhale hose end black and blow into the inhale hose end white Faults e If bubbles come out of the mouthpiece there may be a leak in the barrel knob O rings Replace as needed EXPLORER LSS MODULE DISASSEMBLY ASSEMBLY e Remove the LSS Module by twisting the lock ring counterclockwise 1 2 turn e Inspect amp clean O ring and sealing surfaces re lubricate and refit the LSS Module sealing O rings e Refit the LSS Module by lining up the solenoid post pushing it into the Canister and turning the lock ring clockwise by 180
82. ith a cloth and contact cleaner e Check the sensor membrane A certain amount of moisture will always 103 appear on and around the sensors If you suspect excessive water has made contact with the sensor faces Remove excess water carefully with a paper tissue and leave to dry in a warm area If the jack socket on the sensor is wet the sensor may be damaged as the electronics inside the sensor will also be wet Il WARNING Flooded sensors must be replaced iDa SERVICE Your instructor will educate you on what you the end user can service yourself For all other service needs your Hollis Explorer Technician has been trained in the proper skills to service your your Hollis equipment Always follow the Maintenance Schedule at the end of this chapter to keep your EXPLORER in peak condition The EXPLORER also keeps a log of usage hours and it will display a service reminder when it is close to the service interval Fig 7 1 Fig 7 1 105 MAINTENANCE SCHEDULE KEY E before every dive A annually C at canister change 30 30 hours annually or sooner if damaged annually or sooner if damaged U E swap 10 hours or sooner Change the sponge if damaged for a dry one every Quad Seal U CO sensor filter sponge dive Replace after 10 hours annually or sooner if damaged If pre dive failed annually or sooner if leaks damaged annually sooner if damaged Hose end O rings U Mouthp
83. itional bailout cylinder of a minimum capacity of 3 L 20 cuft be used in conjunction with the 5L 40 cuft cylinder Fi NOTE All calculations presented in this manual assume the use of a 5 L 40 cuft cylinder USA Only Cylinder Options Chart Any brand that is _ ls prepped for nitrox use acae eimai as 526 sures are shown 4 3 35 26 Fl NOTE The Explorer can accomadate a maximum 14 cm 5 5 in diameter tank EU Only Cylinder Chart OUTER CASE The outer case is made from high impact plastic OVER PRESSURE VALVES EXPLORER uses a combined water release and balanced Loop Control Valve LCV The balanced valve ensures that the underwater release pressure is near constant in any orientation When the unit vents it also removes any water from the exhale counterlung Water removal is best conducted in a heads up position In addition to the LCV there is a master high flow over pressure release valve that is set to 40 mb to help control ascents BOV BAILOUT VALVE EXPLORER comes with a BOV The BOV is supplied by the onboard nitrox tank The BOV is designed as the primary bail out providing a sufficient planned volume is carried The BOV has two modes Fig 1 1 e OC Open Circuit Position e CC Closed Circuit Position When the BOV is open the BOV is in the closed circuit position and when the BOV is closed it is in the open circuit position INTELLIGENT HUD HEADS UP DISPLAY amp BUD BUDDY UNI
84. kaging 2 Inspect the quad ring for cleanliness damage 3 Apply a small amount of lubricant to the quad ring 4 Wipe any dust from inside the canister 5 Install the Scrubber Pack 6 Refit the Right Hand end cap 7 Dispose of old absorbent as normal household waste Do not leave it lying around for animals to ingest CO ABSORBENT STORAGE El DANGER Once a CO Scrubber has been packed it should remain so Do not attempt to remove absorbent from a partly used scrub ber and dry it refurbish or re pack the absorbent in any way After a dive and providing the absorbent scrubber remains in a sealed state i e within a closed EXPLORER loop it may be used again until the limit of the absorbent timer is reached Storage for more than 24 hours is not recommended and a used absorbent scrubber removed from the canister should be discarded 85 PRE DIVE SETUP Having assembled and tested the unit upon receipt it is still critical that all pre dive tests are conducted prior to diving The EXPLORER is equipped with a set of pre dive checks that are built into the electronics prompting the diver to test certain aspects of the unit prior to diving Additionally there are several manual tasks that should be com pleted prior to this final system check These checks automatically start once you turn the unit on A complete flow chart of all the screen layouts can be found on the enclosed CD and in the rear of this manual TURN ON SYSTEMS
85. lay if the maximum operating depth of the unit is exceeded This MOD is based on three things 1 Amaximum depth of 40 m 130 ft 2 Amaximum depth such that the gas attached to the unit as measured cannot result in a PPO exceeding 1 6bar 3 When a maximum PPO of 1 6 bar is reached The EXPLORER will not freeze the user out of operation if these depths are exceeded However the system and diver are operating beyond the normal recommended conditions and therefore these limits should never be routinely exceeded WARNING Exceeding these limits is not condoned by the manu facturer and is not a safe diving practice and must be avoided If an MOD alarm is seen then you should ascend immediately to a depth where the alarm is not displayed This depth reduction should be at least 6 m 20 ft but could be more if the MOD has been exceeded by a large amount SS DIVING AT ALTITUDE WARNING Diving at high altitude requires special knowledge of the variations imposed upon divers their activities and their equipment by the decrease in atmospheric pressures Hollis rec ommends completion of a specialized Altitude training course by a recognized training agency prior to diving in high altitude lakes or rivers The Explorer is fitted with a digital depth sensor For it to accurately gauge altitude and preceding dive depths the Explorer must be turned on prior to diving This is the normal process as a predive must be conducted It beco
86. ll reduce to save gas and maintain the NDL at 60 minutes 4 The minimum DCP is 10 If the DCP is 10 and the NDL exceeds 60 minutes the DCP will not decrease Auto DCP Mode i Example shallow dive using 40 Nitrox NDL too high gt 60 DCP will remain T at 10 Auto DCP mode 2 begins at 10m depth i DCP setto 95 NDL 167mins NDL 89mins 12m DCP 50 DCP 10 NDL control using DCP begins at 10mins NDL 130mins NDL 60mins o ens Cerne O eth See ten eee DCP 95 ire BY oe NDL too high gt 60 DCP will setto 10 to save gas NDL 46mins ja 5mins 18m DCP 95 DCP 95 10mins 52mins Dive Time minutes 60mins 68niins 36 RMS RESOURCES MANAGEMENT SYSTEM The control of PPO is the prime function for EXPLORER In addition it monitors a range of dive resources The LSS is able to make advanced decisions based on available resources in order to modify the PPO and provide for the longest possible dive The unit constantly monitors all resources such as available gas scrub ber duration etc and keeps the dive within parameters that allows for a safe bailout ascent The unit uses a forward looking algorithm to deter mine the best PPO at any given time to avoid or reduce decompression allow for a safe open circuit ascent and stay within safe battery and scrubber durations Resources monitored include e Depth e NDL PPO e PCO e Battery e HP gas e CNS Oxygen toxicity e Filter
87. lorer certified divers who have been away from diving for an extend ed period of time and would benefit from an instructor led refresher course to regain skills and mastery of the Hollis Explorer Failure to do so can lead to serious injury or death W WARNING NITROX STATEMENT The EXPLORER equipment is classified as being suitable for use with nitrogen oxygen Nitrox breath ing gas mixtures containing up to 40 oxygen by volume without the need for special preparation cleaning or component parts If Explorer equipment is subsequently used with equipment or connected to an air supply system that is not rated for Oxygen Service it can subsequently be used with Nitrox up to 40 O2 as long as the equipment is maintained in accordance with the procedures and parts specified in the Hollis EXPLOR ER Product Service Guide The EXPLORER was designed for use with Nitrox up to 40 O2 DO NOT use gas mixtures with a fraction of oxygen greater than 40 with your EXPLORER MW WARNING CAUSTIC MATERIAL The CO absorbent used in the scrubber is caustic alkaline material Take steps to protect yourself from direct lung and skin contact Furthermore poor management of the breathing loop could lead to water contact with the CO absorbent causing a caustic cocktail very caustic liquid This could lead to se vere chemical burns and if inhaled possible drowning Proper handling procedures pre dive checks dive techniques and maintenance
88. mes especially important if you have transported the Explorer to a change in surface altitude LOW PO SAFETY TURN ON amp INJECTION The Explorer has a safety feature that will cause an activation and attempt ed nitrox injection to raise the PO in the breathing loop if the LSS detects a drop of PO to a level of 0 17 or below This is an attempt by the system to prevent a hypoxic condition in the breathing loop It is important to understand and remember from your training that with an increase in altitude decrease in ambient pressure the PO of ambient air will drop Regardless of a constant FO of 0 21 the PO what the oxygen sensors measure may drop to or below 0 17 This would occur above 5 000 ft 1 524 m of altitude To avoid accidental activation during transport either remove the oxygen sensors or add sufficient nitrox to the loop Upon reaching altitude rein stall the sensors and check the calibration as a part of the normal predive sequence For clarity the Explorer can be oxygen calibrated in air at any altitude To register the correct dive depths at any altitude the Explorer must be turned on at the intended dive site altitude to establish a correct surface pressure reading 74 DECOMPRESSION CONTINGENCY The EXPLORER is designed for recreational diving without decompression All dives however require safety decompression stops to be conducted consult your training agency for information If you accidentally
89. minutes the readings are correlated mbar Fig 3 27 KEY BLUE ANSTI PINK CO2 sensor inside breathing loop Y scale CO2 mbar 59 60 DISPLAY amp ALARM SYSTEMS HUD BUD amp COLOR SCREENS The EXPLORER can be routinely dived by using the HUD Heads Up Display as the main underwater human interface This frees up the diver to concentrate on the dive at hand The HUD is in the divers vision and attached to the BOV It utilizes color LED s and a vibration feature to get your attention when necessary Additionally the EXPLORER has a BUD Buddy Universal Display on the side of the LSS Module for the Buddy Instructor to see your status at a glance Both the HUD and BUD indicate the same color codes lf the HUD BUD system changes from Green for go mode to a flashing green blue then the diver can refer to the main wrist display and investigate the additional information on the STATUS display The wrist display utilizes color as an alert for general status changes and couples this alert with unprecedented clarity of information that can be reviewed in further detail The HUD BUD color screens on the wrist display and uncluttered screen layouts are key to providing the diver and dive team with essential information in high stress scenarios DEFINITIONS Alarm state These are mostly alarm ing conditions but not always They could represent a state of the system that is displayed in some way other t
90. nsors must be exposed to the pure calibrating gas So for an air calibration the sensors must be flushed with air Just taking the hoses off is NOT sufficient as pockets of gas can be enveloping the sensors 2 DO NOT execute calibrations to remedy a rebreather whose PPO accuracy is drifting over short periods of time Some other problem is likely to be the cause in this instance Possible causes include e Oxygen sensors have become wet e Current gas exposed to the Oxygen sensors is not what you think it is e The mini jack connection is corroded Check the readings on the STATUS screen average or Service Mode STATUS Screen all 3 sensors If a sensor is reading incorrectly first remove it and clean the mini jack connector This can be done with Hollis approved elec trical contact cleaner or simply by wiping the connector with a lint free cloth DO NOT scratch the connector with a metal instrument Then look for droplets of moisture on the sensor membrane Use a rolled tissue to gently wick any moisture drop lets from the sensor WITHOUT making contact with the sensor membrane itself Pushing on the sensor membrane face can destroy the sensor If neither of these corrects the reading then the sensor should be replaced The Oxygen sensors vary only slightly over time Temperature atmospheric pressure and moisture have far greater short term effects on the readings Calibrations carried out once a week should be more than suff
91. od of correct operation Any sense of dizziness nausea or oth er CO symptoms should also be used to alert the diver that the scrubber is not operating correctly A small bypass due to a badly fitted scrubber or CO seals could give a scenario of a good peak but an excessive amount of CO could still bypass the scrubber If this occurs stop breathing on the EXPLORER This will be indicated and alarmed for by the Gaseous CO sensor Replace the absorbent and or check scrubber packing and seat ing CAUTION Pre breathing any rebreather should be done in a safe seated position where the diver can monitor displays and any potential symptoms of CO poisoning Pre breathing should never be conducted while walking or standing in a place where the diver could fall into the water or injure him or herself The actual minutes remaining number displayed to the diver comes from the Nitox Injection Monitor This gives a consistent and reliable reading of current absorbent duration based on nitrox injection Always remember to reset the absorbent duration when a new scrubber is fitted You will be prompted to do this during the Pre dive sequence Fig 3 21 El DANGER DO NOT reset the absorbent duration unless a new scrubber with fresh absorbent has been fitted Always change the absorbent when the low filter scrubber alarm appears or before if you suspect the absorbent is not operating correctly or close to Fig 3 21 the end of its lif
92. of how short a duration Some rebreather fatalities are possibly due to us ers pushing the CO scrubber with strenuous activity near the end of the scrubber life Increased depth or reductions in temperature when the CO scrubber is near the end of its life are also not advised as the scrubber is less able to cope with high CO levels So increased depth coupled with muscular ac tivity and cold are a very bad combination when near the end of scrubber life where CO levels are already raised Fl NOTE Conversely reducing your depth and work rate and re turning to warmer water are all good ways to manage CO levels until you can return to the surface and change the scrubber In any event if a CO alarm is seen the EXPLORER will force an immediate action to return you to the surface 53 GASEOUS CO SENSOR SYSTEM CONSTRUCTION The CO sensor system is comprised of a Sensor and a removable changeable filter The basic principle of the system is to use Infra Red technology to detect carbon dioxide CO in the rebreaters breathing loop However certain contaminants and in particular moisture will affect the sensors ability to read accurately To help with this issue the assembly comes complete with a user changeable filter system that can be simply disconnected from the Sensor Module and serviced by the diver Fig 3 22 Fig 3 22 El DANGER Periodic calibration of the CO2 sensor in air and mainte nance of its filtration sy
93. omfortable it should not be loose The harness will sit differently on land compared to when you are in the water OCTOPUS BAILOUT amp CYLINDER CONFIGURATIONS While the exact gas requirements for any type of diving are a matter of per sonal choice and predicted by specific level of EXPLORER certification and training agency it is vital that a breathable open circuit bailout is carried at all times for all depths of the dive of sufficient volume to allow a safe ascent to the surface with a stressed breathing rate Hl NOTE Certain training agencies may required additional gas supplies for diving in mixed teams open circuit closed circuit Please check with your agency for details L Z 78 F DANGER It is vital that a breathable open circuit bailout is carried at all times for all depths of the dive of sufficient volume to allow for a safe ascent to the surface at a stressed breathing rate El DANGER For deep long duration dives the onboard gas supply should only be treated as a short term gas supply used for a limit ed period until the off board bailout gas can be accessed WARNING In depths shallower than 18 m 60 ft you must be able to provide gas to another diver buddy This will require the use of an additional second stage octo attached to your EXPLORER first stage if you are not carrying an external bailout cylinder El NOTE The BOV is connected to the onboard gas supply Dives shallower than 18 m 6
94. onditioned environment Fig 3 23 IH WARNING Each foam material piece should only be used for a maximum of 10 dive hours or if damage is noted Replaced it soon er if the readings from the CO sensor are not within the expected range i e almost Omb at the end of the Pre dive sequence with a new foam material fitted El DANGER Failure to replace the foam material may result in faulty CO readings 55 If debris is noted on the front face of the hard white filter or if it is suspect ed that contamination is restricting the flow through the filter it should be replaced CALIBRATION During the Pre dive sequence you are prompted if you want to calibrate the CO sensor Fig 3 24 Fig 3 24 The ONLY source of calibration gas is fresh air With the filter removed and the sensor in fresh air the CO reading should read 0 4mb 0 1mb Leave the sensor exposed for at least 5 minutes The on screen prompts will guide you through the calibration This involves removing the exhale hose from the mouthpiece and breathing the unit for one minute to circulate fresh air into the system I WARNING At the end of a Pre dive sequence with a new filter fitted the CO readings should be almost Omb If this is not the case then the sensor must be recalibrated as above or replaced Fl NOTE Post dive if you want to do another calibration you must remove the filter cap to calibrate The same system should be used to just check the cal
95. ove sharp edges from the cable tie BOV PRIMARY TEST In closed circuit mode block the right hand exhale side and blow do not apply excessive force into the mouthpiece The inhale diver s left side mushroom valve should seal and no gas should exit out of the second stage exhaust or the front diaphragm Faults e Mushroom valve inhale side leak Remove the carrier and inspect the mushroom valve and O ring Replace as needed e BOV barrel O ring or activation handle O ring leak Replace O ring In closed circuit mode block the inhale diver s left side and suck into the mouthpiece Faults e Mushroom valve right hand side leak Remove the carrier and inspect mushroom valve and O ring Replace as needed e BOV barrel O ring or activation handle O ring leak Replace O ring EXPLORER Fig 2 19 Remove both hoses from the Canister leave connected at the BOV Put the BOV in open circuit mode Block the exhale hose end and blow into the inhale hose end Listen and observe for any signs of leaks from the mouth piece or hose ends hoses Faults If a leak is detected from the mouthpiece outlet then the barrel O rings need replacing e If a leak is detected at the hose ends then replace the hose end O rings If a leak is detected along the hoses then refer to your Hollis dealer for hose replacement BOV SECONDARY TEST In open circuit mode with the second stage BOV HP gas turned OFF Remove the breath
96. pport System Module LSS and pulling the SM out The SM carries the three oxygen sensors and the CO sensor Post dive the CO filter yellow cap sponge should be replaced as de tailed At the end of a days diving the complete SM should be removed and the LSS cap refitted and kept in a dry low humidity and ambient tempera ture environment The CO filter cap should be removed for the non diving period SANITIZING After a dive the Explorer breathing loop needs to be sanitized The recom mended sanitizer for the Explorer is Steramine This sanitizer is available through your Hollis dealer Please see www sSteramine com for Safety Handling Instructions Basic sanitizing can be conducted by making up a solution in the correct quantities and soaking or wiping the part with the solution IH WARNING The use of any other sanitizing agent may damage the component parts of the rebreather in particular the mushroom valves 93 94 Items to be sanitized are e The BOV and hoses e The counterlungs e The canister tube and all its internal components Il WARNING You MUST make sure you read the Material Safety Data information before using The hoses should be removed and Steramine solution should be flushed through the complete assembly and allowed to drain out To remove excess solution push the hose corrugations together like using a concer tina to squeeze the water out RECHARGING Please see Batteries
97. r failures etc Low HP gas in dive cylinder Message Meaning CALIBRATE CONFIR tv Wireless HP sender battery is low Analyzed gas is not what is expected by the DEFAULT GAS setting Analyze gas and check setting The LCV and OPV are not vent ing at the correct pressure Flush valves with fresh water and repeat test If the problem persists return the unit to your dealer You have stopped breathing while conducting a pre breathe se quence Repeat the test If the error per sists return the unit to your dealer If the Predive sequence is com pleted the STATUS window is active and you see the above alarm then HP usage is greater than 1bar min 14 7 psi min This could indicate a leak in the HP or LP circuit internal pipe work BC or BOV Submerge to locate the leak 91 EMERGENCY START UP SYSTEM ESS Should you have no option other than to enter the water immediately EXPLORER will activate the display and show all pertinent alarms in the STATUS screen It is vital that you correct anything in error immediately before continuing to dive If you enter the water without completing the relevant Pre dive checks and ESS mode is activated you will be given an O C bailout alarm red HUD warning you to return to the surface immediately to complete the Pre dive checks After 1 minute underwater if nothing else is alarming MENU the bailout alarm will stop Fig 4 7 gt E UP
98. rease if towards the end of its life it is taken deeper or the work rate increases Be aware that the CO reading can rise dramatically for higher work rates and deeper depths especially when an absorbent has been used for over 50 of its recommended duration Therefore in order of priority the EXPLORER is fitted with an optional gaseous CO sensor a metabolism click counter providing an estimate of oxygen consumed hence CO generated and a TPM giving an indication of thermal activity within the scrubber These three features give a more accurate indication of absorbent life remaining The use of the CO readings is four fold 1 To ensure active absorbent has been fitted 2 To ensure the absorbent sealing systems are operative 3 To warn of reducing absorbent efficiency in order to give the diver time 50 to respond by reducing depth temperature or work rate to avoid an inci dent occurring 4 To warn of rare situations when excessively high CO levels may require immediate bailout to safe open circuit gas El DANGER The CO sensor should NOT be used to determine absor bent duration DO NOT push scrubbers past recommended dura tion times Hl NOTE As more actual dive data becomes available it may be possible to model the CO curves and generate some level of prediction of remaining absorbent life This is currently a work in progress CO CARBON DIOXIDE SENSOR FOR EXPLORER This section describes th
99. ressing the LSS assembly into position turn the the lock ring clockwise 180 degrees until the tab rests in the other notch on the Explor er case Step 9 Adjust the included Harness or optional BCD for proper fit Fl NOTE See the Hollis Buoyancy Guide doc 12 4012 for instruc tions on the Harness and Wing fittment and proper use It may be downloaded from http hollisgear com support_manuals asp Fig 2 12 40 Step 10 Inspect the mushroom valves in the BOV and make sure they are In place El DANGER Your Explorer must have proper mushroom valve func tion before every dive See BOV Assembly subsection in the Complete Disassembly amp Reassembly PART 2 Section 3 of this manual for instructions on testing the mushroom valves Attach the regulator LP hose to the BOV and gently tighten the nut to the hose inlet Fig 2 13 item C After inspecting the hose end O rings attach the breathing hoses to the BOV Ensure the white hose end goes to the inhale side Fig 2 13 item B of the BOV Attach the HUD Bracket to the inhalation side hose nut and snap the HUD into the HUD Bracket Fig 2 14 The HUD Bracket is secured with an O ring attached to the two tabs on the underside of the bracket Step 11 Ensure the counterlungs are correctly positioned where they will not get pinched cut or unecessarily restricted Fig 2 15 Then refit the Case Back and secure the two clips at its base Fig 2 16 I WARNING Ensure
100. s 49 The problem can arise that if a diver has gone deep and works hard per haps to rescue another diver when the absorbent duration is near its limit the extra depth and work rate push the CO to dangerously high levels very quickly The CO sensor will help by giving feedback in this scenario and advise the diver of the high CO levels The diver should then reduce their work rate and reduce their depth and finish the dive as safely as possible or bail out to open circuit as indicated The relatively fast rise in CO readings is also an indication that the absorbent cannot be pushed any harder without causing even higher CO levels A question asked by many divers who have seen the system in operation is Can the CO reading be used to determine the duration remaining in the scrubber No it cannot It is designed and intended to detect for bad absorbent no absorbent high work rates and general CO seal issues I WARNING Currently the CO sensor reading should not be used as a duration meter for the rebreather It is vital that it is used to re port and alarm for a high CO reading that could occur with a faulty seal or exhausted absorbent Our bodies produce the same CO quantities independently of depth So just staying shallow does not reduce CO It can however help the CO absorbent perform more efficiently Therefore a low CO reading on a scrubber that has been used in shallow water for some time may rapidly inc
101. s will vary Ensure calibrations take place at a temperature as close to diving conditions as possible OXYGEN SENSOR VOTING VOTING METHOD The EXPLORER has a method of automatically removing Oxygen sensor sensors from the PPO averaging and entering a fail safe mode when it is not possible to resolve an accurate PPO reading Rules 1 If a single sensor is below 0 15 bar or above 3 00 bar then it will be removed from the averaging a BAD CELL DO NOT DIVE alarm will be displayed if not diving or ASCEND BAD CELL if diving Diver Action Open circuit Bailout to surface 2 If a sensor is less than 7 mV then it will be removed from the averaging a BAD CELL DO NOT DIVE alarm will be displayed if not diving or ASCEND BAD CELL if diving Diver Action Open circuit Bailout to surface 3 If one sensor is 0 2 bar away from the two remaining sensors then it will be removed from the averaging a BAD CELL DO NOT DIVE alarm will be displayed if not diving or ASCEND BAD CELL if diving Diver Action Open circuit Bailout to surface 4 If all three cells are removed from the averaging for the same reason i e all low or all high then all cells will be used in the averaging Super seding rules 1 2 and 3 a BAD CELLS DO NOT DIVE alarm will be displayed if not diving or ASCEND BAD CELLS if diving Diver Action Open circuit Bailout to surface 5 If the difference bet
102. soapy water and then rinse in fresh water Then allow it to dry 4 Place the Dust Filter inside at the base of the scrubber canister Fig 4 3 It should lay smoothly against the metal screen bottom with the tabs along the radial edge folded upwards Ensure that the tabs lay smoothly 84 against the inner walls of the scrubber canister 5 Fill the canister in a well ventilated environment Raise the absorbent barrel at least 200mm 8 inches above the canister to allow dust to blow away as you fill Fill to the top of the canister making sure absorbent is at an even depth across the canister 6 Pack the absorbent by tapping the sides for at least 1 minute 7 Fill to the top again 8 Pack the absorbent by tapping the sides for at least 1 minute 9 Refill with Absorbent to the top Tap down as required until you can fit the lid Refit the lid and the spring under the yellow nut 10 Screw down the top nut 11 Wipe any dust from inside the canister 12 Look into the Canister head and run your finger around the sealing face for the quad ring removing any debris 13 Insert the filled Scrubber Pack into the Canister 14 Refit the Right Hand end cap 15 Dispose of old absorbent as normal household waste Do not leave it lying around for animals to ingest Filling instructions are also found on the side of the canister tube FILLING STEPS PRE PACKED SCRUBBER VERSION ONLY 1 Remove the Scrubber Pack from it sealed pac
103. stem is vital to accurate sensor readings El DANGER The calibration of the sensor must be confirmed peri odically by exposing it to air CO readings in air should be 0 4 0 1 mb If in doubt then recalibrate the sensor CO FILTER CARE El DANGER For accurate CO readings a clean and moist dampened with water to soften and all liquid wrung out piece of absorbent material must be fitted prior to every dive Different environments will produce different amounts of moisture hence the filter change out routine may vary 54 The filter cap attaches to the filter body and is a push fit The basic con struction of the filter starts with a specialized hard filter material in the cap the white material backed up by a water absorbing foam material the central sponge like material in the picture Foam Material Filter Filter Body Filter Cap El NOTE The filter cap retains the hard filters white material and yellow that must ALWAYS be present when using the CO Sen sor The Sensor itself is not a user serviceable part and damage may result if it is tampered with If the filter cap membrane be comes damaged it must be replaced The yellow foam sponge material center of picture is removable The EXPLORER is supplied with spare foam material Simply remove one and refit a new one Fig 3 23 The foam material will become saturated during a dive The used foam material can be dried again preferably in an air c
104. stem that not only records all the units sensors depth time PO etc but also records any alarms and error messages such as missed Pre dive checks This information can be retrieved through the data download Users can obtain dive download software from http hollis com support asp STATUS SCREEN The EXPLORER has two levels of detailed information available to the diver The primary method is via the STATUS screen There is an additional set of STATUS screens in service mode described in the PART 3 Section 6 of this chapter The STATUS screen shows as soon as the EXPLORER is turned on Fig 3 1 In addition Status screens can be viewed at any point in the dive by press ing any button and selecting STAT from the pop up menu using a short push of the right button It can also be accessed in service mode by select ing STAT a short push of both buttons from the Startup screen Note that in both cases the STAT button indication is colored blue as are all button indicators modified by service mode Once in the STATUS screen a short press of the left or right button scrolls through the information options These are a PPO average of the 3 sensors b CO sensor c HP gas d Battery life e No Decompression Limit NDL f Decompression Information g Filter CO scrubber h CNS i A general Warnings Window the ACTION Panel detailing any alarm in progress This mostly displays SYSTEM OK or DO PRE
105. ster or restrict the hose to stop the counterlung venting through the LCV e Turn on the gas e Put the BOV into closed circuit mode e Inflate the counterlungs by blowing into the loop until it is full then put the BOV in open circuit mode e Fully submerge the unit and look for leaks Fig 2 31 El NOTE The OPV situated under the Canister will vent some bub bles THIS IS NORMAL Look for other leaks WARNING Complete all gear prep and pre dive sequence checks before diving 19 LIFE SUPPORT SYSTEM COMPUTER GENERAL OPERATION The EXPLORER Life Support System LSS is designed around a breathing loop high pressure gas sources and electronics control system all highly integrated to give an intelligent but simple display of status to the diver while providing life support This integration gives the user a simple Check and Dive functionality that makes the EXPLORER the easiest Rebreather to prepare for diving while ensuring system integrity and improving safety The software and hardware uses intelligent monitoring and design experi ence to determine the appropriate tests and checks that the diver needs to perform to get the EXPLORER ready for use Any problems are described clearly on the STATUS screen with the re quired action The integrated system design means that failures or problems with any part of the system are communicated to the diver either in pre dive checks and procedures or as data values gr
106. stray into decompression the system will generate a green blue HUD alarm the decompression stop and stop time will be displayed on the STATUS screen This feature is designed for contingency purposes only El DANGER The EXPLORER is not designed for use with gases other than Nitrox WARNING Decompression diving significantly increases the risk of decompression illness Various alarms will be generated if elements of decompression are vio lated Please see the Deco States Table below and the EXPLORER flow charts for further detail DECO STATES Missed Stop Missed deco stop Blue Green MISSED STOP USE TABLES Too Shallow Deco Ceiling violated Blue Green DECO for lt 1 min DESCEND NOW At Stop Within 1 m 3 3 ft below Blue Green AT STOP the next stop WAIT x MINS Near Stop Within 3 m 10 ft Blue Green NEAR STOP of the next stop ASCEND TO x M FT Too Deep gt 3 m 10 ft below ceiling Blue Green DECO ASCEND TO x M FT El NOTE When you have decompression stops to complete or if any alarm is showing the STATUS display will remain on and not automatically time out 75 INTERNET REPROGRAMMING The EXPLORER can be automatically reprogrammed and upgraded with new software downloads from the Internet The PC Link option enables use of this feature Contact the manufacturer web site or your dealer for more information Some updates will be available for a fee Other updates will be free To check if you re EXPLORE
107. t__ Instructor 4 Post dive care Student ___ Instructor 5 Complete Explorer Exam Student Instructor with a minimum score of 80 missed questions reviewed with instructor IN WATER SKILLS 1 Pre dive checks Student Instructor 2 Callibration of EXPLORER Student__ Instructor 3 In water leak buoyancy and trim checks Student__ Instructor 4 Carry and use of additional bailout gas Student Instructor 5 Dive Control Parameter Adjustment Student__ Instructor 6 Remove and replace unit on surface Student Instructor 7 Electronics operation Student Instructor 8 SMB deployment Student Instructor 9 Remove water from the breathing loop with the LCV Student____ Instructor 10 HUD use STATUS monitoring Student Instructor 11 Gas share with a buddy Student___ Instructor IN WATER SKILLS 12 Equalizing ears Student Instructor 13 Mask clearing skills Student___ Instructor 14 Drysuit use where applicable Student__ Instructor 15 Reducing compliant lung volume Student___ Instructor 16 Follow dive plan not exceeding depth or dive time Student_____ Instructor 17 Maintain depth while making Safety Stop Student Instructor 18 Omitted decompression procedures Student___ Instructor IDa LONG TERM MAINTENANCE amp SERVICE OXYGEN SENSORS APPROVED OXYGEN SENSORS The EXPLORER is only approved to use Hollis EXPLORER Oxygen Sen sors Hollis EXPLORER Oxygen Sensors have temperature ranges as detailed below Operating temperature
108. tatic effects of the counterlung position and the breathable volume within the counter lungs It is important to balance the volume in the breathing loop so that exces sive inhale or exhale pressure is not experienced Under certain situations the EXPLORER will vent during the exhaled breath This will result in a drop in oxygen levels and more gas addition by the system It is possible to balance the loop to an extent by venting a small amount through your nose particularly on ascents if the need arises ADJUSTING THE BREATHING FEEL The breathing feel of EXPLORER is partially controlled by the LCV Having removed the case cover this can be seen underneath the Canister This is an adjustable valve over a small range Oriented as shown Moving the valve to the left vents more easily and to the right it vents at a slightly elevated pressure Fig 4 1 The LCV is a hydrostatically balanced valve this means that in any swim position it releases gas from counterlungs at approximately the same pres sure and rate In addition it is a water drain device and it is connected to the exhale counterlung via a water drain tube such that as water enters the counterlung condensed exhaled breath then it moves through the tube and out of the LCV regularly throughout the dive i 79 THE AUTOMATIC DILUENT VALVE The EXPLORER also has an automatic diluent addition valve ADV which compensates for loss of gas volume To activate t
109. tes continued Below is a table of endurance versus depth and changing workloads with temperature MINUTES TO 5MB CO REFERENCE 40 m 130 ft 40 l min 4 C 39 F ming 40 m 130 ft 120 minutes 22 5 l min Normal 15 C 59 F reserve swimming Capacity 40 m 130 ft 40 l min 15 C 59 F ming El DANGER Ventilation rates up to 40 I min are referenced as Nor mal swimming and rates of 40 l min and above are referenced as Hard swimming Under strenuous conditions however consump tion rates may be significantly higher Regardless of conditions or readings on the computer the scrubber should NEVER be used for more than 2 hours IH WARNING These tests were conducted using Hollis approved absorbent grade and durations can only be duplicated using this grade DO NOT use any other type of absorbent with the EXPLOR ER Safety data on absorbent products can be found at http www molecularproducts co uk Tests conclude that depth gas density temperature and CO generation all massively affect absorbent duration The EXPLORER employs a highly efficient axial canister design which not only offers greatly extended dura tions when compared to other designs employing a similar absorbent load but it is less affected by the commonly experienced high loss of efficiency associated with increased depth 83 HANDLING ABSORBENT I WARNING CO absorbent may cause burns to eyes and skin First aid treatment is as follows
110. the rebreather design Some divers feel they are getting more duration because they are not producing as much CO as that used in CE trials or that other variables are less extreme within their diving environment Information from field use with the CO sensor indicates the scrubber durations are actually quite close to the CE durations and the 5 mB CO point However 5 mBar of CO is not fundamentally damaging Metabolism and respiration can occur to some degree even up to 20mB CO However the amount of exertion and other pressure related effects mean that this is unadvisable and CO poisoning and death may occur at levels in the 10 20 mB range in some cases So some of the extended durations currently experienced are due to the user taking the CO level into the 5 10 mB range without any obvious symptoms of CO poisoning The user must be aware that strenuous exertion when CO is at these elevated levels can quickly cause the CO levels to rise rapidly As the symptoms of CO poisoning are almost impossible for the user to recog nize they will just pass out and may drown However the readings from the CO sensor showing that CO levels are rising while still not exhibiting symptoms should be used as much as anything to limit the strenuous activity and further use of the scrubber after the dive has finished El DANGER New dives must not be performed on the scrubber once CO levels in the 5 10 mB region have occurred regardless
111. ver should warm and visually inspect the mushroom valves between dives Open circuit bailout must be rated and compatible with the environments dived in vii viii TABLE OF CONTENTS General Safety Statements amp Warnings iii vii PART 1 YOUR NEW EXPLORER SECTION 1 REBREATHER LIFE SUPPORT SYSTEM RULES SECTION 2 GAS FLOW SECTION 3 MECHANICAL FEATURES PART 2 UNPACKING YOUR NEW EXPLORER SECTION 1 BATTERIES SECTION 2 INITIAL ASSEMBLY SECTION 3 COMPLETE DISASSEMBLY amp REASSEMBL PART 3 LIFE SUPPORT SYSTEM COMPUTER SECTION 1 GENERAL OPS SECTION 2 AUTOMATIC TURN ON SECTION 3 DISPLAY SYMBOLS SECTION 4 SCREEN ICONS SECTION 5 DIVE SCREENS SECTION 6 STATUS SCREENS SECTION 7 MAIN MENU SECTION 8 SETUP MENU SECTION 9 BAILOUT amp GAS CONFIGURATION SECTION 10 DCP DIVE CONTROL PARAMETER SECTION 11 RMS RESOURCES MANAGEMENT SYSTEM SECTION 12 O SENSOR CALIBRATION SECTION 13 O SENSOR VOTING SECTION 14 CDM CANISTER DURATION METER SECTION 15 DISPLAY amp ALARM SYSTEMS SECTION 16 ALARM FLOW DIAGRAMS SECTION 17 GAS RESERVES SECTION 18 MOD MAXIMUM OPERATING DEPTH SECTION 19 DIVING AT ALTITUDE SECTION 20 DECO CONTINGENCY SECTION 21 INTERNET REPROGRAMMING PART 4 GETTING READY TO DIVE SECTION 1 GEAR PREP SECTION 2 CO ABSORBENT SCRUBBER PACK SECTION 3 PRE DIVE SETUP PART 5 POST DIVE SECTION 1 DAILY MAINTENANCE PART 6
112. ween the highest sensor and the lowest is greater than 0 5bar then the system will inject gas for 1 second out of every 3 as a fail safe This will cause an ASCEND NOW alarm Diver Action Open circuit Bailout to surface 43 44 6 If the average of all sensors not removed from the averaging by rules 1 2 3 or 4 is greater than 1 6 bar when diving then an ASCEND NOW alarm will be displayed Diver Action Open circuit Bailout to surface 7 lf the average of all sensors is less than 0 17 or greater than 2 0 when diving then a BAILOUT alarm will display El NOTE This alarm will supersede those in rules 1 2 3 4 5 and 6 Diver Action Open circuit Bailout to surface 8 If two or more sensors are removed from the averaging because of rules 1 2 3 or 4 then the system will inject gas for 1 second out of every 3 as a fail safe This will cause an ASCEND NOW alarm Diver Action Open circuit Bailout to surface EXAMPLES 1 Sensor 1 0 65bar sensor 2 0 60bar sensor 3 0 70bar All sensors used 2 Sensor 1 0 3bar sensor 2 0 60bar sensor 3 0 70bar Sensors 2 and 3 still used 3 Sensor 1 O 3bar sensor 2 0 60bar sensor 3 0 9bar Failsafe inject for 1 second out of every 3 Sensors are greater than 0 5 apart across all 3 sensors 0 3 to 0 9 CDM CANISTER DURATION METER The EXPLORER Canister Duration Meter CDM is comprised of three main parts 1 A patented absorbent temper
113. wise unscrew the breathing hose ends e Remove and inspect the hose end O rings for damage e Using the rubberized end of a pencil or other blunt soft instrument insert the pencil through one of the mushroom valve carriers moving the mush room valve aside first and gently push out the opposite carrier assembly Fig 2 17 Fl NOTE DO NOT push on the center of the carrier ONLY push on the outer edge e Remove the mushroom valve carrier O rings Fig 2 17 e Gently pull out the mushroom valve Fig 2 18 Fig 2 18 1a BOV REASSEMBLY amp CARE e Clean the mushroom valve carrier O ring and the groove around the mushroom valve carriers Lightly lubricate and refit new O rings e Inspect the mushroom valve and mushroom valve carrier for damage Wash sanitize and remove any debris from the carrier e Clean the mushroom valve carrier O ring and the groove around the mushroom valve carriers Lightly lubricate and refit the O rings e Refit the mushroom valves to the carriers El DANGER DO NOT put lubricant on the mushroom valves e Having cleaned and sanitized the BOV press the valve carriers into the BOV Ensure the O rings around the mushroom valve carriers have not extruded out of their grooves El DANGER Check the flow in the BOV It should be from the diver s left to diver s right with the mouthpiece in the diver s mouth Fig 2 19 e Inspect and clean the rubber mouthpiece Refit with a tight cable tie Rem
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