GA5000 Gas Analyzer
OMGA5KN4.6
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8.7 How to use an anemometer (optional)
The GA5000 gas analyzer has the facility to attach an anemometer device enabling the site
engineer to measure the flow of gas within an extraction system. The anemometer can be
set to display two values; m/s (meters per second) and m
3
/hr (metres cubed per hour).
It is best practice to take the gas reading first before taking the flow reading with the
anemometer attached.
If using a ‘borehole ID’ the internal pipe diameter can be predetermined in the optional
Landtec Systems Gas Analyser Manager (LSGAM) software. Once set, the site engineer
cannot edit the pipe diameter setting.
If the site engineer is not using a borehole ID or the pipe diameter is not set in LSGAM the
operator will be prompted to enter a pipe diameter with a new ID on the analyzer. Select
soft-key ‘Next ID’ from the Main Gas Read screen, followed by soft-key ‘Add’ and add a
new borehole location.
In order to use the anemometer it is important to know the internal diameter (ID) of the
pipe if you want to calculate the flow in m
3
/hr (metres cubed per hour). This must be the
internal diameter not the outer diameter (OD) i.e. pipe outer diameter minus twice the
pipe wall thickness.
For example:
If you do not have any suitable monitoring points you will need to drill (tap of ¾” BSP pipe
thread) a hole in the piping of between 25mm and 30mm in diameter to seat the conical
fitting on the anemometer (which is roughly between 20mm to 34mm). When not in use
the hole can be re-sealed with a ¾” BSP male bung.
Note: When the anemometer is not in use the conical fitting should be placed over
the probe to protect it.
The anemometer must fit centrally (the conical fitting must be set on the probe to half the
Pipe ID
Pipe OD
Wall Thickness
