Crowcon TETRA 4 User manual

8. SWITCHING OFF UNIT
• Press and hold the operator 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 4 should be stored in a clean, dry area,
non-hazardous area, 0-30°C, 10-95%RH, in the
storage box provided by MGF.
10. DISCLAIMER
•Failure to adhere to the instructions supplied with
the equipment may invalidate any claims with
respect to damage, death or injury due to the misuse
or malfunctioning of the apparatus.
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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
PLEASE READ & UNDERSTAND THIS USER GUIDE
PRIOR TO COMPILING A SAFE SYSTEM OF WORK
AND USING THE EQUIPMENT SUPPLIED
For the latest version of this document visit mgf.co.uk
USER GUIDE: CROWCON TETRA
4 GAS DETECTOR
MULTIGAS MONITORING SYSTEM
E: [e-mail] |W: mgf.ltd.uk
HEAD OFFICE
GRANT HOUSE
LOCKETT ROAD
ASHTON IN
MAKERFIELD
WIGAN
WN4 8DE
ENGINEERING
CENTRE
FOUNDATION HOUSE
WALLWORK ROAD
ASTLEY
MANCHESTER
M29 7JT
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[e-mail]
0808 163 7672
NORTH EAST  DURHAM
DEPOT
Thistle Road, Littleburn Ind.
Est., Langley Moor, County
Durham, DH7 8HJ
T: 01913 782100
YORKSHIRE 
CASTLEFORD DEPOT
Allerton Bywater Business
Park, Newton Lane
Castleford, WF10 2AL
T: 01977 521930
NORTH WEST 
ASTLEY DEPOT
Wallwork Road
Astley
Manchester
M29 7JT
T: 01942 896282
EAST ANGLIA 
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Unit 5, O’Brien Ind.
Est., Grove Lane
Stanton, Bury St.
Edmunds, Suffolk
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Ray Lamb Way
Manor Road
Erith, Kent, DA8 2LB
T: 01322 344520
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DEPOT
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DEPOT
Unit 58, Greendale Business
Park, Woodbury Salterton
Exeter, EX5 1EW
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BRISTOL DEPOT
Severn Road
Chittening
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Bristol, BS11 0YL
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RUGELEY DEPOT
Redbrook Lane
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WEST LOTHIAN 
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Letham Road, Houstoun Ind.
Est. Livingston, West Lothian
EH54 5BY
T: 01506 535556

3) If the T4 is switched on within 8 hours of being
switched off, the following screen will be displayed
for 10 seconds allowing the T4 to retain TWA, STEL
and peak readings, simply press the operator button
to retain, or allow the count to expire.
4) The screen will cycle through displaying the
serial number, firmware version, configured user
name, sensor lower and upper alarm levels, next
calibration and bump test due dates, the date and
time and autozero screen.
5) The screen will then revert to the normal operation
home screen, as shown below.
7. IN THE EVENT OF AN ALARM
• In the event of gas concentrations exceeding the
alarm thresholds for any gas being monitored, the
T4 will activate the alarm signals.
• Alarm signals – The red and blue alarm LEDs will
flash, the sounder will emit a tone, 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 T4 unit to
normal run mode. If gas levels are still in alarm, the
button will have no effect.
• The T4 will also indicate if the battery has less
than 30 minutes of life remaining, the sounder will
emit a double blip every 5 seconds and the display
will flash the battery empty icon. When the alarm
sounds the user should move to a safe area before
the 30 minutes expires.
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 4 GAS DETECTOR
• The Tetra 4 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.
Specifications
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GASES AND RANGES
Gas Range Resolution
Flammable (Methane) 0-100% LEL 1% LEL
Oxygen (O) 0-30% vol. 0.1% vol.
Hydrogen suplhide (HS) 0-100ppm 1ppm
Carbon
monoxide (CO)
1-1000ppm 1ppm
• 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.
6. USING THE CROWCON TETRA 4 GAS DETECTOR
• Switching on your unit
1) Ensure the unit is in clean air.
2) Switch on – Hold down the operator button for 3
audible blips followed by one longer tone.
Size 135 x 80 x 35mm (5.3 x 3.1 x 1.4ins)
Weight 282g (9.9oz)
Alarms Audible: 95dB
Vibrating
Visible: Bright red & blue LED’s
Display Front mounted
Backlit
180° flip for easy viewing while working
Data Logging 130 hours of data at 10 second intervals
Event Logging Approx. 3500 events
Battery Rechargeable Li-ion battery
Up to 18 hours runtime
5.5 hour recharge
Operating
Temperature
-20°C to +55°C (-4°F to + 131°F)
Humidity 10-95% RH @40°C non-condensing
Ingress
Protection
Independently tested to IP65 and IP67
Compliance EMC Directive 2014/30/EU
CE, FCC and ICES-003
Figure 1
Figure 2
Figure 3