SMC Networks PF3A801H-L - Process Data Conversion Formulas

-77-
No.PF※※-OMY0005
○Conversion formula of the process data and flow/temperature measured value
(1) Conversion formula from the process data to the flow measured value:
Pr = a × (PD) + b
(2) Conversion formula from the flow gauge measured value to the process data:
(PD) = (Pr – b) / a
Pr: Flow measured value and pressure set value
PD: Flow measured value (process data)
a: Inclination
b: Intercept
[Inclination and intercept to the unit specification]
Measured object
Range
Unit
Inclination a
Intercept b
Flow rate
1,000 L/min
L/min
0.25
0
cfm
0.0088275
0
2,000 L/min
L/min
0.5
0
cfm
0.0176575
0
Temperature
50
o
C
o
C
0.1
0
o
F
0.18
32
Pressure
1 MPa
MPa
0.001
0
kPa
1
0
Kgf/cm
2
0.010197
0
Bar
0.01
0
Psi
0.14504
0
Accumulated flow
9,999,999,990 L
L
10
0
Ft
3
1
0
[Calculation example]
(1) Conversion from the process data to the flow measured value
(For PF3A801H series, unit L/min, flow range 1000 L and PD = 2800)
Pr = a × (PD) + b
= 0.25 × 2800 + 0
= 700 [L/min]
(2) Conversion from the flow measured value to the process data
(For PF3A802H series, unit L/min, flow range 2000 L and Pr = 1750 [L/min])
(PD) = (Pr - b) / a
= [1750 - 0] / 0.50
= 3500