Differential pressure with separate zero corrections calculator

Subtract each channel bias from its reading before differencing. An equal common bias cancels; unequal or opposite-signed channel biases do not.

Units

\mathit{dP}_{\text{true}} = P_{h} - b_{h} - \left(P_{l} - b_{l}\right)

Calculator

Enter the values you know and leave one box empty. Calculate finds the empty one, the result or any input.

Given

\mathit{dP}_{\text{true}} = 4.6 - 0.8 - \left[1.2 - \left(-0.4\right)\right] = 2.2

Symbol	Meaning	Unit
$\mathit{dP}_{\text{true}}$	corrected high-to-low pressure difference	psi
$P_{h}$	measured high-side pressure	psig
$b_{h}$	high-side reading minus true pressure	psi
$P_{l}$	measured low-side pressure	psig
$b_{l}$	low-side reading minus true pressure	psi

Symbol	Meaning	Unit
$\mathit{dP}_{\text{true}}$	corrected high-to-low pressure difference	kPa
$P_{h}$	measured high-side pressure	kPa(g)
$b_{h}$	high-side reading minus true pressure	kPa
$P_{l}$	measured low-side pressure	kPa(g)
$b_{l}$	low-side reading minus true pressure	kPa

Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.