2-30 Installation – ZP Oxygen Sensor System Overview
FlexFit – Linkageless Control – Revision 1.0
PREFERRED
UTILITIES MFG CORPORATION
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AA
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ZP Oxygen Sensor System Overview
Figure 2 – 19
OXYGEN SENSOR
Detector
Probe
7-wire Cable
NEXTBACK RESET
ENTER
ESC
ALARM
SILENCE
Home
Menu
Fuel
Air
Air VSD
Aux 1
Aux 2
Prefrerred Utiliteis Manufacturing Corp• Danbury, CT
ZP Oxygen Sensor with FlexFit CC
Monitoring ue gas oxygen levels minimizes fuel expense and ensures safe combustion for all combustion processes. The
optional FlexFit model ZP oxygen analyzer system consists of a pre-assembled ZP oxygen sensor (detector and probe) and connecting
cable (p/n 190130). The ZP oxygen sensor is eld installed into the boiler ue gas outlet to sense ue gas oxygen concentration.
The Model ZP detector is an in-situ, direct insertion, zirconium oxide element with proven accuracy and long-term stability and
does not require an extractive sampling system. The heater is a reliable ceramic element. The detector uses ambient air (instead
of plant compressed air) for its reference, so it is immune to damage caused by water and oil in compressed air systems. The ZP is
suitable for use in processes red by gas, all grades of oil, and process off-gases.
A standard 3" ange is used to mount the ZP probe. The sample gas lter can be cleaned without removing the probe from the
stack. The detector can be repaired or replaced without removing the probe from the stack. The ZP oxygen probe is directly wired to
the FlexFit Combustion Controller (eliminates a eld mounted transmitter), which simplies installation. The FlexFit provides digital
zirconia cell temperature control, electrical isolation, diagnostics, and multiple alarms. Calibration is simple: connect the test gas
and press a button.
Detector
The detector consists of a zirconium oxide (zirconia) cell, a ceramic heater with a thermocouple, terminals for connecting to
the FlexFit, a ange for connection to the probe, an opening to accept reference (ambient) air, and a connection for calibration gas.
Figure 2 – 20
Calibration
Gas Inlet
Conduit
Quartz
Filter
Ceramic
Filter
Ceramic
Heater
Box
Terminal
Box Cover
Furnace Environment Air Environment
ZP Detector
Measuring Principle
The detector works on a principle that, when heated to 800 °C (1472 °F), the cell generates an electrical signal directly related
to the oxygen concentrations of the ue gas. Flue gases are passed through a lter to prevent dust and dirt from contaminating the
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