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Tetra Run mode
2.2 Run mode
The Tetra unit will display up to four gas readings simul-
taneously on the operator display screen. A typical display
with four sensors installed, is shown below.
Each channel will display the gas name, units and current
value. Familiarize 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 will display a ‘Battery
low’ warning message and switch off.
Internal pump
This revolving icon indicates the internal pump is running. If
the pump or airway becomes blocked, the unit will emit a
warning sound and display a warning message. Check the
flow adaptor and sample lines are free from dirt or water,
and that the sample line is not kinked or blocked. Restart
pump by pressing the operator button.
Confidence signals
To reassure users the unit is working correctly, the Tetra unit
will emit a short beep every 10 seconds and the OK icon will
flash. The pump is running correctly when the icon is
revolving.
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