GDS GASMAX TX User Manual
Contents
1. PHS Sop Gas and Flame Detection Operation and Maintenance Manual GASMAX TX Battery Powered Dual Channel Wireless Gas Monitor AUTHORIZED DISTRIBUTOR GasDetectorsUSA com Houston Texas USA sales GasDetectorsUSA com 832 615 3588 GASMAX TX Operation amp Maintenance Manual Revision 1 0 CAUTION FOR SAFETY REASONS THIS EQUIPMENT MUST BE OPERATED AND SERVICED BY QUALIFIED PERSONNEL ONLY READ AND UNDERSTAND INSTRUCTION MANUAL COMPLETELY BEFORE OPERATING OR SERVICING ATTENTION POUR DES RAISONS DE SECURITE CET EQUIPEMENT DOIT ETRE UTILISE ENTRETENU ET REPARE UNIQUEMENT PAR UN PERSONNEL QUALIFIE ETUDIER LE MANUE D INSTRUCTIONS EN ENTIER AVANT D UTILISER D ENTRETENIR OU DE REPARER L EQUIPEMENT REVISION HISTORY Revision 1 0 8 1 13 Initial Release updated 11 22 13 Copyright 2013 GDS Corp All Rights Reserved P N 1200 0863 02 Page 2 GASMAX TX Operation amp Maintenance Manual Revision 1 0 1 SAFETY INFORMATION 8 2 GENERAL INFORMATION 9 3 SPECIFICATIONS 10 4 OPERATION 5 WIRELESS SYSTEM BASICS 14 System Architecture 14 Transmission Distance 15 Monopole and collinear Omni Directional antennas 16 YAGI Directional Antennas 17 Coaxial Cables 17 Surge Protection amp Grounding 18 6 HARDWARE OVERVIEW 19 7 INSTALLATION 21 Locating the GASMAX TX 21 Mounting the GASMAX TX 21 Power and Signal Wiring 22 Connecting a Remote Antenna 22 Connecting A GASMAX TX Remote Sens2. followed by a second layer of self vulcanizing weatherproofing tape 1000 2314 with a final layer of electrical PVC tape USE IN HAZARDOUS AREAS The GASMAX TX enclosure and sensor head with integral flame arrestor are certified for use in Class 1 Division 1 hazardous areas When combined with the optional XX Class Division 1 antenna coupler the entire device is suitable for use in Class 1 Division 1 areas The standard 10 0295 antenna coupler is designed to meet Class Division 2 hazardous area standards but is not 3 party certified GASMAX TX detectors with sensor heads for reactive gases without flame arrestors should not be installed in hazardous areas Page 24 GASMAX TX Operation amp Maintenance Manual Revision 1 0 POWER ON AND USER INTERFACE To turn on the GASMAX TX hold the magnetic wand over the UP ON key TO TURN ON HOLD for several seconds The welcome screen will appear followed by the MAGNET OVER UP ON KEY sensor information screen The GASMAX TX will then enter a predefined FOR SEVERAL SECONDS warm up delay period to allow the sensor to stabilize If the unit does not power up properly check for a loose battery connection or dead battery NOTE GDS CORP RECOMMENDS APPLYING POWER TO THE GASMAX TX AFTER THE SITE MANAGER SYNCHRONIZING BEACON SIGNAL IS ACTIVE BATTERY LIFE IS REDUCED IF THE GASMAX TX IS ON FOR LONG PERIODS WHILE UNABLE TO COMMUNICATE TO THE MASTER DEVICE Figure 8 1 GAS
3. in range condition TX COUNT keeps track of the number of data packets sent by the GASMAX TX The counter is 32 bit binary and can count up to 4 2 million transmissions RF HANDSHAKING determines whether the remote receiver is expected to return a data received message If set to OFF the GASMAX TX broadcasts the same packet three times in quick succession If set to ON the GASMAX TX broadcasts a single copy of the data packet and waits for a reply from the system server NOTE RF HANDSHAKING SHOULD ONLY BE USED IF THERE IS JUST ONE RECEIVER IN THE NETWORK DEVICE SETUP CLOCK DELAY SETUP RF Link Setup 13 41 00 Clock Delays 19 15 1232 Security Warm Up Sec 60 LCD Contrast Cal Purge Sec 60 Turn Power OFF Reset Range Icon Figure 11 10 Clock Delay Menu The GASMAX TX is equipped with a crystal controlled battery backed real time clock that maintains local Time and Date These values are factory preset to US Central Time and should be reset to correctly match the current time zone during installation to make sure that time stamped Event Log entries are correct TIME adjusts time of day in hours minutes and seconds Time is entered in 24 hour format The GASMAX TX will not adjust the clock to compensate for Daylight Savings Time Page 42 GASMAX TX Operation amp Maintenance Manual Revision 1 0 DATE adjusts date in month day and two digit year WARM UP DELAY sets the amount of time from pow
4. 18 18 YES 902 928 MHz 2 402 2 478 GHz No S 19 19 YES 902 928 MHz 2 402 2 478 GHz No T 20 20 YES 902 928 MHz 2 402 2 478 GHz No U 21 21 YES 902 928 MHz 2 402 2 478 GHz No 22 22 YES 902 928 MHz 2 402 2 478 GHz No W 23 23 YES 902 928 MHz 2 402 2 478 GHz No X 24 24 YES 902 928 MHz 2 402 2 478 GHz No Y 25 25 YES 902 928 MHz 2 402 2 478 GHz No Z 26 26 YES 902 928 MHz 2 402 2 478 GHz No Figure 15 1 GDS Corp Network Identifiers Page 50
5. and press EDIT Use NEXT to exit a menu MAIN MENU CHI ACTIVE DISABLED CH2 ACTIVE DISABLED Device setup Help s Batt 3 62V 81 00 CHANNEL X Channel ENABLED Configure Readout Alarm Settings Sensor Information Technicians Only Sensor Temp 29 0 DEVICE SETUP RF Link Setup Clock Delays Security Raw LCD Contrast Turn Power OFF Reset Range Icon CHX CONFIG PG1 2 e Meas U Name Eunits ppmH2S Zero 0 Span 100 Decimal Points Cal Span value Readout Deadband Track Negative Backup Config Restore Config Load Defaults ALARM SETTINGS ALARM 1 ALARM 2 ALARM 3 Fault SMART SENSOR Type Span Zero ppmH2s 100 0 0 0 SN Bo 513091900003 rn on 09 03 13 Last Cal 11 13 13 NEXT key to exit TECHNICIANS MENU mSet Gain to Unity PreAmp Gain Set Zero Cal Value Raw Min Counts Raw Max Counts RF Link Test 0 0 800 4000 L A D Counts 805 2 4 GHz Radio mNetwork ID Remote ID Wakeup Timer TX TX RF TX Retries Config Time Link Status cnt 0x00002F80 RF Handshaking OFF RF Link Wavecast CLOCK DELAY SETUP Time 13 41 00 Date 11 14 14 Warm Up Sec Cal Purge Sec SYSTEM SECURITY Contact Name Secure Level LOW Pass Code XXXX UNLOCKED CONTRAST UP DOWN to change Next to Exit kkkk WARNING kkkk TURNING OFF POWER EDIT to Accept NEXT to Abort ALARM X SETUP Set Point 20 0 Deadband 1 Low Trip NO unit
6. be replaced GASMAX TX monitors use GDS Corp type 10 97xx electrochemical sensors or ultra low power infrared sensors where the XX is the gas type shown in Specifications The range value should also be specified when ordering replacement sensors For example a replacement H2S sensor for 0 100 ppm would be 10 9715 R0100 To replace a sensor follow these steps 1 Turn off the GASMAX TX by accessing the Device Setup Turn Power Off menu or holding the magnet over the NEXT key until the display shows EDIT at Accept then pressing the EDIT key 2 Unscrew the sensor head cover If unable to open the cover by hand use a Sensor Head Replacement Tool p n 10 0187 3 Remove the old sensor by pulling straight down NOTE DO NOT TRY TO UNSCREW THE SENSOR PULL STRAIGHT DOWN 4 Carefully install the replacement sensor by aligning the arrow on the sensor with the arrow engraved on the sensor head Push straight up until the sensor connector seats firmly into the connector 5 Reinstall the sensor head cover by CAREFULLY screwing the cover onto the sensor head NOTE IF THE SENSOR FALLS OUT OF THE SENSOR HEAD DURING THIS STEP IT CAN BE DAMAGED USE CAUTION WHEN REINSTALLING THE SENSOR HEAD COVER 6 Turn the GASMAX TX ON by holding the magnet over the UP ON key until the welcome screen appears on the display ET ET ET 21 REMOVE OLD SENSOR 3 INSTALL NEW SENSOR PULL STRAIGHT DOWN ALIGN ARROWS PUSH STRAIGHT UP 1 UNSCREW SENSO
7. configured as the beacon server This device transmits a modulated carrier signal that all other radios use to synchronize their frequency hopping pattern Knowledge of the selected hopping pattern programmed into the radio and synchronization data from the beacon enables each radio to know when to transmit and on what frequency Multiple networks can exist in the same frequency band so long as their choice of pseudorandom hopping pattern is unique GASMAX TX monitors support 26 unique network identifiers Page 14 GASMAX TX Operation amp Maintenance Manual Revision 1 0 TRANSMISSION DISTANCE In order for reliable wireless communication to occur transmitter power output antenna gain and receiver sensitivity must exceed the free space loss attenuation experienced by radio signals as they travel between transmitter and receiver This gain or loss is measured in decibel milliwatts dBm and is a function of both distance and frequency Typical free space loss at 900 MHz is 71 dBm at 300 ft 100 meters and 91 dBm at 3000 ft 300 meters and for 2 4 GHz the free space loss is 80 dBm at 300 ft 100 meters and 100 dBm at 3000 ft 1000 meters 2 4GHz 1 1000m lA Antenna Free Space Antenna Gain 3 dBm Loss Gain 3 dBm A 102 dBm mM SSA RF Power 23 21 dBm Receiver Sensitivity 95 dBm Figure 5 2 RF Transmission Margin In a typical 2 4 GHz
8. system shown above for example the transmitter power output is 21 dBm each antenna provides an additional gain of 3 dBm and the receiver sensitivity is 95 dBm Therefore the total system gain is 21 3 3 95 122 dBm Since a reliable system requires a margin of 20 dBm this system will work if the free space loss between the transmitter and receiver is less than 102 dBm suggesting a distance of approximately 1000 meters However this calculation does not take into account additional loses due to intervening structures or foliage To minimize free space loss the combined height of the transmitter antenna and receiver antenna should exceed the diameter of the RF Transmission Zone see Fig 5 3 and at least 60 of the area inside the zone should be free of obstacles Although both 900 MHz and 2 4 GHz signals can travel around or through most towers or buildings structures such as large metal tanks or solid metal buildings may attenuate the signal to the point where reception is marginal Raising the antenna at either end of the path will improve signal strength and reduce transmission errors GDS Corp recommends placing the GASMAX TX at least 5 feet above the surrounding terrain and even more if possible However note that the standard antenna transmits its maximum signal strength in a relatively flat donut shaped pattern which may affect the performance of GASMAX TX monitors located in close proximity to an elevated C2 TX S
9. will always cause the Fault alarm to trip BACKUP CONFIG allows users to store the entire current GASMAX TX menu database into non volatile memory for restoration later if incorrect values are accidentally entered or uploaded RESTORE CONFIG restores the GASMAX TX menu database to the values from the most recent Backup Config The special keystroke sequence of 4 consecutive UP keys is also required to perform backup and restore operations LOAD DEFAULTS restores factory default settings CHANNEL xX Channel ENABLED ALARM SETTINGS ALARM x SETUP Configure Readout Alarm Settings ALARM 1 Set Point 2080 Sensor Information ALARM 2 o Deadband 1 0 Technicians only ALARM 3 Low Trip NO Sensor Temp 29 0C Fault Units ppm H2S Figure 11 3 Alarm Settings Menu The Alarm Settings page covers the Alarm 1 2 and 3 menuitems Alarm 1 Alarm 2 Alarm 3 and Fault menus are identical and are therefore described only once in this section For the GASMAX TX the alarm settings not only control the status of the indicator LEDs but also cause alarm conditions to occur in the GDS 95 Wireless Alarm Station and C2 TX Wireless Site Monitor SET POINT enters the engineering unit value where the alarm trips It may be negative and trip when monitored values fall out of range in this direction Fault has a default setting of negative 10 with Low Trip set for YES It is important to adjust this value when the transmitter s span value is set for another va
10. Dioxide 0 100 ppm 10 9718 Hydrogen Fluoride 0 5 ppm 10 9730 Mercaptan 0 50 mg m3 10 9719 Sulfur Dioxide 0 500 ppm 10 9731 Tetrahydrothiophene 0 50 mg m3 10 9720 Ammonia 0 1000 ppm 10 9732 Diborane 0 1 ppm 10 9721 Ozone 0 1 ppm 10 9733 Hydrogen Sulfide Low RH 0 100 ppm Page 10 GASMAX TX Operation amp Maintenance Manual Revision 1 0 The GASMAX TX wireless gas monitor is designed to detect dangerous levels of toxic or hydrocarbon combustible gases and transmit that information to a GDS Corp remote site manager or controller receiver The GASMAX TX uses the new highly integrated 10 97xx series ultra low power infrared or zero power electrochemical Smart Sensors that allow each sensor to be individually optimized for the target gas range and environmental conditions Sensor Digital Output ZZZ 800 counts 0 1 2 High Resolution 4000 counts 100 LCD Display L Data Transmission to WSM i User Interface amp System Control PGA Gain Adjustment Sensor i Amplifier 1 900 MHz or Sensor Element 2 4 GHz Radio T Central Processor Toxic or Combustible Gas Process Alarms Gain amp Offset Apply Calibration O v Re ER BD S Z 32 JE w D I E Qu 3 6V Battery Figure 4 1 GASMAX TX Block Diagram Toxic gases entering the sensor head react with the electrolyte
11. MAX TX Display The GASMAX TX display is shown in Figure 8 1 There are four magnetic switches on the face of the GASMAX TX arranged in a quadrant around the LCD display labeled NEXT EDIT DOWN CAL and UP ON To activate or press a magnetic switch swipe the magnet near the switch To access the Main Menu press the EDIT key while in display mode Pressing the NEXT key causes the GASMAX TX display to switch display screens between DATA and TREND displays Activating DOWN CAL followed by EDIT while in display mode initiates Calibration Mode The EDIT key activates the USER MENU display mode When in user menu display mode use UP and DOWN to select an item EDIT to change an item and NEXT to exit the menu or function and return the GASMAX TX to display mode For the balance of this manual the term press will be used to describe activation of any key via the magnetic wand See Chapter 11 for a detailed description of the User Menu All that is necessary to integrate a GASMAX TX into a GDS Corp wireless network is to select the Network Identifier and Device ID Each device in any given GDS Corp wireless network should have the same Network Identifier and each GASMAX TX should have a different Device ID To access the necessary menu press EDIT and select the Device Setup RF Link Setup Menu See Figure 8 2 for a step by step procedure to integrate multiple GASMAX TX devices with a C2 TX Wireless Sit
12. R DO NOT ROTATE 4 CAREFULLY REATTACH HEAD COVER SENSOR HEAD COVER Figure 10 3 GASMAX TX Sensor Replacement Page 34 GASMAX TX Operation amp Maintenance Manual Revision 1 0 Local Smart Sensors are automatically recognized by the GASMAX TX and the Smart Sensor information screen should appear immediately after the installation of a local Smart Sensor If the sensor is the same gas type as was previously installed the sensor s calibration data will be uploaded into the GASMAX TX All other parameters stored in the GASMAX TX will be retained GASMAX TX units can be reconfigured for different sensors by simply installing a different type compatible sensor If a new sensor TYPE is installed the Smart Sensor identification screen will appear followed by the SENSOR MISMATCH message and the user will be given the opportunity to confirm the new sensor type If the user activates the EDIT key all data stored in the new sensor s database including range tag name cal span value engineering units and alarm levels will replace the current settings SENSOR REPLACEMENT REMOTE SENSORS To replace a remote sensor follow these steps 1 Turn off the GASMAX TX by accessing the Device Setup Turn Power Off menu or holding the magnet over the NEXT key until the display shows EDIT at Accept then pressing the EDIT key 2 Unscrew the remote sensor head cover If unable to open the cover by hand use a Sensor Head Repla
13. RO Cal OK If SPAN Cal Fails If SPAN Cal OK show for 2 seconds show for 5 seconds REPEAT CAL REPEAT CAL SFAH CAL ZERO FAIL ZERO CAL SPAN FALL Successfu Successful Sensor Life GASMAX TX Operation amp Maintenance Manual Revision 1 0 DATA DISPLAY SCREEN The DATA display screen shows real time channel value information in calibrated engineering units A horizontal bar graph tracks the current value and shows the Alarm 1 and Alarm 2 values in graphical form In single channel display mode user programmable Engineering Units Eunits and Measurement Name text strings are shown below the real time reading Alarm LEDs Flash when active Wireless Status Icon Calibrated Gas Value Engineering Units Bargraph Figure 10 1 GASMAX TX Data Display Screen A Wireless Status Icon appears in the upper left corner of the data display screen to indicate the status of the wireless interface The information shown includes 777 Indicates that the GASMAX TX microprocessor is in low power sleep mode Ru Indicates that the GASMAX TX microprocessor is awake and reading the sensor data RNG Indicates that the GASMAX TX is trying to synchronize with the beacon P Indicates that the beacon was successfully detected and that a data transmission is in progress Indicates that the beacon signal was not received during the most recent attempt to transmit data The GASMAX TX will not attempt to tra
14. SERVER and verify GASMAX TX Server in Range icon displayed RF signal attenuated Check C2 TX WSM antenna connection cable and remote antenna if installed Place 8 GASMAX TX in close proximity with the C2 TX WSM and check for proper operation Page 46 GASMAX TX Operation amp Maintenance Manual Revision 1 0 DISPLAY amp ENCLOSURE Display 10 0404 GASMAX TX Display no radio 1000 2188 900 MHz radio module 1000 2454 2 4 GHz radio module Antenna Coupler 10 0295 Antenna coupler RP TNC 1200 0482 C1D1 rated antenna coupler Yellow Enclosure 10 0160 GASMAX Enclosure Battery PCB 10 0407 Battery PCB 1000 2721 Replacement 3 6V Battery Sensor Head Assembly 10 0247 For standard gases 10 0247F For reactive gases Note Does not include sensor Figure 13 1 GASMAX TX Local Sensor Spare Parts Page 47 GASMAX TX Operation amp Maintenance Manual Revision 1 0 SENSOR HEAD ACCESSORIES Sensor Head Splash Guard 10 0198 Splash Guard Fits all sensor heads 1 C TTT 1 Sensor Head Flow Cell 10 0205 Flow Cell 1 8 NPT compression fittings 10 02055 Other specify Splash Guard Flow Cell Figure 13 2 GASMAX Sensor Head Splash Guard amp Flow Cell SENSOR SEPARATION KIT Remote Sensor Head Assembly 20 0162 Remote Toxic Combustible 20 0123 Remote Toxic Reactive Gas Note Does not include sensor Figure 13 3 GASMAX TX R
15. SET MENU 1 ENNEN 40 FIGURE 12 8 RE LINK TEST MENU An ankre raTa ons 41 FIGURE 11 9 RADIO SETUP MENU 2 4 GHZ nonin onni otteisiin nanka Raag 4 44 41 FIGURE 11 10 CLOCK DELAY MENU 42 FIGURE 11 11 SECURITY MENU vi scctects ECTS ENEE SEENEN 43 FIGURE 11 12 LCD CONTRAST MENT E eR 43 FIGURE 11 13 POWER OFF MENU 7 eege geed 44 FIGURE 13 1 GASMAX TX LOCAL SENSOR SPARE PARTS 47 FIGURE 13 2 GASMAX SENSOR HEAD SPLASH GUARD amp FLOW CELL 48 Page 6 GASMAX TX Operation amp Maintenance Manual Revision 1 0 FIGURE 13 3 GASMAX TX REMOTE SENSOR SEPARATION KIT FIGURE 14 1 GASMAX TX DIMENSIONS SINGLE LOCAL SENSOR AAA FIGURE 15 1 GDS CORP NETWORK IDENTIFIERS eee eee Page 7 GASMAX TX Operation amp Maintenance Manual Revision 1 0 Important Read Before Installation Users should have a detailed understanding of GASMAX TX operating and maintenance instructions Use the GASMAX TX only as specified in this manual or detection of gases and the resulting protection provided may be impaired Read the following WARNINGS prior to use WARNINGS e The GASMAX TX gas monitor described in this manual must be installed operated and maintained in acco
16. a packet transmission under the following specific conditions e Every time the Wakeup Timer expires irrespective of the gas level present This allows controller receivers to confirm the presence of the gas monitor or issue a COMM ERROR is no transmission is received in a fixed interval default is 18 minutes but can be adjusted by the user e IF the new reading exceeds the Alarm 1 Alarm 2 or Alarm 3 programmed value A sensor FAULT reading does not initiate a transmission but will be broadcast on the Wake Up timer interval e Ifthe reading rises or falls by more than 2 of full scale as compared to the last reading e Upon entry into CAL mode a packet containing a gas value of 300 counts 15 6 of scale is transmitted to indicate IN CAL for the current channel e Upon entry into CAL PURGE mode a value of 800 counts 0 of scale is transmitted for all sensors except oxygen sensors where a value of 3475 counts 83 6 of scale is transmitted 9 Holding the magnetic wand over the UP key until the Data Transmission icon appears Page 32 GASMAX TX Operation amp Maintenance Manual Revision 1 0 e At the end of the initial Warm Up interval e Any time menu items are edited and again upon returning the display to readings mode OPTIMIZING BATTERY LIFE The 3 6v lithium battery in the GASMAX TX should last between six and 12 months under normal conditions if gas is only occasionally present To optimize battery life co
17. aining additional information that includes zero and span values user programmed tag and engineering unit values and communications timeout settings Third generation controllers such as the C2 TX Wireless Site Manager process and display this information eliminating the need to program both the gas monitor and site manager or controller NOTE GDS CORP WIRELESS GAS DETECTORS CAN ONLY COMMUNICATE WITH PROPERLY EQUIPPED GDS CORP CONTROLLERS OR WIRELESS SYSTEM SITE MANAGERS If the GASMAX TX determines that a data packet should be transmitted the following events take place Power is applied to the radio the radio is placed in receive mode and listens for the synchronization beacon transmitted by the site manager or controller receiver If the beacon is found the radio synchronizes to the beacon hopping pattern transmits the data packet and returns to sleep mode This sequence takes between 250 milliseconds and 1 second to complete If the radio fails to synchronize with the beacon it waits 2 seconds and tries again then waits 2 seconds and tries once more If the third attempt fails an Out of Range icon is displayed and the GASMAX TX goes to sleep until the next six second interval occurs The Out of Range event will be logged in the Event Log FHSS radios for both 900 MHz and 2 4 GHz are available For North America 900 MHz is recommended due to increased power output available up to 1 watt greater range and ability of lowe
18. ally transmitted to the C2 TX Wireless Site Manager eliminating redundant setup and minimizing programming errors Key features e Single or dual channel toxic and or combustible using new Ultra Low Power Infrared for Combustibles and Carbon Dioxide e Six to 12 month battery life on one replaceable 3 6VDC Lithium battery e Tightly integrated 900MHz or 2 4 GHz radios with Frequency Hopping Spread Spectrum FHSS for maximum range e Automatic sensor recognition and setup with GDS Corp Smart Sensors e Large LCD shows values bar graph and RF interface e User prompted calibration procedure 9 Power on Power off using magnetic wand no need to open the enclosure e Suitable for use in Class Division 1 Hazardous Areas with XP rated antenna coupler Page 9 GASMAX TX Operation amp Maintenance Manual Revision 1 0 Power Disposable 3 6v Lithium lon battery D size Display 64 x128 pixel LCD with engineering units bargraph and 30 minute trend Ch 1 Input Digital input from local or remote type 10 97xx toxic or infrared sensors Ch 2 Input Digital input from local or remote type 10 97xx toxic or infrared sensors Accuracy 5 of full scale typical over temperate range Output Gas concentration represented by a wirelessly transmitted numeric value between 800 counts 0 of scale and 4000 counts 100 of scale one data value
19. ansmits with vertical polarity In networks spread over wide areas it is common for a central receiver controller to have an omni directional antenna such as a collinear and the remote GAMAX TX monitors to have Yagi directional antennas In this case as the omni directional antenna will be mounted with vertical polarity then the Yagi s must also have vertical polarity see Fig 5 3 Care needs to be taken to ensure the Yagi is aligned correctly to achieve optimum performance Two Yagi antennas can be used for a point to to link In this case they can be mounted with the elements horizontally to give horizontal polarity There is a large degree of RF isolation between horizontal and vertical polarity 30dB so this installation method is recommended if there is a large amount of interference from another system close by transmitting in vertical polarity Always mount YAGI antennas with the primary elements oriented in the same direction as any omnidirectional antennas in the same system Figure 5 4 Vertically Polarized Omni Directional and YAGI Antennas COAXIAL CABLES When installing a coaxial cable between the GASMAX TX and a remote antenna constructing a loop of cable below the antenna is always recommended The loop allows water to drip off the bottom of the U Page 17 GASMAX TX Operation amp Maintenance Manual Revision 1 0 instead of into the connection reduces installat
20. as detector reading xx Repeat for Each GASMAX TX Repeat for each GASMAX TX 12 Program relays and alarm conditions for desired outputs Perform end to end test using calibration or test gas Figure 8 2 Step by Step Setup Checklist Page 26 GASMAX TX Operation amp Maintenance Manual Revision 1 0 After power up allow the GASMAX TX to stabilize for one to eight hours prior to any initial calibration see GDS Corp Electrochemical Sensor manual for more details on specific electrochemical sensors This will allow the sensor to reach stable equilibrium with respect to environmental conditions such as ambient temperature humidity and barometric pressure as well as applied reference and counter voltages generated by the GASMAX TX electronics At this point the GASMAX TX can be calibrated and made operational INITIAL SETUP LEGACY MODE Additional information will be available in a future version of the GASMAX TX manual Page 27 GASMAX TX Operation amp Maintenance Manual Revision 1 0 CALIBRATION OVERVIEW Calibration is critically important to ensure correct operation of the GASMAX TX The built in CAL MODE function is designed to make calibration quick easy and error free a successful ZERO and SPAN calibration requires only four keystrokes When entering CAL MODE the GASMAX TX automatically transmits a data packet containing a value of 300 counts 15 6 of scale t
21. cement Tool p n 10 0187 3 Remove the old sensor by pulling straight down NOTE DO NOT TRY TO UNSCREW THE SENSOR PULL STRAIGHT DOWN 4 Carefully install the replacement sensor by aligning the arrow on the sensor with the arrow engraved on the sensor head Push straight up until the sensor connector seats firmly into the sensor connector 5 Reinstall the sensor head cover by CAREFULLY screwing the cover onto the sensor head NOTE IF THE SENSOR FALLS OUT OF THE SENSOR HEAD DURING THIS STEP IT CAN BE DAMAGED USE CAUTION WHEN REINSTALLING THE SENSOR HEAD COVER 6 Turn the GASMAX TX ON by holding the magnet over the UP ON key until the welcome screen appears on the display NORMAL MAINTENANCE Normal maintenance for the GASMAX TX primarily involves battery replacement and periodic calibration on standard intervals GDS Corp recommends calibration at least every three months or more often if temperature extremes vibration the presence of incompatible gases or other environmental factors may accelerate the deterioration of the sensor element Calibration should also include inspections for clogged or wet sensor heads cracked or damaged enclosures and water incursion inside conduit or junction boxes Page 35 GASMAX TX Operation amp Maintenance Manual Revision 1 0 The GASMAX TX Main Menu tree is shown below To access the Main Menu swipe the magnetic wand over the EDIT key Use the UP and DN keys to select an item
22. d close to an elevated central antenna Page 21 GASMAX TX Operation amp Maintenance Manual Revision 1 0 POWER AND SIGNAL WIRING The GASMAX TX is completely self contained Power is provided by the internal 3 6V battery and output data is sent entirely via wireless transmission from the local or remote antenna 52 Local Sensor Channel 2 S1 Local Sensor Channel 1 NOTE REPLACE ONLY WITH P N 1000 2721 LITHIUM BATTERY Fotz EO IMPORTANT OBSERVE POLARITY WHEN REPLACING BATTERY 2 Connects I O Battery Board to Display Module OOGO Old gt Q S259 TB 1 Remote Sensor Channel 1 TB 2 Remote Sensor Channel 2 Figure 7 1 GASMAX TX I O Battery Board The multi pin interface cable from local senor heads connects to S1 for channel 1 and to S2 for channel 2 Four wire sensor extension cables for remote sensors connect to TB 1 for channel 1 and to TB 2 for channel 2 When replacing the battery be careful to double check the polarity before installing Reversing the polarity will damage the internal electronics CONNECTING A REMOTE ANTENNA Additional information on remote antennas will be available in a future version of the GASMAX TX manual Page 22 GASMAX TX Operation amp Maintenance Manual Revision 1 0 CONNECTING A GASMAX TX REMOTE SENSOR The GASMAX TX remote sensor consists of a cast aluminum explosion proof junction box stainless
23. e Manager To turn the GASMAX TX OFF access the Device Setup Turn Power Off menu or hold the magnet over the NEXT key until the display shows EDIT to Accept and then press the EDIT key Page 25 GASMAX TX Operation amp Maintenance Manual Revision 1 0 SETTING UP THE GASMAX TX AND C2 TX WIRELESS SITE MANAGER To successfully setup a wireless network perform the following steps in order GASMAX TX Gas Monitor C2 TX Wireless Site Manager 1 Apply AC or DC power to the C2 TX Wireless System Manager 2 Select the desired network identifier A through 2 3 If the C2 TX is the primary or only controller in the network select RF Mode Server 4 If using 900 MHz radios set the desired transmit power output 5 Enable the desired number of wireless channels in the C2 TX WSM 6 Turn on the GASMAX TX by holding a magnetic wand over UP ON key for several seconds 7 Configure the network identifier AT thru Z to match that chosen for the C2 TX WSM or system controller Find in Device Setup RF Link 8 Configure the RTU device ID for a unique value Find in Device Setup RF Link 9 Program channel tag name if desired Find in Channel Setup 10 Select C2 TX channel and set Remote Address to match device ID on GASMAX TX 11 Hold magnetic wand over UP key to force initial Confirm reception of wireless transmission transmission and valid g
24. e and should be replaced GASMAX TX EXHIBITS UNUSUAL OR UNEXPECTED BEHAVIOR Reload sensor defaults see Perform a Cold Boot to re initialize the entire system To perform a Cold Boot hold the magnet over the UP ON key until the display reads Release Key then slide the magnet over the EDIT key NOTE COLD BOOT CLEARS ALL DEVICE SETTINGS INCLUDING NETWORK IDENTIFIER AND DEVICE ID BE SURE TO RECORD THESE VALUES BEFORE PERFORMING THE COLD BOOT PROCEDURE GASMAX TX DISPLAY BLANK Turn the GASMAX TX on by holding a magnetic wand over the UP ON key Open enclosure and inspect battery for proper installation Replace battery NOTE BE SURE TO OBSERVE PROPERLY POLARITY GASMAX TX AND C2 TX WIRELESS SITE MANAGER DISPLAYED VALUES DON T MATCH Verify viewing proper channel Verify C2 TX device ID and GASMAX TX device ID match Page 45 GASMAX TX Operation amp Maintenance Manual Revision 1 0 WIRELESS SITE MANAGER DISPLAYS COMM ERROR FOR A SINGLE GASMAX TX Network Identifier does not match GASMAX TX device ID and WSM assigned channel device ID do not match Distance between gas monitor and WSM too great for reliable communications WSM beacon not set for SERVER if primary network manager Antenna connection compromised or antenna broken WIRELESS SITE MANAGER DISPLAYS COMM ERROR FOR ALL GASMAX TX Network Identifiers do not match No synchronizing beacon signal Verify C2 TX RF Mode
25. emote Sensor Separation Kit Page 48 GASMAX TX Operation amp Maintenance Manual Revision 1 0 15 1 with 900 MHz antenna 19 2 with 2 4 GHz antenna Figure 14 1 GASMAX TX Dimensions Single Local Sensor Page 49 GASMAX TX Operation amp Maintenance Manual Revision 1 0 The set of Network Identifiers used by the GASMAX TX specify a combination of frequency hopping pattern frequency band System ID value and whether or not the data is encrypted using a proprietary software based algorithm NETWORK Hop System Data 900 MHz 2 4 GHz Legacy ID Pattern ID Encrypted Band Band Compatible A 1 1 No 902 928 MHz 2 402 2 478 GHz Yes B 2 2 No 902 928 MHz 2 402 2 478 GHz Yes C 3 3 No 902 928 MHz 2 402 2 478 GHz Yes D 4 4 No 902 928 MHz 2 402 2 478 GHz Yes E 5 5 No 902 928 MHz 2 402 2 478 GHz Yes F 6 6 No 902 928 MHz 2 402 2 478 GHz Yes G 7 7 No 902 928 MHz 2 402 2 478 GHz Yes H 8 8 No 902 928 MHz 2 402 2 478 GHz Yes 9 9 No 902 928 MHz 2 402 2 478 GHz Yes J 10 10 No 902 928 MHz 2 402 2 478 GHz Yes K 11 11 No 902 928 MHz 2 402 2 478 GHz Yes L 12 12 No 902 928 MHz 2 402 2 478 GHz Yes M 13 13 YES 902 928 MHz 2 402 2 478 GHz No N 14 14 YES 902 928 MHz 2 402 2 478 GHz No o 15 15 YES 902 928 MHz 2 402 2 478 GHz No P 16 16 YES 902 928 MHz 2 402 2 478 GHz No Q 17 17 YES 902 928 MHz 2 402 2 478 GHz No R
26. er on until the 4 20mA output signal begins to track the sensor output Default setting is 60 seconds Maximum value is 255 seconds CAL PURGE DELAY sets the amount of time from the completion of span calibration until the 4 20mA output signal restarts tracking the sensor output The default setting is 60 seconds and the maximum value is 255 seconds DEVICE SETUP RE Link Setup Clock Delays Security SYSTEM SECURITY Contact Name Secure Level LOW Pass Code LCD Contrast XXXX Turn Power OFF UNLOCKED Reset Range Icon Figure 11 11 Security Menu CONTACT NAME is a 12 character ASCII field available for displaying a phone or name of personal who knows the Pass Code Lost Pass Codes may be recovered by entering the locked security menu and holding the UP key for 5 seconds The 4 digit code appears near the bottom of the screen SECURE LEVEL sets LOW HIGH or OFF modes A LOW level allows CAL MODE sensor calibrations but requires the 4 digit Pass Code prior to altering menus HIGH level locks the entire menu database and the CAL Mode until the correct Pass Code is entered LOW and HIGH security levels always allow static viewing of configuration menus DEVICE SETUP RF Link Setup Clock Delays CONTRAST Security UP DOWN to change LCD Contrast Next to Exit Turn Power OFF Reset Range Icon Figure 11 12 LCD Contrast Menu LCD CONTRAST Select the LCD contrast command and use the UP or DOWN to adjust the con
27. he 24 MIN sensor opening from below Be sure to leave sufficient room below the 2 4 GHz sensor head to allow easy access for attachment of a Calibration Cup and 6 MIN or removal of the sensor head cover for sensor replacement Whenever possible the GASMAX TX should be mounted in a location that provides clear line of sight between the gas monitor and receiving antenna Both 900 MHz and 2 4 GHz signals will travel through masonry or wooden structures with minimal loss however large metal buildings tanks and other solid structures will block the signal or attenuate the transmission to the point where reliable wireless communications may not be possible For 900 MHz radios power levels can be adjusted from 10 mW up to 1 0 watt higher power will reduce battery life In many cases GDS 95 Wireless 12 MIN for sensor replacement and Repeaters can be used to route wireless signals around obstacles calibraton Height above ground also affects wireless transmissions and raising the antenna at either end of the path will improve signal strength and reduce transmission errors GDS Corp recommends placing the central receiver antenna at least 10 feet about the surrounding terrain and even more if possible However note that standard vertical dipole antennas transmit their maximum signal strength in a relatively flat donut shaped pattern which may affect the performance of GASMAX TX monitors locate
28. ibration Zero Cal Value 0 0 will be erased Raw Min Counts 800 A Raw Max Counts 4000 T gt ES Ge RF Link Test GONE A D Counts 805 Figure 11 6 Set Unity Gain Menu SET GAIN TO UNITY sets the Gain and Offset values to 1 000 and 0 000 respectively This clears any previous calibration data and is useful in troubleshooting if sensor readings appear to be incorrect WARNING A FULL CALIBRATION SHOULD ALWAYS BE PERFORMED AFTER A SET GAIN TO UNITY COMMAND TECHNICIANS MENU PGA SETUP Gain to Unity PreAmp Gain Set 67 4 Zero Cal Value 0 0 Counts Raw Min Counts 800 Reading Raw Max Counts 4000 Up Dn to change RF Link Test NERT WO EE A D Counts 805 Figure 11 7 Preamp Gain Set Menu PREAMP GAIN SET Gas sensors have a very wide range of output levels and the PGA gain parameter is used to match the sensors output to the Smart Sensor s signal conditioning circuitry Each type of sensor has a nominal gain value that is preset at the factory Altering the PGA gain value resets the calibration Gain and Offset values to their default values of 1 000 and 0 000 The current PGA gain value is shown in percent and can be increased or decreased by pressing the UP or DOWN keys WARNING A FULL CALIBRATION SHOULD ALWAYS BE PERFORMED AFTER ANY CHANGE IN THE PREAMP GAIN SETTING Page 40 GASMAX TX Operation amp Maintenance Manual Revision 1 0 TECHNICIANS MENU READING ALM SIMULATE Set Ga
29. in the sensor to produce a small electrical output signal Electronics on the sensor board amplify the signal PGA Gain and covert the information from analog to digital using a 12 bit A D converter If an ultra low power infrared sensor is being used hydrocarbon gases enter the sensor and block the passage of infrared light from the IR source to the detector An integrated microprocessor in the infrared sensor linearizes the value and converts the output to digital IMPORTANT TOXIC SENSORS ARE SUBJECT TO ACCELERATED DETERIORATION IF POWER IS NOT APPLIED WITHIN 3 MONTHS OF SHIPMENT FROM GDS CORP Page 11 GASMAX TX Operation amp Maintenance Manual Revision 1 0 IMPORTANT THE GASMAX TX INFRARED SENSOR WILL NOT DETECT COMBUSTIBLE LEVELS OF HYDROGEN GAS Every six seconds the GASMAX TX central processor wakes up reads the sensor s digital output scales and converts the reading to engineering units applies correction factors based on the most recent calibration and displays the value on the LCD display Based on the gas concentration level and alarm levels programmed by the user the microprocessor then determines if a compact wireless data packet should be broadcast to the site manager or wireless controller receiver This data packet includes the gas value alarm and fault status bits and battery voltage At the conclusion of each Wakeup Timer interval the GASMAX TX also transmits a larger data packet cont
30. in to Unity Reading 0 PreAmp Gain Set Alarm 1 Zero Cal Value 0 0 Alarm 2 Raw Min Counts 800 Alarm 3 Raw Max Counts 4000 Fault 2 RE Link Test 5 Transmit Packet A D Counts 805 Figure 11 8 RF Link Test Menu RF LINK TEST The RF Link Test is a diagnostics tool which allows the user to cause the GASMAX TX to transmit simulated readings of 0 25 50 75 and 100 of scale without actually applying gas Checking the check box associated with each alarm setting can also be used to force the transmission of a data packet with the corresponding alarm bit set Select the value or alarm condition and select the TRANSMIT PACKET command to perform the function DEVICE SETUP MENU The Device Setup menu contains settings that are unique to the detector itself DEVICE SETUP 2 4 GHz Radio RF Link Setup Clock Delays Remote ID Security wakeup Timer LCD Contrast TX Retries Turn Power OFF TX Config Time 60m Reset Range Icon RF Link Status ad TX Cnt 0x00002F80 RF Handshaking OFF RF Link wavecast Figure 11 9 Radio Setup Menu 2 4 GHz The RF Link Setup menu is used to configure the radio modem in the GASMAX TX There are two similar menus one for 900 MHz radios and another for 2 4 GHz radios NETWORK ID may be set from A through Z and assigns the pseudo random radio frequency hopping pattern and system identifier A transmitter will not go In Range of or communicate with another transm
31. ing is stable approximately 1 minute press the EDIT key to complete the SPAN GAS calibration If the SPAN calibration is successful the display flashes REMOVE CAL GAS and starts the CAL PURGE delay Immediately shut off the regulator and remove the calibration cup At the end of the CAL PURGE delay the GASMAX EC output is re enabled and the unit is fully operational The flow chart shown in Figure 5 2 illustrates the above procedure UP CAL NEXT amp EDIT labels indicate keystrokes using the magnetic wand ZERO or SPAN calibration will fail if the readings exceed built in limits for maximum allowable zero or minimum allowable span NOTE A CAL MODE INFO SCREEN IS AVAILABLE TO VIEW CERTAIN CAL MODE PARAMETERS DURING CALIBRATION HOLD THE UP KEY FOR 5 SECONDS DURING CAL MODE TO DISPLAY THIS SCREEN DATA DISPLAY 2 a LEL D Measurenent Nane Hold UP key 5 sec CAL MODE info screen x use ta change SPAN GAS value and to see Offset Gain constants Hold UP key 5 sec Back to DATA ERROR CODE 4 ERROR CODE 5 Page 30 Figure 9 2 CALIBRATION FLOWCHART DISPLAY CAL then EDIT RET N NEXT KEY BEST eo NEXT REMOVE H live readina eunite gt live readingreunits N CAL GAS LEI EDIT to Set ZERO EDIT to Set SPAN HERT SPAN CAL Mode NEXT EXIT CAL Mode e X hane EDIT EDIT If ZERO Cal Fails If ZE
32. ion strain and provides spare cable length in case later the original connectors need to be replaced Avoid installing coax cables together in long parallel paths Leakage from one cable to another has a similar effect as mounting an antenna near another antenna SURGE PROTECTION amp GROUNDING Voltage surges primarily enter the GASMAX TX via the antenna connection as a result of electrical discharge in the atmosphere Electrical energy follows the most direct path to earth and the best protection is achieved by draining the surge energy to earth via an effective earth ground Wireless devices should have a solid connection to earth via a ground stake or ground grid if the soil has poor conductivity Solid connection means a large capacity conductor not a small wire with no coils or sharp bends All other devices connected to the GASMAX TX such as remote sensors should be grounded to the same ground point is possible There can be significant resistance between different ground points leading to very large voltage differences during lightning activity As many wireless units are damaged by earth potential surges due to incorrect grounding as direct surge voltage It is very difficult to protect against direct lightning strikes but the probability of a direct strike at any one location is very small Unfortunately power line surges and electromagnetic energy in the air can induce high voltage surges from lightning activity several mi
33. ite Manager or receiver controller Page 15 GASMAX TX Operation amp Maintenance Manual Revision 1 0 Combined Antenna Height Distance 900 MHz 2 4 GHz k 100 Ft 10 3m 6 2m RF Transmission Zone Ki 500 Ft 22 7m 15 Sm R 1000 Ft 30 10m 20 6 3000 Ft 54 17 1 N A Figure 5 3 RF Transmission Zone GDS Corp always recommends that a wireless survey be completed at the site to ensure the integrity of the wireless communications link Special care should be taken to account for moveable obstacles such as cranes railroad cars trucks containers and any other large structures that could end up being placed temporarily in a location that blocks the wireless signal MONOPOLE AND COLLINEAR OMNI DIRECTIONAL ANTENNAS Monopole rubber duck antennas are the most commonly used antennas for portable and semi portable equipment where extreme range or directional reception is required When mounted vertically they provide good omnidirectional reception and transmission from all horizontal directions and are generally rugged and when sealed properly against moisture can provide years of quality service Collinear antennas are more sophisticated and combine several vertical antennas that operate in parallel to increase signal gain by focusing the reception pattern in a more horizontal plane Rubber duck and collinear antennas provide best performance when installed with at least 1 t
34. itter operating with a different Network Identifier Different Network Identifiers can be used to prevent radios in one network from listening to transmissions of another Installations having more than one Server network should also have different Network Identifiers for each network Page 41 GASMAX TX Operation amp Maintenance Manual Revision 1 0 DEVICE ID may be set from 1 255 and acts as the device address for this particular GASMAX TX Controller channels receiving this monitor s data must also be configured with this matching Remote ID address WAKE UP TIMER determines how often the GASMAX TX sends a small data packet when there are no alarms present and when the gas level remains constant The interval can be set to a value between six seconds and 300 seconds default value Decreasing the wakeup timer will use more power and decrease battery life but allow remote receivers to determine a loss of signal condition more rapidly TX RETRIES allows up to 5 consecutive repeats of every transmission The default setting is 1 and should be increased only if there is no other way to establish a reliable transmission link TX CONFIG TIME determines how often the GASMAX TX transmits a large data packet that contains all the channel configuration parameters This interval can be set for a value between 15 and 60 minutes Default is 60 minutes RF LINK STATUS opens a special window that shows real time status for battery voltage and
35. les away Page 18 GASMAX TX Operation amp Maintenance Manual Revision 1 0 The GASMAX TX is a self contained battery operated single or dual channel gas detector with local or remote sensors The unit consists of an explosion proof enclosure sensor head if utilizing a local sensor antenna tuned for either 900 MHz or 2 4 GHz frequency bands a display module with microprocessor and radio and I O battery board that doubles as mounting hardware for the display The display attaches to the I O battery board via a short multi pin cable and two captive thumbscrews GASMAX TX Display Module 900 MHz or 2 5 GHz Antenna Radio Module on backside 3 6V Lithium Battery __ Multi pin cable I O Battery Board Figure 6 1 GASMAX TX with Single Local Sensor The GASMAX TX wireless gas monitor is capable of monitoring two separate sensors In certain cases it is appropriate to co locate both sensors in a local sensor configuration When doing so the GASMAX TX is configured with a Y adapter that supports two independent electrochemical or infrared sensors See Fig 5 2 Page 19 GASMAX TX Operation amp Maintenance Manual Revision 1 0 Four wire Sensor Data Cable up to 15 ft 3m in length GASMAX TX with Local and Remote Sensor Dual Local Sensors with Y Adapter Figure 6 2 GASMAX TX with Dual Sensors The GASMAX TX also supports remo
36. ller In legacy mode the required Hop Channel System ID and RTU Address values can be programmed to match an existing network and many of the benefits including magnetic Power On Power Off advanced 10 97xx sensor technology and additional transmission modes will still offer benefit to the user However when in legacy mode packet data that includes sensor range tag name and engineering units is not transmitted to the controller and must be manually entered in both the receiver controller and gas detector Page 13 GASMAX TX Operation amp Maintenance Manual Revision 1 0 SYSTEM ARCHITECTURE GDS Corp wireless uses discrete Frequency Hopping Spread Spectrum radios to communicate gas and alarm level information wirelessly between gas detectors and controllers FHSS radios transmit individual data packets using different discrete frequencies in a pseudorandom sequence Hop Pattern known to both transmitter and receiver Unlike Direct Sequence Spread Spectrum DSSS used for short distance 802 11 b g WiFi and certain mesh networks FHSS technology provides an ideal balance between power consumption transmission distance and resistance to interference Beacon Signal Constant jr Gas Data Packet As necessary pf Gas Data Packet As necessary Figure 5 1 GDS Corp Wireless System Architecture In each GDS Corp system one device is
37. lue other than 100 For example a typical span setting for monitoring oxygen level is 25 therefore the fault level value should be adjusted to 2 5 which is equal to negative 10 of full scale DEAD BAND has a minimum value of 1 and a maximum value of 10 It is useful for preventing alarm cycling when the monitored value is hovering around the set point EXAMPLE With a range of 0 100 ppm if deadband equals 5 and the set point is 20 ppm after tripping at 20 ppm the value must drop below 15 ppm to reset LOW TRIP set to YES causes the alarm to trip as the value falls below the set point Page 38 GASMAX TX Operation amp Maintenance Manual Revision 1 0 CHANNEL X SMART SENSOR s Channel ENABLED Type ppmH2S Configure Readout Span 100 0 Alarm Settings Zero 0 0 Sensor Information SN 513091900003 Technicians Only Born On 09 03 13 Sensor Temp 29006 Last Cal 1191 3713 NEXT key to exit Figure 11 4 Smart Sensor Information Menu The Sensor Information page covers settings associated with Smart sensors Users can review information contained in the Smart Sensor database Values cannot be user modified TYPE indicates what kind of input or sensor the GASMAX TX is configured to accept and is typically pre configured at the factory When installed Smart Sensors upload sensor type and other data to the GASMAX TX and this data may be viewed on the SMART SENSOR information screen SPAN displays the programmed value for 100 of
38. n amp Maintenance Manual Revision 1 0 The GDS Corp GASMAX TX Wireless Gas Monitor and matching C2 TX Wireless Site Manager work together seamlessly to deliver highly reliable cost effective customer friendly solutions for wireless gas detection The GASMAX TX can also be used in legacy mode with existing GDS Corp Wireless Controller Receivers such as the C1 Protector C64 Protector or C2 Quad Protector Controller Receiver The GASMAX TX supports one or two local or remote sensors for toxic gases carbon dioxide or hydrocarbon combustibles The advanced microcontroller non intrusive magnetic interface and superior graphic LCD display offers rapid setup simplified operation and enhanced diagnostics not found in previous generation products The GASMAX TX s tightly integrated radio modem utilizes frequency hopping spread spectrum FHSS technology to provide reliable transmission of gas concentration data and detector status across long distances while using very little power Battery life can be as long as one year under common circumstances Instead of complicated setup procedures that involve channel selection and identification codes the GASMAX TX is configured using a single network identifier letter and single device number When configured as part of a system with a third generation C2 TX Wireless Site Manager all configuration and setup information programmed into the GASMAX TX is automatic
39. nsider the following options 9 Set the Wakeup Timer to its maximum value of 5 minutes 300 seconds Shortening the Wakeup Timer will increase the number of transmissions and reduce battery life However this will also reduce the amount of time that a gas detector can be inactive before the Wireless Site Manager or receiver controller will signal a COMM ERROR 9 Reduce the power output for 900MHz radios Transmit power at 900 MHz can be adjusted from 1 watt max down to 10 milliwatts min Since most of the power consumed by the GASMAX TX is used by the radio to transmit reducing the power output will increase battery life However this will reduce the strength of the transmitted signal and may increase communications errors e Setting the TX Multiples value The TX Multiples menu setting enables every broadcast to be repeated up to five times with a 200 mSec delay between each transmission Increasing the TX Multiples value will increase battery usage but may reduce communications errors in noisy environments e Setting the TX Config value The TX Config setting determines how often the GASMAX TX transmits the large data packet that contains configuration data The default is 60 minutes Decreasing the TX Config interval will slightly increase battery power usage e Setting RF Handshaking If RF Handshaking is ON the Wireless Site Manager will actively acknowledge each transmission from the GASMAX TX If an acknowledge signal i
40. nsmit until a beacon signal is present Indicates a Range Warning This icon is presented if the server was previously out of range for any reason and can be reset using the Device Setup Reset Range Icon menu Low battery indication Displayed during each sniff cycle if the battery is near the end of its useful life LoBat Page 31 GASMAX TX Operation amp Maintenance Manual Revision 1 0 TREND AND DUAL DATA DISPLAY SCREENS Pressing the NEXT key allows the user to cycle through the available data and trend screens In single channel mode there are only two screens Data Display and Trend Display If both channels are active there are two Data Display screens two Trend Display screens and one Dual Data Display screen that shows both channels values and alarm status 30 Min Trend Channel Alarm Status KJE eg Figure 10 2 Dual Data and Trend Display Screens NORMAL OPERATION Every six seconds the GASMAX TX reads the sensor s digital output converts the reading to calibrated engineering units and displays the value on the LCD display Based on the gas concentration level and alarm levels programmed by the user the microprocessor determines if a compact wireless data packet should be broadcast to the site manager or wireless controller receiver This data packet includes the gas value alarm and fault status bits and battery voltage The GASMAX TX will initiate a dat
41. nsvnnsvnnsvnrnvnenenenrnenrnenrnenenenenenenenenenrarsversvessrnsnrnsnrnsnenen 11 FIGURE 5 1 GDS CORP WIRELESS SYSTEM ARCHITECTURE na 14 FIGURE 5 2 RF TRANSMISSION MARGIN ENNEN ENNEN 15 FIGURE 5 3 RFTRANSMISSION ZONE snarer inkaene rer bk 16 FIGURE 5 4 VERTICALLY POLARIZED OMNI DIRECTIONAL AND YAGI ANTENNAS AEN 17 FIGURE 6 1 GASMAX TX WITH SINGLE LOCAL SENSOR A 19 FIGURE 6 2 GASMAX TX WITH DUAL SENSORS AA 20 FIGURE 6 3 P N 10 0411 REMOTE SENSOR SEPARATION KIT 20 FIGURE 7 1 GASMAX TX I O BATTERY BOARD 22 FIGURE 7 3 CONNECTING GASMAX TX REMOTE SENSOR AAA 23 FIGURE 8 1 GASMAX TX DISPLAY A 25 FIGURE 8 2 STEP BY STEP SETUP CHECKLIST Lusis eee dinar 26 FIGURE 9 1 CALIBRATION SETUP usikre 29 FIGURE 9 2 CALIBRATION FLOWCHART stassini nn stenen gedd ie a 30 FIGURE 10 1 GASMAX TX DATA DISPLAY SCREEN AAA 31 FIGURE 10 2 DUAL DATA AND TREND DISPLAY SCREENS nun 32 FIGURE 10 3 GASMAX TX SENSOR REPLACEMENT A 34 FIGURE 11 1 GASMAX TX MAIN MENU TREE ee eee 36 FIGURE 11 2 CHANNEL CONFIGURATION MENU AANEREN 37 FIGURE 31 3 ALARM SETTINGS MENU Vex Yoa static cavccbsdenstaccsvtesvunteccercedvesseunttateebucseveuadeaecduotees 38 FIGURE 11 4 SMART SENSOR INFORMATION MENU ANNE 39 FIGURE 11 53 TECHNICIANS MENU 555275 de 39 FIGURE 71 62 SET UNITY GAIN MEN Ur Ee 40 FIGURE 11 7 PREAMP GAIN
42. o 2 wavelengths away from walls or steelwork Since wavelength proportional to frequency 900 MHz signals have a wavelength to approximately 12 inches and 2 4 GHz signals have a wavelength of about 3 inches Therefore 900 MHZ antennas should be installed with at least 2 feet of clearance and 2 4GHz antennas at least 6 inches of clearance from walls or structures Antennas may be mounted with less clearance but output will be reduced this may not matter if the distances involved are short It is important the antenna mounting bracket to well connected to earth or ground for good lightning surge protection Rubber duck or collinear antennas emit RF energy in vertical polarization where the electric fields oscillate in the vertical plane and the magnetic fields oscillate in the horizontal plane Transmitting and receiving antennas should always be oriented such that the polarization is the same Page 16 GASMAX TX Operation amp Maintenance Manual Revision 1 0 YAGI DIRECTIONAL ANTENNAS Yagi antennas are directional along the central beam of the antenna The folded element is towards the back and the antenna should be pointed in the direction of the transmission Yagi antennas should also be mounted with at least 1 to 2 wavelengths of clearance from other objects The polarity of the antenna is the same as the direction of the orthogonal elements For example if the elements are vertical the Yagi tr
43. o enable properly programmed GDS Corp controller receivers to indicate IN CAL for the current channel Once CAL SPAN is complete the GASMAX TX transmits a data packet containing a value of 800 counts 0 of scale However if an oxygen sensor is detected then the GASMAX TX will transmit a data packet with a value of 3475 counts 83 6 of scale to simulate the typical 20 9 value found in atmospheric oxygen levels CAL MODE automatically exits if no keystrokes are detected after 5 minutes Follow these GASMAX TX calibration guidelines e Calibration accuracy is only as good as the calibration gas accuracy GDS Corp calibration gases are traceable to NIST National Institute of Standards and Technology e Never use calibration gas that has passed its expiration date e Check the SPAN GAS VALUE setting and make sure it matches the calibration gas See Fig 6 2 e Always use a GDS Corp calibration cup that completely surrounds the sensor head e Be sure to use ZERO AIR a mixture of 21 oxygen and 79 nitrogen as a zero reference unless you are certain that no target gas exists in the area Ambient gas may result in an elevated zero condition that will cause a FAULT to occur once the ambient gas is no longer present e Always calibrate a new sensor before depending on the device for personnel or equipment safety e Calibrate on a regular schedule GDS Corp recommends a full calibration every 3 months with periodic bump tests on a mo
44. or 23 Sealing Antenna and cable Fittings 24 Use in Hazardous Areas 24 8 INITIAL SETUP 25 power on and User Interface 25 Setting Up the GASMAX TX and C2 TX Wireless Site Manager 26 Page 3 GASMAX TX Operation amp Maintenance Manual Revision 1 0 Initial Setup Legacy Mode 27 9 CALIBRATION 28 Calibration Overview 28 Calibration Procedure 29 10 OPERATION AND MAINTENANCE 31 Data Display Screen 31 Trend and Dual Data Display ScreenS 32 Normal Operation 32 Optimizing Battery Life 33 Alarm setup 33 Sensor Replacement 34 Sensor Replacement Remote Sensors 35 Normal Maintenance 35 11 USER MENUS 36 Channel Configuration Menu 37 Device Setup Menu 41 12 TROUBLESHOOTING GUIDE 45 Sensor Indicates Fault or Overrange 45 Sensor Will Not ZERO 45 GASMAX TX EXHIBITS UNUSUAL OR UNEXPECTED BEHAVIOR 45 GASMAX TX Display Blank 45 GASMAX TX and C2 TX Wireless Site Manager Displayed Values Don t Match 45 Wireless Site Manager DISPLAYs Comm Error For a Single GASMAX TX 46 Wireless Site Manager DISPLAYs Comm Error For aLL GASMAX TX 46 Page 4 GASMAX TX Operation amp Maintenance Manual Revision 1 0 13 SPARE PARTS Display amp Enclosure Sensor Head Accessories Sensor Separation Kit 14 DRAWINGS AND DIMENSIONS 15 NETWORK PARAMETERS Page 5 47 47 48 48 49 50 GASMAX TX Operation amp Maintenance Manual Revision 1 0 TABLE OF FIGURES FIGURE 4 1 GASMAX TX BLOCK DIAGRAM rurnnvvnnsvn
45. ove to the next character Press EDIT again when done EUNITS engineering units may have up to a 10 character ASCII field Many common gases have pre configured Eunits based upon the sensor type and each may be edited in this menu ZERO 0 defines the reading to be displayed when the input is at 0 SPAN 100 defines the reading to be displayed when the input is at 100 The highest reading allowed is 9999 including negative polarity sign Polarity is only indicated for negative readings DECIMAL POINTS set the resolution of the LCD readings and may be set for 0 1 or 2 For example ZERO readings for 0 1 amp 2 decimal points displays as 0 0 0 amp 0 00 CAL SPAN VALUE sets the engineering units value of the calibration gas GDS Corp recommends that the calibration gas value be between 25 and 75 of full scale Calibrating at 100 of scale is not recommended READOUT DEADBAND forces low values to continue to read zero This is useful when there are small amounts of background gases that may cause fluctuating readouts The highest amount of deadband allowed is 5 Page 37 GASMAX TX Operation amp Maintenance Manual Revision 1 0 TRACK NEGATIVE allows the display to show negative values when set to YES This can be helpful when troubleshooting sensor problems The default setting is NO and forces the display to read 0 if the sensor value drops below zero However negative sensor outputs
46. per channel Alarm status bits and battery voltage information is also transmitted RF Section User adjustable transmit power from 10 mW to 1 0 watt 30 dBm frequency range 900 MHz from 902 to 928 MHZ Beacon receiver sensitivity 100 dBm RF Section Fixed transmit power of 50 mW Frequency range from 2 406 GHz to 2 435 GHz network 2 4 GHz identifier A R and from 2 444 GHz to 2 472 GHz network identifier 5 2 Temperature 40 C to 55 C Memory On board non volatile memory retains all user settings Housing Aluminum housing with epoxy paint standard 316 stainless steel optional Dimensions Width 5 4 137 mm Height 8 203 mm Depth 5 127 mm Shipping wt 6 5 Ibs 3 kg Approvals Enclosure CSA certified for Class Division 1 hazardous areas Warranty Two years on electronics one year on sensor AVAILABLE SENSORS AND RANGES P N Sensor Range P N Sensor Range 10 9750 Methane 0 100 LEL 10 9753 Carbon Dioxide 0 100 10 9751 Propane 0 100 LEL 10 9710 Oxygen 0 25 10 9722 Ethylene Oxide 0 100 ppm 10 9711 Carbon Monoxide 0 300 ppm 10 9723 Arsine 0 1 ppm 10 9712 Chlorine 0 10 ppm 10 9724 Silane 0 50 ppm 10 9713 Chlorine Dioxide 0 1 ppm 10 9725 Fluorine 0 1 ppm 10 9714 Hydrogen 0 4 10 9726 Phosgene 0 1 ppm 10 9715 Hydrogen Sulfide 0 9999 ppm 10 9727 Hydrazine 0 1 ppm 10 9716 Hydrogen Cyanide 0 30 ppm 10 9728 Nitric Oxide 0 50 ppm 10 9717 Hydrogen Chloride 0 30 ppm 10 9729 Nitrogen
47. r frequency signals to travel around interfering objects Systems utilizing 2 4 GHz radios transmit at lower power levels and have corresponding less range In addition higher frequency 2 4 GHz signals tend to require a more direct line of sight between the gas detector and controller receiver antenna On the other hand 2 4 GHz systems are generally license free world wide and are generally less prone to interference from other radio frequency sources Page 12 GASMAX TX Operation amp Maintenance Manual Revision 1 0 NOTE CHOICE OF FREQUENCY IS MADE AT TIME OF ORDER SYSTEMS DESIGNED FOR 900 MHZ CANNOT BE FIELD UPGRADED TO 2 4 GHZ AND VICE VERSA Once the choice of frequency band is made every device in the network must have a matching Network Identifier CAT Z that determines the radio s frequency hopping pattern and system identifier In addition each GASMAX TX must also have a unique device ID 1 240 that allows the controller to identify the specific gas detector Finally there must be one device that transmits the synchronizing Beacon signal that all radios use to synchronize their transmissions While the GASMAX TX is optimized for use with third generation controllers such as the C2 TX Wireless Site Manager the GASMAX TX can also be integrated into existing wireless networks that utilize a C1 Protector 16 channel controller C64 Protector 64 channel controller or C2 Quad Protector 4 channel contro
48. range Factory programmed ZERO displays the programmed value for 0 of range Factory programmed SERIAL NUMBER displays the unique sensor serial number BORN ON displays the date when the sensor was originally configured at the factory LAST CAL displays the date of the most recent calibration CHANNEL X TECHNICIANS MENU Channel ENABLED Set Gain to Unity s Configure Readout Preamp Gain Set L Alarm Settings Zero Cal Value 0 0 Sensor Information Raw Min Counts 800 Technicians Only Raw Max Counts 4000 Sensor Temp 29 0 RF Link Test gt A D Counts 805 Figure 11 5 Technicians Menu ZERO CAL VALUE should always be set to 0 RAW MIN RAW MAX COUNTS determines the range of the 12 bit analog to digital converter Raw Min Counts represents 0 of scale and Raw Max Counts represents 100 of scale Under certain conditions these counts values can be adjusted to remove excessive offset or increase the apparent gain of the sensor Raising or lowering the value of the Raw Min Counts will adjust the sensor zero point and reducing the Raw Max Counts will amplify the sensors output by reducing the range between zero and span NOTE ADJUSTING THE RAW MIN OR RAW MAX COUNTS SHOULD ONLY BE DONE BY TECHNICIANS FAMILIAR WITH THE GASMAX TX GAS MONITOR Page 39 GASMAX TX Operation amp Maintenance Manual Revision 1 0 TECHNICIANS MENU REX WARNING Set Gain to Unity ka PreAmp Gain Set e Previous cal
49. rdance with information contained herein Installation in any hazardous area must comply with all applicable restrictions requirements and guidelines for said hazardous areas It is the end user customer s final decision to ensure that the GASMAX TX is suitable for the intended use e The GASMAX TX is designed and constructed to measure the level of certain gases in ambient air Accuracy in atmospheres containing steam or inert gases cannot be guaranteed e Always mount the sensor head vertically with the sensor head facing down 9 Do not paint transmitter or sensor assembly e Do not operate the GASMAX TX if its enclosure is damaged or cracked or has missing components Make sure the cover internal PCB s and field wiring are securely in place before applying power e Do not expose the GASMAX TX to electrical shock or continuous severe mechanical shock Protect the GASMAX TX and related sensor assemblies from dripping liquids and high power sprays e Calibrate with known target gas at start up and check on a regular schedule at least every 90 days More frequent inspections are encouraged to spot problems such as dirt oil paint grease or other foreign materials on the sensor head e Periodically test for correct operation of the system s alarm events by exposing the monitor to a targeted gas concentration above the High Alarm set point e Use only for applications described within this manual Page 8 GASMAX TX Operatio
50. re frequent basis to ensure that the sensor has not been affected by temperature extremes or the presence of incompatible gases Page 28 GASMAX TX Operation amp Maintenance Manual Revision 1 0 CALIBRATION PROCEDURE Before beginning calibration make sure you have the following items A cylinder of calibration gas fixed flow regulator and an appropriate calibration cup connected to the regulator via a length of flexible tubing If necessary a cylinder of zero air may be necessary if the absence of target gas cannot be confirmed GDS Corp recommends a flow rate of 0 5 liters minute for standard gases and a flow rate of 1 0 liters minute for highly reactive gases such as chlorine or chlorine dioxide Flexible Tubing Fixed Flow Regulator Cylinder of Calibration Gas Calibration Cup Figure 9 1 Calibration Setup To calibrate a GASMAX TX detector Page 29 To enter CAL MODE press the DOWN CAL key and within 5 seconds press the EDIT key The screen will display an APPLY ZERO message Using the setup shown in Fig 5 1 apply clean GASMAX TX Operation amp Maintenance Manual Revision 1 0 ZERO air unless it can be guaranteed that no target gas is present After the reading stabilizes press the EDIT key to complete the ZERO calibration If the ZERO CAL SUCCESSFUL message is displayed an APPLY SPAN message will appear Apply the correct SPAN gas After the read
51. s not received by the GASMAX TX the transmission will be repeated up to three times RF Handshaking ON will increase wireless reliability but may reduce battery life if transmissions must be repeated NOTE RF HANDSHAKING CAN ONLY BE USED IF THE GASMAX TX IS TRANSMITTING TO A SINGLE WIRELESS SITE MANAGER OR RECEIVER CONTROLLER ALARM SETUP When used with third generation products like the C2 TX Wireless Site Manager GDS 98 Wireless System Manager or GDS 95 Alarm Station the alarm settings programmed into the GASMAX TX will directly trigger the alarm condition Alarm indicators can be set to activate above or below a given engineering units set point Alarm processing will trigger an alarm condition when the input exceeds the programmed value and includes hysteresis to keep the alarm from rapidly switching ON and OFF if the input remains close to the programmed alarm value Page 33 GASMAX TX Operation amp Maintenance Manual Revision 1 0 If the GASMAX TX is used with second generation legacy products such as the C2 Quad Protector Receiver Controller C1 Protector Receiver Controller or C64 Protector Receiver Controller the remote controllers ignore the alarm status bits and use broadcast gas levels to trigger alarms In this case alarm level data must be manually programmed at the receiver controller SENSOR REPLACEMENT If a sensor shows FAULT does not respond to gas or can no longer be calibrated it should
52. s ppm H2S WARNING ter Previous calibration will be erased EDIT to Continue NEXT to Exit PGA SETUP Gain 67 4 Counts 805 Reading 0 2 Up Dn to change NEXT to Exit Alarm 3 Fault Transmit Packet Figure 11 1 GASMAX TX Main Menu Tree Page 36 GASMAX TX Operation amp Maintenance Manual Revision 1 0 CHANNEL CONFIGURATION MENU The Channel Configuration menu contains settings that are unique to each channel There are two channels and each menu contains identical entries NOTE WHEN EDITING CHANNEL INFORMATION MAKE SURE TO SELECT THE CORRECT CHANNEL MENU CHX CONFIG PG1 2 CHANNEL x Measurement Name s Channel ENABLED Eunits ppmH2S Configure Readout zero 0 Alarm Settings Span 100 Sensor Information Decimal Points Technicians only Sensor Temp 29 0 Cal Span Value Readout Deadband Track Negative Backup Config Restore Config Load Defaults Figure 11 2 Channel Configuration Menu CHANNEL ENABLED DISABLED Channels should only be enabled if a sensor is attached SENSOR TEMP Shows the current sensor temperature MEASUREMENT NAME may be edited to contain any 16 character field and is typically used to describe the monitored point by user tag number or other familiar terminology To modify the existing setting press the EDIT key when the cursor is pointing to the entry Use the UP or DN keys to change the character and the NEXT key to m
53. steel sensor head and 15 3m length data cable The junction box contains a PCB with connection point for the sensor head cable and wiring terminals for the four wire digital data cable connection to the GASMAX TX display enclosure Fittings are NPT The sensor head should ALWAYS be mounted vertically as shown and GDS Corp recommends side entry for all conduit runs NOTE THE SENSOR SEPARATION KIT DATA CABLE CAN BE CUT TO ANY LENGTH FROM THE 15 FT 3M CABLE PROVIDED THE DATA CABLE SHOULD NOT BE LENGTHENED GASMAX TX monitors with remote mount sensors are shipped as separate pieces and must be assembled by the customer The data cable connects to the I O battery board in the GASMAX TX using TB1 for channel 1 and TB2 for channel 2 Connect the VCC SCL serial clock SDA serial data and Common as shown Connect to TB1 for remote sensor on channel 1 TB2 for remote sensor on channel 2 Figure 7 2 Connecting a GASMAX TX Remote Sensor Page 23 GASMAX TX Operation amp Maintenance Manual Revision 1 0 SEALING ANTENNA AND CABLE FITTINGS If a coax cable connects to the antenna via connectors it is very important to weatherproof the connection using 1000 2314 or equivalent sealing tape Moisture ingress into a coax cable connection is the most common cause of problems with antenna installations A three layer sealing process is recommended an initial layer of electrical PVC tape
54. te sensors located up to 15 feet from the GASMAX TX display Figure 6 3 shows the Sensor Separation Kit required for each remote sensor 15 3m Sensor Data Cable Figure 6 3 P N 10 0411 Remote Sensor Separation Kit Page 20 GASMAX TX Operation amp Maintenance Manual Revision 1 0 LOCATING THE GASMAX TX Factors such as air movement gas density in relation to air emission sources and environmental variables affect correct sensor location Air movement by fans prevailing winds and convection should be carefully evaluated to determine if a leak is more likely to raise gas levels in certain areas within the facility Vapor density of a gas determines if it will rise or fall in air when there are no significant currents Lighter than air gases should have the monitors mounted 12 18 inches 30 45 cm above the potential gas leak and heavier than air gases should be this distance below Even though the GASMAX TX is designed for rugged service sensors should be protected from environmental damage from water snow shock vibration and dust and dirt MOUNTING THE GASMAX TX Distance from nearest E c x metallic surface The GASMAX TX standard enclosure is a cast aluminum explosion proof NEMA 7 enclosure and should always be mounted with the sensor head opening facing down If necessary a Splash Guard p n 10 0205 should be 900 MHz attached if there is any chance that water or liquid spray could enter t
55. trast of the LCD display Page 43 GASMAX TX Operation amp Maintenance Manual Revision 1 0 DEVICE SETUP RF Link Setup Clock Delays Security eee WARNING LCD Contrast TURNING OFF POWER Turn Power OFF EDIT to Accept Reset Range Icon NEXT to Abort Figure 11 13 Power Off Menu TURN POWER OFF To turn the GASMAX TX off select the Device Setup Turn Power Off menu or hold the magnet over the NEXT key until the display shows EDIT to Accept and then press the EDIT key Page 44 GASMAX TX Operation amp Maintenance Manual Revision 1 0 SENSOR INDICATES FAULT OR OVERRANGE Certain toxic sensors indicate fault or over range at power up and quickly drift towards zero This is normal behavior Examine the sensor for moisture or discoloration Replace sensor if wet or discolored Inspect sensor cable and junction box for moisture or standing water Replace cable or junction box interface boards if wet or damaged If no moisture discoloration or damage is found sensor may be at the end of its useful life Replace sensor Toxic sensors left unpowered for more than 3 months are subject to accelerated degradation and may demonstrate a permanent loss of sensitivity SENSOR WILL NOT ZERO Background gas is present Use zero air a mixture of oxygen and nitrogen to zero the sensor Sensor output drifted above calibration maximum limit or drifted below fault limit Sensor is defectiv
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