Calibrating The System - ABB Endura AZ series User Manual

Endura AZ series integral and remote transmitter
Combustion oxygen monitor

6.2 Calibrating the System

The calibration routines applicable to calibration types are identified in the right column of the following
table:
<Cal Type>
1-Pt AutoCal
Back
• Return to • Start
Sensor Cal. AutoCal
<Cal Type>
Connect Test Gas 1
Air
20.95 %O2
Abort Continue
• Close test gas
• Continue
valve
calibration
• Return to
procedure
Sensor Cal.
<Cal Type>
O2 20.95 % O2
Abort
• Close test gas
valve
• Return to
Sensor Cal.
IM/AZ20E–EN Rev. F
Start automatic calibration
OK
Waiting For Application Of Test Gas (1
Note. The test gas used for this stage of the calibration is dependent
on the type of calibration and the values of the test gases.
Calibration In Progress (1
Note. The test gas used for this stage of the calibration is dependent
upon the type of calibration and the values of the test gases.
Test gas detection is monitored and, if no test gas is detected, the
calibration fails. Otherwise the test gas valve is opened and the
procedure continues (not applicable if the Test Gas Type is Process
37
Air – see page ).
Test Gas Response Time monitored – if no response to the
application of the test gas is detected the test gas valve is closed and
the calibration fails.
At this point the calibration procedure remains idle while the test gas
delay timer runs (AutoCal only).
Oxygen value is monitored for stability – if the stability criteria are not
met, the test gas valve is closed and the calibration fails.
Once the stability criteria have been met, a cell impedance check is
performed and the test gas valve is closed
If a 1-Pt calibration is being performed, the new calibration coefficient
(Offset or Factor) is calculated. If the new coefficient is outside its
permitted limits (defined by Offset Limit or Factor Limit – see page
42
), the calibration fails and a
Performance Log.
If a 2-Pt calibration is being performed, the process values are
retained for the Calibration Offset & Factor calculations that are
performed after the 2
st
Point)
calibration entry is added to the
nd
-point calibration stage.
6 Calibration
st
Point)
65