Endress+Hauser Proline t-mass 65 PROFIBUS DP, Руководство по эксплуатации

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Proline t-mass 65 PROFIBUS DP Maintenance
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7 Maintenance
Generally, the flowmeter requires no special maintenance work, particularly if the gas is clean and
dry.
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 measured variables (mass flow,
corrected volume flow) to zero flow during such cycles. See "Description of Device Functions”
manual for more information.
"
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 metering errors due to contamination or build-ups. The frequency
of inspection and cleaning will depend upon the application and expected measurement
performance. A suitable cleaning agent that does not attack the materials or seals maybe used.
• t-mass F sensor: Removal of the transducer may be carried out subject to the requirements of
Pressure Equipment Directive, CRN approvals, and relevant hazardous area standards. In case of
EX approved versions, the o-ring seals must be replaced at the same time. Please consult your
Hauser service representative.
• t-mass I sensor: Cleaning of this sensor is straight forward - no special limitations.
!
Note!
Use care not to bend the sensing elements of the transducer.
7.4 Replacing seals
t-mass F sensor:
Under normal circumstances, fluid wetted seals of the sensor do not require replacement.
Replacement is necessary only in special circumstances, for example if aggressive or corrosive fluids
are incompatible with the seal material.
t-mass I sensor:
The transducer is welded to the insertion tube and has no exchangeable seals. The compression
fitting contains wetted seals (non exchangeable) and a bonded seal is used on G 1 A threads.
The compression fitting and bonded seal are available as spare parts.
7.5 In-situ calibration
The t-mass flowmeters are designed to support in-situ calibration using a reference meter signal,
thus saving time and cost by reducing the need for factory re-calibration.
Please discuss your specific requirements with your Hauser service representative.