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Promag 31
6.4 Nominal diameter and flow rate
As a rule the pipe diameter governs the nominal diameter of the sensor. When the
volume flow is known, it is possible to estimate from the table below whether the
optimal velocity range of 2...3 m/s can be adhered to.
The flow velocity (v) also has to matched to the physical properties of the medium:
• v < 2 m/s: with abrasive media (potter's clay, lime milk, or slurry)
• v > 2 m/s: with media forming a coating (waste-water sludge, etc.)
If it is necessary to increase the flow velocity, this can be done by reducing the
nominal diameter of the sensor.
The table below summarizes the minimum and maximum full-scale values (incl. works
setting) which can be set by miniature switches in Promag 31.
DN
[mm]
Q
n (min)
15
0.8
25
2.2
32
3.6
40
5.6
50
9.0
65
15
80
*15
100
18
125
28
150
40
200
70
250
110
300
160
350
215
400
280
500
440
600
640
Q
with reference to Q
n (min)
Q
with reference to v = 5 m/s
n (max)
* = Limit range Q ≥15 m
3
/h
Diameters DN 800...DN 2000 are also approved.
Measuring points with these diameters are however normally not approved
for cold water fiscal metering (Q
Endress+Hauser
Metrological Classes
3
A [m
/h]
Q
n (max)
3
8.8
15
22
35
60
90
140
220
220
550
880
1250
1700
2200
3500
5000
(v = 0.05 m/s)
min
3
>2000 m
/h).
max
3
B [m
/h]
Q
Q
n (min)
n (max)
1.6
4.4
7.2
11.3
*15
20
30
46
140
73
220
105
220
190
550
290
880
420
1250
570
1700
750
2200
1170
3500
1700
5000
6. Technical Data
3
8.8
15
22
35
60
90
53
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