MGF CROWCON TETRA 3 User manual
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 GUIDE
PRIOR TO COMPILING A SAFE SYSTEM OF WORK
AND USING THE EQUIPMENT SUPPLIED
USER GUIDE: CROWCON TETRA
3 GAS DETECTOR
MULTIGAS MONITORING SYSTEM
mgf.ltd.uk
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 customers
to create
safe working
environments
Head Office
T: 01942 402 700
Engineering Centre
T: 01942 402 704
North East
T: 01913 782 100
Yorkshire
T: 01977 521 930
North West
T: 01942 896 282
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T: 01889 574 777
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T: 01296 663 250
London City
T: 01322 344 520
Bristol
T: 01179 820 706
Exeter
T: 01395 233 194
E: safety@mgf.ltd.uk |W: mgf.ltd.uk
Approved Supplier
and Servicing Agent
6. USING THE CROWCON TETRA 3 GAS
DETECTOR
Switching on your unit
1) Ensure the unit is in clean air.
2) Switch on – Press and hold the operator button until the
red LED flashes. The operator display 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 level
Event: >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) BASEEFA05ATEX0187
IECEx Ex ia d IIC T4 Gb (-20°C ≤ Ta ≤ +55°C)
BAS05.0059
CSA 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 Alarms
Flammable
(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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