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Installation
!
20
3.2.8
Nominal diameter and flow rate
The diameter of the pipe and the flow rate determine the nominal diameter of the sensor. The
optimum flow velocity is between 2 and 3 m/s (6 to 10 ft/s). The flow velocity (v), moreover, has
to be matched to the physical properties of the fluid:
• v < 2 m/s (<6 ft/s): for abrasive fluids where solids do not cause sedimentation (e.g. lime milk)
• v > 2 m/s (>6 ft/s): for fluids producing buildup (e.g. wastewater sludge)
• v > 2 m/s (>6 ft/s): for abrasive sludge with a high sand or stone content and where the solids
easily cause sedimentation (e.g. ore slurry)
Note!
Flow velocity can be increased, if necessary, by reducing the nominal diameter of the sensor through
the use of adapters → Page 19.
Promag S
Flow rate characteristic values - Promag S (SI units)
Nominal diameter
[mm]
15
25
32
40
50
65
80
100
125
150
200
250
300
350
400
450
500
600
Recommended flow rate
min./max. full scale value
(v ≈ 0.3 or 10 m/s)
3
4 to 100 dm
/min
3
9 to 300 dm
/min
3
15 to 500 dm
/min
3
25 to 700 dm
/min
3
35 to 1100 dm
/min
3
60 to 2000 dm
/min
3
90 to 3000 dm
/min
3
145 to 4700 dm
/min
3
220 to 7500 dm
/min
3
20 to 600 m
/h
3
35 to 1100 m
/h
3
55 to 1700 m
/h
3
80 to 2400 m
/h
3
110 to 3300 m
/h
3
140 to 4200 m
/h
3
180 to 5400 m
/h
3
220 to 6600 m
/h
3
310 to 9600 m
/h
Proline Promag 55 PROFIBUS PA
Factory settings
Low flow cut off
(v ≈ 0.04 m/s)
3
0.5 dm
/min
3
1 dm
/min
3
2 dm
/min
3
3 dm
/min
3
5 dm
/min
3
8 dm
/min
3
12 dm
/min
3
20 dm
/min
3
30 dm
/min
3
2.5 m
/h
3
5.0 m
/h
3
7.5 m
/h
3
10 m
/h
3
15 m
/h
3
20 m
/h
3
25 m
/h
3
30 m
/h
3
40 m
/h
Endress+Hauser
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