Endress+Hauser Levelflex FMP56 Operating Instructions Manual page 83

Levelflex FMP56, FMP57 HART
Endress+Hauser
14 Maintenance
No special maintenance work is required.
14.1 Exterior cleaning
When cleaning the exterior, always use cleaning agents that do not corrode the surface of
the housing and the seals.
14.2 General cleaning instructions
Dirt or buildup may form on the probe depending on the application. A thin, even layer has
little impact on the measurement. Thick layers can dampen the signal and reduce the
measuring range. Very uneven deposit formation or caking (e.g. due to crystallization) can
result in incorrect measurements. In such cases, use a non-contact measuring principle, or
regularly inspect the probe for contamination.
Cleaning with sodium hydroxide solution (e.g. in CIP procedures): if the coupling is wetted,
larger measurement errors can occur than under reference operating conditions. Wetting
can cause temporary incorrect measurements.
Maintenance
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