M07655 Tetra 3 manual Issue 3 USA 100107 revised.qxp
Contents
1. C011018 12 V DC input single way charger C011020 Single way charger with 230 V UK style power supply C011021 Single way charger with 230 V EUR style power supply C011022 Single way charger with 110 V US style power supply C011023 Single way charger with 90 260 V inline power supply C011035 Single way charger with 230 V inline power supply C011036 Single way charger with 110 V inline power supply C01296 Vehicle lighter socket lead C011019 Single way combined charger and PC interface C011024 Single way charger interface with 230 V UK style power supply C011025 Single way charger interface with 230 V EUR style power supply C011026 Single way charger interface with 110 V US style power supply C011027 Single way charger interface with 90 260 V inline power supply C011037 Single way charger interface with 230 V inline power supply C011038 Single way charger interface with 110 V inline power supply i modules 5011424 0 100 LEL methane S011436 0 100 LEL propane S011437 0 100 LEL pentane S011439 0 100 LEL butane S011440 0 100 LEL ethylene S011423 0 25 oxygen 02 S011421 0 100ppm hydrogen sulphide H2S S011422 0 500ppm carbon monoxide CO S011953M 0 50ppm H2S 0 500ppm CO dual i module There are alternative combustible sensors for different applications Contact Crowcon with the instru ment serial number to check correct sensor type gt CROWCON Gas Detection You Can Trust Accessories and spare parts Tetra 3 Samp2. Tetra 3 Personal Multigas Monitor Thank you for purchasing the new Tetra 3 Personal Multigas Monitor Tetra 3 has redefined portable gas monitoring and will give you years of unparalleled service and reliability Please read the instructions carefully before use Keep the manual for future ref erence Unpacking Remove the Tetra 3 Personal Multigas Monitor from the packaging The Tetra 3 accessories will be located in the bottom of the box Check the contents are complete you should have e Tetra 3 unit e Charger and power supply e A configuration report detailing the sensors installed alarm settings and a calibration certificate e Optional accessories such as aspirator plate aspirator bulb and comms lead Battery check The Tetra 3 Personal Multigas Monitor has a lithium ion rechargeable battery Tetra 3 will operate for a minimum of 16 hours when fully charged Tetra 3 uses a Li ion battery pack and should arrive with sufficient charge so that the unit can be used straight out the box However if this is the first time you have used the Tetra 3 unit you may need to charge the batteries to attain the full 16 hour operating time The actual operating time will depend on the types of sensors installed Warning rechargeable units Do not attempt to use any other charger with this unit except the one sup plied by Crowcon Failure to comply could invalidate safety certification and may result in permanent dama
3. Tetra 3 fails calibration Gas cylinder empty Check gauge replace bottle as needed Gas cylinder out of date Check date and replace as needed Hose blocked or kinked Ensure no restriction to flow Calibration drifted Calibrate Tetra 3 Stabilization time too short Reset using PC software Tetra 3 passes gas test Menu Zero not performed Select Zero from menu but will not enter Field calibration not enabled Send for re configuration calibration mode in Tetra 3 unit Note Remove regulator from gas cylinder when not in use over a prolonged period For parts list see section XI gt CROWCON 19 Gas Detection You Can Trust Maintenance and Calibration Tetra 3 VII Maintenance and Calibration Tetra 3 is designed to operate almost maintenance free under most conditions However some small items of routine maintenance are recommended General To keep the display panel and operator button free from dirt build up regular ly wipe over your Tetra 3 unit with a damp cloth Before opening the instrument case to change any internal components it is essential to take precautions to ensure ESD protection Zero and calibration Tetra 3 is supplied with an auto zero function on start up This function can be configured to operate automatically on user confirmation see quick start guide or can be disabled This configuration can be set with the Crowcon Portables PC software see section VIII Tetra 3 also has a zero function in t
4. 3 unit Chest harness Use the M3 fixing on the back of your Tetra 3 unit to attach the chest harness plate Create a chest harness by attaching one strap to the top Kr connectors to go around the Bi bi neck and the other to link around the waist using the X side connectors Adjust the VE lengths until the Tetra 3 unit is in a comfortable working position Shoulder neck connectors Universal harness plate Shoulder strap With the universal harness plate in place attach the shoulder strap accessory onto the top connectors Adjust to a comfortable working position See accessories section XI for full list 14 gt CROWCON Gas Detection You Can Trust Tetra 3 Flow sampling Vi Flow sampling Attaching the flow adaptor plate To perform manual sampling using Tetra 3 a flow adaptor plate must be fitted onto the front of the instrument Flow adaptor Gas in 1 To fit the flow adaptor plate clip the plate in place over the sensor grills and screw the thumbscrew until the plate is tightly fitted into place 2 Attach the sampling tube or flow accessory onto the gas inlet nozzle Attach the aspirator bulb onto the gas outlet nozzle 4 To remove the flow adaptor plate unscrew the thumbscrew and lift the plate away from the instrument w The sampling tube supplied is normally a 2m 6ft length Longer lengths of sampling tube can be provided but will increa
5. apply gas to the Tetra 3 whilst the progress bar is counting down gt CROWCON 17 Gas Detection You Can Trust Field calibration Tetra 3 5 Wait for the progress bar to complete typically 30 45 seconds A pass or fail message will appear To continue using the instrument disconnect the test gas and press the main button This will return the unit to its normal operating mode The unit is comparing what it measures from the bottle with the standard gas values it knows should be in the bottle 6 3 How to perform a field calibration test To perform a field calibration test you must first Zero your Tetra 3 unit 15 minutes or less before commencing the gas test instructions 18 Follow steps 1 to 3 given in 6 2 Tetra 3 will display an alternate screen message Calibrate Click to Confirm In 10 seconds Press the button within 10 seconds to confirm Calibration If the button confirmation for calibration is not made within 10 seconds then the process will revert to gas test as in 6 2 Apply calibration gas following step 4 in 6 2 Tetra 3 will display a progress bar at the bottom the names of the gas sensors fitted are shown in reverse image with a cross beside each Operate the Trigger regulator and apply gas to the Tetra 3 whilst the progress bar is counting down As gas flows the Tetra 3 allows the sensors to respond and then adjust the value for each gas channel to match the stored calibration gas
6. aspirator Configuration and data event logging is handled by Crowcon Portables PC soft ware the PC communication link being provided through the charger Tetra 3 s shape and design makes it comfortable to wear and as non intrusive as possible with a non slip grip for better handling Extra accessories such as shoulder strap and chest harness can be purchased Tetra 3 has been designed from top to bottom to bring you ease of use low maintenance and extremely high reliability Through an innovative and rigorous design process we have combined several features from our reliable Tetra and Gasman products to produce the new Tetra 3 i module gas sensor Tetra 3 uses unique plug and play i module sensor technology Each sensor unit incorporates its own intelligent processor holding sensor configuration and cal ibration data Different sensor modules can be purchased and once inserted are immediately ready to run Tetra 3 can operate with up to three sensors and display simultaneously information and gas readings for all the sensors on one screen This means no redundancy and assured future investment in your Tetra 3 unit allowing you to swap sensors between units or configure your unit as 6 gt CROWCON Gas Detection You Can Trust Tetra 3 Introduction appropriate to your current needs Plug and play will ease maintenance time and cost and the intelligent modular system will remove the need to calibrate each sensor Additional
7. auto zero by selecting the Zero function from the menu When Zero is completed the instrument will return to normal operation 2 5 Logging Tetra 3 incorporates data and event logging which can be accessed using the communications link with Portable PC software See section VII The Tetra 3 event log records the time and date for a number of operating and diagnostic events including e Switch on and switch off e Level 1 Level 2 and Time Weighted Average Alarms alarm on alarm off and the peak level during the alarm e Zero calibration and gas test with success or failure e Catalytic bead saver on and off e The battery condition is logged every time the Tetra 3 is switched on or off and when it is placed into or removed from the charger e Datalogging records reading sets data at a predetermined time interval usually set to one minute gt CROWCON 11 Gas Detection You Can Trust Batteries Tetra 3 IH Batteries 3 1 Rechargeable batteries Tetra 3 uses a rechargeable Lithium ion battery which must only be charged using a Crowcon battery charger A 5 hour recharge from flat will provide at least 12 hours operating time A fully charged battery will provide more than 16 hours of continuous use Charging the batteries 1 2 3 Ensure you are in a safe area Plug the charger power supply into a mains socket Connect the power supply to the charger Insert the Tetra 3 into the charger Switch on the charg
8. value within each sensor i module Provided all channels calibrate successfully within the allowed time the calibration will be designated successful If any channel does not calibrate successfully it will remain marked with a cross and screen a message Gas test failed and Send for calibration will be displayed A tick will appear against each channel as the unit passes the test To abort the Calibration test press the button at any time whilst the test is in progress gt CROWCON Gas Detection You Can Trust Tetra 3 Gas test calibration troubleshooting 6 4 Cal Test This can arise if having selected and confirmed calibration one or more but not all of the sensors are not calibrate enabled In this case calibrate enabled chan nels will calibrate and non enabled channels will Gas Test bump only Oxygen sensors are by default not calibrate enabled as they are calibrated to 20 9 in fresh air in Zeroing 6 5 Gas test calibration troubleshooting Symptom Possible Cause Action No response to gas Gas cylinder empty Check gauge replace cylinder as needed Hose blocked or kinked Ensure no restriction to flow Tetra 3 fails gas test Gas cylinder empty Check gauge replace cylinder as needed Gas cylinder out of date Check date and replace as needed Hose blocked or kinked Ensure no restriction to flow Calibration drifted Calibrate Tetra 3 Gas flow not started Repeat test starting gas immediately immediately
9. will activate the alarm signals Alarm signals Alarm icon _ The red and blue A alarm LEDs will flash the sounder will emit a loud fast series of beeps the internal vibrator alarm will activate The operator screen will display the gas in alarm and the alarm level See the Gas example figure to the left under alarm 4 gt CROWCON Gas Detection You Can Trust Tetra 3 Switching off 1 When the gas level returns to normal press the operator button This will reset your Tetra 3 unit to normal Run mode If gas levels are still in alarm the button will have no effect For any one gas there are The Tetra 3 alarm is set to latch by default normally two alarm The unit will still continue in alarm mode thresholds These are even when gas levels return to normal indicated by the alarm until the alarm is cleared by pressing the icons shown operator button 88 3 Switch off unit and storage Switching off unit 1 Press and hold the button for 5 seconds The shut down menu appears continue to hold button until the unit counts down to shut off 4 sec H2S ppm 02 Storing conditions In order to optimize sensor performance and lifetime your Tetra 3 unit should be stored in a safe non hazardous area 0 30 C 10 90 RH 4 Additional information For battery recharging information go to section Ill For fixing accessories go to section V For sampl
10. 92 Pandan Loop 05 01 Pantech Industrial Complex Singapore 128381 Tel 65 6745 2936 Fax 65 6745 0467 Email sales crowcon com sg Web site www crowcon com
11. Electrochemical gas sensors contain chemicals Extreme levels of humidity can also cause problems The sensors are rated for an average ambient of 15 90 R H However they are used from the tropics to deserts to tundra without this normally being a problem Water should not be allowed to collect on the sensors as this may impede gas diffusion Persistent exposure to high levels of toxic gas will shorten the life of toxic sen sors If the high level gas is corrosive e g hydrogen sulphide damage may occur over time to metal components Sensors may be cross sensitive to other gases If unsure contact Crowcon or your local agent 28 gt CROWCON Gas Detection You Can Trust HALMA GROUP COMPANY UK Office Crowcon Detection Instruments Ltd 2 Blacklands Way Abingdon Business Park Abingdon Oxfordshire OX14 1DY United Kingdom Tel 44 0 1235 557700 Fax 44 0 1235 557749 Email crowcon crowcon com Web site www crowcon com Rotterdam Office Crowcon Detection Instruments Ltd Vlambloem 129 3068JG Rotterdam Netherlands Tel 31 10 421 1232 Fax 31 10 421 0542 Email eu crowcon com Web site www crowcon com USA Office Crowcon Detection Instruments Ltd 21 Kenton Lands Road Erlanger Kentucky 41018 1845 USA Tel 1 800 527 6926 or 1 800 5 CROWCON 1 859 957 1039 Fax 1 859 957 1044 Email salesusa crowcon com Web site www crowcon com Singapore Office Crowcon Detection Instruments Ltd Block 1
12. M07655 December 2006 Issue 3 Tetra 3 Personal Multigas Monitor F PCROWCON JE CROWCON Gas Detection You Can Trust Safety Certification Tetra 3 is classified to both US standards by Underwriter Labora Class 1 Groups A B C D Division locations Before use read the manual to ensure a full understanding of how to operate the unit and as to any limitations of use ories and Canadian standards by CSA as suitable for use in sho amp ONLY AS TO INTRINSIC SAFETY FOR USE IN HAZARDOUS th LOCATIONS UL CLASS I DIV I GROUPS A B C D T4 4F 20 C lt Ta lt 131 F 55 C 606 WARNING UNDERSTAND MANUAL BEFORE OPERATING WARNING ONLY CHARGE BATTERY IN A NON HAZARDOUS AREA DEROWGCORN 0X14 1DY UNTED KINGDOM tai aaea FITTED WITHOUT A Pe ne SENSO 22 2 No152 WHEN FITTED WITH A CONBUSTIBLE SENSOR tai aaea T4 Ex ia d IIC T4 CSA 2006 1843315 4F 20 C Ta 131F 55 C INTRINSICALLY SAFE CLASS I DIV 1 GROUPS A B C D T4 WARNING CHARGE BATTERY ONLY IN A SAFE AREA CAUTION READ AND UNDERSTAND MANUAL BEFORE OPERATING Exia CE 1180 DCROWCONI oxis 1Y uNTED Knoon Warning To avoid possible personal injury Substitution of components may impair intrinsic safety To prevent ignition of flammable or combustible atmos pheres read understand and adhere to the manufacturer s ive maintenance instructions The device is not intended for use in atmospheres con aining an oxygen c
13. clip and 3 sensors Housing degree of protection Ingress protection IP65 IP67 Operating temperature 20 C to 55 C 4 F to 131 F Humidity 0 99 RH non condensing for continuous operation Display 128 x 64 pixel Warm up time 45 seconds approximately Response time typical T90 appx 20 seconds for most toxic sensors 10 seconds for oxygen Repeatability 2 FSD 6 months Explosion protection Intrinsically Safe ATEX Essential Health and Safety Requirement clause 15 9 Safety certificate no Baseefa05ATEX0187 IECEx BASO5 0037 Approval codes Europe ATEX II 2G EEx ia d IIC T4 Tamb 20 C to 55 C USA Class 1 Division Groups A B C D Canada Class 1 Division Groups A B C D Standards Safety EN50014 EN50020 EN50018 94 9 EC USA UL913 Canada CSA22 2 152 Operation EN50270 EN50271 gt CROWCON Gas Detection You Can Trust Tetra 3 Accessories and spare parts XI Accessories and spare parts Accessory list Crowcon part number Description 5011952 C011062 C03327 Aspirator assembly Tetra 3 gas test accessory kit Quad gas mixture for gas test accessory kit 34 litre bottle 50 LEL methane 250ppm carbon monoxide 15ppm hydrogen sulphide 18 oxygen balance nitrogen For calibration gas contact Crowcon as the required gases depend upon your sensor com bination Single way chargers
14. ed and serviced by qualified personnel only Read and understand instruction manual completely before operating or servicing ATTENTION Pour des raisons de s curit cet quipement doit tre utilis entretenu et r par uniquement par un personnel qualifi Etudier le manuel d instructions en entir avant d utiliser d entretenir ou de r parer l quipement To avoid damage to the detector Do not expose the detector to electrical shock or severe mechanical shock e Do not attempt to disassemble adjust or service the detector unless instructions for that procedure are con tained in the manual and or that part is listed as a replacement part Only use Crowcon replacement parts Do not immerse the detector in liquids e The detector warranty will be voided if customer per sonnel or third parties damage the detector during repair attempts Non Crowcon repair service attempts void this warranty Tetra 3 Personal Multigas Monitor Contents MP a 1 Quickstart guides ss 2 o a A 6 OPS watt 8 Batterie Se pen een 12 Alarm indications ora datado 13 FIXING ACCESSOrIeS ns 14 Flow sampling sli 15 Maintenance and calibration 20 PC interface and software 21 i module replacement 22 AAA AN 24 Accessories and spare parts 25 Troubleshooting guide asii 27 Appendix Limitations of sensors 28 Tetra 3 Unpacking
15. er s power supply The unit would normally be left switched off for charging When charging is complete the red LED is extinguished Early units had a green LED illuminate on completion of charge If the unit is switched on during charge the normal display battery icon sweeps from empty to AE full On disconnecting the charger socket power supply this display icon will update in 20 seconds to show actual charge state In Run mode the battery icon will display six bars when it is full 4 Remove the Tetra 3 from the charger and switch on to use a Battery fully charged Tetra warning message Battery full x E A Low battery 25 y needs recharging The charging time will be longer if the unit is switched on during J gt CROWCON Gas Detection You Can Trust Tetra 3 Alarm indications IV Alarm indications Tetra 3 provides two instantaneous alarm levels for each installed sensor desig nated level 1 and level 2 For toxic gas sensors there are also two time weight ed average alarms TWA one for short term exposure STEL based on a 15 minute time weighted average and the second TWA alarm is for long term exposure based on a 8 hour time weighted average Alarm configurations are set via the Crowcon Portables PC software The following settings can be made Alarm thresholds for each sensor Level 1 a amp and level 2 alarms can be set for each individual gas sensor Alar
16. f auto zero is enabled default the unit will display the auto zero menu Press the operator button with a single click to confirm auto zero If the operator button is not pressed within the 10 second time out Tetra 3 will proceed directly to Run mode without performing zero Auto zero AUTO ZERO gt A Clickto ree gt AS AUTO ZERO K Auto zeroin 0 0 progress AUTO ZERO er Sav CH4 y Co Y Hs y 02 confirm i 7 secs AUTO ZERO y No auto zero CH4 LELICO ppm pp 0 0 o 0 0 20 9 H2S ppm 02 Run mode gt CROWCON 3 Gas Detection You Can Trust In the event of an alarm Tetra 3 Run mode Your unit is now ready to use l encore Below is a typical screen display showing the unit in normal gas monitoring Run mode Warm up CH4 LEL CO ppm ror a3 0 0 0 running normally 0 0 20 9 H2s ppmlo2 Battery co Tre 3 Auto zero Familiarize yourself with the gases being 0 0 monitored in your unit and make sure you understand site health and safety procedures in the event of alarm conditions Confidence signals In normal Run mode Tetra 3 will emit a short beep every 10 seconds and the OK icon flashes to show operational health 2 In the event of an alarm Alarm signals In the event of gas concentrations exceeding the alarm thresholds for any gas being monitored Tetra 3
17. ge to the unit gt CROWCON 1 Gas Detection You Can Trust Quickstart guide Tetra 3 Quickstart guide 1 Getting started Review your Tetra 3 unit Top view 4 Alarm LEDs N Operator LCD N display screen Side view Pocket clip lever Operator button Front plate Switching on your unit Tetra 3 requires little setting up follow these simple steps to get your unit ready for use 1 Ensure the unit is in clean air 2 Switch on Press and hold the operator button until the red LED flashes The operator display screen will light up and the unit will begin a warm up sequence 2 gt CROWCON Gas Detection You Can Trust Tetra 3 Quickstart guide Tetra 3 warm up sequence LEDs Alarm test a The unit will test the a amp Sounder Alarm test alarm LEDs sounder i ES W vibration alerts and the rd operator display screen The sounder may be silenced by pressing the button Vibration test b The unit will continue through a warm up sequence as shown below this will take approximately 45 seconds Tetra3 vs 1 00 gt CROWCON WD Tetras Gas Detection You wed 5 Sep 2005 14 02 49 qa y NEXT CAL AO PPE AUTO ZERO e 1 gt 4 ei A Click to ely y lt A 5 Jan 2005 gt confirm H2S ppmloo in 7 secs gt c Auto zero I
18. he menu See section Il item 2 4 Crowcon recommends as a minimum a monthly gas test to confirm sensor operation A test gas of known composition needs to be applied to verify sen sor response and alarm function Instrument calibration of all sensors should be performed at regular 6 monthly intervals Calibration method Tetra 3 calibration can either be performed using the Portables PC software or by use of the Gas Test Accessory Kit Using the Portables PC software allows cal ibration using either single gas mixtures and calibrating each sensor in turn or using a multigas mixture for simultaneous calibration The Gas Test Accessory Kit allows calibration on a quad gas mixture for the standard 4 gas combina tions of flammable oxygen carbon monoxide and hydrogen sulphide 20 gt CROWCON Gas Detection You Can Trust Tetra 3 PC interface and software Vill PC interface and software Tetra 3 can be connected to a PC using the single way charger unit with option al PC interface The charger unit is fitted with a D type 9 pin male RS232 sock et which is located at the rear of the charger see diagram below The PC requires Crowcon Portables PC software A USB RS232 adapter is also available from Crowcon The software provides the user with access to reconfigure alarm levels opera tion run calibrations print reports and to access data and event log files Set up 1 Install Portables PC software on PC and attach
19. i modules can be purchased pre calibrated from your local supplier Reliable anti shock mechanics and robust housing The Tetra 3 housing is built from resilient material giving it strength and flexi bility to withstand the hardest of working conditions water and dust tight to IP65 and IP67 and with a non slip grip The case has been carefully designed to make servicing easy and at the same time very rugged If the unit is dropped there will be no disruption of power or function ensuring reliability and service for years to come Software The processes used to design and develop the Tetra 3 software ensure a high degree of reliability and robustness Thus Tetra 3 has been designed to be a truly reliable personal gas monitoring system The internal circuitry includes an exter nal watchdog where the software monitors for any malfunction within the unit and will display an error warning to the user should they occur gt CROWCON 7 Gas Detection You Can Trust Operation Tetra 3 IH Operation 2 1 Switch on sequence Ensure the unit is in clean air Switch on Press and hold the operator button until the two red LEDs flash The instrument begins with testing all the LCD segments on the operator display screen the red and blue alarm LEDs sounder and internal vibrator alert for about 5 seconds The sounder may be silenced by pressing the button The unit enters a warm up mode and displays a sequence of scree
20. ing section go to section VI For calibration information go to section VII For troubleshooting guide go to section XII gt CROWCON 5 Gas Detection You Can Trust Introduction Tetra 3 I Introduction Thank you for purchasing the new Tetra 3 Personal Multigas Monitor Tetra 3 is a portable multigas detector designed to be carried or worn by individuals working in hazardous environments such as confined spaces It is suitable for use in Division 1 and 2 hazardous areas Tetra 3 can monitor up to four differ ent gases and display the readings simultaneously on a display screen Alarm warnings are given through a combination of a loud audible alarm a bright visual alarm of blue red flashing LEDs and an internal vibrator Tetra 3 is fitted with modular plug and play gas sensors Each sensor carries an intelligent processor which contains calibration and sensor information Tetra 3 is operated using a Lithium ion rechargeable battery A charger is avail able with a range of options At Crowcon we recognized the need for a reliable and robust personal moni toring system which is both lightweight compact easy to use and cost effec tive Tetra 3 has a single operator button and an intelligent user friendly display with backlight Gas levels are continuously monitored providing normal gas readings peak readings and time weighted averages TWA Tetra 3 is a diffu sion sampling instrument with an option to use a hand operated
21. is issued for use The Tetra 3 itself will determine Pass Fail status for the bump test In order to perform successful bump tests ensure e The quad gas mixture used has the correct gas concentration and that it is within the validity date specified by the supplier e The gas flow path is leak tight It is important to check that the flow plate is properly fitted to the Tetra 3 and the outlet tubing is not restricted in any way nor additional tubing length used The Bump Test Accessory Kit comprizes a gas cylinder containing the quad gas mix a Trigger regulator with interconnect tubing a magnet used to activate Test mode an aspirator plate to attach to the Tetra 3 and a vent line The Trigger regulator can be operated in two ways 1 squeeze and hold allows gas flow as long as the lever is held in or 2 by lifting the lever the flow is locked on 6 2 How to perform a gas test 1 Ensure your Tetra 3 unit is switched on and in normal operation 2 Clip the flow plate onto the front of the unit and attach the hose from the Trigger regulator Attach the outlet hose to vent gas away do not extend this hose and do not restrict or allow kinks 3 Swipe the magnet over the bubble label on the front of the unit near the main button Your Tetra 3 will begin the Gas Test and show BUMP TEST on the display A countdown progress bar will also appear at the bottom of the display 4 Operate the Trigger regulator and
22. ling accessories 5011952 M04897 C01757 C01097 M04032 C03328 C01245 Aspirator plate Aspirator plate and gasket Telescopic aspirator probe 3 foot sample probe Aspirator hose please specify length in feet 6 m drop line Water trap Carrying and wearing C01952 Universal harness plate C01843 Shoulder strap C01844 Chest harness strap kit Communications E07532 PC interface head C02097 USB to RS232 adaptor C01832 Portables PC software CD Spares consumables S011960 C01851 C01853 M04482 26 Rechargeable Li ion battery pack assembly Aspirator bulb Dummy sensor module i module O ring seal CROWCON Gas Detection You Can Trust Tetra 3 Troubleshooting guide XII Troubleshooting guide Symptom Cause Action error message Instrument won t switch on Flat battery Recharge or replace battery No confidence beep Function disabled Reconfigure with PC software Gas reading when no gas Zero drifted Restart instrument in clean present air Unstable inaccurate gas Sensor failure Do not use exit hazardous reading area immediately Return instrument for recalibration or sensor replacement Auto zero failed Zeroing in Switch off and restart in contaminated clean air atmosphere Cannot Auto zero due to Zeroing in Switch off and restart in alarm contaminated clean air atmosphere Calibration expired The calibration due Send for calibration date has passed LCD too faint dark Con
23. m any packaging If you are installing a new i module into a currently unused slot you will first need to remove the dummy i module Follow the i module removal instructions to do so 2 Ensure the gasket is in place in the sensor Place the new sensor in the vacant space and push down gently 3 Attach the ribbon connector by squeezing the two retaining lugs on the module board toward each other and pulling out slightly Slide the ribbon into the slot Push the retaining lugs back toward the sensor this will grip the ribbon firmly 4 If using a dual sensor always place this in the slot nearest to the display Warning Do not twist the connection ribbons Do not pull the i modules too far from the PCB board to prevent dam age to the cabling or electrical connections Re assembling the Tetra 3 unit 1 Ensure that all i modules are seated in their correct positions and all ribbon cables are folded neatly between the i modules and the main unit Put the battery and plastic holder back into their original positions 2 Switch on your Tetra 3 unit The new sensor will be automatically identified Check the filters and gaskets are all in good condition Replace if any items are faulty Refer to the troubleshooting guide if necessary gt CROWCON 23 Gas Detection You Can Trust Specification Tetra 3 X Specification Dimensions 71x 114 x 48 mm 2 8 x 4 5 x 1 9 inches Weight 295 g unit including pocket
24. m type This can be set to rising levels of gas concentra tion or as falling Oxygen are set to falling for deficiency monitoring as a default Alarm latching Alarms can be set to be latched or unlatched Latched alarms will require the operator button to be pushed in order to clear the alarm This is the default set ting Unlatched alarms will clear automatically when the gas hazard has passed Alarm mute The sounder can be set to mute for level 1 alarm only pressing the operator button during an alarm condition i e presence of hazardous gas will silence the sounder and stop the vibration alarm The alarm LEDs will continue to flash Alarm sounder tone Different tones can be selected to achieve the best performance for the monitoring conditions available In the event of a Time Weighted Alarm TWA a In the event the 15 minute or the 8 hour TWA is triggered Tetra 3 will go into alarm and display the TWA icon with the toxic gas readings Neither the 15 minute alarm or 8 hour alarm can be cleared gt CROWCON 13 Gas Detection You Can Trust Fixing Accessories Tetra 3 V Fixing Accessories Belt clip Tetra 3 has a strong alligator clip located on the back of the unit Lifting the small lever will allow the unit to be attached to a belt more easily Universal harness plate Crowcon provide a universal harness plate which can be used with either a chest harness or a shoulder strap How to wear your Tetra
25. n Trust Display options Tetra 3 2 4 Display options Tetra 3 provides two additional selectable displays Peak display When Peak mode is selected the instrument shows the highest value for combustible and toxic gases and the lowest value for oxygen since the unit was switched on or since the last peak clear After 5 seconds the screen will display Peak Clear If you press the button within the 10 second countdown the peak value is cleared If the button is not pressed the display will revert to the stored peak value Whilst in Peak mode new higher gas values are stored Upon exit of Peak mode the stored peak values are not deleted This is useful for vertical entry checks where a whole instrument can be lowered down the shaft rather than just a sampling tube TWA display Shows the 8 hour time weighted average TWA for toxic gases monitored since last turn on 1 To view the additional display option menu double click the operator button 2 Press the operator button with a single click to scroll through the list When your choice is highlighted double click the operator button Peak display 1 Scroll 2 Select on O lo a a Cp twa S gt Zero bo caa The Tetra 3 operator screen will display the peak or TWA icon and the gas readings recorded 10 gt CROWCON Gas Detection You Can Trust Tetra 3 Event logging Zero The Tetra 3 instrument can perform an
26. ns see page 3 for more details At the end of warm up the auto zero menu will be displayed The auto zero function can be disabled or set Battery check to run automatically without user Use this time to confirmation auto zero menu will not appear check there is sufficient See section VIII PC Interface and software charge in the battery pack NB During the warm up sequence the date for next calibration will be displayed If the date has expired or has passed the Tetra 3 unit will display a warning message that calibration is due The instrument can still function but it is strongly recommended the unit is sent for calibration as soon as possible Tetra 3 can be set using the Portables PC software for the instrument to shut down automatically if the calibration date is passed to prevent further operation of the instrument Auto zero menu Press the operator button with a single click to confirm auto zero If the operator button is not pressed within 10 seconds Tetra 3 will proceed directly to Run mode without performing a zero Combustible and toxic sensors will be set to read zero and the oxygen sensor to read 20 9 NB If auto zero fails a warning message will be displayed and an X will appear against the sensor that has failed Switch off To switch off the unit press and hold the operator button for 5 seconds A shut down menu OFF IN will appear Continue to hold button until the unit cou
27. nts down to shut off gt CROWCON Gas Detection You Can Trust Tetra 3 2 2 Run mode The Tetra 3 unit will display up to four gas readings simul taneously on the operator display screen A typical four gas display is shown below LEL CO ppm 0 0 0 0 0 20 9 ppm 02 Each channel will display the gas name units and current value Familiarize yourself with the gases currently being monitored in your unit Ensure you understand site health and safety procedures For information on peak and TWA readings go to section 2 4 Confidence signals To reassure users the unit is working correctly the Tetra 3 unit will emit a short beep every 10 seconds and the OK icon will flash 2 3 Display symbol guide Batter Full y TETRA ay will emit warning bleeps Run mode Screen Icons X 1m a m Warm up Flashing icon Tetra3 running normally Battery Auto zero A full battery is represented by a battery icon showing a full six bars A low battery charge will show 1 to 2 bars When zero bars are shown the battery icon flashes The sounder If the battery becomes too low Tetra 3 will display a Battery low warning message and switch off TWA alarm gt Tetra 3 will display the TWA alarm when the 15 minute or 8 hour time weighted average alarm threshold is passed for toxic gases gt CROWCON Gas Detection You Ca
28. oncentration greater than 21 percent by volume Do not use the detector if it is damaged or something is missing contact Crowcon immediately Use only sensor modules specifically designed for your Tetra 3 Please see the section on replacement parts and accessories Periodically bump test the sensor with gas to confirm its ability to respond to gas by exposing the detector to a targetted gas concentration that exceeds the high alarm setpoint Manually verify that the audible and visual alarms are activated It is recommended that the detector be calibrated before first time use and then at least once every 90 days and only by qualified personnel For use in potentially explosive atmospheres where oxy gen concentrations do not exceed 21 v v Do not turn off the detector during a work shift Turning off the detector resets the time weighted average gas exposure values to zero Ensure that the sensor is not blocked Only the combustible gas detection portion of this instrument has been assessed for performance on methane according to C22 2 No 152 High off scale LEL readings may indicate an explosive concentration Protect the combustible gas sensor from exposure to lead compounds silicones and chlorinated hydrocar bons Although certain organic vapors such as leaded gasoline and halogenated hydrocarbons may temporar ily inhibit sensor performance in most cases the sensor will recover after calib
29. ration It is recommended that the combustible gas sensor be checked with a known concentration of calibration gas after any exposure to catalyst contaminations poisons sulfur compounds silicon vapors halogenated com pounds etc e Only charge battery in a non hazardous area Only charge the battery using a Crowcon supplied charger e Do not use any other charger Other chargers may damage he detector making it unsafe for use in hazardous areas Do not change or charge batteries in a hazardous loca ion Doing so may lead to fire or explosion e Extended exposure of the combustible sensor to certain concentrations of combustible gases and air may stress he sensor element which can seriously affect its per ormance If an alarm occurs due to a high concentra ion of combustible gases recalibration should be per ormed or if needed the sensor replaced Do not test the combustible sensor s response using a butane lighter Doing so may damage the sensor Prior to each days usage sensitivity must be tested on a known concentration of methane equivalent to 25 50 of full scale concentration accuracy must be within 0 to 20 of actual Accuracy may be corrected by recalibrating the instrument e Any rapid up scale reading followed by a declining or erratic reading may indicate a gas concentration beyond the upper scale limit which may be hazardous Caution CAUTION For safety reasons this equipment must be operat
30. se the time taken to get a sample from the point of sampling to the Tetra 3 instrument When using an extended length of tubing a response time test is recommended Gas of known concentration should be sampled along the full length of tubing to be used and the time taken for the sensor reading to reach the known gas levels should be noted This time should be used as the minimum for sampling before readings should be taken gt CROWCON 15 Gas Detection You Can Trust Flow sampling Tetra 3 Diffusion instruments When using the manual aspirator kit adopt a consistent style whilst using the hand aspirator Crowcon recommend squeezing once per second to achieve a flow rate of approximately 0 5 1 litre min At least 10 pumps per sample are recommended 16 gt CROWCON Gas Detection You Can Trust Tetra 3 Gas testing Tetra 3 Bump Test Accessory Kit The Bump Test Accessory is a gas testing kit designed to enable gas testing of the Tetra 3 multigas detector using a specially formulated high stability long life quad gas mix It can be used with Tetra 3 units having sensors for Combustible Oxygen Carbon Monoxide and Hydrogen Sulphide gases and all Tetra 3 units with these sensors can be bump tested using the kit 6 1 Bump testing Bump testing checks the sensor is responding within set limits to an applied gas of known composition This can be performed as often as desired but would usually be carried out each time the Tetra 3
31. the RS232 cable to the charger and PC 2 Switch on the Tetra 3 unit and drop it into the charger unit ensuring it is upright and the display is facing forward 3 Open the Portables PC software and either use the Wizard or the Engineer s Form select Tetra 3 and upload the configuration For more information on using the Crowcon Portables PC software see installed help file gt CROWCON 21 Gas Detection You Can Trust i module replacement Tetra 3 IX i module replacement 1 Ensure you are in a non hazardous safe area Switch off the unit 2 Remove any accessories such as the flow adaptor if fitted 3 Remove the cover by unscrewing the four M3 screws as shown in the drawing point O With care withdraw the battery with plastic holder downwards Removing an installed i module 1 Locate the i module connection ribbon squeeze the two retaining lugs on the i module board toward each other and pull out slightly this will release the ribbon 2 Gently pull the i module out of the unit There may be some resistance at first as the seal between the sensor and the front case is broken 22 gt CROWCON Gas Detection You Can Trust Tetra 3 i module replacement Installing or replacing an i module If replacing an i module with one of the same type instrument specific configuration will be retained If replacing with a different i module its default configuration will be loaded 1 Unwrap the i module fro
32. trast setting Adjust using Portables wrong PC software EA Fatal Auto shut al Service fh User alert A Calibration Le Configuration e J gt CROWCON 27 Gas Detection You Can Trust Appendix Limitations of sensors Tetra 3 Appendix Limitations of sensors Sensor limitations The sensors used in Tetra 3 have limitations common to all such gas sensors and users should be aware of the points listed below Crowcon can advise on particular situations and suggest alternative sensors if the instrument is likely to experience extreme conditions Tetra 3 uses a catalytic combustible gas sensor which measures the com bustibility of the gas For this reason readings displayed on the unit will be unreliable over concentrations of approximately 120 LEL Oxygen is necessary for catalytic sensors to operate A catalytic bead saver is used to disconnect power to the catalytic bead sensor in the event of over range to prevent burn out This locks out for 200 seconds after which a button press will reconnect power to the catalytic bead If the sensor power is reconnected when the unit is exposed to an over range gas concentration there is a risk of damage to the catalytic bead sensor Restart should be carried out in a known fresh air envi ronment Depleted oxygen levels can reduce the combustible gas reading and if oxygen levels are below safe breathing limits it should be assumed that the combustible reading is low
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