Answer / carl_ellis

Configuring the range for a DP transmitter

Open tank:
- Flanged DP transmitter
- high side at lower flange
- no remote seals:
- units: water column units = uwc
- LRV = 0.00 uwc
- URV = physical upper level elevation (uwc) * specific
gravity of fluid

Closed tank:
- flanged DP transmitter
- high side at lower flange
- no remote seals
- dry leg from vapor space above liquid is piped/connected
to the low side
- LRV = 0.00 uwc
- URV = physical upper level elevation (uwc) * specific
gravity of fluid

When the receiver (DCS/PLC/indicator/recorder) receives the
level signal, it converts to physical level elevation by
dividing the process level signal by the specific gravity
and scaling to physical level units.

Volumetric flow rate with DP transmitter on DP flow element:
- units: water column units = uwc
- LRV = 0.00
- URV = maximum DP value at the maximum flow rate stated
on the sizing sheet of the DP flow element

Whether the signal is square rooted in the transmitter or
in the receiver for conversion to flow rate is up to the
plant convention/standards.

I want to measure level under vaccum by using DP Tx and vaccum vary between -500 to -670 mmHg and process fluid is accetic anhydride if consider process fluid density 1 kg/cm2. how to calibrate Tx ? consider level is 0 to 100 Cm.

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