Maintenance Liquiline CM44P
170 Endress+Hauser
13 Maintenance
Effects on process and process control
‣
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.
L
WARNING
Process pressure and temperature, contamination, electrical voltage
Risk of serious or fatal injury
‣
If a 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.
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, use only genuine spare parts. With genuine parts, the function,
accuracy and reliability are also ensured after maintenance work.
13.1 Cleaning
13.1.1 Controller
‣
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 bases (max. 3% NaOH)
• Soap-based household cleaning agents
NOTICE
Cleaning agents not permitted
Damage to the housing surface or housing seal
‣
Never use concentrated mineral acids or alkaline solutions for cleaning.
‣
Never use organic cleaners such as acetone, benzyl alcohol, methanol, methylene
chloride, xylene or concentrated glycerol cleaner.
‣
Never use high-pressure steam for cleaning.
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