YOKOGAWA AE100D, Инструкция по эксплуатации

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IM 1F6A0-01E 2-12
2. GENERAL DESCRIPTION
■
Calculation formula
■
How to calculate volume flow rate at operating
conditions.
• Qf = or Qf = 3600
× υ ×
S
■
How to calculate the velocity of a Reynolds number.
• = 5 / D (Reynolds number of 5000)
• = 20 / D (Reynolds number of 20000)
• = 40 / D (Reynolds number of 40000)
however
• Re =
• = 10
3
Qf : Volume flow rate at operating conditions (m 3 /h)
D : Inner diameter of YEWFLO (mm)
S : Sectional area of YEWFLO (m
2 )
υ
: Flow velocity (m/s)
Re : Reynolds number (none unit)
pf : Density at operating conditions (kg/m 3 )
µ
: Viscosity at operating conditions (cP)
: Kinematic viscosity at operating conditions (10 -6 m 2 /s{cSt})
Table 2.5.5 Inner Diameter and Nominal value
T020505.EPS
Nominal Size
Inner
Diameter
mm
Nominal
K-Factor
Pulse/L
mm inch
Nominal Pulse Rate
Hz/m/s Hz/m 3 /h
15
25
40
50
80
100
150
200
250
300
1/2
1
1-1/2
2
3
4
6
8
10
12
14.6
25.7
39.7
51.1
71.0
93.8
138.8
185.6
230.8
276.2
376
65.6
18.7
8.95
3.33
1.43
0.441
0.185
0.0966
0.0563
62.7
35.5
23.1
18.3
13.2
9.88
6.67
5.00
4.04
3.37
104
19.1
5.19
2.49
0.925
0.397
0.123
0.0514
0.0268
0.0156
■
Typical fluid example
Table 2.5.6 Range of Measurable Water Flow Rate
(At standard condition of 15
°
C,
ρ
= 1000 kg/m
3
)
Nominal Size
mm inch
Range of Guarranted
Accuracy Flow
Rate in m 3 /h
Measurable Flow Rate
in m 3 /h
15
25
40
50
80
100
150
200
250
300
1/2
1
1-1/2
2
3
4
6
8
10
12
0.30 up to 6
0.65 up to 18
1.3 up to 44
2.2 up to 73
4.3 up to 142
7.5 up to 248
17 up to 544
34 up to 973
60 up to 1506
86 up to 2156
0.94 up to 6
1.7 up to 18
2.6 up to 44
3.3 up to 73
4.6 up to 142
7.5 up to 248
18 up to 544
34 up to 973
60 up to 1506
86 up to 2156
T020506.EPS
■
Guaranteed accuracy at minimum flow velocity
Table 2.5.3 Range of Guaranteed Accuracy Flow Velocity
Fluid
Liquid
Gas,
Steam
Nominal
Size
15 mm
up to
100 mm
150 mm
up to
300 mm
15 mm
up to
100 mm
150 mm
up to
300 mm
Maximum
flow
velocity
10 m/s
80 m/s
Minimum flow velocity
"flow velocity obtained from Table.2.5.1"
or " flow velocity at Reynolds number of
20000", whichever is greater.
For liquid Reynolds number of 20000 :
The value is four times velocity value in
Figure.2.5.1
"flow velocity obtained from Table.2.5.1"
or " flow velocity at Reynolds number of
40000", whichever is greater.
For liquid Reynolds number of 40000 :
The value is eight times velocity value in
Figure.2.5.1
"flow velocity obtained from Table.2.5.1"
or " flow velocity at Reynolds number of
20000", whichever is greater.
For gas and steam Reynolds number of
20000 : Use of a calculation formula
"flow velocity obtained from Table.2.5.1"
or " flow velocity at Reynolds number of
40000”, whichever is greater.
For gas and steam Reynolds number of
40000 : Use of a calculation formula
T020503.EPS
Table 2.5.4 Detailed Accuracy
(for Range of Guaranteed Accuracy)
D : Inner diameter of YEWFLO (mm)
Re: Reynolds number (non unit)
Note: This table shows the accuracy of pulse output. In case of analog
output, add up
±
0.1% of full scale to the values mentioned
above.
Fluid
Liquid
Gas,
Steam
Nominal Size
15mm
25 mm up to
100 mm
150 mm up
to 300 mm
15 mm up to
300 mm
Accuracy
±
1.0% of Reading (20000 Re)
±
1.0% of Reading (20000 Re < D
×
10
3
)
±
0.75% of Reading (D
×
10
3
Re )
±
1.0% of Reading (40000 Re)
±
1.0% of Reading (Velocity 35m/s or less)
±
1.5% of Reading (Velocity 35m/s up to 80m/s)
T020504.EPS
■
Flow velocity at Reynolds Number of
5000(Liquld)
Kinematic Viscosity : Use of equation(2). When the nominal size is
50mm and the Kinematic viscosity is 10cSt, the flow velocity at
Reynolds number of 5000 is 1m/s using Figure 6.
1 2
15mm 25mm 40mm 50mm 100mm 150mm
200mm
250mm
300mm
80mm
3 5 20 10 30 300 200 100 50
10
0.3
0.5
1
2
3
5
Kinematic Viscosity (10 -6 m 2 /S{cSt})
Flow Velocity
υ
(m/s)
υ
= 5 X
D: YEWFLO internal
diameter (mm)
D
F020501.EPS
Figure 2.5.1 Flow velocity at Reynolds number of 5000(Liquid)
υ
D 2
354
········· (1)
D
354 10
3
Qf
················· (2)
ρ
f