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Tetra 3 Run mode
2.2 Run mode
The Tetra 3 unit will display up to four gas readings simul-
taneously on the operator display screen. A typical four
gas display is shown below.
Each channel will display the gas name, units and current
value. Familiarise yourself with the gases currently being
monitored in your unit. Ensure you understand site health
and safety procedures. For information on peak and TWA
readings, go to section 2.4.
2.3 Display symbol guide
Battery
A full battery is represented by a battery icon showing a full
six bars. A low battery charge will show 1 to 2 bars. When
zero bars are shown the battery icon flashes. The sounder
will emit warning bleeps.
If the battery becomes too low, Tetra 3 will display a ‘Battery
low’ warning message and switch off.
TWA alarm
Tetra 3 will display the TWA alarm when the 15 minute or 8
hour time weighted average alarm threshold is passed for
toxic gases.
Confidence signals
To reassure users the unit is working correctly, the Tetra 3 unit will
emit a short beep every 10 seconds and the OK icon will flash.
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