CM42-MAA101EBE00 Calibration and adjustment
Endress+Hauser 9
3. After 24 hours, check again with the buffer solution.
• If the deviation is within the permitted tolerance range, increase the checking interval
by doubling it for example.
• If the deviation is larger, you must shorten the interval.
4. Continue to proceed as defined in Steps 2 and 3 until you have identified the suitable
interval.
Monitoring the calibration
‣ Define the limit values for monitoring the slope and zero point differentials (SETUP/Sensor
pH/ORP/Sensor diagnostics/Diagnostic limits).
These limit values depend on the process and must be determined by empirical means.
During calibration a diagnostics message is displayed if the defined warning limits have been
exceeded. You then have to service the sensor by cleaning the sensor or reference, or by
regenerating the glass membrane.
You have to replace the sensor if warning messages continue to be displayed despite the
maintenance measure.
2.4.2 Monitoring the calibration interval
If you have established calibration intervals for your process, you can also have the device
monitor them.
Two functions are available to monitor the calibration interval:
1. Calibration timer (SETUP/Sensor pH/ORP/Sensor diagnostics/Diagnostic limits/Calibration
timer)
You specify the calibration interval and the controller generates a diagnostics message
once the set time has elapsed. You then recalibrate the sensor or replace it with a
precalibrated sensor.
The timer is reset with the new calibration.
2. Calibration validity (SETUP/Sensor pH/ORP/Sensor diagnostics/Diagnostic
limits/Calibration expired)
You set time limits to specify how long a calibration should be regarded as valid.
Memosens sensors save all the calibration data. In this way it is easy to see whether the
last calibration took place in the specified timeframe and is therefore still valid. This is
particularly advantageous when working with precalibrated sensors.
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