DP Flow Transmitter Calculator

Calculate flow, flow percentage and 4–20 mA output from differential pressure using the square-root relationship.

Maximum Differential Pressure

DP corresponding to the maximum designed flow

Measured Differential Pressure

inH₂O

Current differential pressure measured by the transmitter

Maximum Flow

Flow corresponding to 100% DP range

Square-Root Extraction Select where the square-root calculation is performed

Low-Flow Cutoff

% Flow

Set to zero if no low-flow cutoff is required

DP Percentage —

Flow Percentage —

Calculated Flow —

Transmitter Output —

DCS Flow Indication —

Linear DP Equivalent —

DP and Flow Relationship

DP Input	Flow	Square-Root Output	Linear DP Output
0%	0%	4.00 mA	4.00 mA
1%	10%	5.60 mA	4.16 mA
4%	20%	7.20 mA	4.64 mA
9%	30%	8.80 mA	5.44 mA
25%	50%	12.00 mA	8.00 mA
49%	70%	15.20 mA	11.84 mA
81%	90%	18.40 mA	16.96 mA
100%	100%	20.00 mA	20.00 mA