SMC Networks ISE20CH-L, Operation Manual

Page: 68 / 108

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No.PS
※※
-OMX0002
○
Conversion formula of the process data and pressure gauge measurement value
(1) Conversion formula from the process data to the pressure gauge measurement value:
Pr = a × (PD) + b
(2) Conversion formula from the pressure gauge measurement value to the process data:
(PD) = (Pr – b) / a
Pr: Pressure gauge measurement value and pressure set value
PD: Pressure gauge measurement value
a: Inclination
b: Intercept
[Inclination and intercept to the unit specification]
Series Unit Inclination a Intercept b
ISE20C
MPa 0.00025 -0.25
kPa 0.25 -250
kgf/cm
2
0.00254925 -2.54925
bar 0.0025 -2.5
psi 0.03626 -36.26
ZSE20C
MPa -0.000025 0.025
kPa -0.025 25
kgf/cm
2
-0.000254925 0.254925
bar -0.00025 0.25
psi -0.003626 3.626
inchHg -0.0073825 7.3825
mmHg -0.187525 187.525
ZSE20CF
MPa 0.00005 -0.15
kPa 0.05 -150
kgf/cm
2
0.00050985 -1.52955
bar 0.0005 -1.5
psi 0.007252 -21.756
inchHg 0.014765 -44.295
mmHg 0.37505 -1125.15
ISE20CH
MPa 0.0005 -0.5
kPa 0.5 -500
kgf/cm
2
0.0050985 -5.0985
bar 0.005 -5
psi 0.07252 -72.52
[Calculation example]
(1) Conversion from the process data to the pressure measurement value
(For ISE20C series, unit specification MPa and PD = 2000)
Pr = a × (PD) + b
= 0.00025 × 2000 - 0.25
= 0.25 [MPa]
(2) Conversion from the pressure measurement value to the process data
(For ISE20C series, unit specification MPa and Pr = 0.75 [MPa])
(PD) = (Pr – b) / a
= [0.75 – (–0.25)]/0.00025
= 4000