GMI PPM Gasurveyor 500, User Handbook Manual

Page: 55 / 90

B-3
Selectable Ranges in FCM
When in FCM the following ranges are manually
selectable by pressing Button Two : PPM, LEL,
Volume GAS, Search.
Note: There is no requirement to calibrate Search range
since this is derived from PPM.
Entering FCM
1) Switch the instrument on and allow it to complete
its warm-up checks.
2) Double press Button One to initiate instrument
switch off. While OFF is displayed in the LCD
and before the instrument actually switches off,
enter the access code.
Note: Allow at least one second between button presses
when entering the button sequence. The default
(factory set) entry code is button sequence 1,2,1,2.
Alternative codes are user selectable.
When the instrument is in FCM, the “CAL” message
alternates on the display with the currently selected range.
An example of the display is shown in Figure B-3.
Figure B-3 Field Calibration Display
FIELD CALIBRATION