Teledyne 9060L - Zirconium oxide flue gas oxygen analyzer - Manual (Page 18)

Operational Theory Model 9060L
Teledyne Analytical Instruments 18
2.2.2 The Zirconia Sensor
Input to the analyzer is obtained from a solid electrolyte oxygen
probe containing a zirconia element and thermocouple. The probe is
designed to be inserted into a boiler or furnace exit gas flue or similar
process. The 9060LEX sensor is designed to be installed outside of the
flue or process. Sampling lines and filters are not required for in-situ
probes but they are required for 9060LEX sensors. When a sampling
line is required, the gas typically flows to the sensor under process
pressure. In applications where the process pressure is negative or
neutral, a suction pump will be required. A reference air pump is not
provided in the Model 9060L Oxygen Analyzer. The internal
construction of a probe or sensor is shown in Figure 2-3.
Figure 2-3: Internal Structure of the Zirconia Sensor and Probe
Heater control in the Model 9060L Oxygen Analyzer consists of a
time proportioning temperature controller and solid state relay so that
the thermocouple junction is controller to over 700°C (1300°F). Probes
operating in a combustion environment above 650°C (1200°F) do not