Teledyne 9060Z - Zirconium oxide flue gas oxygen analyzer - Manual (Page 16)

Model 9060Z Manual
16
Probes can be mounted at any angle. However, if the probe is to be mounted on a vertical duct wall, it
is better to angle the probe (approx. 15°) down to avoid process condensation inside the cold end of
the probe. If there are any particulates in the flue gas, a filter can be omitted by pointing the probe
vertically downwards. Otherwise the transmitter can be configured to automatically purge the filters
,
or they can be replaced periodically.
Oxygen Probe Mounting
CAUTION
It is important that there is no air in leakage upstream of the oxygen sensing point otherwise
there will be a high oxygen reading.
If the probe is to be installed on a bend in the flue, it is best located on the outer circumference
of the bend to avoid dead pockets of flue gas flow. While the standard 9060 probe with a ‘U’
length of 250 mm (10”) will suit most low temperature flue applications, it is occasionally
necessary to have a longer probe with the sensing tip in the centre of the flue gas stream.
Although it is rare, occasionally a probe may sense oxygen vastly differently from the average
reading in the flue gas. If it occurs, then the probe should be moved, or a longer probe
installed. This phenomenon is normally caused by stratification of the flue gas.