Geotech G200 - Page 60

Page 60 of 61
Operating Manual
www.geotechuk.com
OMG200N Iss.04
© QED Environmental Systems Ltd.
G 2 00 R A N G E
N
2
O
Nitrous oxide gas.
O
2
Oxygen gas (typically 20.9% in air, measured via
electro-chemical cell).
OEL
Occupational Exposure Limits.
Over range codes
Over range codes are errors above the maximum
allowed reading and will be displayed with more than
chevrons (>>.>).
Person mode
‘Person’ is the soft-key used to begin operating in
personal safety monitoring mode. This mode
automatically stores an average N
2
O reading every 15
minutes. G200 only.
ppm
Parts per million.
Predetermined
Set up prior to use via Analyser Data Manager
software.
Pressure
Maximum input pressure 300mb maximum flow
250ml.
Pump
The device used to transfer a gas sample into the
instrument where that sample is not under pressure.
Select the ‘Pump’ key on the analyser to activate.
Regulator flow
The regulator’s flow is factory set. It only requires a
few turns to open, no adjustment is available.
Sample tube
Tube used to transfer sample gas from the source to
the analyser.
Soda lime CO
2
filter kit
Removes CO
2
when taking a reading. Must be fitted
on the G200 model.
Span
The point at which the gas analyser is calibrated when
a known concentration of the target gas is present.
TWA
Time Weighted Average.
Under range codes
Under range codes are errors below zero and will be
displayed with less than chevrons (<<.<).
User calibration
Users have the facility to calibrate the analyser
between services. User calibration of the gas analyser
will improve the data accuracy in the range of the
calibration gases used.
Warm-up self-test
Predetermined self-test sequence to test the analyser
functions which takes place after the analyser is
switched on and lasts approximately 30-40 seconds.
Warranty
The instrument is guaranteed against defect in
materials and workmanship for a period of 12 months