2223A Oxygen Transmitter Functional Safety Manual
02223006A / Revision 0
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3.6.2 Checks where pressure compensation is used.
1.
Take appropriate action to ensure that spurious outputs will not compromise safety or
cause false trips.
2.
Using the built-in analog output test feature, set the output to 0.0mA and verify that
the correct current is generated. Repeat with the output set to 20.0mA.
3.
Navigate to the Transmitter Diagnostics form and view Calibrated Pressure. Check
that the reading displayed is within an acceptable tolerance of the actual pressure.
4.
Calibrate the pressure sensor.
5.
Carry out a full low and high calibration of the oxygen measurement.
6.
Carry out pressure compensation calibration.
7.
Perform a reference measurement with an oxygen concentration between the low
and high calibration points. Check the mA output current and verify that it is within
the required tolerance.
8.
If an internal flow sensor is fitted, alter the flow of gas through the analyser and
check that the flow alarms are triggered at the appropriate levels.
9.
Restore normal operation.
3.6.3 Routine
calibration
Regular full calibrations should be carried out as recommended in the operator manual.