Table of Contents
Advertisement
Calibration
4.1 Calibration Diagnostics
Introduction
The manual standardization adjustment changes the zero offset diagnostics used by this
system. This value is viewed as read-only information. It is good practice to observe this
value after calibration. Monitoring the value over time will help you predict when the
electrode will need to be replaced.
Zero Offset Value
When Online ORP value is displayed, PRESS
Zero Offset value.
Zero Offset is non-volatile and is initialized to 0 mV at unit reset.
It has a range of ± 120 mV and it is updated after each calibration.
60 Second Timeout
If no key is pressed for 60 seconds, the display will abort the entry mode and default to Online
Display.
4.2 Calibration Diagnostic Reset
Introduction
When a new electrode is installed, the indicated ORP will use the zero offset value from the
previous calibration. Depending on the condition of the replaced electrode, the difference
between the known and indicated ORP of the new electrode may vary as much as several
millivolts. A calibration on the new electrode will correct this difference.
Zero Offset ORP Value
a) Momentarily press
the
button until the Zero Offset ORP value resets to factory default "0".
1
b) Press MODE button, or wait 60 seconds, to return to Online ORP.
4.3 Calibration
Overview
Calibration consists of the following function:
• Calibrating the Zero (Standardization) – Manual ORP calibration. In manual
calibration, you can select a new ORP value above or below the recognized live ORP
value.
14
4. Calibration
to view the Zero Offset value. From this display press and hold
1
DirectLine® DL422 Sensor Module User Manual
button momentarily to display the current
1
1/03
Advertisement
Table of Contents
