United Process Controls, Inc.
Oxyfire-LT Installation/Operation Manual
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4
VERIFICATION
The oxygen sensor does not require calibration with a certified calibration gas. The Oxyfire-LT includes a
port and fitting for verification of the oxygen measurement and operation of the cell. There are two common
methods used in the verification process.
4.1
Method #1
Inject a certified gas into the verification port and compare the sensor reading to the cal gas. The veification
gas should be regulated to 5 psi maximum and a flow rate not to exceed 2 scfh. The gas will need to exceed
the process gas flow and pressure. The gas will disperse the process gas contained inside the sensor’s outer
sheath and allow the cell to measure the oxygen content of the verification gas. If the gas flow does not
disperse the process gas completely, there will be a slight blending of process and cal gases at the cell. This
can cause the sensor’s readings to vary slightly from the actual oxygen level in the verification gas. It is
recommended to start the cal gas flow at 2 psi and slowly increase to a maximum of 5 psi if required.
4.2
Method #2
Method #2 is to use a portable extractive oxygen analyzer to extract a gas sample from the sensor’s
verification port and compare the portable reading to the sensor reading. Care should be taken to make sure
the portable analyzer is calibrated and accurate. After completing this process, remember to replace the cap
on the verification fitting and tighten to prevent any in-leakage
