6
Signet 2540 High Performance Flow Sensor
"H"
alignment rod
sensor flange
process pipe
direction
of flow
pipe side view
Before installing the sensor some critical dimensions must be established (for Hot-Tap installations,
we assume the pipe dimensions are known). The rotor shaft must be located 10% inside the pipe
I.D. to ensure accurate calibration capability. To accomplish this, the "H" dimension is measured
from the outside surface of the pipe to the bottom of the sensor fl ange.
Nominal "H" dimensions for standard pipes are listed here. For non-standard pipe dimensions,
calculate the "H" dimension using the formula listed below. The wall thickness and inside diameter
(I.D.) are required for the "H" dimension calculation.
The 6 inch ruler (included) may be used to measure your pipe I.D. and wall thickness up to 5 inches
(standard sensors only).
Pipe wall thickness: ___________ Pipe I.D.: ___________
A
B
1
2
3
4
5
6
1
2
3
4
5
A
B
1
2
3
4
5
6
1
2
3
4
5
pipe I.D.
wall
thickness
A
B
1
2
3
4
5
6
1
2
3
4
5
incorrect
correct
H Dimensions, Standard Sensors (2540-1, 2540-2)
Wrought Steel Pipe Per ANSI 36.10
NPS
inches
SCH 40
inches
SCH 80
inches
STD
inches
XS
inches
1½
4.924
4.880
4.924
4.880
2
4.869
4.818
4.869
4.818
2½
4.780
4.722
4.780
4.722
3
4.707
4.640
4.707
4.640
3½
4.649
4.576
4.649
4.576
4
4.590
4.510
4.590
4.510
5
4.467
4.374
4.467
4.374
6
4.344
4.222
4.344
4.222
8
4.110
3.968
4.110
3.968
10
3.863
3.680
3.863
3.755
12
3.630
3.405
3.655
3.555
14
3.480
3.230
3.530
3.430
16
3.230
2.955
3.330
3.230
18
2.980
2.680
3.130
3.030
20
2.755
2.405
2.930
2.830
22
-----
2.130
2.730
2.630
24
2.280
1.855
2.530
2.430
Stainless Steel Pipe Per ANSI B36.19
NPS
inches
SCH 5S
inches
SCH 10S
inches
SCH 40S
inches
SCH 80S
inches
1½
4.988
4.953
4.924
4.880
2
4.940
4.905
4.869
4.818
2½
4.876
4.847
4.780
4.722
3
4.814
4.784
4.707
4.640
3½
4.764
4.734
4.649
4.576
4
4.714
4.684
4.590
4.510
5
4.586
4.567
4.467
4.374
6
4.480
4.460
4.344
4.222
8
4.280
4.249
4.110
3.968
10
4.048
4.023
3.863
3.755
12
3.830
3.811
3.655
3.555
14
3.705
3.680
-----
-----
16
3.498
3.480
-----
-----
18
3.298
3.280
-----
-----
20
3.080
3.056
-----
-----
22
2.880
2.856
-----
-----
24
2.656
2.630
-----
-----
Wrought Steel Pipe Per ANSI 36.10
NPS
inches
SCH 40
inches
SCH 80
inches
STD
inches
XS
inches
1 ½
15.084
15.040
15.084
15.040
2
15.029
14.978
15.029
14.978
2 ½
14.940
14.882
14.940
14.882
3
14.867
14.800
14.867
14.800
3½
14.809
14.736
14.809
14.736
4
14.750
14.670
14.750
14.670
5
14.627
14.534
14.627
14.534
6
14.534
14.382
14.534
14.382
8
14.270
14.128
14.270
14.128
10
14.023
13.840
14.023
13.915
12
13.790
13.565
13.815
13.715
14
13.640
13.390
13.690
13.590
16
13.390
13.115
13.490
13.390
18
13.140
12.840
13.290
13.190
20
12.915
12.565
13.090
12.990
22
-----
12.290
12.890
12.790
24
12.440
12.015
12.690
12.590
Stainless Steel Pipe Per ANSI B36.19
NPS
inches
SCH 5S
inches
SCH 10S
inches
SCH 40S
inches
SCH 80S
inches
1 ½
15.148
15.113
15.084
15.040
2
15.101
15.065
15.029
14.978
2 ½
15.036
15.007
14.940
14.882
3
14.974
14.944
14.867
14.800
3 ½
14.924
14.894
14.809
14.736
4
14.874
14.844
14.750
14.670
5
14.747
14.727
14.627
14.534
6
14.640
14.620
14.534
14.382
8
14.440
14.409
14.270
14.128
10
14.208
14.183
14.023
13.915
12
13.990
13.971
13.815
13.715
14
13.865
13.840
-----
-----
16
13.658
13.640
-----
-----
18
13.458
13.440
-----
-----
20
13.240
13.216
-----
-----
22
13.040
13.016
-----
-----
24
12.816
12.790
-----
-----
(-----) unavailable
(-----) unavailable
Standard Sensors:
H = 5.23 - wall thickness - (0.10 x I.D.)
Hot-Tap Sensors:
H=15.39 in. - wall thickness - (0.10 x I.D.)
Example: 3.0 inch schedule 80 wrought steel
Wall thickness = 0.3 in. / Inside diameter = 2.9 in.
H = 5.23 - 0.3 - (0.10 X 2.9) / H = 117.86 mm
(4.64 in.)
Record your sensor's "H" dimension for future
reference:
H= ___________
After correct dimensions are calculated and
recorded, the sensor can be installed in the fi tting.
The Standard and Hot-Tap versions require
substantially diff erent procedures.
H Dimensions, Hot-Tap Sensors (2540-3, 2540-4)
Calculating the H Dimension
