Heath Consultants GT Series - Manual (Page 63)

5-9
CONFINED SPACE MODE
5.9 CSM CONFIDENCE SIGNAL
During normal operation, the instrument sounds a
confidence beep and illuminates the bottom pair of red
LED's briefly every 15 seconds. This function is
programmable in the instrument setup software.
The confidence signal function makes the user aware
that the instrument is operating correctly:
Note: The confidence beep and / or LED indication can be
disabled. Refer to the 'SET-UP SOFTWARE USER
HANDBOOK' for further information.