Endress+Hauser Liquiline M CM42 - Temperature Adjustment

Calibration and adjustment CM42-MAA101EBE00
12 Endress+Hauser
Fluctuations in the process value should not exceed ±0.5 pH and the process temperature must
remain relatively constant. As the measuring range is limited as a result, it is possible to set the
slope to -59 mV/pH (at 25 °C).
Alternatively, you can also use the "sample calibration". Here, you take a sample from the process
and determine the pH value in the laboratory. In the case of the laboratory sample, you must
make sure that the pH value is determined at the process temperature.
Measuring the ORP in mV
You enter the offset directly with this type of calibration. Use the measured value of a reference
measurement, for example, to determine the offset.
2.7.2 Sample calibration (grab sample cal., only pH)
With this type of calibration, you take a sample of the medium and determine its pH value (at
process temperature) in the laboratory. You then use this laboratory value to adjust the sensor.
This does not change the slope of the calibration function.
2.7.3 With ORP buffers (only measurement of the ORP)
With this type of calibration, you work with calibration buffers, e.g. ORP buffers from
Endress+Hauser.
For this purpose, you remove the sensor from the medium and calibrate it in the laboratory.
Since Memosens sensors save the data, you can always work with "precalibrated" sensors and do
not have to stop monitoring the process for extended periods to perform a calibration.
Only use calibration buffers once.
2.8 Temperature adjustment
The temperature sensor has to be calibrated at regular intervals to ensure the measured value
is not falsified by incorrect temperature measurement.
1. Determine the temperature with a reference measurement.
2. Depending on the result, decide whether you want to align the temperature sensor of the
sensor with the reference temperature.
If you do:
3. Go to the "CAL/Temperature" menu.
 The current offset is displayed. Mode is for information purposes only. You cannot select
anything here.
4. Start the adjustment and follow the instructions.
 The transmitter shows the temperature currently measured by the temperature sensor
of the sensor.
5. Enter the temperature of your reference measurement and select "Continue".
 The new offset is displayed.