GEM2000 Range Gas Analysers
OMGEMN1.41
Copyright 2009 Geotechnical Instruments (UK) Limited
Page 55
8.6.1 Low Level Calibration - Mixture 1
START
Run the pump
(no pipes)
Clean Air Purge
2 – 3 mins
Stop the pump
Zero All Channels
Attach Flow
Regulator with
Mixture 1
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
change
a=Actual readings
b=Target readings
Step 10
END
Span CH
4
Channel @ 5%
Step 9
Step 13
Step 8
Span CO
2
Channel @5%
Span O
2
Channel
@6%
Main menu select
Field Calibration
Step 3
Step 1
Step 2
Step 4
Stop the pump
Run the pump
(no pipes)
Edit O
2
Target
Concentrations
to 20.8%
Remove the gas
source
Wait for the
readings to
stabilise
Span O
2
Channel
@20.8%
Go on to the
Zero All
process
Go on to the
Calibrate CO
2
process with
Mixture 1@5%
Go on to the
Calibrate O
2
process with
Mixture 1@6%
Go on to the
Calibrate O
2
with Air process
@20.8%
Key 3 Target
Concentration set gas
mixtures CH
4
5%,
CO
2
5%, O
2
6%
Mixture 1 - CH
4
5%, CO
2
5%, O
2
6%
(Air CH
4
0%, O
2
20.8%)
Go on to
Calibrate CH
4
process with
Mixture 1@5%
Step 11
Step 12
Step 14
Step 15
Step 16
Step 17
Step 18
Step 19
Step 20
Step 21
Step 22
Step 23
