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Related Manuals for Crowcon Tetra MO7237
Summary of Contents for Crowcon Tetra MO7237
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Page 1: User Manual
Tetra Personal Multigas Monitor User Manual M07237 May 2010 Issue 10... -
Page 2: Safety Information
T1, T2, T3 and T4 with photocopied, reproduced, or translated to another language rechargeable battery option and classes T1, T2 without the prior written consent of Crowcon Detection and T3 with non-rechargeable battery option. Instruments Ltd. -
Page 3: Table Of Contents
Tetra Personal Multigas Monitor Contents Unpacking ..........1 Quickstart guide ........2 I. Introduction ..........6 II. Operation ..........8 III. Batteries ..........12 IV. Alarm indications ........14 V. Fixing accessories .........15 VI. Flow sampling ........16 VII. Maintenance and calibration ....21 VIII. PC interface and software ....23 IX. -
Page 5: Personal Multigas Monitor
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. -
Page 6: Quickstart Guide
Quickstart guide Tetra Quickstart guide 1. Getting started Review your Tetra unit Top view Alarm LEDs IR comms window Operator button Operator LCD display screen Side view Belt clip lever Front plate Switching on your unit Tetra requires little setting up, follow these simple steps to get your unit ready for use. -
Page 7: Run Mode
Vibrator Alarm test pressing the button. b) The unit will continue through a warm up sequence as shown below, this will take approximately 45 seconds. TODAY IS CROWCON Tetra Tetra 14-May-2003 vs. 1.01 Gas Detection You .. - Page 8 In the event of an alarm Tetra Run mode Your unit is now ready to use. Below is a typical screen display showing the Screen Icons unit in normal gas monitoring Run mode. Warm up %LEL CO Flashing icon, Tetra running normally 20.8 Pump Familiarise yourself with the gases being Battery monitored in your unit and make sure you understand site health and safety procedures...
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Page 9: Additional Information
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 will 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,... -
Page 10: Introduction
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. - Page 11 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.
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Page 12: Operation
Operation Tetra II. Operation 2.1 Switch-on sequence 1. Ensure the unit is in clean air. 2. 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. - Page 13 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 Warm up with four sensors installed, is shown below. Flashing icon, Tetra %LEL CO running normally 20.8...
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Page 14: Display Options
Display options Tetra TWA alarm Tetra 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 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. - Page 15 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.
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Page 16: Batteries
Batteries Tetra III. 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. - Page 17 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.
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Page 18: Alarm Indications
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:... -
Page 19: Fixing Accessories
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... -
Page 20: Flow Sampling
Flow sampling Tetra 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 Gas out 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. - Page 21 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...
- Page 22 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.
- Page 23 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.
- Page 24 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.
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Page 25: Maintenance 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. - Page 26 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).
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Page 27: Pc Interface And Software
, part number infrared PC interface 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. -
Page 28: I-Module Replacement
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 ... - Page 29 Tetra i-module replacement 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 loaded. 1. Unwrap the i-module from any packaging, ensure the sensor is fully seated on the module board.
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Page 30: Specification
Standards Safety: EN50014, EN50020, EN50018, 94/9/EC USA: UL913 Canada: CSA22.2, 152 Operation EN50270, EN50271, IEC61508 Marine Equipment Directive Tetra can be supplied Wheelmarked compliant 96/98/EC with the Marine Equipment Directive. Contact Crowcon to obtain a copy of the MED certificate... -
Page 31: Accessories And Spare Parts
S011437* 0-100% LEL pentane S011439* 0-100% LEL butane S011440* 0-100% LEL ethylene *There are alternative flammable sensors for different applications. Contact Crowcon with the instrument Serial No. to check correct sensor type. i-modules cont: S011423 0-25% oxygen O S011421 0-100 ppm hydrogen sulphide H... - Page 32 Alkaline battery, AA (3 required) 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...
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Page 33: Troubleshooting Guide
Tetra Troubleshooting guide XII. Troubleshooting guide Symptom/ Cause Action error message Instrument won't switch on Flat battery. Recharge or replace battery. Pump not running The pump is a PC Reconfigure with PC configurable option. software. No confidence beep Function disabled. Reconfigure with PC software. Gas reading when no gas Zero drifted. -
Page 34: 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. - Page 36 UK Office USA Office Crowcon Detection Instruments Ltd Crowcon Detection Instruments Ltd 2 Blacklands Way, 21 Kenton Lands Road Abingdon Business Park Erlanger Abingdon Kentucky 41018-1845 Oxfordshire OX14 1DY United Kingdom Tel: +1 859 957 1039 or Tel: +44 (0)1235 557700...
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