Siemens SITRANS WF100, Operating Instructions Manual, Page: 33 / 45

SITRANS WF100
Operating Instructions, 02/2012, 7ML19985NB01-01
31
Service and maintenance
7
Periodic recalibration
If the flowmeter is properly installed, the zero and span calibrations will require limited attention.
However, to maintain the flowmeter's accuracy, redo the zero and span calibration periodically.
The frequency of recalibration is dependent on the application in which the flowmeter is being
used and the severity of its operating conditions. Perform frequent recalibrations initially and
note the deviations, then reduce the frequency as time and experience dictate.
Refer to the Programming and calibration sections of the integrator manual.
System checks
WARNING
On hazardous approved flowmeters the load cell has an extra protective cover that protects
the electronic circuitry within the cell. Periodically clean the gap between the cover and the
cell to ensure material does not build up and reduce or stop deflection of the sensing plate.
If material sticks to the sensing plate, clean the impingement area regularly. If sticking of the
material persists, contact your Siemens Milltronics representative.
Check for material bridging across the load cell or sensing plate to the housing which can restrict
the movement of either component.
WARNING
Do not strike the flowmeter, its components, or adjacent piping to dislodge material.
Check for wearing of the sensing plate. If wear is excessive contact your Siemens Milltronics
representative.