OMGEMN1.41
GEM2000 Range Gas Analysers
Page 70
Copyright 2009 Geotechnical Instruments (UK) Limited
Step 1
From the ‘Main Gas Read Screen’ select ‘Menu’.
Select ‘Key 1’ from the menu and use ‘Key 8 - Scroll Down’ to select
‘Field Calibration’.
From the ‘Check Calibration’ screen select ‘Key 3’ to edit target
concentrations.
Scroll and press the ‘Enter’ key to select required gas channel.
Enter the appropriate value for the highlighted channel then press the
‘Enter’ key.
Step 2
From the ‘Check Calibration’ screen:
Press
to edit target concentrations.
Scroll using
and press
to select the required gas channel.
Enter the appropriate value for the highlighted channel then press
.
When using CO gas mixture, set CO to 100ppm and H
2
to 1000ppm.
Press
Step 3
Go on to the Zero Channels Process
For this zeroing operation none of the calibration equipment is required.
Remove gas source if attached.
Ensure this operation is performed in clean fresh air.
Step 4
Press
and allow the pump to run for approximately two minutes or
until reading stabilises; this purges the unit of gas.
Step 5
Press
to switch off the pump.
Step 6
From the ‘Check Calibration’ screen:
Press
to select ‘Calibration Menu’.
Scroll
to ‘Zero CO’.
Press
to select ‘Zero CO’.
‘USER ZERO COMPLETE’ should be displayed.
Step 7
Go on to the Zero H
2
Process
For this zeroing operation none of the calibration equipment is required.
Remove gas source if attached.
Ensure this operation is performed in clean fresh air.
Step 8
Press
to select ‘Calibration Menu’.
Press
to select ‘Zero Channel(s)’.
Scroll
to ‘Zero H
2
’.
Press
to select ‘Zero H
2
’.
‘USER ZERO COMPLETE should be displayed.
