GasCheck G3 Leak Detector Manual
Contents
1. GASCHECK G SERIES CONTACT US ACS PHONE FAX Toll Free 800 465 1004 Phone 801 486 1004 Fax 801 486 1007 ADDRESS LACO Technologies Inc 3085 West Directors Row Salt Lake City UT 84104 WEB www lacotech com info lacotech com SMT 07 1015 rev A2 ii O 2010 LACO TECHNOLOGIES INC CONTENTS 2 69 m M un s 1 PE icq dM 1 Bi OVE 2 12 Ds NIAINTENANCE 16 2010 LACO TECHNOLOGIES INC 1 SCOPE 2 SAFETY LACO USER MANUAL GASCHECK G SERIES This manual contains safety operation and maintenance information for GasCheck G Series handheld sniffer leak detector Our leak detectors are designed to ensure safety when used properly It is the responsibility of the user to follow safety related warnings cautions notes and other requirements described in this manual Should a question comment or problem arise the information below is provided as a guide When returning a unit for factory service or calibration contact LACO for a return material authorization number RMA The device should be boxed securely and contain all contact information including return shipping information If the device is being sent to the factory for service a written statement of the problem or symptoms should then be included The RMA number must be on the outside of the package or ind2. Thermal conductivity DETECTION TIME TO T90 1 sec short probe 9 sec long probe CLEAR DOWN TIME 1 sec short probe 9 sec long probe BATTERY TYPE Alkaline or NiMH AA qty 4 BATTERY LIFE AT 20 C 68 F 40 hours 20 hours when using the backlight 2 O 2010 LACO TECHNOLOGIES INC LACO USER MANUAL GASCHECK G SERIES Table 2 GasCheck Replacement Parts PART NUMBER DESCRIPTION A 08045 Long probe A 08043 Short probe Replacement battery holder CM515 0 4101FAG 1 Leak Standard with Refillable Helium Reservoir 5x10 4 cc sec 515 0 4105 0 1 Open Style Leak Standard for use with helium regulator and tank 5x10 4 cc sec 3 1 APPLICATIONS Common applications include e Quality assurance Testing seal integrity after product manufacture Laboratory applications Detection of leaks from mass spectrometers and chromatograph equipment Industrial Leaks from gas cylinders pipe work and process equipment e Medical Testing of membrane materials and sealing of glove boxes e Pneumatic Valve seal testing 3 2 UNITS OF MEASUREMENT The GasCheck is calibrated against a 5 E 4 cc s helium leak to allow volumetric readings and also a 5000ppm helium to allow measurement of concentrations Table 3 Selectable Units of Measurement UNIT DESCRIPTION CC sec Cubic Centimeters per Second offers a reading that indicates the volume of gas escaping into atmosphere from a single point i e leakage from a hold in a ga
3. When the battery symbol is filled in the battery is full When the battery symbol is outlined the battery is exhausted BACKLIGHT The backlight symbol shows the status of the backlight even INDICATOR in bright daylight GAS The GasCheck G2 and G2 measure the leak rate of gas MEASUREMENT leakage in whichever units are selected SOUND The symbol shows if the sounder is on or off If the semicircle INDICATOR on the right of the symbol is present then the sound is switched on If not the sounder is switched off The beep that occurs with each key press can not be switched off BAR GRAPH The bar graph increases as gas is detected This graph is not scaled and should be used for indication only The GasCheck G1 has no measured units so it relies on this bar graph to indicate leakage When gas is detected and the bar graph has reached its maximum level a different sensitivity level can be selected to give a wider detection range PEAK HOLD When selected peak hold displays the maximum INDICATOR measurement on the display Pressing the ENTER key resets the reading but also logs the peak reading in memory 8 O 2010 LACO TECHNOLOGIES INC LACO USER MANUAL GASCHECK G SERIES 3 8 FUNCTIONS The GasCheck instruments have a variation of functionality Each of the functions listed below has a number to the right of the heading This number indicates which function is included with each model Table 6 GasCheck Function Comparison
4. any used batteries shall be in accordance with local and national safety and environmental requirements 2 4 CALIBRATION Calibration service is recommended on a yearly basis LACO Technologies has an A2LA Accredited calibration lab which complies to ISO IEC 17025 2005 and ANSI NCSL Z540 1 1994 Also complies with ISO 9001 quality standard Call LACO for more information on calibration services The GasCheck is a portable handheld gas detector instrument predominantly used for detecting gas leaks and can detect almost all gases to varying degrees It is powered by standard AA size batteries and will accept both Alkaline and Nickel Metal Hydride rechargeable types The GasCheck uses thermal conductivity as its means of detecting gas which offers a robust sensor technology that requires practically no maintenance beyond annual servicing All GasCheck G Series models have an easy to use graphical interface with an intuitive keypad allowing simple function selection and adjustment It can be upgraded to add features without the need to be returned to the supplier and without having to modify the internal firmware It has an LCD display LED indicator and audible sounder than indicates the detected signal Table 1 GasCheck Specifications COMPONENT DESCRIPTION TEMPERATURE 0 to 50 C 32 to 122 F STORAGE TEMPERATURE 25 to 70 C 13 to 158 F L 390 x W 60 x H 50mm L 15 35 x W2 35 x 2 0 WEIGHT 0 5 kg 1 0 Ib DETECTION TYPE
5. 0 124 im cc sec J ppm mgm J wr DISPLAY 5s IDE 2 ppm 0 05 UPGRADE LACO USER MANUAL GASCHECK G SERIES DESCRIPTION The GasCheck instrument has the ability to data log 10 readings within its internal memory To tore a reading press the ENTER key while on the main RUNNING SCREEN When readings are stored in memory a symbol will appear on the main viewing screen When the memory is full the Data symbol will flash The stored data can be viewed by scrolling through the logged readings using the UP and DOWN keys To delete the stored data 1 Press and hold the ENTER key 2 The TRASH CAN symbol will flash El Dala 3 Continue to hold the ENTER key until the data is deleted 4 Press the ESC key to exit to the MAIN MENU GasCheck instruments have the capability of displaying detected readings ina variation of units ppm cc s mgm3 and g yr Use the UP and DOWN keys to select the desired unit and then press the ESC key to exit to the MAIN MENU NOTE the Custom Calibration routine automatically selects the type a calibration depending on his setting See 5 1 CALIBRATION e CC SEC cubic centimeters per second offers a volumetric leak rate that directly measures the volume of a gas escaping from a given point It is also known as ml sec milliliters per second The GasCheck can typically detect helium leaks down to 0 0005 of a cubic centimeter per second PPM Parts per million This unit indicates a con
6. 4 Insert the instrument s probe fully into the sample bag containing the gas and press the ENTER key The instrument will automatically sequence through the cold and hot stages of calibration but when finished gives a summary of values 5 Pressthe ENTER key to return back to the calibration option screen Press the ESC key to start using the instrument or press the ENTER key to calibrate again NOTE To avoid errors in calibration the following points should be noted e Avoid bending the inner probe as this will affect the GasCheck s accuracy The GasCheck can detect changes in humidity and carbon dioxide Avoid breathing on the probe Avoid pressurizing the sample bag This will cause significant errors in reading 5 1 3 CALIBRATION PROCEDURE USING CC SEC UNITS Please read this entire procedure before proceeding with this calibration routine 1 Check your LACO CalMaster Leak Standard to ensure the pressure reading matches the leak rate shown on the calibration stick The pressure gauge may be installed on your leak standard or for open style leak standards the pressure gauge is set on helium regulator 2 Select the CUSTOM CAL symbol from the instrument s menu 3 Ensure the instrument is in clean air and then press the ENTER key The instrument will Zero This will take a few seconds but once complete a READY message will appear 4 Insert the instruments probe into CalMaster Leak Standard s outlet and press
7. 60 R Refrigerant R11 R 3 2 E 5 0 000032 11 2010 LACO TECHNOLOGIES INC LACO USER MANUAL GASCHECK G SERIES NAME ABBREV MAX SENS CC SEC MIN SENS CC SEC Hexafluoride 10 Refrigerant R410a 3 2 E 5 0 000032 Refrigerant R507 3 8 E 5 0 000038 4 BASIC OPERATION All GasCheck G Series models have the same keypads The following section explains the general functionality of each key ESCAPE UP This key is used to return the display to the previous screen and to abort an adjustment Repeated pressing of this key will return the display to the Display screen Use the UP key to scroll through the function menu and to adjust settings ENTER 4 DOWN This key is used to select functions and Use to scroll down or change accept settings after a parameter has selection been adjusted 4 ZERO Pressing the Zero key Zeros out background readings 5 page 13 On Off Press this key once to switch the instrument ON To switch the instrument off press and hold this key until the bar graph reaches the right side of the screen This procedure has been designed to avoid accidental switch OFF 12 O 2010 LACO TECHNOLOGIES INC LACO USER MANUAL GASCHECK G SERIES 4 1 STARTUP ROUTINE Gas heck os 1 When the GasCheck first switches on it will display its model number and the gas that it has been calibrated with serial 07 00001 2 second screen then displays the instrum
8. ECK G SERIES DESCRIPTION The GasCheck is calibrated using helium gas at manufacture however other gases can be detected and measured using a gas table within the instrument Although GasCheck can t differentiate between gases it can quantify other gases using response factors stored in its internal gas table Gas groups 0 1 2 3 and 4 offer a generic sensitivity See Table 8 Gas Sensitivity to compare response factors for specific gases For advice on gases not listed please contact LACO Technologies To select an alternative gas 1 Use the UP and DOWN keys to select the desired gas 2 Press the ENTER key to confirm the selection 3 A tick will appear 4 Press the ENTER or esc to exit to the MAIN MENU If the gas to be detected does not appear in the instrument s internal gas table then one of the five Gas Groups can be selected Gas Groups have a variation of sensitivities Group 1 is high sensitivity and Group 5 is low sensitivity Gas groups allow the instrument to calculate leak rates with reasonable accuracy Table 7 GasCheck Feature Comparison FEATURE CONTRAST gt gt gt x gt gt Ea N W BACKLIGHT PEAK HOLD CUSTOM CALIBRATION BATTERY TYPE DATA LOG UNITS OF MEASUREMENT GAS TABLE UPGRADE Table 8 Gas Sensitivity NAME ABBREV SENS MIN SENS CC SEC Refrigerant R12 0 000027 Refrigerant R1301 0 000024 Refrigerant R134a 0 000028 Refrigerant R22 0 0002
9. ER MANUAL GASCHECK G SERIES Should a probe become blocked use dry clean compressed air to blow out the blockage from the instrument end of the probe WARNING Ensure safety guidelines are adhered to when using compressed air 44 DETECTING LEAKS Hold the GasCheck in one hand and draw the instrument probe along the area to be checked at approximately 25 mm per second When a leak is detected retrace the route of the probe at a slower rate until the leak is located Once located hold the instrument over the leak until the measurement stabilizes The reading can be logged by pressing the ENTER key Some readings may be larger than the instrument can detect and the measurement units will be replaced by 99999 on the display In this case use the UP or DOWN key to adjust the instrument sensitivity When detecting very small leaks probe movement at a rate of 10mm per second may be required The outer gray probe cover can be removed to allow better access to restricted areas If the outer probe is removed please note the following Avoid bending the inner probe A bent probe will affect accuracy To prevent probe blockage avoid placing the probe in liquid or dirt Care should be taken to ensure the brass sensor housing component remains at a constant temperature Avoid touching the brass sensor block with fingers The GasCheck can detect changes in humidity and carbon dioxide Therefore avoid breathing on the probe The
10. FUNCTION DESCRIPTION MODEL CONTRAST Use this function to adjust the contrast of the GasCheck LCD liquid crystal display G1 G2 G3 Significant variations in ambient temperature conditions can cause the display to x x 32 appear too dark or too light When this function is selected a number will appear to the right of the Contrast symbol as a percentage Use the UP and DOWN keys to adjust the display the contrast to the desired level When satisfied with the contrast level press the ESC key to exit to the MAIN MENU BACKLIGHT The user can select either BACKLIGHT ON or BACKLIGHT OFF In daylight the user may G1 G2 G3 not be able to determine if the backlight is ON or OFF A symbol on the main RUNNING fom VR SCREEN shows the status m When the backlight is ON it significantly reduces battery Backlight Off 40 hours of use Backlight On 20 hours of use The GasCheck has an audible sounder that increases frequency as detected gas levels G1 G2 G3 increase This sounder can be switched ON and OFF Use the UP or DOWN key to move the tick to the desired position and then press the ESC key to return to the MAIN aji Sound An audible can also be heard whenever the key pad is a Sound Off pressed This beep cannot be switched off When selected this function holds the highest detected amp Peak hold On G2 G3 reading on the display until the ENTER key is pressed Pea
11. as been calibrated by the user To do this move the tick under the CUSTOM CAL symbol and press the ENTER key The GasCheck requires either 5000 ppm helium concentration or a 0 0005cc sec 5 E 4 cc sec leak rate as a reference The GasCheck automatically selects the type of calibration media based on which unit the instrument has already selected If the GasCheck is used to detect leaks measured using ppm or mg m3 units then the instrument must be calibrated using a 5000 ppm helium concentration If the GasCheck G is used to detect leaks measured using cc sec unites the instrument must be calibrated using a 0 005 cc sec 5 E 4 helium leak 5 1 2 CALIBRATION PROCEDURE USING PPM UNITS Please read this entire procedure before proceeding with this calibration routine 1 Fill an empty uncontaminated sample bag with 5000 ppm helium gas before starting the calibration procedure Also remove the outer gray probe from the GasCheck 2 Select the CUSTOM CAL symbol from the instrument s menu option appears allowing the adjustment of the ppm value to ensure the instrument matches the gas concentration being used Use the up and down keys to adjust between 4900 and 5100 ppm 16 2010 LACO TECHNOLOGIES INC LACO USER MANUAL GASCHECK G SERIES 3 Ensure the instrument is in clean air and then press the ENTER key The instrument will Zero This will take a few seconds but once complete a READY message will appear
12. centration but can t be used to quantify a volume of gas leakage Milligrams per meter cubed Like ppm this unit is also a concentration so it can t be used to quantify a volume of gas leakage G YR Grams per year offers an alternative volumetric leak rate that directly measures the volume of a gas escaping from a given point The GasCheck has the capability of displaying a cc sec and g yr reading in either decimal or exponent form Readings in ppm and mg m3 can only be displayed in decimal form To change the display 1 Use the UP and DOWN keys to select the desired unit 2 Press the ENTER key to display the next screen 3 Use the UP and DOWN keys to select the desired display and then press the ESC key twice to exit to the MAIN MENU The GasCheck instrument can be upgraded using a simple upgrade code This facility allows the GasCheck to be upgraded instantly by the user in the field See Table 7 GasCheck Feature Comparison to compare the various features within each model To upgrade a GasCheck simply purchase an upgrade code from LACO Technologies enter the 12 digit number on the upgrade screen using the UP DOWN ENTER and ESC keys Once all 12 digits are entered correctly the instrument will automatically switch off When the instrument is switched on the new instrument model number will be displayed 10 O 2010 LACO TECHNOLOGIES INC FUNCTION GAS SELECTION LACO USER MANUAL GASCH
13. ent s serial number the I Il 3f u AF e A Firmware v2 25 instrument s firmware version and web address ze EJ Sa e ee 3 A third screen appears to indicate the GasCheck is Zeroing it s signal 4 Zero routine is complete the instrument displays its running Yt screen and is ready for use 42 USING THE GASCHECK G SERIES WARNING Before switching on the GasCheck ensure the ambient air is clean The instrument automatically Zeros the sensor at switch on After the instrument has run through the start up routine adjust the instrument settings to the desired levels Check the instruments sensitivity using a CalCheck or calibration kit 4100 NF 1 Switch the GasCheck on by pressing the ON OFF key After the instru 0000322 i ment has completed its Zero routine it will show its normal running screen Ensure the instrument is on the X100 times one hundred range While on the main running screen use the UP and DOWN key to adjust between sensitivity ranges X100 is the most sensitive X1 is the least sensitive 2 Gasleaks tend to occur at pneumatic joints or welded seams To test for a leak hold the GasCheck at a 45 degree angle to the object being tested and drag the probe along the seam or joint at a rate of approximately 25mm per second 3 Whenaleakis detected the bar graph will start to fill and the frequency of the audio output will i
14. icated on the shipping label Please read this manual in full before using the GasCheck G Series instrument LACO Technologies Inc takes no responsibility for damage injury or death resulting from misuse misunderstanding or negligence while using this gas detector Please contact LACO Technologies for clarification on any aspect of this manual that is not understood or for additional information 2 1 QUALITY ASSURANCE GasCheck G Series instruments are manufactured in compliance with 1509001 2000 which ensures that the equipment supplied to the customer has been designed and assembled from traceable components leaving LACO Technologies calibrated to traceable standards 2 2 RESPONSIBILITY OF USE Many gases are hazardous and can cause explosion poisoning and corrosion resulting in damage to property and life It is the responsibility of the person using this instrument to ensure it is being used in accordance with this manual and that the instrument is functioning correctly before use The GasCheck G Series handheld leak detectors can detect a large range of gases but some gases are more difficult to detect It is the responsibility of the user to ensure the GasCheck instrument has the sensitivity to detect the required gas before reaching potentially dangerous levels 1 O 2010 LACO TECHNOLOGIES INC 3 OVERVIEW LACO USER MANUAL GASCHECK G SERIES 2 3 DISPOSAL Disposal of the GasCheck G Series its components and
15. k hold Off Select Peak ON or OFF using the UP or DOWN key and then press the ESC key to exit to the MAIN MENU When using the GasCheck G press the ENTER key to clear the held reading The reading held on screen will be logged when the ENTER key is pressed WARNING ZEROing the instrument in a contaminated environment will result in false readings CALIBRATION There are two Calibration settings that can be selected FACTORY and CUSTOM Factory calibration is carried out shortly NS Factory Cal vm al after manufacture and cannot be adjusted However custom O x x calibration offers the ability to calibrate the instrument between Custom Cal 3 g annual Factory calibrations The GasCheck G ZEROs its reading du at switch ON Therefore the Custom calibration routine has only one stage For more information see 5 1 CALIBRATION BATTERY The GasCheck will operate using AA size batteries in either Battery exhausted SELECTION Alkaline non rechargeable or Nickel Metal Hydride Y rechargeable Battery half full EF Battery full Alkaline Select the battery type using the UP or DOWN key and then NiMH ress the ESC key to exit to the MAIN MENU Failing to select the correct battery type will not damage the instrument or affect its ability to detect gas However it will cause the battery indicator to read incorrectly 9 O 2010 LACO TECHNOLOGIES INC FUNCTION VIEW DATA B ce 21000075 sec 0 0
16. lied As air passes through the cell a constant level of heat is transmitted to a Temperature Stable block through the air This rate of heat transmission is used to Zero the instrument Fan Air flow NN Probe Display When gases with different thermal qualities pass through the chamber the amount of heat being transmitted to the Temperature Stable block changes These changes are measured calculated and displayed on the GasCheck as leak rates or gas concentrations NOTE Some gases have similar thermal properties to that of the air therefore the GasCheck can only detect larger concentrations of these gases NOTE Some gases have positive and other gases have negative signals To simplify the instruments function the GasCheck only display changes as positive readings NOTE The GasCheck G2 cannot differentiate between gases Selecting a specific gas on the GasCheck G Series allows the instrument to calculate concentrations of that gas only if that gas is being detected 6 O 2010 LACO TECHNOLOGIES INC LACO USER MANUAL GASCHECK G SERIES 3 6 INSTRUMENT MAIN MENU Once the GasCheck has run through its START UP routine it will display its normal RUNNING SCREEN used when locating gas leaks Before using the instrument the various settings should be adjusted to suit the application Pressing the ESC key while viewing this RUNNING SCREEN will access the instrument s MAIN MENU Repeated pressing of the ESC ret
17. ll gases conduct heat by varying amounts If an object is heated and the source of the heat is then removed the object will eventually cool down to match the ambient air temperature This action occurs because the ambient air surrounding the object carries the access heat into the surrounding atmosphere This principal is also the same for objects that are cooler than the surrounding ambient air Dissipation of heat into an air atmosphere is known and is a predictable rate However if the ambient air is replaced with an alternative gas like helium the rate at which an object cools down changes If the object mentioned above had its environment replaced with pure helium it would cool down to the environment temperature about 6 times faster 5 O 2010 LACO TECHNOLOGIES INC LACO USER MANUAL GASCHECK G SERIES The GasCheck G Series contains a heated thermistor bead that transmits heat to a block of material that remains at a constant temperature As air passes through the detector chamber a constant amount of heat passes from the bead to the block Gases that are different to air will affect the rate at which heat transmits from the bead to the block These rates of change are measured and displayed as leak rates The diagram below shows the basic functionality of the GasCheck Thermal Conductivity sensor A fan draws a small flow of gas through the probe and into the sensing chamber The thermistor bead heats up when electrical power is app
18. ncrease but will reduce as the probe moves away from the leak Return the probe to the suspected leaking area and move slowly along the same area until the leak is located Once located the probe should be held at the leak until the numeric reading stabilizes 4 The bar graph offers a graphical indication only and should not be used to measure a leak You many find that the numeric reading will continue to increases after the graph has completely filled Should the instrument detect a leak that is too large for the range selected the numerical screen will flash and display 9999 Use the UP or DOWN keys to adjust the instrument sensitivity 13 O 2010 LACO TECHNOLOGIES INC LACO USER MANUAL GASCHECK G SERIES Variation in temperature humidity and background gas may result in a constant level being detected on the instrument To reset to Zero hold the instrument away from the source of contamination and then press the ZERO key The instrument s display will return to a near Zero reading The following things will affect the instrument s reading CO and moisture from the breath of the instrument user e Barometric air pressure and background temperature Sources of cold and heat 4 3 PROBE OPTIONS In some applications the gray probe cover may restrict access to the area under test The gray probe cover can be removed by pulling it off the instrument When the gray cover is removed great care should be taken when using the in
19. s filled vessel or pipe ppm Parts Per Million is a concentration reading The GasCheck G will display the concentration being detected However it is more difficult to gauge the quantity of leakage mg m3 Milligrams per meter cubed is also a unit that measures concentration See ppm above 9 yr Grams per Year is an alternative measure leak rate 3 O 2010 LACO TECHNOLOGIES INC LACO USER MANUAL GASCHECK G SERIES 33 IMPORTANT NOTES The GasCheck G Series range is NOT intrinsically safe so it should not be used in potentially explosive environment Intrinsically safe GasCheck instruments are available please contact LACO Technologies for more information e Ambient air pressure heat and humidity can also affect readings e The GasCheck G range is NOT gas specific i e it cannot differentiate between gases 34 PACKING LIST Please remove all packing material and then check the content of the carry case against the list below before use Should the instrument or any accessory appear damaged or missing contact the instrument supplier for advise before use Table 4 Packing List ITEM QTY DESCRIPTION CHECK GasCheck G instrument w short probe and nozzle fitted Box wrench to change probe WI INL RN Calibration certificate s CD containing additional product information Was Spare battery clip NEN 4 2010 LACO TECHNOLOGIES INC LACO USER MANUAL GASCHECK G SERIES 35 THERMAL CONDUCTIVITY A
20. strument Note the following precautions Do not remove the semi transparent probe sleeve This sleeve ensures that the metal inner probe remains 1 mm from the surface of the test area avoiding accidental dirt and moisture ingress Do not touch the probe especially the brass sensor housing Heat from fingers can result in significant changes in signal causing false readings e Avoid placing the probe on wet or dirty surfaces Blockage of the probe will result in instrument failure Figure 2 Changing Probes joints and seams to be tested The GasCheck is also supplied with a 300mm Some applications may require a longer probe to gain access to pneumatic probe that can be changed by the user lt To change probes carefully do the following 1 Switch the instrument to OFF 2 Remove the outer gray probe cover see 1 3 Place the box wrench supplied with the instrument over the existing ea probe so the spanner fits over the brass nut see 2 and unscrew the gt probe a counterclockwise direction see 3 4 Withdraw the wrench and probe assembly see 4 To refit the short or the long probe follow the steps above but in reverse order CAUTION When using the box wrench to tighten the probe nut lt ensure the nut is firmly tightened Do not use additional 41 tools they may damage the tread 14 O 2010 LACO TECHNOLOGIES INC Figure 3 Detecting Leaks Leaking vessel LACO US
21. the batteries can be removed or replaced Care must be taken when refitting the batteries to ensure that they are the correct polarity Polarity markings are molded onto the battery holder plastic The battery holder can be reconnected to the GasCheck by firmly pressing the two halves of the PP3 clip together Care should be taken to ensure the polarity is correct See the PP3 diagram Figure 4 The battery pack is then laid within the instrument and the battery cover refitted Take care not to trap wires when refitting the battery cover Battery holder 18 O 2010 LACO TECHNOLOGIES INC
22. the enter key The instrument will automatically sequence through the cold and hot stages of calibration When finished it gives a summary of values 5 Pressing the ENTER key will return back to the calibration option screen Press the ESC key to start using the instrument or press the ENTER key to recalibrate again NOTE The GasCheck can detect changes humidity and carbon dioxide Avoid breathing on the probe 17 O 2010 LACO TECHNOLOGIES INC LACO USER MANUAL GASCHECK G SERIES WARNING Great care should be taken to ensure the calibration gas is neither pressurized or restricts flow to the instrument s probe Changes in flow of gas to the sensor will result in significant errors in readings 5 2 REPLACING BATTERIES Figure 4 Replacing Batteries Before using the GasCheck G instrument ensure the batteries are fitted correctly or ensure NiMH rechargeable batteries are fully charged before use To fit or replace batteries you must first remove the battery cover from the rear of the instrument This can be done by prying open the battery clip with a fingernail or screwdriver Removing the battery cover will reveal a battery hold which requires 4 x AA size batteries Before removing old batteries or fitting new ones unclip the battery holder from the instrument by prying apart the PP3 type clip as shown in the illustration Battery holder PP3 clip Once the battery holder is disconnected from the instrument
23. thin white tube that covers the inner probe should not be removed This tube ensures a 1mm gap is maintained between the probe and the surface being tested 15 O 2010 LACO TECHNOLOGIES INC 5 MAINTENANCE z o E o O u o AM SPAN set in Custom Cal ZERO taken at Switch On Detectected Gas baal Factory Cal Custom Cal 1 5000 zeroing m cola 12345 Ema LL MR hot 12345 p l LACO USER MANUAL GASCHECK G SERIES 5 1 CALIBRATION The GasCheck G Series has two selectable calibration settings factory and custom Factory calibration is carried out at lon Science during the instrument s manufacture It can be selected and used but cannot be changed The GasCheck is calibrated against a 5000 ppm helium concentration and a 0 0005cc sec 5 E 4 helium leak rate Custom calibration gives the user the ability to calibrate the instrument This setting may offer improved accuracy over the factory calibration if the barometric air pressure differs from that stated on the instrument s calibration certificate 5 1 1 SELECTING FACTORY OR CUSTOM CALIBRATION To select either FACTORY CAL or CUSTOM CAL select the calibration screen and move the up use the up and down keys to move the tick under the desired symbol then press the ESC key to exit to the main menu Custom calibration can only be selected and used after the instrument h
24. urns the user back to the RUNNING SCREEN Figure 1 Running Screen 100 of NER DODOS X E Running screen NOTE The amount of functionality varies between models See Table 1 GasCheck Specificationsto find which functions relate to which model a Vx f Contrast Page 10 Upgrade Page 12 123 h Backlight Page 10 N x Ti Sound Page 10 Gas Page 12 Main Menu ppm x Peak Page 10 View Data Page 11 Units Page 11 E Calibration Page 11 Battery Page 11 7 O 2010 LACO TECHNOLOGIES INC LACO USER MANUAL GASCHECK G SERIES 3 7 RUNNING SCREEN The GasCheck displays the RUNNING SCREEN whenever the instrument is being used to detect leaking gas The illustration below outlines the various information and icons Sensitivity levels Battery status Backlight indicator 3 EH Peak hold indicator Table 5 Running Screen Display FUNCTION DESCRIPTION GAS SELECTION The GasCheck G2 and G3 display the gas being measured in the top left of the RUNNING SCREEN The GasCheck G2 will display the gas selected at the factory only The G3 model has a range of gases that can be selected via an internal gas table SENSITIVITY The GasCheck G has three sensitivity levels e X100 times one hundred the most sensitive e X10 times ten mid range e X1 times one least sensitive BATTERY STATUS
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