SMC Networks ISE70G L2 Series Operation Manual page 67

○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
ISE70G
ISE75G
ISE76G
ISE77G
ISE78G
[Calculation example]
(1) Conversion from the process data to the pressure measurement value
(For ISE70G 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 ISE70G series, unit specification MPa and Pr = 0.75 [MPa])
(PD) = (Pr – b) / a
= [0.75 – (–0.25)]/0.00025
= 4000
Unit Inclination a
MPa 0.00025
kPa 0.25
2
kgf/cm 0.002549
bar 0.0025
psi 0.03626
MPa 0.0005
kPa 0.5
2
kgf/cm 0.0050985
bar 0.005
psi 0.07252
MPa 0.00125
2
kgf/cm 0.0127475
bar 0.0125
psi 0.1813
MPa 0.0025
2
kgf/cm 0.0254925
bar 0.025
psi 0.3626
MPa 0.004
2
kgf/cm 0.0407875
bar 0.04
psi 0.58015
Intercept b
-0.25
-250
-2.549
-2.5
-36.26
-0.5
-500
-5.0985
-5
-72.52
-1.25
-12.7475
-12.5
-181.3
-2.5
-25.4925
-25
-362.6
-4
-40.7875
-40
-580.15
-66-
No.PS※※-OMV0009-F