4.2 Calibration Notes
1. A Zero calibration should be performed at least monthly. In low
conductivity applications (where a zero error is particularly significant)
a zero calibration may have to be done weekly.
2. A Standard calibration should be performed at least weekly. Of course,
more frequent calibration will result in greater confidence in results.
3. The WP-81 does not require re-calibration when alternating between
Conductivity, TDS and Salinity modes.
4. All calibration information is retained in memory when the WP-81 is
switched off, even when the battery is removed. This information can
be recalled or printed later using the GLP function (see section 8).
5. The WP-81 displays the value of the standard to which it will attempt to
calibrate. Ensure that the standard value displayed corresponds to the
standard that you are using.
6. If the WP-81 does not recognise the standard, it will display the
message, “NOT STD” during calibration. Calibration will fail if this
message is displayed.
4.3 Calibration Messages
1. If a Zero calibration has been successfully performed, the WP-81 will
display the following message, and the zero value of the sensor. For
example…
Calibrate OK
Zero= 0.00 uS
2. If a Standard calibration has been successfully performed, the WP-81
will display the following message, and the k factor of the sensor. For
example…
3. If a Standard calibration has failed, the WP-81 will display the following
message, and the failed k factor of the sensor. For example..
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