G F M 4 0 0 S E R I E S U S E R M A N U A L
Gas velocity measurement
IMPORTANT
Schiltknect anemometers do not form part of the ATEX certification of the
GFM series. Contact Gas Data for further advice on the safe use of
these probes.
Before attempting to measure gas
velocity, make sure that the vane
anemometer is long enough to reach the
centre of the pipe through which the gas
is flowing.
Connect the vane anemometer to the
Temperature/Velocity port on the top end
of the instrument case.
Locate a suitable gland or bung on the pipework and insert the vane anemometer,
taking care to ensure that the anemometer is correctly orientated. The arrow on the
tip of the anemometer should be in line with the pipe, NOT at right-angles to it.
When the anemometer is as far into the gland as possible without opening the tap,
re-check the orientation and open the gas tap. Finally, push the anemometer into
the gland far enough to ensure that the vane head is in the centre of the gas pipe.
Press the Next key to switch the instrument
to gas velocity mode. The display screen will
change to show the last retained gas velocity
reading indicated by the highlight around
the velocity figure.
Now press the ‘start sample’ key. The
instrument will now measure the velocity of
the gas flowing through the pipework.
When the reading has stabilised, press the
‘stop sample’ key to retain the reading. This
will return the highlight area around the
velocity figure.
9
GFM400 Series User Manual
Take great care
when inserting the
anemometer to
avoid gas leakage.
GFM400 Series
