02.A.003 35
10.5.3. Available pressure ranges acc. to DIN, ANSI for operation of
the flowmeters for the individual versions for DN flanged connections
10.5.4. Basic principles for selection of the DN size (acc. to DIN) of
the flowmeter for the nominal flow Qn
- Electromagnetic flowmeters have the declared measurement class for linear velocity in
the range 0.3 ÷ 10 m/s and simultaneous complete filling of the sensor with liquid and
meeting the requirements for the physical and chemical parameters of the medium
and the environment in the specification of the sensor.
- The basic parameter necessary for selection of the DN size of the flowmeter is
knowledge of expected nominal flow Qn [m3/h, l/s]. DN value of the flowmeter should
be selected so that for nominal flow Qn [m3/h, l/s] the linear velocity of the flow Vn
[m/s] is as close as possible to 3 m/s. Selecting DN size for the flowmeter user should
use the standard values of the flow resulting from the parameter Qmax[m3/h]. Values
of Qmax flow for the individual DN values of the flowmeters are selected for the linear
value of the flow V [m/s] equal to approx. 3 m/s.
- Design of the flowmeter ensures measurement (balancing) in the range of the flows up
to 200% Qmax.
Representation of instantaneous flow value with a current signal 4-20 is limited to range of
flows determined by the MIN value and MAX value parameters (the same unit as set in Flow
unit option) included in the Outputs config subgroup.
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