
2.4 Monitoring and safety features
Safety features
The transmitter is protected against external
influences and damage by the following
design measures:
• Rugged housing
• Degree of protection provided by
enclosure: IP 65 (CPM 253)
• UV resistance
Monitoring features
In the event of a system error or power failure,
an alarm condition is signalled via a fault-
signalling contact.
2.5 Immunity to interference
This instrument has been tested according to
the applicable European standards for
industrial applications with regard to electro-
magnetic compatibility. It is protected against
electromagnetic interference by the following
design measures:
• Cable screen
• Interference suppressor filter
• Interference suppression capacitors
Warning:
The specified immunity to
interference only applies for devices
connected as outlined in these
operating instructions.
2.6 Declaration of conformity
The CPM 223/253 transmitter has been
developed and manufactured in accordance
with currently valid European standards and
directives.
E+H certifies the compliance with the
standards by using the 4 sign.
PM253E02.CHP
Liquisys M CPM 223 / 253 Safety
Endress+Hauser 5
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