ABB Endura AZ10, User Manual, Page: 67 / 102

Endura AZ series integral and remote transmitter
Combustion oxygen monitor 6 Calibration
IM/AZ20E–EN Rev. F 65
6.2 Calibrating the System
The calibration routines applicable to calibration types are identified in the right column of the following
table:
Start automatic calibration
1
-Pt A
u
to
C
a
l
2
-Pt A
u
to
C
a
l
• Return to
Sensor Cal.
• Start
AutoCal
• Close test gas
valve
• Return to
Sensor Cal.
• Continue
calibration
procedure
Waiting For Application Of Test Gas (1
st
Point)
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. M
a
n
u
al
Cal –
Of
fset
M
a
nual
C
a
l
– Fac
tor
Man
u
al C
a
l – 2
-Pt
• Close test gas
valve
• Return to
Sensor Cal.
Calibration In Progress (1
st
Point)
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
Air – see page
37
).
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 calibration entry is added to the
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
nd
-point calibration stage.
1-Pt Auto
C
a
l
2-Pt Auto
C
a
l
Manu
al Cal
– Of
fset
Manu
al
Cal
– F
acto
r
Manual Cal
– 2-Pt
<Cal Type>
1-Pt AutoCal
Back OK
<Cal Type>
Connect Test Gas 1
Air
20.95 %O2
Abort
Continue
<Cal Type>
O2 20.95 % O2
Abort