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Engineering Toolbox/3–15 psi Pneumatic Signal

Instrumentation & Calibration

3–15 psi Pneumatic Signal

Convert pneumatic controller or positioner signal pressure to percentage output, or determine the expected 3–15 psi signal for a required percentage.

Calculator

Nominal linear signal: 3 psi = 0%, 15 psi = 100%.

psi

Out-of-range values are accepted for troubleshooting.

%

Field use

Pneumatic loops and valve control.

Useful when checking pneumatic controllers, I/P or P/I interfaces, positioners and control-valve signal conditions.

Calculation basis

% output = ((psi − 3) / 12) × 100
psi = 3 + 12 × (% output / 100)

Applicability: nominal linear 3–15 psi pneumatic signals. This does not diagnose valve action, controller direct/reverse action, positioner calibration or instrument-air quality.

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