Teledyne 9060 - Zirconium oxide flue gas oxygen analyzer - Manual (Page 28)

9060-Zirconia Analyser
take approximately five minutes to install a 500 mm (20”) probe, moving it in about 50 mm
(2”) steps.
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
1231 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
center 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 phenomena is normally caused by stratification of the flue gas.