2-32 Installation – ZP Oxygen Sensor System Overview
FlexFit – Linkageless Control – Revision 1.0
PREFERRED
UTILITIES MFG CORPORATION
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Probe
The probe is a stainless-steel assembly that mounts on a 3" 125# ange (at face) located on the ue gas duct or stack. The
probe protrudes into the ue gas stream and directs boiler ue gases from the middle third of the ue gas stream to the detector. The
probe design provides for the removal of the detector for service or replacement without the need for probe removal.
The probe is installed in a manner that the tip of the probe functions as a scoop, when in the ue gas ow. The probe utilizes
the dynamic differential pressure produced by the ue gas velocity and the probe tip as the means to move the ue gas through the
probe. The probe internal pressure drop is very low and high-velocity sample gas ow is provided to the detector, even when the
detector is mounted vertically or upside down.
Figure 2 – 23
Oxygen Sensor Gas Flow
The ZP probe must always be horizontal or pitched down (away from the detector) to prevent the accumulation of condensed
ue gas water at the Detector. Flue gas contains a signicant amount of water vapor. If liquid water contacts the cell (heated to 800
°C), the ceramic will crack and will have to be replaced. This is true for all brands of zirconium oxide oxygen analyzers.
ZP Oxygen Sensor Installation
The optional ZP oxygen sensor is pre-assembled and consists of a detector and a probe. The ZP oxygen sensor is eld installed
into the boiler ue gas outlet to sense ue gas oxygen concentration. The oxygen sensor is a direct sampling in-situ type and does
not require an extractive sampling system.
The general installation procedure for the ZP oxygen sensor is as follows:
CAUTION
Do not drop the detector. If the ceramic zirconium oxide cell
inside the detector is cracked, it must be replaced.
1. Select a stack location.
2. Mount a pipe nipple and 3" 125# at-faced ange on the duct.
3. Mount the ZP sensor on the ange.
4. Check the ange temperature.
5. Run 1/4" calibration gas tubing to oor level.
6. Run conduit from the FlexFit to the ZP oxygen sensor (with exible service loop at the sensor).
7. Pull 190130 cable through the conduit and terminate the wiring.
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