GMI PPM Gasurveyor 500, User Handbook Manual

Page: 26 / 90

PPM GASURVEYOR 500 USER HANDBOOK
16
Switching Off
A double press of Button One turns the instrument
off immediately.
The instrument switches off automatically after 30
minutes. ‘OFF’ is shown in the top right hand corner of
the display. Pressing any button cancels this automatic
switch-off. The instrument will then allow another 30
minutes of use.
This 30 minute period is set as a default.
The switch off time may be altered to any time between 1
and 1000 minutes
Changing Range
Each single press of Button Two changes the range
selected. The display cycles through the available ranges
in the order LEL/GAS – PPM – LEL/GAS, etc.
Note: The instrument, by default, auto-ranges between
LEL and Volume Gas.
Activate the Audible Geiger Indication (PPM or
Search Range)
The audible Geiger indication can be activated by pressing
and holding Button Two .
A further press and hold of Button Two will increase
the audible level.
A further press and hold of Button Two will return to
visual only Geiger indication.