Siemens SITRANS WF100, Operating Instructions Manual, Page: 29 / 45

SITRANS WF100
Operating Instructions, 02/2012, 7ML19985NB01-01
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Commissioning
6
After all parts of the flowmeter system have been properly installed and connected, the
flowmeter system and integrator must be calibrated. The calibration is done using the test
weight(s) initially, however material tests are recommended to achieve the greatest accuracy.
Refer to the integrator instruction manual for programming and calibration details and for
information about material tests. All operating instructions are available for download from our
website:
Siemens weighing )
Test rate
The test rate is the material flowrate represented by the test weight. The test weight is used to
simulate the horizontal forces of the material hitting the sensing plate.
Calculating the test weight and test rate
Select the test weight to represent a calibration point of 60 to 80% of the design flowrate based
on the flowmeter calibration constant of 45 g/T/H (tons per hour).
Test weight = Design flowrate × Calibration point × Calibration constant
Test rate = Test weight ÷ Calibration constant
Figure 6-1 The calibration constant represents an average of a range of values covering various
material flow arrangements and materials handled by the flowmeter. It is an approximate
value to be used in the calculation of the test rate. Through the running of material tests, the
test rate may be factored to obtain an optimum value which should lie in the range of 50 to
100% of the design rate. The test rate should never exceed 100% of the design rate.