G F M 4 0 0 S E R I E S U S E R M A N U A L
Gas temperature measurement
Connect the temperature probe into the Temperature/Velocity port on the top of
the instrument case.
Locate a suitable gland or bung on the pipework and insert the temperature probe.
When the probe is as far into the gland as possible without opening the tap, open
the gas tap. Finally, push the probe into the gland far enough to ensure that the tip
is in the centre of the gas pipe.
Now press the ‘start sample’ key. The instrument will now measure the
temperature in the site pipework.
When the reading has stabilised, press the ‘stop sample’ key to retain the reading.
This will return the highlight area around the temperature figure.
Remove the
temperature probe from the pipe.
Gas velocity measurement
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 GFM430 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 ‘start sample’ key. The instrument
will now measure the velocity of the gas
flowing through the site 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.
Carefully remove the vane anemometer from the gland on the gas pipe, pausing to
turn off the gas tap before removing it completely. Press ‘Next’ to go to next
screen.
15
GFM400 Series User Manual
Take great care
when inserting the
temperature probe
to avoid gas
leakage.
Take great care
when removing the
temperature
probe. In
particular, avoid
standing with your
face in direct line
with the gland
because gas can
be expelled at
great force.
Take great care
when inserting the
anemometer to
avoid gas leakage.
Take great care
when removing the
anemometer. In
particular, avoid
standing with your
face in direct line
with the gland
because gas can
be expelled at
great force.
GFM400 Series
