Proline t-mass 65 PROFIBUS DP/PA Maintenance
Endress+Hauser 85
7 Maintenance
Generally, the flowmeter requires no special maintenance work, particularly if the gas is clean and
dry.
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Warning!
Hazardous area approvals may demand that the device be returned to an Endress+Hauser
production centre for service ( ä 106) or that work can only be carried out by a qualified
Endress+Hauser service person. Consult your Endress+Hauser service representative for more
information.
7.1 External cleaning
When cleaning the exterior of measuring devices, always use cleaning agents that do not attack the
surface of the housing and the seals.
7.2 Pipe cleaning
The sensor is capable of withstanding clean in place (CIP) processes using heated liquids or steam
(SIP), within the maximum specified temperature limits. However the sensor measurement will be
adversely affected during the cleaning cycle and a settling down period will be required after the
cycle to allow the process and sensor temperatures to re-stabilise.
!
Note!
The POSITIVE ZERO RETURN function maybe activated to set the current output to zero flow
during such cycles. See "Description of Device Functions" manual for more information.
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Caution!
Do not use a pipe cleaning pig.
7.3 Transducer cleaning
For gases that do carry impurities, it is recommended that the sensor be routinely inspected and
cleaned to minimise any potential measuring errors due to contamination or build-ups. The
frequency of inspection and cleaning will depend upon the application and expected measurement
performance.
Cleaning is performed by applying a non-filming or oil-free type cleaning fluid to a soft brush or cloth
and gently wiping over the surface until all build-ups and contaminants are removed.
"
Caution!
• Use care not to bend the sensing elements of the transducer during cleaning.
• Do not use abrasive materials or fluids corrosive to the sensor materials and seals.
Sensor-specific information:
•t-mass F sensor:
Removal of the transducer requires specialist knowledge, tools and parts. The process seal also
may need to be tested and re-qualified. This procedure must be carried out by an Endress+Hauser
production centre.
•t-mass I sensor:
When removing the measuring sensor, observe the safety guidelines in chapter "Installation"
ä 19.
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