Heath-consultants GT Series Manuel d'utilisateur Page 88

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8-4
USER HANDBOOK
8.5 DESCRIPTION OF PURGE BUTTON
OPERATION
8.5.1 Lights
To switch ON the backlight:
Press and hold the Centre button
To switch ON the flashlight:
Press and hold the Centre button again.
The backlight and flashlight are both timed to switch OFF
after two minutes. Both can be switched OFF by a third
press and hold the Centre button
8.5.2 Pump
To switch the pump ON and OFF:
Press the RH button
.
8.5.3 Manual Zero
To zero the reading (in fresh air):
Press and hold ZERO .
Note: Pump must be switched ON to zero reading.
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