Maintenance Liquisys M CPM223/253
88 Endress+Hauser
8 Maintenance
Take all the necessary measures in time to guarantee the operational safety and reliability
of the entire measuring system.
Maintenance work at the transmitter comprises:
• Calibration (see "Calibration" section)
• Cleaning of assembly and sensor
• Cable and connection check
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 spare parts, the
function, accuracy and reliability are also guaranteed after repair.
8.1 Maintenance of the entire measuring point
8.1.1 Cleaning the transmitter
Clean the front of the housing with usual commercial cleaning agents.
In accordance with DIN 42 115, the front is resistant to:
• Ethanol (short periods)
• Diluted acids (max. 2% HCl)
• Diluted bases (max. 3% NaOH)
• Soap-based household cleaners
Prohibited cleaning agents
Damage to the housing surface or housing seal
‣ For cleaning purposes, never use concentrated mineral acids or bases.
‣ Never use organic cleaners such as benzyl alcohol, methanol, methylene chloride, xylene
or concentrated glycerol cleaner.
‣ Never use high-pressure steam for cleaning purposes.
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