OMBIO5KN4.1
BIOGAS 5000 gas analyser
Page
46
Copyright Geotech
8.5
How to use an anemometer (optional)
The BIOGAS 5000 gas analyser 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
Gas Analyser Manager (GAM) 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 GAM the
operator will be prompted to enter a pipe diameter with a new ID on the analyser.
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
Pipe ID
Pipe OD
Wall Thickness
