OMG100N1.21
G100 Range
Page
26
Copyright Geotechnical Instruments (UK) Limited
6.0 Taking Readings
6.1 Preliminary Checks - Best Practice
Warning
Always ensure that the exhaust gases emerge in a safe manner into
a well ventilated area.
Prior to use, it is good practice to ensure that:
Step 1
The instrument has the correct
time and date set.
Step 2
Fit the sample filter checking that it
is clean and dry. If experiencing
condensation in sample line or the
sample filter keeps getting blocked,
fit the moisture trap or similar at
take-off point.
Step 3
The battery has a good charge
(minimum 25% charge, even if
only a few readings are required).
Step 4
The memory has sufficient space
available.
Step 5
The main gases have been verified
with zero gas concentration
present.
Step 6
If necessary check the span
calibration with a known
concentration calibration-check
gas.
Step 7
Take readings.
Do protect the instrument from strong direct
sunlight which will quickly raise the temperature of
the instrument beyond its operating range and the
LCD display will appear almost black. The contrast
setting cannot then alter the contrast.
Do remember to always use the sample filter! If the
sample filter becomes flooded, change it and
ensure all sample tubes are clean and dry before
re-use.
Don’t place the instrument against anything hot as
this may cause excessive internal temperatures
which can lead to erroneous readings.
Don’t get the instrument wet, for example exposure
to rain.
Instrument
has correct
time and
date set
Preliminary Checks
(G100 - Best Practice)
Battery has
good
charge
Start
Take readings
Step 1
Fit the
required
filters
Memory has
sufficient
space
Main gases
verified
Check span
calibration
Step 2
Step 3
Step 6
Step 7
Step 4
Step 5