Van Walt Tetra 3 Quick Start Manual

Van Walt Ltd | Prestwick Lane | Grayswood | Haslemere | Surrey | GU27 2DU | Tel. [phone] | Fax. [phone] | www.vanwalt.com

QUICK START GUIDE: Tetra 3 Personal Gas Monitor

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This guide is meant to serve as a quick reference for operating the Tetra 3 Personal Gas Monitor. It is for your
convenience and is not intended to replace the information found in the Operations Manual provided.

RR164V2_15/02/2016_JO

Operation

1. Ensure unit is in clean air

2. To turn on unit press & hold operator button until red LED ashes.
Unit will activate & proceed through a warm up sequence (45
seconds)

3. Once warm up sequence is complete unit will display an Auto

Zero screen. Press operator button once to conrm auto zero. If
auto zero is not conrmed within 10 seconds unit will proceed to
run mode without performing zero

4. Unit is now in run mode.

In the event of an alarm: refer to Calibration Certicate and
attached sheet for alarm thresholds

In the event of gas concentrations exceeding the alarm thresholds
for any gas being monitored, Tetra 3 will activate audio, visual &
vibrating alarm signals.

When gas levels return to normal you can reset unit back to normal
run mode by pressing the operator button once. Unit will only return
to normal run mode if gas levels are no longer in alarm.

To turn off unit, press & hold operator button for 5 seconds

To Bump Test

1. Unit must be turned on & in normal run mode

2. Clip & fasten ow plate to unit with hoses correctly
connected to inlet & outlets

3. To start bump test, swipe magnet over Crowcon bubble
badge on front of unit. Display will show GAS TEST & a
progress bar

4. Turn on gas regulator while progress bar is
counting down. Progress bar will complete
after approx. 40 seconds & a pass or fail
message will appear.

5. Disconnect ow plate & press operation
button to return to normal run mode.

If Bump Test fails contact Van Walt for assistance.

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Van Walt Ltd | Prestwick Lane | Grayswood | Haslemere | Surrey | GU27 2DU | Tel. [phone] | Fax. [phone] | www.vanwalt.com

QUICK START GUIDE: Tetra 3 Personal Gas Monitor

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Over range sensor shutdown

Tetra 3 uses a catalytic ammable gas sensor, which measures the
ammability of the gas. For this reason, readings displayed on the

unit will be unreliable over concentrations of approximately 120%
LEL. Oxygen in necessary for catalytic sensors to operate. A ‘pellistor
saver’ is used to disconnect power to the pellistor sensor in the event
of over-range to prevent burnout (the alarm will sound and the unit
will lock out). The unit locks out for 200 seconds after which a button
press will restore power to the pellistor. Or the unit can be turned off
in the normal way. Restart should be carried out in a known fresh air
environment. If the unit is restarted in an over range environment,
damage can occur to the pellistor sensor.

Low Oxygen Environment

Depleted oxygen levels can reduce the ammable gas reading. If

oxygen levels are low safe breathable limits it should be assumed that

the ammable reading is low.

Extreme humidity conditions

Extreme humidity conditions can cause unreliable readings. The
sensors are rated for an (average) ambient of 20-90% R.H. However
these units are used from the deserts to the tropics to the tundra
without this normally being a problem.

Water

This unit is dust and water resistant to IP65. Water should not be
allowed to collect on the sensors as this may impede gas diffusion.

How to zero the Tetra 3 LEL Monitor Video

IMPORTANT NOTICE

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