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-63-
No.PS
※※
-OMV0004-C
○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
ISE70
MPa
0.00025
-0.25
kPa
0.25
-250
kgf/cm
2
0.002549
-2.549
bar
0.0025
-2.5
psi
0.03626
-36.26
ISE71
MPa
0.0004
-0.4
kPa
0.4
-400
kgf/cm
2
0.004079
-4.079
bar
0.004
-4
psi
0.05802
-58.02
[Calculation example]
(1) Conversion from the process data to the pressure measurement value
(For ISE70 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 ISE70 series, unit specification MPa and Pr = 0.75 [MPa])
(PD) = (Pr
– b) / a
= [0.75
– (–0.25)]/0.00025
= 4000