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G100 Range
6.2
Gas Measurement Process – Best Practice
Start
Enter ID
Code
ON
& press
Enter
OFF
Default
Logging ID used
Reading Stored
(confirmation
message
displayed)
Gas Measurement Process
(G100 - Best Practice)
Depending on preferences the exact reading procedure can change.
The following method is considered best practice and when followed correctly will allow
quick and consistent readings to be recorded.
1)
When the instrument is first switched on it should be purged with fresh air and
allowed to stabilise for a few minutes.
2)
At this point it is good practice to verify the CO
This option is available via the 'Calibration' menu.
The instrument is now ready to take the first reading.
3)
Connect the sample tube, if relevant (always use the sample filter) from the sample
point to the inlet port of the instrument, ensuring the filter is seated correctly.
4)
Press the 'Pump' key to draw a sample into the instrument.
Notice the main gas readings start to change. It is recommended to run the pump
until the gas readings have stabilised (approx. 30 seconds) then press the soft-key
'Store'.
5)
The pump will stop and the operator will be prompted to enter an ID code to identify
the reading. A "reading stored" confirmation message will be displayed briefly before
returning to the 'Main Read Screen'.
Note:
The ID code prompt can be switched on or off. This option is accessed via
the 'Settings' menu, then press 'Key 1 - Prompt for ID: Yes or No'. If the
ID prompt is set to 'No' the reading is stored using the default logging ID.
6)
After each reading the instrument should be purged with fresh air.
Copyright Geotechnical Instruments (UK) Limited
(Switch on)
Main Read
Instrument
Screen
warm up
ID Code
prompt field
On/Off?
Instrument automatically
returns to the
'Main Read Screen'
Run a
Clean Air
Purge (no
tubes
attached)
Press the
Run until
'Store' key
gas readings have
(pump will
stabilised
stop)
Disconnect
the Sample
Take another
Tube from
NO
reading?
YES
channel. Calibrate only if required.
2
OMG100N1.21
Verify gas
Connect
Sample Tube
from sample
point to inlet
port
Press the
'Pump' key
(draw
sample)
Run a
Clean Air
the inlet
Purge
port
END
Page 27
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