GasCheck G 1, 2 and 3 (Graphical) User Manual V1.8
Contents
1. Corsec again Emaili oe 12345 ere NOTE E GasCheck G can detect changes in Humidity and Carbon dioxide therefore avoid breathing on the probe PartNo Description __ id Used i o O A 21500 0 0005 cc sec Helium Calibration kit For when GasCheck G is used with cc s units WARNING Great care should be taken to ensure the calibration gas is neither pressurised or restricts flow to the instruments probe Changes in flow of gas to the sensor will result in significant errors in readings Page 18 of 20 GasCheck G 1 2 and 3 Graphical Replacing Batteries GasTech Australia 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 prising open the battery clip with a finger nail or screw driver Removing the battery cover will reveal a battery holder which requires 4 x AA size batteries Before removing old batteries or fitting new ones unclip the battery holder from the instrument by prising apart the PP3 type clip shown in the illustration Once the battery holder is disconnected from the instrument the batteries can be removed or replaced however care must be taken when refitting the batteries to ensure they are the correct polarity polarity markings are moulded on to the battery holde2. when locating gas leaks Before using the instrument the various settings should be set and adjusted to suit the application Pressing the Esc key while viewing this Running screen will access the instruments Main Menu Repeated pressing of the Esc retums back to the Running screen PLEASE NOTE The amount of functionality varies between models The Function section Pages 10 to 12 of this manual indicates which functions relate to which model Vx Upgrade Page 12 Gas Page 12 Units Page 11 View Data Page 11 R He 100 oj B 0 00032 cefsec k 3 E Running screen Contrast Page 10 Backlight Page 10 m le Sound Page 10 Main Menu Peak Hold Page 10 F Calibration Page 10 Battery Page 11 Page 8 of 20 GasCheck G 1 2 and 3 Graphical GasTech Australia Running screen GasCheck G displays the Running screen when ever the instrument is being used to detect leaking gas the illustration below outlines the various information and icons Sensitivity levels Battery status Backlight indicator i ve COISEC z a 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 however the G3 model has a range of gases that can be selected via an internal gas table Sensitiv ity GasCheck G has three 3
3. QASTECH AUSTRALIA GasCheck G 1 2 and 3 Graphical User Manual V1 8 GasTech Australia Pty Ltd 24 Baretta Rd Wangara Western Australia 6065 Tel 1800 999 902 Fax 1800 999 903 http www gastech com au GasCheck G 1 2 and 3 Graphical GasTech Australia Page 1 of 20 GasCheck G 1 2 and 3 Graphical GasTech Australia Declaration of Conformity Manufacturer Ion Science Ltd The Way Fowlmere Cambridge England SG8 7UJ Product GasCheck G 1 2 and 3 Graphical Product description a handheld micro thermal conductivity sensor used to detect gas leaks This instrument has been designed specifically for search and location of non flammable gases such as helium and CFC s Directives 2004 108 EC Electrical Equipment Electromagnetic Compatibility EMC Standards BS EN 61010 1 2001 Safety requirements for electrical equipment for measurement Control and laboratory use Part 1 General requirements BS EN ISO 9001 2000 Quality management systems Requirements BS EN 61326 1 2006 Electrical Equipment for measurement control and laboratory use EMC Requirements Class B and General Immunity I the undersigned hereby declare that the equipment specified above conforms to the stated Directives and Standards Signed By Name Mark Stockdale Position Technical Director Date 30 October 2008 Page 2 of 20 GasCheck G 1 2 and 3 Graphical GasTech Australia Menu Page Declaration of conformity 2
4. ar 1 1 Boxspannerusedtochangeprobes _ _ _ o o OS 1 Le 1 E 1 is Ls User manual 1 Calibration certificate 1 CD containing additional product information 1 Spare battery clip pa Usepmanulh SSS O Page 6 of 20 GasCheck G 1 2 and 3 Graphical GasTech Australia How GasCheck G works Thermal Conductivity All gases conduct heat but by varying amounts if an object is heated and then the source of heat is removed the object will eventually cool down to match 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 it s environment replaced with pure Helium it would cool down to the environment temperature about 6 times faster The GasCheck G 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 measu
5. displayed Page 12 of 20 GasCheck G 1 2 and 3 Graphical GasTech Australia Getting Started The Keypad All GasCheck G models have the same key pads the following section explains the general functionality of each key ESCAPE UP This key is used to return the display Use the UP key to scroll to the previous screen and to abort an through the function menu adjustment Repeated pressing of this and to adjust settings key will return the display to the Display screen ENTER DOWN This key is used to select functions and Use to scroll down or change accept settings after a parameter has selection been adjusted ZERO Pressing the Zero key Zeros out background readings See 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 oe mea When the GasCheck G first switches on it will display its model Gas heck t number and the Gas that it has been calibrated with A second screen then displays the instrument s serial number the Sal l D ae instrument s firmware version and Ion Science web address IITA Wee Wy ONSClence COM A third screen appears to indicate the GasCheck G is Zeroing it s Pro ll i signal z Once the Zero routine is complete the instrument displays it s running screen an
6. for advice on gases not listed please contact Ion Science Ltd for advice rame de cc sec ml sec cc sec mli sec Oxwgm O2 29E 4cc sec_ 0 000290 cc sec_ To select an alternative gas use the Up and Down keys to select the desired gas and then press the ENTER key to confirm the selection at which point a tick will appear Press the ENTER or Esc key to exit into the Main menu If the gas to be detected does not appear in the instruments internal gas table then one of the five Gas Groups can be selected Gas Groups have a variation of sensitivities Group 1 being high sensitivity through to Group 5 being low sensitivity Contact Ion Science Ltd for advice Gas groups allow the instrument to calculate leak rates with reasonable accuracy i Upgrade 1 amp 2 The GasCheck G instrument can be upgraded using a simple upgrade code This facility allows GasCheck G to be upgraded instantly by the user in the field The table below shows the various features within each model hi Lil Li CU MYAYEDOTOTOTATAT ETAT GasCheckG model Custom Calibration Peak hold Measurement Gas table To upgrade a GasCheck G simply purchase an upgrade code from Ion Science Ltd enter the 12 digit number in 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
7. hand and draw the instrument probe along the area to be checked at approximately 25mm per second When a leak is detected retrace the route of the probe ata Slower rate until the leak is located Once located hold the instrument over the leak until the measurement stabilises 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 which case used the UP or DOWN keys to adjust the instruments sensitivity When detecting very small leaks or when detecting gasses less sensitive then a rate of 10mm per second may be required Leaking vessel The outer grey probe cover can be removed to allow better access to restricted areas if the outer probe is removed the following points should be noted Avoid bending the inner probe as this will affect the GasCheck G s accuracy Avoid placing the probe in liquid or dirt as the probe can become blocked Care should also be taken to ensure the brass sensor housing component remains at a constant temperature Avoid touching the brass sensor block with fingers GasCheck G can detect changes in Humidity and Carbon dioxide therefore avoid breathing on the probe The 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 Page 16 of 20 GasCheck G 1 2 and 3 Graphi
8. the type of Calibration media based on which units the instrument already has selected If the GasCheck G is used to detect leaks measured using ppm or mg m 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 units then the instrument must be calibrated using a 0 0005 cc sec 5 E 4 Helium leak Calibration procedure using ppm units Please read this entire procedure before proceeding with this calibration routine Fill an empty uncontaminated sample bag with 5000 ppm Helium gas before i aati starting the calibration procedure Also remove the outer grey probe from the GasCheck G Zeroing Select the Custom Cal symbol from the instruments menu An option appears F 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 RREA Ensure the instrument is in clean air and then press the ENTER key the pim instrument will Zero this will take a few seconds but once complete a Ready cold message will appear 12345 Insert the instruments probe fully into the sample bag containing the gas and i ie press the ENTER key The instrument will automatically sequence through the cold 2545 and hot stages of calibration but when finished gives a summary of values ppm Press the ENTER Key to retum back to the calibr
9. Menu 3 Statements 4 Instrument description 5 Packing list 6 How GasCheck G works 7 Instrument Main Menu 8 Running screen 9 Functions 10 Getting started 13 Using GasCheck G 14 Probe options 15 Detecting leaks 16 Calibration 17 Replacing batteries 19 Instrument specification 20 Replacement parts 20 Page 3 of 20 GasCheck G 1 2 and 3 Graphical GasTech Australia Statements Safety Please read this manual in full before using the GasCheck G instrument Ion Science Ltd takes no responsibility for damage injury or death resulting from misuse misunderstanding or negligence while using this gas detector Please contact Ion Science Limited via the address below for clarification on any aspect of this manual that is not understood or for additional information required This instrument should only be used by qualified or competent persons with suitable knowledge of the hazards relating to the gases contained within equipment or in the local environment Quality Assurance GasCheck G instruments are manufactured in compliance with ISO9001 2000 which ensures that the equipment supplied to the customer has been designed and assembled reproducibly from traceable components leaving Ion Science calibrated to traceable standards Responsibility of use Many gases are hazardous and can cause explosion poisoning and corrosion resulting i
10. ach of the functions listed below has number to the right of the heading that indicates which function is included within each model GasCheck G1 1 GasCheck G2 2 GasCheck G3 3 Contrast 1 2 amp 3 Use this function to adjust the contrast of the GasCheck G LCD Liquid Crystal Display Significant variations in ambient temperature conditions can course the display to appear too dark or feint 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 contrast to the desired level When satisfied with the desired level selected 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 not be able to determine if the backlight is On or Off therefore a symbol on the main running screen shows the status When the backlight is ON it significantly reduces battery life Backlight OFF 40hrs of use Backlight ON 20hrs of use Sound 1 2 amp 3 The GasCheck G has an audible sounder that increases frequency as detected gas levels increase This sounder ofi Sound On can be switched On and Off Use the Up or Down key o Sound Off to move the tick to the desired position and then press the Esc key to return to the Main Menu An audible beep can also be heard whe eve the key pad is pressed this beep can not be switched off Peak hold 2 amp 3 When se
11. ak to allow volumetric readings and also a 5000ppm Helium to allow measurement of concentrations Selectable units cc sec Cubic Centimetres per Second offers a reading that indicates the volume of gas escaping into atmosphere from a single point ie leakage from a hole in a gas filled vessel or pipe ppm Parts Per Million is a concentration reading GasCheck G will display the concentration being detected however it is more difficult to gauge the quantity of leakage mg m Milligrams per meter cubed is also a unit that measures concentration See ppm above g yr Grams per Year is an alternative measure of leak rate IMPORTANT NOTES The GasCheck G range is NOT intrinsically safe so should not be using in a potentially explosive environment Intrinsically safe GasCheck instruments are available please contact Ion Science Ltd for more information Ambient air pressure heat and humidity can also affect readings The GasCheck G range is NOT Gas Specific i e It can NOT differentiate between gases Page 5 of 20 GasCheck G 1 2 and 3 Graphical GasTech Australia 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 then contact the instrument supplier for advise before use Item Qty Description O OOS O O 1 1 GasCheck G instrument with short probe and nozzle fitted Long probe 1
12. ally the brass sensor housing Heat from fingers can result in significant changes in signal causing A 3 false readings Cs Avoid placing the probe on wet or dirty surfaces blockage of the probe will result in instrument failure Some application may require a longer probe to gain access to pneumatic joints and seams to be tested the GasCheck G is also supplied with a 300mm probe that can be changed by the user To change probes carefully SF follow the following steps Switch the instrument OFF O Remove the outer grey probe cover Oo Place the box spanner supplied with the instrument over the existing probe so the spanner fits over the brass nut unscrew the probe counter clockwise direction Withdraw the spanner and probe assembly 4 To refit the short or the long probe follow the steps above but in reverse order CAUTION When using the box spanner to tighten the probe nut ensure the nut is firmly tightened however do not use additional tools as the tread may become damaged 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 Ion Science Ltd takes no responsibility for injury or damage caused by misuse of compressed air equipment Page 15 of 20 GasCheck G 1 2 and 3 Graphical GasTech Australia Detecting leaks Over view Hold the GasCheck G in one
13. ation option screen Press the i cold 12345 ESC key to start using the instrument or press the ENTER key to calibrate again wal NOTE To avoid errors in calibration the following points should be noted Avoid bending the inner probe as thiswill affect the GasCheck G s accuray q GasCheck G can detect changes in Humidity and Carbon dioxide therefore avoid breathing on the probe Avoid pressurizing the sample bag as this will cause significant errors in reading Page 17 of 20 GasCheck G 1 2 and 3 Graphical GasTech Australia Calibration procedure using cc sec units Please read this entire procedure before proceeding with this calibration routine Zeroing Follow the instructions of the CalCheck unit the pointer of the pressure gauge A must resting over the green segment select the Custom Cal symbol from the instruments menu Ready 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 aurea message will appear i cole Insert the instruments probe into the CalChecks outlet and press the ENTER key T2345 The instrument will automatically sequence through the cold and hot stages of telser calibration but when finished gves a summary of values hoi Pressing the ENTER Key will return back to the calibration option screen Press 1345 the ESC key to start using the instrument or press the ENTER key to recalibrate
14. cal GasTech Australia Calibration Over view The GasCheck G has two selectable calibration settings Factory and Custom Factory Calibration is carried out at Ion Science Ltd Authorised Service Centres during the instruments manufacture it can be selected and used but can not be changed The GasCheck G 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 ZERO taken at Switch On the instrument this facility may offer improved accuracy over the Factory Calibration if the Barometric air Detectected Gas pressure differs from that stated on the instruments Calibration certificate F SPAN set in Custom Cal Cc o ra A Some oam Cc oD 7 Cc o 2 wi m D Selecting Factory or Custom Calibration To select either Factory or Custom Calibration select the il TARO baad z Calibration screen and user the UP and DOWN keys to move 4 Custom Cal y the tick check under the desired symbol then Press the Esc key to exit into the main menu Custom Calibration can only be selected and used after the instrument has been calibrated by the user to do this move the tick check under the Custom Cal symbol and press the ENTER key The GasCheck G requires either 5000 ppm Helium concentration or a 0 0005cc sec 5 E 4 cc sec leak rate as a reference The GasCheck G automatically selects
15. d is ready for use Page 13 of 20 GasCheck G 1 2 and 3 Graphical GasTech Australia Using GasCheck G The GasCheck G instrument WARNING Before switching the GasCheck G on ensure the ambient air is clean as the instrument automatically Zero s the sensor at switch on After the instrument has run through it s start up routine adjust the instrument settings to the desired levels Check the instruments sensitivity using a CalCheck or calibration kit He 100 of B Switch the GasCheck G on by pressing the ON OFF key after the i instrument has completed its Zero routine it will enter it s normal U 00US2 cores fy running screen see right pasai 3 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 most sensitive X1 is the least sensitive Gas leaks tend to occur at pneumatic joints or welded seams hold the GasCheck G at a 45 angle to the object being tested and drag the probe along the seam or joint at a rate of approximately 25mm per second Whe a leak is detected the bar graph will start to fill and the frequency of the audio output will increase 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 The bar graph o
16. er second The GasCheck can typically detect Helium leaks down to 0 0005 of a cubic centimetre per second ppm Parts per million this unit indicates a concentration but can t be used to quantify a volume of gas leakage mg m Milligrams per meter cubed like ppm this unit is also concentration so 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 Display 3 GasCheck G instruments have the capability of displaying cc sec and g yr readings in either decimal or exponent form Readings in ppm and mg m can only be displayed in decimal form Use the Up and Down Keys to select the desired unit Press the Enter key to display the next screen Use the Up and Down Keys to select the desired display and then press the Esc key twice to exit to the main menu Page 11 of 20 GasCheck G 1 2 and 3 Graphical GasTech Australia Functions continued Gas selection 3 GasCheck G is calibrated using Helium gas at manufacture however other gases He s can be detected and measured using a gas table within the instrument Although GasCheck G 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 The following list indicates response factors for specific gases however
17. ffers a graphical indication only and should not be used to measure a leak you may find that the graph completely fills however the numeric reading will continue to increase Should the instrument detect a leak that is too large for the range selected the numeric screen will flash and display 99999 use the UP or DOWN keys to adjust the instrument sensitivity 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 instruments display will return to a near zero reading The following things will affect the instruments reading Breath of the instrument user contains both CO2 and moisture Barometric air pressure and background temperature Sources of cold and heat Page 14 of 20 GasCheck G 1 2 and 3 Graphical GasTech Australia Probe Options In some applications the grey probe cove may restrict access to the area under test the grey probe cover can be removed by pulling it off way from the instrument O When the grey cover is removed great care should be taken when using the instrument and the following 1 precautions noted Do not remove the semi transparent probe sleeve this sleeve ensure 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 and especi
18. lected this function holds the highest detected reading on the display until the ENTER key is pressed Select Peak On or Off using the Up or Down key and i Peak hold On then press Esc key to exit to the Main menu Peak hold Off 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 2 amp 3 There are two Calibration settings that can be selected Factory and Custom Factory calibration is iad Factory Cal ct F7 Custom Cal carried out shortly after manufacture and cannot be adjusted however Custom calibration offers the ability to calibrate the instrument between annual Factory calibrations The GasCheck G Zero s its reading at switch on therefore the Custom calibration routine only has one stage Also see the Calibration section of this manual on Page 16 Page 10 of 20 GasCheck G 1 2 and 3 Graphical GasTech Australia Functions continued Alkaline s Pit lH 1IO 00005 cc E 210 00075 see a0 00124 Mi ec sec q PPT ppm mgm a Battery selection 3 The GasCheck G will operate using AA size batteries in either Akaline non rechargeable L Battery exhausted or Nickel Metal Hydride Rechargeable W Battery half full Select the battery type using the Up or Down key and then press the E
19. n damage to propetty 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 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 G instrument has the sensitivity to detect the required gas before reaching potentially dangerous levels Disposal Disposal of GasCheck G its components and any used batteries shall be in accordance with local and national safety and environmental requirements This includes the European WEEE Waste Electrical and Electronic Equipment directive Ion Science Ltd offers a take back service Please contact Ion Science Ltd for more information Calibration Facility Ion Science Ltd offers a calibration service including the issue of certification confirming calibration with equipment traceable to UKAS standards A GasCheck G Calibration Kit offers a means of checking and calibrating the instruments against a known reference however Ion Science Ltd strongly recommend the instrument is returned to an approved service centre on an annual basis for general maintenance and calibration Contact Ion Science Ltd Postal address Ion Science Ltd The Way Fowlmere Cambridge SG8 7UJ UK By Telephone 44 0 1763 208503 By Fax 44 0 1763 208814 By Email info ionscience com Page 4
20. of 20 GasCheck G 1 2 and 3 Graphical GasTech Australia Instrument Description The GasCheck G is a range of portable hand held gas detector instruments predominantly used for detecting gas leaks and can detect almost all gases to varying degrees Being a hand held instrument it is powered by standard AA size batteries and will accept both Alkaline and Nickel Metal Hydride rechargeable ty pes The GasCheck G uses thermal conductivity as it s means of detecting gas which offers a robust sensor technology that requires practically no maintenance beyond annual servicing All GasCheck G models have an easy to use graphical interface with an intuitive keypad allowing simple function selection and adjustment The GasCheck G is a range of instruments that can be upgraded to add features without the need to be returned to the supplier and without having to modify the internal firmware GasCheck G has an LCD display LED indicator and audible sounder that indicates the detected signal Common applications where The GasCheck G is already used include 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 Medical Testing of membrane materials and sealing of glove boxes Pneumatic Valve seal testing The GasCheck G is calibrated against a 5 E 4 cc s Helium le
21. of 20 11 08 V1 7 conformity updated GasCheck G V1 8 GasCheck G BSEN 61326 23 9 08 V1 31 N A V1 6 1997 to BSEN 61326 2006 Change to page 2 onl Page 21 of 20
22. r plastic The battery holder can be reconnected to the GasCheck G by firmly pressing the two haWes of the PP3 clip together Care should be taken to ensure the polarity is correct see the PP3 diagram right The battery pack is then laid within the instrument and the battery cover refitted be careful not to trap wires when refitting the battery cover Page 19 of 20 Battery holder PP3 clip Battery holder PP3 clip GasCheck G 1 2 and 3 Graphical GasTech Australia Instrument Specification Operating temperature 0 to 50 C 32 to 122 F Storage temperature 25 to 70 C 13 to 158 F Instrument case Polyurethane Dimensions L 390 x W 60 x H 50 mm L15 35 x W2 35 x 2 0 Weight 0 5 kg 1 0 Ib Ingress ratings IP20 Length of long probe 300 mm 12 Detection type Thermal conducti ity 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 Akaline or NiMH AA Qty 4 Battery life at 20 C 68 F 40 Hours 20 hours when using the backlight Replacement parts Part Item Number Long probe A 08045 Short probe A 08043 Replacement battery holder 3000 1 BH 01 Nozzle 08024CPC8 Box Spanner A 08029 Accessory Item Number CalCheck A 21500 specifying gas leak rate and pressure Page 20 of 20 GasCheck G 1 2 and 3 Graphical GasTech Australia Update Log Firmware V1 4 Update V1 5 Update GasCheck G Declaration
23. red and displayed as leak rates The diagram below shows the basic functionality of the GasCheck G s 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 applied 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 Air flow Probe Disp lay 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 GasCheck G as leak rates or gas concentrations PLEASE NOTE Some gases have similar thermal properties to that of air therefore the GasCheck G can only detect larger concentrations of these gases Some gases have positive and other gases negative signals To simplify the instruments function GasCheck G only displays changes as positive readings The GasCheck G can NOT differentiate between gases Selecting a specific gas on the GasCheck G allows the instrument to calculate concentrations of that gas only if that gas is being detected Page 7 of 20 GasCheck G 1 2 and 3 Graphical GasTech Australia Instrument Main Menu Once the GasCheck G has run through its Start up routine it will display its normal Running screen used
24. sc key to exit to the Main menu Failing to select the correct battery type will not damage the instrument or affect it s ability to detect gas however it will cause the battery indicator to read incorrectly Battery full View Data 3 The GasCheck G instrument has the ability to data log 10 readings within its internal memory To store 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 Whe the memory is full the Data symbol will flash The stored data can be viewed buy scrolling through the logged readings using the Up and Down keys To delete the stored data press and hold the ENTER key the Trash can symbol will flash continue holding the ENTER key until the data is deleted Press the Esc key to exit to the Main menu Units 3 GasCheck G instruments have the capability of displaying detected readings in a variation of units ppm cc s mg m 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 Please note the Custom Calibration routine automatically selects the type a calibration depending on this setting See the Calibration section of this manual on page 16 cc sec Cubic Centimetres 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 Millilitres p
25. sensitivity levels X100 times one hundred is most sensitive X10 times ten is mid range and X1 times one is least sensitive See the sensitivity of various gases on the table on page 12 regarding Gas Selection Battery status When the battery symbol is filled in the battery is full when just an outline the battery is exhausted Backlight The backlight sy mbol shows the status of the backlight even in bright daylight Gas measurement The GasCheck G2 and G3 measure the leak rate of gas leakage in which ever units are selected Sound indication This symbol shows if the sounder is on or off if the semi circle 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 onl The GasCheck G1 has no measured units so relies on this bar graph to indicate leakage when gas is detected and the bar graph has reached it s maximum level a different sensitivity level can be selected to give a wider detection range Peak hold When selected peak hold displays the maximum measurement on the display Press the ENTER key resets the reading but also logs the peak reading in memory Page 9 of 20 GasCheck G 1 2 and 3 Graphical GasTech Australia Functions The GasCheck G instruments have a variation of functionality e
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