Calibration Page - ABB 9438 User Manual

6.2.2 Calibration Page

Calibration involves standardizing the instrument and the sensor by exposing the sensor to air.
During a calibration, retransmission and alarm outputs are automatically held to prevent inadvertent operation of ancillary equipment.
– – – – –
SENSOR CAL.
0 0 0 0 0
Cal. User Code
– – – – –
Calibrate YES
NO
NO
YES
.
8 7 9
Calibrating Air
Abort
for 2 secs
– – – – –
Cal. Aborted
– – – – –
Sensor Eff
OR
– – – – –
Slow Sensor Cal.
.
5 2 0
Recovery Period
D.O.
Press to advance to next parameter
or
Press to return to
Calibration Access
Enter the required calibration code number, between 00000 and 19999. If an incorrect
value is entered, access to calibration is prevented and
Select YES to enable manual calibration and press
Calibrating in Air
The calibration valve opens exposing the sensor to air. A flashing dot indicates that a
calibration is in progress and the displayed value is the sensor reading based on the LAST
calibration. See timings below.
Wait Period
Stability Period
When stability has been achieved the calibration valve closes allowing sample to flow
past the sensor.
Abort Calibration
Pressing
is displayed for 2 seconds. The calibration valve closes allowing the sample to flow past
the sensor again.
Note that the
for the duration of the programmed recovery period.
Sensor Efficiency
A five-bar display provides an indication of the sensor's performance.






Slow Sensor Response
If the output from the sensor does not stabilize during the 1 to 5 minute stability period the
calibration will not be accepted and
Recovery Period
Shows the sample reading as the sensor recovers at the lower sample value. The
Recovery Period is preset at 30 minutes (Cal Time 2).
The display automatically returns to the
1 8 . 1
g/kg
, Section 6.1
Operation Page
Where the sensor is exposed to air before the stability of the sensor is
checked. This is preset at 2 minutes (Cal Time 1).
The readings are monitored for between 1 and 5 minutes until a stable
response is achieved.
during aborts the calibration and the
Calibrating in Air
continues to indicate that a calibration is in progress, and will do so
A2 LED
>85% efficiency
>70% "
>60% "
Pass
>50% "
>40% "
<40% " Low sensor efficiency
Slow Cal.
Operating Page
6 START UP AND OPERATION
Calibration Page
to start the calibration sequence.
Cal. Aborted
will be desplayed.
at the end of this period.
is displayed.
message
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