Endress+Hauser Liquiline M CM42 - Sensor Status

Diagnostics, troubleshooting CM42-MAA101EBE00
28 Endress+Hauser
3. Change the sensor. Make sure the new sensor matches the required sensor name or group.
 Once you have connected the new sensor, the message "Initializing sensor" is displayed
and afterwards the message "Sensor has valid TAG" (or "Sensor has valid TAG group")
appears.
You can now choose whether you want to use the sensor or repeat the sensor change
routine. You can also display the sensor data.
If you have connected a sensor with an invalid sensor name or group, a message is displayed to
this effect. The device will not accept this sensor. You can only repeat the sensor change with a
valid sensor.
4. Follow the instructions on the display.
• After changing the sensor or aborting the function, the hold is automatically deactivated once
the hold delay time has elapsed.
• If you do not manage to change the sensor within 10 minutes, an automatic system abort
takes place and the device returns to the measuring mode.
• If you are connecting a different type of sensor, you are prompted to change the projecting
version. The change involves a device restart.
3.11 Sensor status
The device displays calculation variables of the calibration function, such as the zero point and
slope, and the related quality, i.e. to what extent they deviate from the ideal values.
You also see the sensor operating time.
From the information displayed, you can see whether and when you must schedule
maintenance measures for the sensor, whether the sensor has to be calibrated shortly or
whether you will have to replace the sensor soon.
You can display the values graphically (as a bar graph) or numerically (selection using soft keys).
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Abb. 5: Graphic display of the sensor status (example)
1 Calibration date, e.g. slope: value is within an acceptable range
2 Calibration date, e.g. zero point: value is within an acceptable range
3 Operating time: specified duration exceeded: error is displayed
You can set warning and alarm limits in the "SETUP/Sensor pH/ORP/Sensor diagnostics"
menu.