39
SAMPLING THE FLUE GAS
Once the automatic calibration procedure has been completed and the specific fuel has
been selected the probe can be inserted into the desired sampling point.
It is recommended that the sampling point be located at least two flue diameters
downstream of any bend and that the probe tip is in the centre of the flue (this is normally
the point of the hottest temperature). With balanced flues and other industrial units the
probe should be positioned far enough into the flue so that no air can ‘back flush’ into the
probe.
The probe depth stop cone provided with the instrument allows the probe to be used in
holes whose diameters range from 8 mm to 21 mm (
5
/
16
to
4
/
5
inch).
The standard probe is rated at 650
C/1202
F. Temperatures of up to 1100
C/2012
F can
be accommodated using an optional high temperature probe.
TIP:
To conserve battery power, switch off the pump when you are not taking a
measurement. Use the pump key to turn the pump ON and OFF.
LONG TERM MONITORING
There are a number of things that need to be considered for successful long term
unattended monitoring:
The provision of enough power for the duration of the test
The capability to empty the water trap
Regular fresh air purging of the sensors
Protection from rain or water spray from the process being monitored.
If a mains power source is being used it is strongly recommended that the supply
cable is protected by a suitable Residual Current Device (RCD).
Unless the water trap is to be regularly inspected then a pumped water trap should be
Summary of Contents for 9206 Quintox
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