Tetra CO User Manual - MacGregor Industrial Supplies Ltd
Contents
1. press the operator button This will reset your Tetra CO unit to normal Run mode If gas levels are still in alarm the button will have no effect For any one gas there The Tetra CO alarm is set to latch by are normally two alarm default The unit will still continue in thresholds These are alarm mode even when gas levels return indicated by the alarm to normal until the alarm is cleared by icons shown pressing the operator button 8 a 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 Storing conditions In order to optimise sensor performance and lifetime your Tetra CO 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 II For fixing accessories go to section V For sampling 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 CO I Introduction Thank you for purchasing the new Tetra CO Personal Multigas Monitor Tetra CO is a portable multigas detector designed to be carried or worn by individuals work in areas where CO risks can occur Tetra CO can monitor up to four different gases and display the readings simul2. V Fixing Accessories Belt clip Tetra CO has a strong built in belt 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 Shoulder neck connectors Belt clip 2 lever Lever Waist connectors How to wear your Tetra CO unit Chest harness Slide the universal harness plate over the belt clip at the back of your Tetra CO unit The plate will lock automatically into place Create a chest harness by attaching one strap to the top connectors to go around the neck and the other to link around the waist using the side connectors Adjust the lengths until the Tetra CO unit is in a comfortable working position Shoulder strap With the universal harness plate in place on the belt clip attach the shoulder strap accessory onto the top connectors Adjust to a comfortable working position See accessories section X for full list 14 gt CROWCON Gas Detection You Can Trust Tetra CO Flow sampling VI Flow sampling Attaching the flow adaptor plate To perform manual sampling using Tetra a flow adaptor plate must be fitted onto the front of the instrument Gas in Flow adaptor 1 To fit the flow adaptor plate slide the top of the flow adaptor
3. 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 counts down to shut off gt CROWCON Gas Detection You Can Trust Tetra CO 2 2 Run mode The Tetra CO unit will display up to four gas readings Operation Screen Icons simultaneously on the operator display screen A typical S Warm up display with four sensors installed is shown below Flashing icon Tetra CO2 or running normally D Pump Battery Each channel will display the gas name units and current a value Familiarise yourself with the gases currently being Tg Auto zero 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 CO unit will emit a short beep every 10 seconds and the OK icon will flash The pump is running correctly when the icon is revolving 2 3 Display symbol guide Battery Full A full battery is represented by a battery icon showing a full THERA will emit warning bleeps 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 CO will display a Battery low warning messa
4. the connection ribbons Do not pull the sensor housing assembly too far from the PCB board to prevent damage to the cabling or electrical connections Re assembling the Tetra CO unit 20 1 Ensure the connection ribbons and cables are tucked in Slide the whole assembly back into the casing Ensure all gaskets are in place Replace the top and front cover grill Switch on your Tetra CO 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 Gas Detection You Can Trust Tetra CO Specifications X Specification Dimensions 122 x 128 x 57 mm 4 x 5 x 2 inches Weight 498 g rechargeable unit including belt clip and 4 sensors Housing degree of protection Ingress protection IP65 NEMA 4 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 30 seconds for CO Repeatability 2 FSD 6 months Standards Safety Operation gt CROWCON Gas Detection You Can Trust EN50270 EN50271 FCC Part 15 Subpart B This device complies with part 15 of the FCC Rules Op
5. 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 gt CROWCON 25 Gas Detection You Can Trust A HALMA 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 1 859 957 1039 or 1 800 527 6926 1 800 5 CROWCON Fax 1 859 957 1044 email salesusa crowcon com internet http Awww crowcon com Singapore Office Crowcon Detection Instruments Ltd Block 194 Pandan Loop 06 20 Pantech Industrial Complex Singapore 128383 Tel 65 6745 2936 Fax 65 6745 0467 Email sales crowcon com sg Web site www crowcon com
6. Crowcon Detection Instruments Ltd 2 Blacklands Way Abingdon OX14 1DY UK Tel 44 0 1235 557700 Fax 44 0 1235 557749 www crowcon com Email sales crowcon com Copyright Crowcon Detection Instruments Ltd 2008 All rights are reserved No part of the document may be photocopied reproduced or translated to another language without the prior written consent of Crowcon Detection Instruments Ltd Publication number M07686 First edition August 2008 Tetra CO Personal Multigas Monitor Contents UnpacKN Geeren eaea 1 Quickstart guide a5 caceis tinccssanveodiesenissies 2 POC ON ss lt cr dren seatantedoviacgexecneanneiens 6 l POV ATION eskaerarik 8 Il Batteries a 2actesesccascn coca tatesrdstinasr iosancnen Aaita tates 12 IV Alarm indications n 13 V FIRING ACCOSSONGS 2c2ccsccacctcanttaatiasineeste 14 VI Flow sampling vxcccarntrapasarennavnayts 15 VII Maintenance and Calibration 17 VIII PC interface and software 18 IX i module sensor replacement 19 X Specification ereere 21 XI Accessories and spare parts 22 XII Troubleshooting guide 6 24 Appendix Limitations of sensors 25 Tetra CO Unpacking Tetra CO Personal Multigas Monitor Thank you for purchasing the new Tetra CO Personal Multigas Monitor Tetra CO has redefined portable gas monitoring and will give you years of unparalleled service a
7. M07686 August 2008 Issue 1 Tetra CO Personal Multigas Monitor B CROWCON Gas Detection You Can Trust Safety information e Read and understand all instructions in the opera ion section of this manual before use e Observe all warnings and instructions marked on he unit and within this manual e Observe site health and safety procedures for gases being monitored and evacuation procedures ake sure you understand the screen display and alarm warnings e If this product is not working properly read the roubleshooting guide or call Crowcon e Ensure qualified service personnel change sensors and operating system e Ensure maintenance and calibration are carried out in accordance with the procedures in the manual Tetra IR CO monitor uses a newly developed i module with an infrared gas sensor for CO detection This version of Tetra is not designed or certified for use in a hazardous area CO is present in ambient air at a background concen tration of just under 400 ppm In any enclosed envi ronment the ambient CO concentration will increase as a result of respiration and if the room is poorly ventilated concentrations well in excess of 1000ppm 0 1 can occur CO levels in the outdoor air will also be enhanced by any emitted CO e g from vehicle exhausts or boiler flues venting to atmosphere so it is normal to see fluctuating levels of CO on the display whether indoors or outside
8. Plug the charger power supply into a mains socket 2 The charging socket is located on the bottom of the unit there is a small cover which can be opened to reveal the socket see figure below Pull back the cover and insert the lead into the socket Switch on the power The unit would normally be left switched off for charging and will display a battery icon on the display sweeping from empty to full When charging is complete a full battery icon flashes on the screen If the unit is switched on during charge the normal display battery icon sweeps from empty to full On disconnecting the charger power supply this display icon will update in 20 seconds to show actual charge state The unit is fully charged when the charging battery icon is flashing see example In Run mode the battery icon will display six bars when it is full Battery fully charged Tetra warning message Battery full Low battery Battery needs 25 recharging The charging time will be longer if the unit is switched on during charging 3 Remove the lead from the charging socket and replace the protective cover 12 gt CROWCON Gas Detection You Can Trust Tetra CO Alarm indications IV Alarm indications Tetra CO provides two instantaneous alarm levels for each installed sensor designated level 1 and level 2 For toxic gas sensors there are also two time weighted average alarms TWA one for short term ex
9. and alarm function Instrument calibration of all sensors should be performed at 6 month regular intervals Calibration method Tetra CO calibration can either be performed using the Portables PC software Using the Portables PC software allows calibration using either single gas mixtures and calibrating each sensor in turn or using a multigas mixture for simultaneous calibration A clip on flow plate is more convenient to use for calibration Pumped units with software version 1V08 or later where the default con figuration is that the pump is automatically switched off in Calibration or Gas Test mode Use the clip on calibration flow plate CO11005 unless the default configuration has been changed to maintain the pump running for Calibration or Gas Test in which case it is essential to use the CO1874 bel lows style flow plate gt CROWCON 17 Gas Detection You Can Trust PC interface and software Tetra CO Vill PC interface and software Tetra CO can be connected to a PC using an infrared optical link The Tetra CO unit has an optical communication port an IR window is located on the top of the unit The PC requires a Crowcon infrared PC interface part number MIS26003 and Crowcon Portables PC software The adaptor connects to an RS232 port a USB RS232 adaptor is also available from Crowcon The software provides the user with access to reconfigure alarm levels operation run calibrations print reports and to a
10. arm 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 screens 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 confirmation B Use this time to autozero menu will not appear See section Vill Check there is sufficient 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 CO 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 CO 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 CO will proceed directly to Run mode without performing a zero Flammable 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
11. ccess the event log Set up 1 Install Portables PC software on PC and install infrared adaptor Warning The infrared communications are not IrDA DO NOT install IrDA drivers if supplied with with the IR link kit 2 Switch on the Tetra CO unit and move to within range of the adaptor 3 Open the Portables PC software and either use the Wizard or the Engineer s Form select Tetra CO and upload the configuration For more information on using the Crowcon Portables PC software see installed help file 18 gt CROWCON Gas Detection You Can Trust Tetra CO i module sensor replacement IX i module sensor replacement Ensure you are in a non hazardous safe area Switch off the unit Remove any accessories such as the flow adaptor if fitted Remove the front cover grill by unscrewing the M3 2 mm Allen screw as shown the in the drawing point Nowe Unscrew the side retaining M4 3 mm Allen screws as shown in Remove the three sensor plate retaining screws as shown by point Ease the top away from the body point Press down lightly on the rubber seal protecting the sensor housing and slide forward to clear the internal chassis from the sensor plate aperture With care withdraw the whole instrument assembly Removing an installed i module 1 2 Locate the i module connection ribbon squeeze the two retaining lugs on the module board toward each other and pull out slight
12. eration is subject to the following two conditions 1 This device may not cause harm ful interference and 2 this device must accept any interference received including interference that may cause undesired operation This class A digital apparatus complies with Canadian ICES 003 Cet appareil num rique de la classe A est con forme a la norme NMB 003 du Canada 21 Accessories and spare parts Tetra CO XI Accessories and spare parts Accessory list Crowcon part number Description C01841 C01846 C01847 C011005 Aspirator Plate and Gasket Aspirator assembly for pumped units Aspirator assembly non pumped units Calibration Flow Plate Calibration gas contact Crowcon required gases depend on sensor combination Battery charger power supplies E01839 E01866 E01841 E01860 E01861 i modules S011423 S011421 S012015 S011422 5011425 S011432 External PSU for Tetra CO Charger UK 230 V 50 Hz External PSU for Tetra CO Charger US 110 V 60 Hz External PSU for Tetra CO Charger Euro 230 V 50Hz 230 V in line charger no plug fitted 110 V in line charger no plug fitted 0 25 oxygen 02 0 100 ppm hydrogen sulphide H2S 0 5 CO2 IR module 0 500 ppm carbon monoxide CO 0 20 ppm sulphur dioxide 0 1 ppm ozone 03 Sampling accessories C01847 C01757 C01097 M04032 C03141 FIL29001 FIL99008 Aspirator assembly for non pumped units Telescopic aspirator probe 3 foot Sample probe A
13. ge and switch off Internal pump This revolving icon indicates the internal pump is running If warning sound and display a warning message Check the D the pump or airway becomes blocked the unit will emit a flow adaptor and sample lines are free from dirt or water and that the sample line is not kinked or blocked Restart pump by pressing the operator button gt CROWCON Gas Detection You Can Trust Display options Tetra CO a TWA alarm P Tetra CO will display the TWA alarm when the 15 minute or 8 hour time weighted average alarm threshold is passed for toxic gases 2 4 Display options Tetra CO provides two additional selectable displays Peak display When Peak mode is selected the instrument shows the highest value for flammable and toxic gases and the lowest value for oxygen since the mode was selected This is useful for vertical entry checks where the whole instrument can be lowered down the shaft rather than just a sampling tube Deselecting Peak mode clears stored peak information TWA display Shows the 15 minute or 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 Peak display 1 Scroll 2 Select D 0 9 as S g7 CB twa k ft When your choice is highlighted double click the operator butto
14. ly this will release the ribbon Remove the retaining ring from the clips Unclip the i module from the gt CROWCON 19 Gas Detection You Can Trust i module sensor replacement Tetra CO iz two quick release fixings push the sensor mounting out the sensor plate housing taking care to retain any seals 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 from any packaging ensure the sensor is fully seated on the module board 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 Ensure the gasket is in place on the sensor push the sensor through the sensor aperture in the sensor plate housing Click the quick release fixings around the i module board ensuring the i module is held in place firmly and the sensor is still tightly located on the module board Replace the retaining ring on the clips Attach the ribbon connector by squeezing the two retaining lugs on the module board toward each other and pulling out slightly Slide the ribbon with the metal connectors facing away from the board into the slot Push the retaining lugs back toward the sensor this will grip the ribbon firmly Warning Do not twist
15. n The Tetra CO operator screen will display the peak or TWA icon and the gas readings recorded lt a 10 gt CROWCON Gas Detection You Can Trust Tetra CO Logging Peak test When performing a peak test such as a vertical entry check previous readings can be cleared on entry to the peak display option Zero The Tetra CO instrument can perform an autozero by selecting the Zero function from the menu When Zero is completed the instrument will return to normal operation 2 5 Logging Tetra CO incorporates event logging which can be accessed using the IR com munications link with Portables PC software See section VIII Tetra CO 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 The battery condition is logged every 15 minutes while the instrument is operating and certain configuration changes are also logged gt CROWCON 11 Gas Detection You Can Trust Batteries Tetra CO lll Batteries 3 1 Rechargeable batteries Recharge time for the Li ion batteries is less then 6 hours less if they are not fully discharged Rechargeable batteries will typically last 12 hours fully loaded with 3 or 4 sensors and a pump Charging the batteries 1
16. nd reliability Please read the instructions carefully before use Keep the manual for future reference Unpacking Remove the Tetra CO Personal Multigas Monitor from the packaging The Tetra CO accessories will be located in the bottom of the box Check the con tents are complete you should have e Tetra CO unit e Optional battery charger power supply for units supplied with rechargeable Li ion batteries e A configuration report detailing the sensors installed alarm settings and a calibration certificate e Optional accessories such as flow adaptor and aspirator bulb Battery check Tetra CO 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 CO unit you may need to charge the batteries to attain the full 12 to 14 5 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 power supply with this unit except the one supplied by Crowcon Failure to comply could invalidate safety certi fication and may result in permanent damage to the unit gt CROWCON 1 Gas Detection You Can Trust Quickstart guide Tetra CO Quickstart guide 1 Getting started Review your Tetra CO unit Top view Alarm LEDs D IR comms window UO ae Operator button Operator LCD di
17. plate into the small recess on the front of the instrument screw the thumbscrew until the plate is tightly fitted into place 2 Attach the sampling tube or flow accessory onto the gas inlet nozzle 3 Non Pumped diffusion instruments 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 The sampling tube supplied is normally a 2m 6ft length Longer lengths of sampling tube can be provided but will increase the time taken to get a sample from the point of sampling to the Tetra CO 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 CO Pumped instruments Tetra s inbuilt pump draws sample air in through the inlet nozzle of the flow adaptor plate and out through the outlet nozzle When using sampling equip ment if the inlet should become blocked with dirt water or a kink in the line the pump will automatically stop Tetra CO will emit a rapid series of beeps and display a warning message To restart the pump clear the blockage and press the operator button
18. posure 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 and level 2 alarms can be set for each individual Alarm thresholds for each sensor Level 1 a 2 gas sensor Alarm type This can be set to rising levels of gas concen tration or as falling Oxygen are set to falling for deficiency monitoring 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 ie 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 7 Ji In the event the 15 minute or the 8 hour TWA is triggered Tetra CO will go into alarm and display the TWA icon with the toxic gas readings The 8 hour TWA alarm cannot be cleared gt CROWCON 13 Gas Detection You Can Trust Fixing accessories Tetra CO
19. se of use maintenance and extreme reliability Through innovative and rigor ous design technology we have introduced several new features Reliable anti shock mechanics and robust housing The Tetra CO housing is built from resilient material giving it strength and flexibility to withstand the hardest of working conditions water and dust tight to IP65 and with a non slip grip The internal structure 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 6 gt CROWCON Gas Detection You Can Trust Tetra CO Introduction Software The internal software in Tetra CO has been designed and written in accordance with the requirement of IEC 61508 to ensure quality and integrity of operation Tetra CO has been designed to give a truly reliable personal gas monitoring system The internal circuitry includes an external watchdog 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 CO Operation 2 1 Switch on sequence Ensure the unit is in clean air Switch on Press and hold the operator button until the red LED flashes The instrument begins with testing all the LCD segments on the operator display screen the red and blue al
20. spirator hose please specify length in feet 6 m Drop line In line water trap and filter Spare filter element Carrying and wearing C01842 C01843 C01844 C01845 C01888 Universal harness plate Shoulder strap Chest harness strap kit Carry case rechargeable units Carry case non rechargeable units gt CROWCON Gas Detection You Can Trust Tetra CO Accessories and spare parts Communications MIS26003 Infrared adaptor for PC plugs into RS232 port C02097 USB to RS232 adaptor C01832 Portables PC Software CD Spares consumables S011330 Rechargeable Li ion battery pack assembly C01851 Aspirator bulb S011398 Sensor filter assembly C01853 Dummy sensor module M04787 Rubber sealing bung for charger socket M04482 i module O ring seal M04431 Sensor clip retaining ring For calibration gases consult Crowcon gt CROWCON 23 Gas Detection You Can Trust Troubleshooting guide Tetra CO XII Troubleshooting guide Symptom Action error message Instrument won t switch on Pump not running No confidence beep Gas reading when no gas present Unstable inaccurate gas reading Autozero failed Cannot autozero due to alarm Calibration expired Flow fail clear blockage LCD too faint dark Ti Fatal Auto shut A Service fh User alert a Calibration im Configuration lt a e Flat battery The pump is a PC configurable option Function disabled Zero drif
21. splay screen Side view Belt clip lever lt Front plate Switching on your unit Tetra CO 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 TK Press and hold the operator Ll e button until the red LED flashes The operator display screen will light up and the unit will begin a warm up sequence Bie 2 gt CROWCON Gas Detection You Can Trust Tetra CO Quickstart guide Tetra CO warm up sequence LEDs Alarm test A Sounder Alarm test a b The unit will test the alarm LEDs sounder vibration alerts and the operator display screen The sounder gt may be silenced by SS Y pressing the button The unit will continue through a warm up sequence as shown below this will take approximately 45 seconds W Vibrator Alarm test CROWCON Tetra Tetra wed vs 1 01 Gas Detection You 44 May 1300 bee ee rag Clickto S 21 Aug 2003 confirm g c Auto zero If 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 CO will proceed directly to Run mode without performing zero Auto zero H clickto j Pet lt mB E Kaw o y co fi AAT as Y
22. taneously 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 CO can be fitted with a wide range of modular plug and play gas sen sors Each sensor carries an intelligent processor which contains calibration and sensor information Tetra CO is is a rechargeable unit which contains its own internal charger a battery charger power supply is available for 110 V or 230 V a c see section XI for more information At Crowcon we recognised the need for a reliable and robust personal monitor ing system which is both lightweight compact easy to use and cost effective Tetra CO has a single operator button and an intelligent user friendly display with automatic backlight Gas levels are continuously monitored providing nor mal gas readings peak readings and time weighted averages TWA Tetra CO is available as a diffusion sampling instrument or with built in electric sampling pump Configuration and data event logging is handled by Crowcon Portables PC software the PC communication link being provided through a fast reliable optical link Tetra 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 CO has been designed from top to bottom to bring you a revolution in ea
23. ted Sensor failure Zeroing in contaminated atmosphere Zeroing in contaminated atmosphere The calibration due date has passed Sample tube is blocked with water or dirt or kinked Contrast setting wrong Recharge or replace battery Reconfigure with PC software Reconfigure with PC software Restart instrument in clean air Do not use exit hazardous area immediately Return instrument for recalibration or sensor replacement Switch off and restart in clean air Switch off and restart in clean air Send for calibration Clear blockage and press button to restart pump Adjust using Portables PC software gt CROWCON Gas Detection You Can Trust Tetra CO Appendix Limitations of sensors Appendix Limitations of sensors Sensor limitations The sensors used in Tetra CO 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 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
24. ws yo Run mode gt CROWCON Gas Detection You Can Trust In the event of an alarm Run mode Your unit is now ready to use Below is a typical screen display showing the unit in normal gas monitoring Run mode Familiarise yourself with the gases being monitored in your unit and make sure you understand site health and safety procedures in the event of alarm conditions Tetra CO units with an inbuilt pump will produce a low humming noise this is normal Confidence signals Tetra CO Screen Icons x Warm up Flashing icon Tetra CO2 running normally D Pump Battery 9 m Auto zero o o In normal Run mode Tetra CO 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 CO will activate the alarm signals Alarm icon Gas example under alarm Alarm signals The red and blue 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 figure to the left gt CROWCON Gas Detection You Can Trust Tetra CO Switching off 1 When the gas level returns to normal
25. ya Extension probes drop lines and water traps are available See accessories section XI 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 CO Maintenance and Calibration VII Maintenance and Calibration Tetra CO is designed to operate almost maintenance free under most condi tions However some small items of routine maintenance are recommended General To keep the display panel and operator button free from dirt build up regularly wipe over your Tetra CO unit with a damp cloth Filter Inspect the front filter at regular intervals for dirt or damage Replace with a new filter front grill if necessary part number CO1852 Zero and calibration Tetra CO 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 CO also has a zero function in the menu See section 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
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