Siemens SITRANS P - Volume and Mass Flow Measurements

9.2.4.3 Volume and mass flow measurements
The following characteristic curves are available for volume and mass flow measurements:
● Hold at 0, square root (VSOFF
, for volume or MSOFF, for mass flow)
The loop current is 4 mA up to the application point (low flow cut-off (Page 132)). Starting
from the application point, scaling occurs according to the square root:
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EDU
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Y Loop current or flow
X Set measuring span
● Linear, square root
(VSLN, for volume or MSLN, formass flow)
The loop current has a linear relationship with the differential pressure up to the application
point (Page 119). Starting from the application point, scaling occurs according to the square
root:
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EDU
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Y Loop current or flow
X Set measuring span
Parameter assignment
9.2 Parameter assignment over device with display
SITRANS P320/P420 with 4 to 20 mA/HART
Operating Instructions, 11/2019, A5E44852162-AC 115