SMC Networks PF3A801H-L Operation Manual page 78

○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
Flow rate
Temperature
Pressure
Accumulated flow
[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
Range
L/min
1,000 L/min
L/min
2,000 L/min
o
50 C
1 MPa Kgf/cm
9,999,999,990 L
-77-
Unit Inclination a
0.25
cfm 0.0088275
0.5
cfm 0.0176575
o
C 0.1
o
F 0.18
MPa 0.001
kPa 1
2
0.010197
Bar 0.01
Psi 0.14504
L 10
3
Ft 1
Intercept b
0
0
0
0
0
32
0
0
0
0
0
0
0
No.PF※※-OMY0005