Crowcon Tetra Portable Gas Detector User Manual DOWNLOAD
Contents
1. Run mode Your unit is now ready to use a Below is a typical screen display showing the Screen Icons unit in normal gas monitoring Run mode x Warmup CH4 LEL CO ppm Flashing 0 0 0 icon Tetra running 0 0 20 8 normally H2S 02 ppm D Burp Familiarise yourself with the gases being Battery monitored in your unit and make sure you understand site health and safety procedures ex in the event of alarm conditions AUO zerg 2 a Tetra units with an inbuilt pump will produce a low humming noise this is normal Confidence signals In normal Run mode Tetra 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 will activate the alarm signals Alarm signals The red and blue alarm LEDs will flash the sounder Q will emit a loud g h eas 8 fast series of beeps f the internal vibrator en alarm will activate The operator screen JJ will display the gas in alarm and the alarm level See the figure Gas example to the left under alarm Alarm icon 4 gt CROWCON Gas Detection You Can Trust Tetra Switching off 1 When the gas level returns to normal press the operator button This will reset your Tetra unit to normal Run mode If gas levels are still in alarm the button will2. Ensure no restriction to flow Tetra fails gas test Gas cylinder empty Gas cylinder out of date Hose blocked or kinked Calibration drifted Gas flow not started imme diately Check gauge replace cylinder as needed Check date and replace as needed Ensure no restriction to flow Calibrate Tetra Repeat test starting gas immediately Tetra fails calibration Gas cylinder empty Gas cylinder out of date Hose blocked or kinked Calibration drifted Stabilisation time too short Check gauge replace bottle as needed Check date and replace as needed Ensure no restriction to flow Calibrate Tetra Reset using PC software Tetra passes gas test but will not enter calibration mode Menu Zero not performed Tetra not field calibration version Select Zero from menu Send for re configuration Note Remove regulator from gas cylinder when not in use over a prolonged period For parts list see section XI 20 gt CROWCON Gas Detection You Can Trust Tetra Maintenance and Calibration VII Maintenance and Calibration Tetra 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 regularly wipe over your Tetra unit with a damp cloth Filter Inspect the front filter at regular intervals for dirt or damage Replace with a
3. communications link with Portables PC software See section VIII It can record data each minute for 50 hours up to a limit of 1500 events Tetra 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 Pellistor saver on and off 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 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 Ensure you are in a safe area 2 Plug the charger power supply into a mains socket 3 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 scr
4. 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 and the outlet tubing is not restrict ed in any way nor additional tubing length used The Gas Test Accessory Kit is supplied in a convenient carry case and comprises a gas cylinder containing the quad gas mix a Trigger regulator with intercon nect tubing a magnet used to activate Test mode an aspirator plate to attach to the Tetra 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 There are two versions of the kit one for pumped Tetra units and one for non pumped Tetra units supplied with an aspirator plate Pumped Tetra units require the use of the plate with the integral bellows assembly 6 2 How to perform a gas test 1 Ensure your Tetra 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 past the display adjacent to the LED lens Your Tetra unit will activate the Gas Test and show GAS TEST on the display 4 Tetra will display a progress bar at the bottom the names of the gas 18 gt CRO
5. 29 Appendix Limitations of sensors Tetra Appendix Limitations of sensors Sensor limitations The sensors used in Tetra 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 uses a catalytic flammable gas sensor which measures the flammability 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 pellistor saver is used to disconnect power to the pel listor 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 pellistor 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 pellistor sensor Restart should be carried out in a known fresh air environment Depleted oxygen levels can reduce the flammable gas reading and if oxygen levels are below safe breath ing limits it should be assumed that the flammable reading is low 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 norm
6. 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 o 2 gt CROWCON Gas Detection You Can Trust Tetra Quickstart guide Tetra warm up sequence a The unit will test the LEDs Alarm test A Sounder Alarm test alarm LEDs sounder vibration alerts and ZA the operator display screen The sounder may be silenced by pieces pressing the button gir coms 4 K b The unit will continue through a warm up sequence as shown below this will take approximately 45 seconds CROWCON TODAY IS Tetra Tetra wed 5 vs 1 01 Gas Detection You 14203749 a v NEXT CAL AUTO ZERO 1 2 m Clickto S 21 Aug 2003 confirm g in 7 secs 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 will proceed directly to Run mode without performing zero Auto zero AUTO ZERO gt AUTO ZERO AUTO ZERO A Clickto j P Q B En Sav cH4 co e ere Vv ns y 02 w No auto zero CH4 LEL CO ppm BP 0 0 0 Q 0 0 20 9 H2S ppm 02 Run mode gt CROWCON 3 Gas Detection You Can Trust In the event of an alarm Tetra
7. new filter front grille if necessary part number CO1852 Zero and calibration Tetra 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 also has a zero function in the menu See section II 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 6 month regular intervals Calibration method Tetra 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 calibration 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 Calibration and Gas Testing require the use of the correct type of flow plate as follows Non pumped units use either the standard flow plate or the clip on calibration flow plate CO11005 Pumped units with software version 1VO7 or lower The pump is gt CROWCON 21 Gas Detection You
8. 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 can be fitted with a wide range of modular plug and play gas sensors Each sensor carries an intelligent processor which contains calibration and sensor information Tetra is battery operated and is available with rechargeable and non recharge able battery options The rechargeable unit 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 confined space personal monitoring system which is lightweight compact easy to use and cost effective Tetra has a single operator button and an intelligent user friendly display with automatic backlight Gas levels are continuously monitored provid ing normal gas readings peak readings and time weighted averages TWA Tetra 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 has been designed from top to bo
9. Can Trust Maintenance and Calibration Tetra always running even in Calibration or Gas Test modes it is essential to use the C01874 bellows style flow plate Pumped units with software version 1V08 or later where the default configuration is that the pump is automatically switched off in Calibration or Gas Test mode Use the clip on calibration flow plate C011005 unless the default configuration has been changed to main tain the pump running for Calibration or Gas Test in which case it is essential to use the C01874 bellows style flow plate Ozone detector calibrations Always calibrate Crowcon ozone detectors with ozone only Fittings For ozone calibrations all fittings and pipework should be stainless steel brass aluminium or PTFE Fittings or pipework in other plastic materials such as Tygon must not be used Gas flow rate It is important that the flow rate is set correctly as otherwise pressure effects may distort calibration values and prevent the gas detector from working cor rectly To calibrate Crowcon portable detectors the flow rate should be set between 0 8 1 0 litres minute 0 03 0 04 cubic feet minute Normal safety precautions for handling ozone should always be observed along with any special instructions that accompany the calibration gas cylinder or generator being used Model specific instructions Below is information about the calibration of specific Crowcon detectors This differs betwee
10. Dummy sensor module Rubber sealing bung for charger socket i module O ring seal Sensor clip retaining ring For calibration gases consult Crowcon 28 gt CROWCON Gas Detection You Can Trust Tetra Troubleshooting guide XII Troubleshooting guide Symptom 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 a 2 gt CROWCON Gas Detection You Can Trust Cause Flat battery The pump is a PC configurable option Function disabled Zero drifted 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 Action 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
11. ONLY CHARGE IN A NON HAZARDOUS AREA CHARGING VOLTAGE Ui 9V max Manufactured by Crowcon Oxon UK CH4 aai EZ CE 1180 x 1126 Baseefa03ATEX0193 Ex ia d IIC T3 Gb IECEx BAS 04 0024 4 F 20 C lt Ta lt 131 F 55 C FOR INTRINSIC SAFETY PRECAUTIONS SEE MANUAL WARNING UNDERSTAND MANUAL BEFORE OPERATING CHANGE BATTERIES ONLY IN A SAFE AREA REFER TO MANUAL FOR BATTERY TYPE Manufactured by Crowcon Oxon UK 2 The equipment may be used in zones 1 and 2 with group IIA IIB and IIC flammable gases tempera ture classes and vapours T1 T2 T3 and T4 with rechargeable battery option and classes T1 T2 and T3 with non rechargeable battery option 3 The equipment is certified for use in ambi ent temperatures in the range 20 C to 55 C 4 F to 131 F The equipment should not be used outside these ranges 4 Compliance with the Essential Health and Safety Requirements has been assured by com pliance with EN50014 1997 Amds 1 amp 2 EN50020 2002 and EN50018 2000 as certi fied by Baseefa Compliance with gas detec tion performance standards EN50054 EN50057 EN61779 1 EN61779 4 EN50104 and EN50270 has been certified by Lloyd s Register 5 Repair of this equipment and gas sensor replace ment shall be carried out by the manufacturer or in accordance with the applicable code of prac tice 6 If the equipment is likely to come into contact with aggressive substances then it is t
12. THORNE amp DERRICK INTERNATIONAL www thorneandderrick com Tetra Personal Multigas Monitor User Manual ee CROWCON Issue 10 Gas Detection You Can Trust Safety information e Read and understand all instructions in the operation section of this manual before use e Do not substitute components as this may impair intrinsic safety and invalidate warranty e Observe all warnings and instructions marked on the unit and within this manual e Observe site health and safety procedures for gases being monitored and evacuation proce dures e Make sure you understand the screen display and alarm warnings e If this product is not working properly read the troubleshooting guide or call Crowcon e Ensure qualified service personnel change sen sors and operating system e Ensure maintenance and calibration are car ried out in accordance with the procedures in the manual Instructions specific for use in hazardous areas The following instructions apply to equipment cov ered by certificate number BASEEFAO3ATEX0193 The following information covers all relevant points list ed in clause 1 0 6 of the EHSR s of the ATEX directive 1 The certification marking is as follows CH4 eal RX 1180 Ea 2G Baseefa03ATEX0193 Ex ia d IIC T4 Gb IECEx BAS 04 0024 4F 20 C lt Ta lt 131F 55 C FOR INTRINSIC SAFETY PRECAUTIONS SEE MANUAL WARNING UNDERSTAND MANUAL BEFORE OPERATING
13. WCON Gas Detection You Can Trust Tetra Field calibration sensors fitted are shown with a cross beside each Operate the Trigger regulator and apply gas to the Tetra whilst the progress bar is counting down As gas flows and the sensors respond the Tetra monitors the response against stored gas values Provided the response reaches a predefined window around each gas value within the test time the cross by each sensor will change to a tick and the unit passes the test If any sensor response fails the test the Tetra will display a message advising the unit be sent for calibration 6 3 How to perform a field calibration test To perform a field calibration test you must first Zero your Tetra unit 15 min utes or less before commencing the gas test instructions 1 Follow steps 1 to 3 given in 6 2 Tetra will display an alternate screen message Calibrate Click to Confirm In 10 seconds 2 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 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 whilst the progress bar is counting down As gas flows the Tetra allows the sensors to respond and t
14. aded 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 2 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 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 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 the connection ribbons Do not pull the sensor housing assembly too far from the PCB board Doing so may damage the cabling or electrical connections Re assembling the Tetra unit 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 grille 2 Switch on your Tetra unit The new sensor will be automatically identified Check the filters and gaskets are all in good condition Replace if any items are faulty Ref
15. ally 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 30 gt CROWCON Gas Detection You Can Trust A HALMA COMPANY THORNE amp TaD DERRICK INTERNATIONAL www thorneandderrick com
16. and aspirator bulb e Optional spare battery pack for non rechargeable units Battery check The Tetra Personal Multigas Monitor has two battery options Li ion recharge able or alkaline non rechargeable batteries Depending on the battery option chosen the Tetra will operate for a minimum of 12 hours and up to 18 hours when fully charged Rechargeable units Tetra uses a Li ion battery pack and should arrive with sufficient charge so that the unit can be used straight out of the box However if this is the first time you have used the Tetra 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 Quickstart guide 1 Getting started Review your Tetra unit Top view Alarm LEDs D IR comms window UO ae Operator button Operator LCD display screen Side view Belt clip lever lt Front plate Switching on your unit Tetra 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
17. are parts Accessory list Crowcon part number Description C01841 Aspirator Plate and Gasket C01846 Aspirator assembly for pumped units C01847 Aspirator assembly non pumped units C01876 Tetra Gas Test Accessory Kit for pumped units C01877 Tetra Gas Test Accessory Kit for non pumped units Refer to Section VII for applicability C01893 Tetra Gas Test Accessory Kit Refer to Section VII for applicability C01874 Calibration Flow Plate for pumped units Refer to Section VII for applicability C01875 Calibration Flow Plate for non pumped units Refer to Section VII for applicability C011005 Calibration Flow Plate Refer to Section VII for applicability C03365 Quad Gas mixture for Gas Test Accessory Kit 34 litre bottle 50 LEL methane 100ppm carbon monoxide 15ppm_ hydrogen sulphide 18 oxygen balance nitrogen Calibration gas contact Crowcon required gases depend on sensor combination Battery charger power supplies 01839 External PSU for Tetra Charger UK 230 V 50 Hz 01866 External PSU for Tetra Charger US 110 V 60 Hz 01841 External PSU for Tetra Charger Euro 230 V 50Hz 01860 230 V in line charger no plug fitted 01861 110 V in line charger no plug fitted i modules 011424 0 100 LEL methane 011436 0 100 LEL propane 011437 0 100 LEL pentane 011439 0 100 LEL butane 011440 0 100 LEL ethylene There are alternative flammable sensors for different applications Contact Crowcon with the in
18. ed for toxic gases 2 4 Display options Tetra 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 When your choice is highlighted double click the operator button ey Peak display 1 Scroll J 2 Select mi 2 k Sge gu P ma The Tetra operator screen will display the peak or TWA icon and the gas readings recorded 10 gt CROWCON Gas Detection You Can Trust Tetra 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 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 incorporates data and event logging which can be accessed using the IR
19. een 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 Battery fully charged Tetra warning message Battery full a Low battery Battery needs 25 A recharging The charging time will be longer if the unit is switched on during Sees 12 gt CROWCON Gas Detection You Can Trust Tetra Batteries example In Run mode the battery icon will display six bars when it is full 4 Remove the lead from the charging socket and replace the protective cover 3 2 Non rechargeable batteries Tetra uses a three AA alkaline battery pack which will give 11 hours operating time The following battery types are suitable for the non rechargeable ver sion Energizer type LR6 MN1500 Gold Peak type 15A LR6 Duracell type MN1500 LR6 Varta type 4006 Alkaline batteries will typically last 11 hours To replace the battery pack ensure you are in a safe non hazardous area The battery pack is located in the bottom of the instrument Remove the access cover and withdraw the battery pack Replace the 3 x AA cells then reinsert the pack into the instrument and replace and securely fasten the access cover gt CROWCON 13 Gas Detection You Can Trust Ala
20. er to the troubleshooting guide if necessary gt CROWCON 25 Gas Detection You Can Trust Specification Tetra 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 approx 20 seconds for most toxic sen sors 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 BASEEFAO3ATEXO193 Approval codes Europe ATEX II 2G EEx ia d IIC T4 Tamb 20 C to 55 C USA Class Division 1 Groups A B C and D Canada Class Division 1 Groups A B C and D T4 Standards Safety EN50014 EN50020 EN50018 94 9 EC USA UL913 Canada CSA22 2 152 Operation EN50270 EN50271 IEC61508 Marine Equipment Directive 96 98 EC Tetra can be supplied Wheelmarked compliant with the Marine Equipment Directive Contact Crowcon to obtain a copy of the MED certificate gt CROWCON Gas Detection You Can Trust Tetra Accessories and spare parts XI Accessories and sp
21. have no effect For any one gas there The Tetra alarm is set to latch by default are 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 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 CH4 m yp T gt 4 sec H2S ppm o2 Storing conditions In order to optimise sensor performance and lifetime your Tetra 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 I Introduction Thank you for purchasing the new Tetra Personal Multigas Monitor Tetra is a portable multigas detector designed to be carried or worn by individuals work ing in hazardous environments such as confined spaces It is suitable for use in Zone 1 and 2 hazardous areas Tetra can monitor up to four different gases and display the readings simultaneously on a display screen Alarm
22. he 15 minute or the 8 hour TWA is triggered Ne Tetra will go into alarm and display the TWA icon with the toxic gas readings The 8 hour TWA alarm cannot be cleared 14 gt CROWCON Gas Detection You Can Trust Tetra Fixing accessories V Fixing Accessories Belt clip Tetra 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 lever Waist connectors How to wear your Tetra unit Chest harness Slide the universal harness plate over the belt clip at the back of your Tetra 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 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 XI for full list gt CROWCON 15 Gas Detection You Can Trust Flow sampling Tetra VI Flow sampling Attaching the flow adaptor plate To perform manual sampling
23. he respon sibility of the user to take suitable precautions that prevent it from being adversely affected thus ensuring that the type of protection is not com promised 7 The rechargeable battery must only be charged in non hazardous safe areas by connection to the specified Crowcon charger power supply 8 Only the following cell types may be fitted in the battery compartment of the non rechargeable battery pack Duracell MN1500 LR6 Varta 4006 Ever Ready Energizer LR6 GP Batteries 15A LR6 1 5V The cells must only be changed in a non haz ardous safe area 9 The equipment is not certified for use in atmos pheres containing more than 21 oxygen Area Classifications Zone 1 An area classified as Zone 1 is likely to have ignitable concentrations of flammable gases vapours or liquids present under normal oper ating conditions Zone 2 An area classified as Zone 2 is not likely to have ignitable concentrations of flammable gases vapours or liquids present under nor mal operating conditions THORNE amp DERRICK INTERNATIONAL www thorneandderrick com Copyright Crowcon Detection Instruments Ltd 2010 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 M07237 Tenth edition May 2010 Tetra Personal Multigas Monitor Contents WIRE CHING e
24. hen adjust the value for each gas channel to match the stored calibration gas 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 19 Gas Detection You Can Trust Gas test calibration troubleshooting Tetra 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 i modules are usually not set to calibrate enabled as the calibration at 20 9 on atmospheric air during the zero process is more accurate and repeat able than using certified gas mixtures Provided it completes a successful test and the other i modules fitted successfully calibrate the calibration due date for oxygen will be reset during a Cal Test 6 5 Gas test calibration troubleshooting Symptom No response to gas Possible Cause Gas cylinder empty Action Check gauge replace cylinder Hose blocked or kinked as needed
25. ile gt CROWCON 23 Gas Detection You Can Trust i module replacement Tetra 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 front cover grille by unscrewing the M3 2 mm Allen screw as shown the in the drawing point 4 Unscrew the side retaining M4 3 mm Allen screws as shown in 5 Remove the three sensor plate retaining screws as shown by point 6 Ease the top away from the body point 7 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 Locate the i module connection ribbon squeeze the two retaining lugs on the module board toward each other and pull out slightly this will release the ribbon 2 Remove the retaining ring from the clips Unclip the i module from the 24 gt CROWCON Gas Detection You Can Trust Tetra i module replacement on aa az two quick release fixings push the sensor mounting out of 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 lo
26. n models due to the different interactions of sensors and gas flows in each type For calibrating the ozone the flow plate with four inlets part number S012976 should be used The ozone sensor should always be at position 3 as marked on the aspirator plate Note that the standard flow plate must be used for calibrat ing the other gas sensors 22 gt CROWCON Gas Detection You Can Trust Tetra PC interface and software Vill PC interface and software Tetra can be connected to a PC using an infrared optical link The Tetra 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 opera tion run calibrations print reports and to access 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 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 and upload the configuration For more information on using the Crowcon Portables PC software see installed help f
27. nction ensuring reliability and service for years to come Software The internal software in Tetra has been designed and written in accordance with the requirement of IEC 61508 to ensure quality and integrity of operation Tetra 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 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 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 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 da
28. neeier Quickstart guide sas cacnis tiivenacsnanerodverenaysh l INtrodUCtION is lt chdcenckeseateartaseseresavswresiies l Operati oN oxkipchineiindschbebabretnanerninneusss s Il TBO OS i tacteacecicncatcncareingiesedauuasendienteoul IV Alarm indications n V FIRING ACCESSOriesS 1c2ciccscsaccdssasttaateariaeests VI Flow sampling vcccisecizaviceeeretavra VII Maintenance and calibration VIII PC interface and software IX i module replacement Xe SEC NICATION iar cavacacaneerencscnsbanasmenicneanatten XI Accessories and spare parts XII Troubleshooting guide 0 Appendix Limitations of sensors Tetra Unpacking Tetra Personal Multigas Monitor Thank you for purchasing the new Tetra Personal Multigas Monitor Tetra has redefined portable gas monitoring and will give you years of unparalleled serv ice and reliability Please read the instructions carefully before use Keep the manual for future reference Unpacking Remove the Tetra Personal Multigas Monitor from the packaging The Tetra accessories will be located in the bottom of the box Check the contents are complete you should have e Tetra 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
29. nel will display the gas name units and current value Familiarise yourself with the gases currently being Tg Auto zero tam o monitored in your unit Ensure you understand site health and safety proce dures For information on peak and TWA readings go to section 2 4 Confidence signals To reassure users the unit is working correctly the Tetra 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 THERA Sj Battery 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 will emit warning bleeps If the battery becomes too low Tetra will display a Battery low warning message and switch off Internal pump This revolving icon indicates the internal pump is running If the pump or airway becomes blocked the unit will emit a warning sound and display a warning message Check the 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 Cai n Trust Display options Tetra a TWA alarm P Tetra will display the TWA alarm when the 15 minute or 8 hour time weighted average alarm threshold is pass
30. rm indications Tetra IV Alarm indications Tetra provides two instantaneous alarm levels for each installed sensor des ignated level 1 and level 2 For toxic gas sensors there are also two time weighted 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 and level 2 alarms can be set for each individual gas sensor Alarm thresholds for each sensor Level 1 a a Alarm type This can be set to rising levels of gas concen tration or as falling Oxygen sensors 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 In the event t
31. rt water or a kink in the line the pump will automatically stop Tetra will emit a rapid series of beeps and display a warning message To restart the pump clear the blockage and press the operator button J 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 gt CROWCON 17 Gas Detection You Can Trust Gas testing Tetra Tetra gas test accessory kit The Gas Test Accessory is a gas testing kit designed to enable gas testing of the Tetra multigas detector using a specially formulated high stability long life quad gas mix It can be used with Tetra units having sensors for Flammable Oxygen Carbon Monoxide and Hydrogen Sulphide gases and all Tetra units with these sensors can be gas tested using the kit 6 1 Gas testing Gas 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 is issued for use The Tetra itself will determine Pass Fail status for the gas test In order to perform successful gas tests ensure e The quad gas mixture used has the correct gas concentration and that
32. strument Serial No to check correct sensor type i modules cont S011423 0 25 oxygen O S011421 0 100 ppm hydrogen sulphide H3S gt CROWCON 27 Gas Detection You Can Trust Accessories and spare parts Tetra S011422 S011425 S011426 S011427 S011428 S011429 S011430 S011431 S011432 S011433 S011434 S011435 S011438 0 500 ppm carbon monoxide CO 0 20 ppm sulphur dioxide SO 0 10 ppm nitrogen dioxide NO3 0 20 ppm nitrogen dioxide NO3 0 20 ppm chlorine Cl 0 1000 ppm hydrogen H3 0 25 ppm hydrogen cyanide HCN 0 5 ppm phosphine PH3 0 1 ppm ozone O3 0 10 ppm hydrogen fluoride HF 0 1 ppm fluorine 0 100 ppm ammonia NH3 0 1000 ppm ammonia Sampling accessories C01847 C01757 C01097 M04032 C03141 C01245 Aspirator assembly for non pumped units Telescopic aspirator probe 3 foot Sample probe Aspirator hose please specify length in feet 6 m Drop line Water trap Carrying and wearing C01842 C01843 C01844 C01845 C01888 Communications MIS26003 C02097 C01832 Universal harness plate Shoulder strap Chest harness strap kit Carry case rechargeable units Carry case non rechargeable units Infrared adaptor for PC plugs into RS232 port USB to RS232 adaptor Portables PC Software CD Spares consumables 01541 S011330 C01851 S011398 C01853 M04787 M04482 M04431 Alkaline battery AA 3 required Rechargeable Li ion battery pack assembly Aspirator bulb Sensor filter assembly
33. te has expired or has passed the Tetra 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 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 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 that has failed Switch off To switch off the unit press and hold the operator button for 5 seconds A shut down message OFF IN will appear continue to hold button until the unit counts down to shut off gt CROWCON Gas Detection You Can Trust Tetra Run mode 2 2 Run mode The Tetra unit will display up to four gas readings simul Screen Icons taneously on the operator display screen A typical display se Warm up with four sensors installed is shown below Flashing 2 x D icon Tetra CH4 LELICO ppm p running 0 0 0 D normally 0 0 20 8 D Pump H2S ppm loz E Battery Each chan
34. ttom to bring you a revolution in ease of use maintenance and extreme reliability Through innovative and rigorous design technology we have introduced several new features i module gas sensor Tetra uses unique plug and play i module sensor technology Each sensor unit incorporates its own intelligent processor holding sensor configuration and calibration data Different sensors can be purchased and once inserted are immediately ready to run Tetra can operate with up to four sensors and dis play simultaneously information and gas readings for all the sensors on one screen This means no redundancy and assured future investment in your Tetra 6 gt CROWCON Gas Detection You Can Trust Tetra Introduction unit allowing you to swap sensors between units or configure your unit as 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 i modules can be purchased pre calibrated from your local supplier Reliable anti shock mechanics and robust housing The Tetra 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 fu
35. 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 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 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 16 gt CROWCON Gas Detection You Can Trust Tetra Flow sampling 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 di
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