Maintenance Liquiline CM442/CM444/CM448
138 Endress+Hauser
12 Maintenance
Process pressure and temperature, contamination, electrical voltage
Risk of serious or fatal injury
‣ If the sensor has to be removed during maintenance work, avoid hazards posed by pressure,
temperature and contamination.
‣ De-energize the device before opening it.
‣ Power can be supplied to switching contacts from separate circuits. De-energize these
circuits before working on the terminals.
Take all the necessary precautions in time to ensure the operational safety and reliability of the
entire measuring point.
Maintenance of the measuring point comprises:
•Calibration
• Cleaning the controller, assembly and sensor
• Checking cables and connections
When performing any work on the device, bear in mind any potential impact this may have on
the process control system or on the process itself.
Electrostatic discharge (ESD)
Risk of damage to electronic components
‣ Take personal protective measures to avoid ESD, such as discharging beforehand at PE or
permanent grounding with a wrist strap.
‣ For your own safety, use only genuine spare parts. With genuine parts, the function,
accuracy and reliability are also ensured after maintenance work.
12.1 Calibration
Sensors with Memosens protocol are calibrated at the factory.
Users must decide whether the process conditions present require calibration during initial
commissioning.
Additional calibration is not required in many standard applications.
Calibrate the sensors at sensible intervals depending on the process.
All information on calibration is provided in BA01245C "Memosens".
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