SMC Networks ZK2-ZS L A Series Operation Manual page 22

○Conversion formula of the process data and pressure measurement value
(1) Conversion formula from the process data to the pressure measurement value:
Pr = a × (PD) + b
(2) Conversion formula from the pressure measurement value to the process data:
(PD) = (Pr – b) / a
Pr: Pressure value
PD: Process data value
a: Gradient
b: Offset
[Gradient and offset to the unit specification]
Unit
MPa
kPa
2
kgf/cm
Bar
Psi
inchHg
mmHg
[Calculation example]
(1) Conversion from the process data to the pressure value
(Unit: kPa, PD = 2000)
Pr = a × (PD) + b
= -0.025 × 2000 + 0
= -50 [kPa]
(2) Conversion from the pressure value to the process data
(Unit: kPa, Pr = -75.0[kPa])
(PD) = (Pr - b) / a
= (-75.0 – 0) / -0.025
= 3000
Gradient a Offset b
-0.000025 0
-0.025 0
-0.000255 0
-0.000250 0
-0.003625 0
-0.007375 0
-0.1875 0
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Doc. No. DOC1051887