OMGEMN1.41
GEM2000 Range Gas Analysers
Page 90
Copyright 2009 Geotechnical Instruments (UK) Limited
17.0 GEM2000 Range Glossary of Terms
Analyser error messages
Operational errors are prefixed on the analyser
by the word ERROR followed by an error code.
Refer to the list of standard error codes for more
information.
Analyser warning
Analyser warnings are prefixed by the word
WARNING followed by a relevant description.
There are two types of warning messages
displayed; general warnings that may not
necessarily affect the instrument’s function, for
example, battery power low and operational
parameters that could affect the performance of
the analyser, for example, CH
4
out of
calibration.
Anemometer probe
Device for measuring velocity of gas in the pipe.
The GEM2000 analyser can be set to convert
into a flow. See also flow measurement.
ATEX certification
The GEM2000 and the GEM2000 Plus are ATEX
certified. Sira 06ATEX2202X
Auxiliary channel
This refers to the channels where external
devices will be connected or displayed.
Backlight
The analyser has a built-in backlight for low
ambient light conditions. This can be toggled
on/off using the backlight key.
Barometric pressure
The atmospheric pressure at the given location.
Borehole
Typical location from which a gas sample is
obtained.
Borehole flow
The flow of gas at the borehole sample point.
Calibration
The Geotechnical Instruments range of gas
analysers is carefully calibrated against known
standards.
Calibration record
The GEM2000 range has the facility to log user
calibrations as a validation tool.
CH
4
Methane
Chemical cells
A method of gas detection that works on the
basis of a chemical reaction with the target gas.
CIRIA
The CIRIA guideline ‘Assessing the risks posed
by hazardous ground gases to buildings’
proposes that gas concentrations and flow rates
should be monitored.
CL
2
Chlorine
