GEM2000 Range Gas Analysers
OMGEMN1.41
Copyright 2009 Geotechnical Instruments (UK) Limited
Page 69
8.6.5 Calibration of H
2
Compensated CO – Mixture CO 100ppm H
2
1000ppm
(GEM2000 PLUS)
Instructions for Use – Mixture CO 100ppm H
2
1000ppm:
The H
2
reading is only for compensation purposes and should not be used to take
measurements.
To calibrate the H
2
compensated CO channel, both the CO and H
2
need to be zeroed and
then spanned separately.
It is probably easiest at this point to set the span values of the different gases that will
be used to calibrate the instrument. The span value is the concentration of the
calibration gas.
START
Main menu
select Field
Calibration
Run the pump
(no pipes)
Clean Air Purge
2 – 3 mins
Stop the pump
Step 2
Zero CO
Zero H
2
Step 5
WAIT
Step 6
Step 7
Attach Regulator
to the Inlet Port
and turn on the
gas
Allow gas to flow
through the unit
for approx. 2 mins
Note: ‘a’ values will
increase
a=Actual readings
b=Target readings
END
Run the pump
(No pipes)
Clean Air Purge
Step 20
Step 21
Step 4
Step 1
Step 8
Go on to the
Zero Channels
process
Go on to the
Zero H
2
process
Remove the gas
source
Stop the pump
Key 3 Target
Concentration set
gas mixture CO 100
ppm H
2
1000ppm
Step 3
Attach Flow
Regulator with
Mixture 100ppm
Step 9
Go on to the
Calibrate CO
process
Step 10
Step 11
Step 12
Span CO @
100ppm
Go on to the
Calibrate H
2
process
Step 13
Step 14
Attach Flow
Regulator with
Mixture H
2
1000ppm
Attach Regulator
to the Inlet Port
and turn on the
gas
Step 15
Step 16
Allow gas to flow
through the unit
for approx. 2 mins
Span H
2
@
1000ppm
Step 17
Step 18
Step 19
Step 22
