The Transmitter Lower Range Value (LRV) and Upper Range Value (URV) calculations for a siemens pressure/differential pressure transmitters.
The following figures showing calculation formulae for different measurements like level, separation (interface), and density measurements for both Open & Closed Tanks using Flange Type Pressure/Differential Pressure Transmitters.
In below figures : PMA & PME are nothing but LRV & URV of a transmitter.
Reference : Siemens manual
Calculate mA from PV, LRV, URV
Linear % to Square root % conversion
Closed Tank Level Calculations
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great effort thanks