Heath Consultants GT Series - Manual (Page 24)

3-2
USER HANDBOOK
Each time you use the instrument, carry out the following
procedure:
3.1 SWITCH THE INSTRUMENT ON
To switch the instrument ON in fresh air:
• Press and hold the RH button , for one second.
Fig. 3.1 Switch ON
The instrument begins its warm-up routine, which lasts
approximately 30 seconds. During the warm-up cycle, a
countdown timer appears in the top right hand corner of
the display.
The Power ON LED illuminates when the instrument is
switched ON and also during operation. The display
backlight illuminates and remains ON during warm-up.
When the warm-up cycle is complete, the screen light
automatically switches OFF.
The Fault LED illuminates briefly, for approximately five
(5) seconds, during the warm-up cycle.