Page 16 of 127
Operating Manual
OMGEM5KN – Iss. 5.1
Copyright – Geotechnical Instruments (UK) Ltd
GEM5000 OPTIONAL PRODUCTS AND ACCESSORIES
The GEM5000 gas analyser has a number of optional products for purchase which enhance the usability and
enable further analysis of data and reading information.
Note: For more information on the features listed in this section please contact Sales at Geotech on
+44(0)1926 338111 or email Sales@geotech.co.uk.
Pitot tube (optional)
The GEM5000 gas analyser enables the use of a pitot tube to aid accurate flow measurement. The pitot tube is
used for gas extraction systems and the pressure readings are taken in mbar. High gas flow is calculated in the
analyser in m
3
/hr (metres cubed per hour).
Orifice plate (optional)
Geotech recommends the use of orifice plates as good practice when using the GEM5000 gas analyser, enabling
repeatability in flow measurement via a fixed method. Orifice plates are a specialised product and configuration
and Geotech does not currently manufacture or sell spare parts for this product. Please refer to a specialist
supplier if the use of Orifice plates is required.
Temperature probe (optional)
The GEM5000 gas analyser has the facility to automatically display and record the borehole temperature via an
optional temperature probe.
When a temperature probe is fitted the temperature reading will be displayed on the ‘Main Gas Read Screen’
and recorded with all other data.
Note: Temperature probes with an Ex label are part of the GEM5000 Ex certification SIRA 11ATEX2197X and
IECEx SIR11.0089X, and therefore certified for use under the same conditions as the analyser.
Anemometer (optional)
The GEM5000 gas analyser has the facility to automatically display and record high flow via an optional
anemometer probe. It is designed to plug into the instrument and instantly provide a flow indication. An
anemometer probe adds flow measurements to the professional reporting ability of the GEM5000 range along
with gas concentrations, pressure and temperature.
The anemometer has a simple connection, a narrow diameter measurement head (11mm), a wide temperature
operating range (up to 80oC) and indicates flows up to 40 m/sec.
When an anemometer probe is fitted to the analyser the flow will be displayed in the ‘Main Gas Read Screen’
and recorded with all other data.
Flow can be measured in either m/s (gas velocity) or m3/hr (volume flow rate). In order to calculate the volume
flow rate the pipe diameter will need to be entered into the instrument, either manually or via the Gas Analyser
Manager software.
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