Calibration Procedures; Table 4-1 Calibration Procedure - Honeywell DirectLine DL424 User Manual

Calibration

4.3 Calibration Procedures

ATTENTION:
In Table 4-1, under the Press column:
 Hold means to hold the button down until the display changes.
 Momentarily means to press and release the indicated button.
Step Operation
1 Air Calibration
20

Table 4-1 Calibration Procedure

Press
ACal
Hold
(3 seconds)
ACal
Momentarily
DirectLine® DL424/425 Sensor Module User Manual
Display
ACAL
To cancel, press Mode button.
Air Calibration will be initiated.
 The output is held at its current
Percent-of-range value
 The display flashes ACAL while on-
line DO and Temperature
measurements are monitored for
stability.
After 20 seconds of stability, the
Sample Calibration Trim value is reset
to 1.0 and a new Air Calibration is
calculated and the display returns to
On-line DO.
Air Calibration will fail if stability is NOT
achieved after 30 seconds
 "FAIL" will display to indicate Air
Calibration failure, followed by the
message Stbl. The previous Air Cal
Factor and Sample Trim values will be
retained.
Press the MODE button to return to On-
line display.
If any errors occur during calibration,
FAIL will display briefly followed by and
error message. Refer to "On-line
Diagnostics" for a list of error messages
and "What to do". The previous Air Cal
Factor and Sample Trim values will be
retained.
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