GEM2000 Range Gas Analysers
OMGEMN1.41
Copyright 2009 Geotechnical Instruments (UK) Limited
Page 63
8.6.3 High Level Calibration - Mixture 3
START
Main menu
select Field
Calibration
Key 3 Target
Concentration set
gas mixtures CH
4
60%, CO
2
40%, O
2
20.8%
Run the pump
(no pipes)
Clean Air Purge
2 – 3 mins
Stop the pump
Step 2
Zero All Channels
Attach Flow
Regulator with
Mixture 3
Step 5
WAIT
Step 6
Step 7
Attach Regulator
to the Inlet Port
Allow gas to flow
through the unit
for approx. 2 mins
Note: ‘a’ values will
increase
a=Actual readings
b=Target readings
Step 10
Zero O
2
Channel
END
Span CH
4
Channel
@ 60%
Remove the gas
source
Run the pump
(no pipes)
Stop the pump
Step 17
Step 18
Step 13
Step 14
Step 4
Step 12
Step 19
Step 16
Step 9
Step 1
Step 11
Step 15
Step 8
Step 3
Span CO
2
Channel @ 40%
Wait for the
readings to
stabilise
Span O
2
Channel
@ 20.8%
Step 20
Step 21
Go on to the
Zero All
process
Go on to the
Zero O
2
process with
Mixture 3
Go on to
Calibrate CH
4
process with
Mixture 3@60%
Go on to
Calibrate CO
2
process with
Mixture 3@40%
Go on to
Calibrate O
2
with Air process
@20.8%
Mixture 3 - CH
4
60% CO
2
40% O
2
0%
(Air CH
4
0%, O
2
20.8%)
Step 22
