OMG200N1.23
G200 Analyser Range
Page
32
©
Copyright 2010 Geotechnical Instruments (UK) Limited
6.2 G200 Gas Measurement Process – Best Practice
Depending on preferences the exact reading procedure can change. The following methods
are considered best practice and when followed correctly will allow quick and consistent
readings to be recorded.
Gas Measurement Process
(G200 - Best Practice)
Make sure
you have
carried out
all the
preliminary
checks prior
to taking a
reading
Main Read
Screen
Select mode
Log in
Start
Auto monitoring
is enabled
Enter or
select site
ID &
sample
point code
END
Select soft
key for
mode to
stop
logging
ID Code
prompt field
On/Off?
ON
(Switch on)
Instrument
warm up
Person or Area
Mode?
YES
NO
LEAK MODE
Person or Area
Mode?
Enter stop
code to exit
logging &
press enter
YES
NO
1)
When the instrument is first switched on it should be purged with fresh air and
allowed to stabilise for a few minutes.
2)
Make sure that you have carried out all the preliminary checks as listed in section ‘6.1
Preliminary Checks – Best Practice’ and that the instrument is ready to take the first
reading. Always use a sample filter and a soda lime filter with a G200 instrument.
3)
Connect the sample tube, if relevant, from the sample point to the inlet port of the
instrument, ensuring the filter is seated correctly.
4)
From the ‘Main’ menu select the mode in which you wish to operate the instrument.
"
Note: Although the G200 analyser is intended for use in a specific mode, i.e.
Person, Area or Leak, the analyser may be used to take readings without a
mode specified. For more information please refer to section ‘6.3 – G210
Gas Measurement Process Best Practice’.
5)
If ‘Person’ or ‘Area’ mode is specified the operator will be prompted to enter a ‘Site’
and ‘ID’ to identify the reading. If the operator chooses to monitor readings in ‘Leak’
mode then no ID is required.
6)
If operating in ‘Person’ or ‘Area’ mode readings are continuously taken by the
instrument. To stop monitoring the operator must select the appropriate ‘soft-key’
and enter the required stop code.
7)
If operating in ‘Leak’ mode the operator may start and stop monitoring by selecting
the appropriate soft-key.
