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< 9. Calibration >
9-9
IM 11M12D01-01E
9.3 Performing Calibration
NOTE
1) Perform calibration under normal working conditions (e.g. continuous operation with sensor
mounted on furnace).
2) Perform both Span and Zero calibration for best resultant accuracy.
3) When instrument air is used for the span calibration, remove the moisture from the instrument air
at a dew-point temperature of -20°C and also remove any oily mist and dust from that air.
4) If dehumidifying is not enough, or if foul air is used, the measurement accuracy will be adversely
affected.
9.3.1 Performing Manual Calibration
To perform manual calibration, you open or shut calibration gas valves following messages on the
display. Solenoid valves can be opened and closed automatically at the same time the messages are
displayed on the display. For details, see Subsection 7.9.2, Performing Manual Calibration.
9.3.2 Semi-Automatic Calibration
Semi-automatic calibration is started either from the display or by external contacts. When started
from the display, only the channel selected on the display is calibrated. When started by an external
contact, all working channels can be calibrated one channel after another.
Here we give an example of the procedure for both of these cases, with both Span and Zero
calibration selected.
<Calibration Procedure>
Starting Semi-Auto Calibration from the Display
1) From the basic display if you touch the Setup key, the [Execution/Setup] display appears. Select
[Calibration].
2) Next select [Semi-auto calibration]. The [Semi-auto cal.] channel select display, Figure 9.8, is
displayed.
3) Select the channel to be calibrated. The [Semi-auto cal.] display, Figure 9.9, is displayed.
4) When you select [Start calibration] the [Semi-auto cal.] trend graph of Figure 9.10 is displayed,
and Span calibration begins.
5) When the preset calibration time has elapsed, Span calibration ends and Zero calibration begins.
Likewise, when the preset calibration time has elapsed, Zero calibration ends. After a preset
stabilization (settling) time, the instrument reverts to measurement mode.
6) Touch the Reject key (icon of door with arrow) to abort calibration. If you abort Span or Zero
calibration then calibration time is skipped and stabilization (settling) time starts. If you touch
the Reject key again then stabilization (settling) time is also skipped, and you revert to the Basic
display.
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