AV-MPS
Date of Issue: 10/10/2012
Issue Number: 5.8
Page 1 of 4
AV-MPS
S/S Multi-Point Air Velocity Probes
Features:



Benefits:
316 Stainless steel
Push-on connectors to suit 6mm i/d PVC
tubing
Neoprene rubber gaskets duct seals
included



Averages across the duct
Easy installation
Fully compatible with the PA-500,
PA-267 & PA-699 range of pressure
transmitters
Technical Overview
The AV-MPS series of air velocity probes are available in lengths from 700 to 2000mm (27.56 to 78.74”), and
come in pairs. The AV-MPS is for use in larger ducts or where turbulent airflow is likely to be encountered.
When connected to a differential pressure sensor of an appropriate range. (See table on page 4). The output of
the sensor represents the air velocity, and is defined by the following equation:Velocity² = 2 * Velocity pressure
1.2
This calculation should be performed in a controller’s strategy, to give air velocity in m/s.
Tel: +44 (0) 1732 861200. - E-mail: sales@sontay.com. - Web: www.sontay.com.
© 2012 Sontay Limited. All rights reserved
AV-MPS
Date of Issue: 10/10/2012
Issue Number: 5.8
Page 2 of 4
Specification:
Part Codes:
Probe:
Material
Dimensions
Connectors:
Material
Connections
Duct flange:
Material
Dimensions
Country of origin
316 Stainless steel
26mm dia. (1.02”)
Plated brass
To suit 6mm (0.24”) i/d PVC
tubing
Stainless steel
52mm dia. (2.05”)
UK
AV-MPS700
Suit duct size of 600-700mm (23.62-27.56”)
AV-MPS800
Suit duct size of 700-800mm (27.56-31.50”)
AV-MPS1000
Suit duct size of 750-1000mm (31.50-39.37”)
AV-MPS1250
Suit duct size of 1000-1250mm (39.37-49.21”)
AV-MPS1500
Suit duct size of 1250-1500mm (49.21-59.06”)
AV-MPS1750
Suit duct size of 1500-1750mm (59.06-68.90”)
AV-MPS2000
Suit duct size of 1750-2000mm (68.90-78.74”)
Accessory
PA-TUBE-8MM
PVC Tube 8mm (0.31”) o/d x 1.5mm (0.06”)
wall, 30m (98.5 ft) reel
Tel: +44 (0) 1732 861200. - E-mail: sales@sontay.com. - Web: www.sontay.com.
© 2012 Sontay Limited. All rights reserved
AV-MPS
Date of Issue: 10/10/2012
Issue Number: 5.8
Page 3 of 4
Installation:

The ductwork needs to be straight for at least 2m (6.56’) either side of the probes, where possible.

The ductwork needs to be a consistent diameter or sectional area for at least 2m (6.56’) either side of the probes,
where possible.

Do not install near dampers.

Do not install where condensation is likely (it can block the probe holes).

Ensure that when the probes are mounted that ALL the holes are either inside the duct or blocked up.

One probe should be fixed with the holes pointing directly into the airflow, the other probe can be rotated to
achieve the correct reading (via a D.P. sensor) when compared to a reference probe used for commissioning.

All the above is to try to ensure that the probes are sited in laminar airflow rather than turbulent airflow, to achieve
maximum accuracy and repeatability.

If the probes are to be installed in a round duct mount them side-by-side approx. 100mm (3.94”) apart. If the
probes are to be mounted near a bend or branch in the duct mount them above each other approx. 100mm
(3.94”) apart. Using a flange as a template, mark the duct work and drill the mounting holes.
1.
Turn the total pressure probe so that the holes face directly into the air flow. Lock in position using the pan-head
screws on the flanges.
2.
If possible, adjust the speed of the fan to give a known air velocity. Turn the static pressure probe so that a
differential pressure corresponding to the known air velocity is measured across the 2 probes. Lock in position using
the pan-head screws on the flanges.
3.
Where fan speed adjustment is not possible, measure the air velocity with a vane anemometer (or similar). Turn the
static pressure probe so that a differential pressure corresponding to the measured air velocity is measured across
the 2 probes. Lock in position using the pan-head grub screw.
Static pressure probe
Lo
Air D.P
transmitter
Hi
Direction of air flow
Tel: +44 (0) 1732 861200. - E-mail: sales@sontay.com. - Web: www.sontay.com.
© 2012 Sontay Limited. All rights reserved
AV-MPS
Date of Issue: 10/10/2012
Issue Number: 5.8
Page 4 of 4
Velocity (m/s)
Air Velocity v Differential Pressure Chart:
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
0
0.00
0.60
2.40
5.40
9.60
15.00
21.60
29.40
38.40
48.60
60.00
72.60
86.40
101.40
117.60
135.00
153.60
173.40
194.40
216.60
240.00
264.60
290.40
317.40
345.60
375.00
405.60
437.40
470.40
504.60
540.00
576.60
614.40
653.40
693.60
735.00
777.60
821.40
866.40
912.60
960.00
0.1
0.01
0.73
2.65
5.77
10.09
15.61
22.33
30.25
39.37
49.69
61.21
73.93
87.85
102.97
119.29
136.81
155.53
175.45
196.57
218.89
242.41
267.13
293.05
320.17
348.49
378.01
408.73
440.65
473.77
508.09
543.61
580.33
618.25
657.37
697.69
739.21
781.93
825.85
870.97
917.29
964.81
0.2
0.02
0.86
2.90
6.14
10.58
16.22
23.06
31.10
40.34
50.78
62.42
75.26
89.30
104.54
120.98
138.62
157.46
177.50
198.74
221.18
244.82
269.66
295.70
322.94
351.38
381.02
411.86
443.90
477.14
511.58
547.22
584.06
622.10
661.34
701.78
743.42
786.26
830.30
875.54
921.98
969.62
0.3
0.05
1.01
3.17
6.53
11.09
16.85
23.81
31.97
41.33
51.89
63.65
76.61
90.77
106.13
122.69
140.45
159.41
179.57
200.93
223.49
247.25
272.21
298.37
325.73
354.29
384.05
415.01
447.17
480.53
515.09
550.85
587.81
625.97
665.33
705.89
747.65
790.61
834.77
880.13
926.69
974.45
Velocity
0.4
0.10
1.18
3.46
6.94
11.62
17.50
24.58
32.86
42.34
53.02
64.90
77.98
92.26
107.74
124.42
142.30
161.38
181.66
203.14
225.82
249.70
274.78
301.06
328.54
357.22
387.10
418.18
450.46
483.94
518.62
554.50
591.58
629.86
669.34
710.02
751.90
794.98
839.26
884.74
931.42
979.30
(m/s)
0.5
0.15
1.35
3.75
7.35
12.15
18.15
25.35
33.75
43.35
54.15
66.15
79.35
93.75
109.35
126.15
144.15
163.35
183.75
205.35
228.15
252.15
277.35
303.75
331.35
360.15
390.15
421.35
453.75
487.35
522.15
558.15
595.35
633.75
673.35
714.15
756.15
799.35
843.75
889.35
936.15
984.15
0.6
0.22
1.54
4.06
7.78
12.70
18.82
26.14
34.66
44.38
55.30
67.42
80.74
95.26
110.98
127.90
146.02
165.34
185.86
207.58
230.50
254.62
279.94
306.46
334.18
363.10
393.22
424.54
457.06
490.78
525.70
561.82
599.14
637.66
677.38
718.30
760.42
803.74
848.26
893.98
940.90
989.02
0.7
0.29
1.73
4.37
8.21
13.25
19.49
26.93
35.57
45.41
56.45
68.69
82.13
96.77
112.61
129.65
147.89
167.33
187.97
209.81
232.85
257.09
282.53
309.17
337.01
366.05
396.29
427.73
460.37
494.21
529.25
565.49
602.93
641.57
681.41
722.45
764.69
808.13
852.77
898.61
945.65
993.89
0.8
0.38
1.94
4.70
8.66
13.82
20.18
27.74
36.50
46.46
57.62
69.98
83.54
98.30
114.26
131.42
149.78
169.34
190.10
212.06
235.22
259.58
285.14
311.90
339.86
369.02
399.38
430.94
463.70
497.66
532.82
569.18
606.74
645.50
685.46
726.62
768.98
812.54
857.30
903.26
950.42
998.78
0.9
0.49
2.17
5.05
9.13
14.41
20.89
28.57
37.45
47.53
58.81
71.29
84.97
99.85
115.93
133.21
151.69
171.37
192.25
214.33
237.61
262.09
287.77
314.65
342.73
372.01
402.49
434.17
467.05
501.13
536.41
572.89
610.57
649.45
689.53
730.81
773.29
816.97
861.85
907.93
955.21
1003.69
Using the chart to determine the range of the differential pressure sensor:
From the left hand column (velocity, in 1 m/s increments) and the top row (velocity, in 0.1 m/s increments), read across and
down to find the corresponding differential pressure.
Example:
Air velocity is 6.2m/s - Read across from the left to 0.2m/s and down from the top to 6m/s. Where the column and row meet
gives a differential pressure of 23.06Pa.
Therefore a differential pressure sensor, with a range of 0 - 25Pa would be selected.
Whilst every effort has been made to ensure the accuracy of this specification, Sontay cannot accept responsibility for damage, injury,
loss or expense from errors or omissions. In the interest of technical improvement, this specification may be altered without notice.
Tel: +44 (0) 1732 861200. - E-mail: sales@sontay.com. - Web: www.sontay.com.
© 2012 Sontay Limited. All rights reserved