6) Run mode – Your unit is now ready to use. Familiarise yourself with the gases being monitored in your unit and make sure you understand the health and safety procedures in the event of alarm conditions. In run mode the T3 will emit a short beep every 10 seconds and the OK icon flashes to show operational health.

7. IN THE EVENT OF AN ALARM• In the event of gas concentrations exceeding the alarm

thresholds for any gas being monitored, the T3 will activate the alarm signals.

• 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 alarm level.

• When the gas level returns to normal, press the operator button. This will reset your T3 unit to normal run mode. If gas levels are still in alarm, the button will have no effect.

8. SWITCHING OF UNIT• Press and hold the button for 5 seconds. The shutdown

menu appears, continue to hold button until the unit counts down to shut off.

9. STORAGE AND CARE• The Tetra 3 should be stored in a clean, dry area, non-

hazardous area, 0-30°C, 10-90%RH, in the storage box provided by MGF.

10. DISCLAMER• Failure to adhere to the instructions supplied with

the equipment may invalidate any claims with respect

PLEASE READ & UNDERSTAND THIS USER GUIDEPRIOR TO COMPILING A SAFE SYSTEM OF WORK

AND USING THE EQUIPMENT SUPPLIED

USER GUIDE: CROWCON TETRA 3 GAS DETECTOR

MULTI-GAS MONITORING SYSTEM

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WARNINGS• WARNING – Do not try to modify or change the

equipment in any way as this could void any warranty or cause damage to this equipment or persons using it.

For the latest version of this document visit www.mgf.ltd.uk

Supporting our customersto createsafe working environments

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Approved Supplier and Servicing Agent

6. USING THE CROWCON TETRA 3 GAS DETECTOR

Switching on your unit1) Ensure the unit is in clean air.2) Switch on – Press and hold the operator button until the

red LED flashes. The operator display will light up and the unit will begin a warm up sequence.

3) The unit will test the alarm LEDs, sounder, vibration alerts, and the operator display screen. The sounder may be silenced by pressing the button.

4) The unit will continue through a warm up sequence as shown below, this will take approximately 45 seconds.

5) 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 3 will proceed directly to Run mode without performing zero.

1. IMPORTANT NOTES• For the use of MGF supplied equipment only.• Ensure users are fully trained in the operation of this

equipment and a site specific safe system of works is in place and adhered to.

• It is essential that site specific risk assessments are undertaken.

• Do not try to modify or change the equipment in any way as this could void any warranty or cause damage to equipment or persons using it.

• If in doubt concerning the integrity of any part of the equipment DO NOT USE IT

2. CROWCON TETRA 3 GAS DETECTOR• The Tetra:3 multi-gas monitor is a compact, robust and

easy-to-use diffusion based detector. Single button operation, small size and clear top-mounted display make it a favourite in the market amongst those working in demanding industrial environments; such as those in the water, telecoms, food, brewing or hydrocarbons sectors.

3. GASES AND RANGES

• While these are the standard gases we use, we have the ability to provide detection for other gases, please speak to the MGF Safety Department for further details.

4. MGF EXAMINATION AND TESTING• Upon return to MGF the equipment will be cleaned,

inspected and function tested by a competent and trained MGF safety technician.

5. VISUAL INSPECTION/FUNCTIONAL TEST - PRIOR TO USE

• Before the start of each use ensure that the equipment is clean and free from debris and there are no obvious defects.

• Ensure that the item has a green tag, stating when it was last inspected.

• Each item comes with a unique ID number, please ensure this can be found.

Size 114 x 71 x 48mm (tapers to 20mm) (4.5 x 2.8 x 1.9ins)

Weight 295g (10.4oz)

Alarms 95dB multiple alarm sounds allow selection of distinctive tones for different alarm levels. Internal vibrating alarm

Display Graphic LCD with backlight, giving simulta-neous display for all gas channels. Graphic symbols for battery (with proportional indication of remaining operation time), healthy operation or fault warning. Start-up indication when calibration is due, over-due, or service required. Normal display: Real time gas concentration levels. Display recall: Peak readings and TWA

Data Logging Timed: 50 hours at 1-minute data rate (>12,000 data logs of 4 channels) Threshold: Starts after adjustable pre-set levelEvent: >5,000 events

Event Logging Alarm, over range, calibration, bump, on/off, TWA, 1000 events

Battery Rechargeable Li-ion battery

Operating Time

Based on four-gas instrument fitted with flammable sensor: A 5-hour charge from flat provides at least 12 hours of continuous use. A 12-hour charge provides at least 14 hours of continuous use

Sampling Diffusion or hand aspirator

Operating Temperature

-20°C to +55°C (-4°F to +131°F)

Storage -25°C to +65°C (-13°F to +149°F)

Humidity 20 to 90% RH@ 40°C non-condensing

Ingress Protection

IP65 and IP67

Approvals ATEX II 2 G Ex ia d IIC T4 Gb (-20°C ≤ Ta ≤ +55°C) BASEEFA05ATEX0187IECEx Ex ia d IIC T4 Gb (-20°C ≤ Ta ≤ +55°C) BAS05.0059CSA Class I Division 1 Groups A, B, C and D

Safety Standards

EN60079-0, EN60079-11, EN60079-1, CSA22.2, 152, EN50270, EN50271, EN50104, EN45544, EN60079, IEC61508

Specifications

Gas Range Typical AlarmsFlammable (Methane)

0-100% LEL 20%

Oxygen (O²) 0-25% 19/23.5%

Hydrogen Sulphide (H²S)

0-100ppm 5ppm

Carbon Monoxide (CO) 1-500ppm 30ppm

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