Maintenance Liquisys M CLM223/253
90 Endress+Hauser
Error Possible cause Tests/remedial action Execution, tools, spare
parts
Wrong software SW version, see field E111.
Bus problem Remove some devices and
repeat the test.
Contact Endress+Hauser
Service.
9 Maintenance
L
WARNING
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.
‣
Make sure the device is de-energized before you open 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.
The maintenance of the measuring point comprises:
• Calibration
• Cleaning the controller, assembly and sensor
• Checking the 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.
NOTICE
Electrostatic discharge (ESD)
Risk of damaging the 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, only use genuine spare parts. With genuine parts, the function,
accuracy and reliability are also ensured after maintenance work.
9.1 Maintenance of the entire measuring point
9.1.1 Cleaning the transmitter
Clean the front of the housing using commercially available cleaning agents only.
The front of the housing is resistant to the following in accordance with DIN 42 115:
• Ethanol (for a short time)
• Diluted acids (max. 2% HCl)
• Diluted alkaline solutions (max. 3% NaOH)
• Soap-based household cleaning agents
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.
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