Calibration - Honeywell DirectLine DL421 User Manual

Zero Offset pH Value and Percent Theoretical Slope Value
a) Momentarily press
hold the
1
The Percent Theoretical Slope value resets to factory default "100.0" at the same
time (approximately 10 seconds).
b) Press MODE button, or wait 60 seconds, to return to Online pH.

4.3 Calibration

Overview
ATTENTION:
If a Solution Temperature Compensation Coefficient was selected per Configuration Section 3.2, this
coefficient is disabled while calibration is being performed.
Calibration consists of the following functions:
• Calibrating the Zero (Standardization) – Manual or automatic pH calibration. In
auto calibration, you can select one of the other buffer pH values directly above
or below the recognized buffer value in the current buffer group. (See Table
4-1.)
• Calibrating the Slope - Manual or automatic pH calibration. In auto calibration,
you can select one of the other buffer pH values directly above or below the
recognized buffer value in the current buffer group. (See Table 4-1.)
2/04
to view the Zero Offset value. From this display press and
1
button until the Zero Offset pH value resets to factory default "0.00".
DirectLine® DL421 Sensor Module User Manual
Calibration
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