2011 NEW PRODUCTS
Please be sure to read before handling the product. Please refer to "safety instructions", "common safety instructions for products listed in this manual", "common safety instructions for flow controller" from page 24 through 35.
P
2
：
Vacuum
P
1
：
Atmospheric pressure Suction nozzle
P
1
：
Pressurize
P
2
：
Atmospheric pressure
P
1
：
Pressurize
P
2
：
Atmospheric pressure
Pin hole
22
■
How to select flow sensor
The following is a guide to select the flow range when using a flow sensor to verify suction and release by suction nozzle, leakage tests, and etc.
The flow is calculated by the effective sectional area of nozzle (pin hole), and the pressure difference inside and outside of the nozzle.
P
1
≧
1.89P
2
(sonic flow)
Q
＝
113.2
×
S
×
P
1
P
1
＜
1.89P
2
(subsonic flow)
Q
＝
226.4
×
S
×
P
2
（
P
1
−
P
2
）
Q
：
Flow rate
ℓ
/min
P
1
：
Absolute primary pressure
MPa
P
2
：
Absolute secondary pressure
MPa
S
：
Nozzle (pin hole) effective sectional area
mm
2
●
Calculation example
The following table gives the calculated flow rate when using nozzle diameter ø0.1 to 2 with variable P2.
P
1
（
MPa
）
Abs. press.
P
1
（
MPa
）
Gauge press.
P
2
（
MPa
）
Abs. press.
P
2
（
MPa
）
Gauge press. Sonic/subsonic
Calculated flow rate (
ℓ
/min)
φ
0.1
φ
0.2
φ
0.3
φ
0.4
φ
0.5
φ
0.7
φ
1
φ
1.5
φ
2
0.1013
0
0.0313
-0.07
Sonic
0.090
0.360
0.810
1.440
2.250
4.411
9.002
20.254
36.007
0.1013
0
0.0413
-0.06
Sonic
0.090
0.360
0.810
1.440
2.250
4.411
9.002
20.254
36.007
0.1013
0
0.0513
-0.05
Sonic
0.090
0.360
0.810
1.440
2.250
4.411
9.002
20.254
36.007
0.1013
0
0.0613
-0.04
Subsonic
0.088
0.352
0.792
1.408
2.200
4.312
8.800
19.801
35.202
0.1013
0
0.0713
-0.03
Subsonic
0.082
0.329
0.740
1.315
2.055
4.028
8.220
18.494
32.878
0.1013
0
0.0813
-0.02
Subsonic
0.072
0.287
0.645
1.147
1.792
3.512
7.166
16.125
28.666
0.1013
0
0.0913
-0.01
Subsonic
0.054
0.215
0.483
0.859
1.343
2.631
5.370
12.083
21.480
0.1113
0.01
0.1013
0
Subsonic
0.057
0.226
0.509
0.905
1.414
2.772
5.657
12.727
22.626
0.1213
0.02
0.1013
0
Subsonic
0.080
0.320
0.720
1.280
2.000
3.920
8.000
17.999
31.998
0.1413
0.04
0.1013
0
Subsonic
0.113
0.453
1.018
1.810
2.828
5.543
11.313
25.454
45.252
0.1613
0.06
0.1013
0
Subsonic
0.139
0.554
1.247
2.217
3.464
6.789
13.856
31.175
55.423
0.1813
0.08
0.1013
0
Subsonic
0.160
0.640
1.440
2.560
4.000
7.840
15.999
35.998
63.996
0.2013
0.1
0.1013
0
Sonic
0.179
0.716
1.610
2.862
4.472
8.765
17.888
40.248
71.552
0.3013
0.2
0.1013
0
Sonic
0.268
1.071
2.410
4.284
6.694
13.119
26.774
60.242 107.096
0.4013
0.3
0.1013
0
Sonic
0.357
1.426
3.209
5.706
8.915
17.474
35.660
80.236 142.641
0.5013
0.4
0.1013
0
Sonic
0.445
1.782
4.009
7.127
11.137
21.828
44.547 100.230 178.186
0.6013
0.5
0.1013
0
Sonic
0.534
2.137
4.809
8.549
13.358
26.182
53.433 120.224 213.731
(caution)
・
If there is leakage in piping, etc., the actual flow will be larger than the calculated value. Please take such pipe leakage into account when
selecting the flow rate.
・
If there is a section narrower than the suction nozzle diameter in piping, the flow will be restricted, and may be less than the calculated value.
It may not be possible to check suction, etc.
・
The effective sectional area is a guideline. If the nozzle is long and thin, the effective sectional area will be smaller than the nozzle's opening.
・
The response speed is determined and depended by the piping inner volume between the flow sensor and the suction nozzle (pin hole).
Desiring a high-speed detection, please set the flow sensor near the suction nozzle, or reduce the inner volume as much as possible.
Suction
Blow (leakage inspection)