3.2 Conductivity 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. Conductivity and Salinity calibration data is stored separately in memory.
Ensure that the MC-81 has been correctly calibrated for the mode in which it
will be used. The MC-81 does not require re-calibration when alternating
between Conductivity and Salinity modes, providing the instrument has been
correctly calibrated for both.
4. All calibration information is retained in memory when the MC-81 is
switched off, even when the battery is removed.
3.3 Conductivity Calibration Messages
1. If a Zero calibration has been successfully performed, the MC-81 will display
the following message.
Zero
Cal. OK
2. If a Standard calibration has been successfully performed, the MC-81 will
display the following message, and then the span of the electrode.
eg: Span then: Span
Cal. OK 100.0%
3. If a Standard calibration has failed, the MC-81 will display the following
message, and then the failed span value of the electrode.
eg: Span then: Span or: Unknown
Cal.Fail 60.0% Standard
Note that the decimal point is replaced by a ∗ when a Standard calibration
fails.
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