Type S030

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6.2. Selection of the nominal diameter

The following graph is used to determine the appropriate DN of the pipe and fitting for the application, according to the fluid velocity and

the flow rate. On the chart, the intersection of flow velocity and flow rate gives the appropriate diameter.

Note:

• For the fittings listed below, the corresponding nominal size in the bracket must be used:

– External threads acc. to SMS 1145

– Weld ends acc. to SMS 3008, BS4825-1/ASME BPE/DIN 11866 series C or DIN 11850 series 2/DIN 11866 series A/

DIN EN 10357 series A

– Clamp acc. to SMS 3017, BS 4825-3/ASME BPE or DIN 32676 series A.

• For all other fittings, the corresponding nominal diameter without bracket applies.

Example 1:

• nominal flow: 10 m3/h

• optimal flow rate: 2…3 m/s

Result: Select a pipe size of DN 40

Example 2 with external threads according to SMS

1145:

• nominal flow: 10 m3/h

• optimal flow rate: 2…3 m/s

Result: Select a pipe size of DN 50

0.1

0.3

0.5

1

3

5

10

0.01

0.02

0.05

0.1

0.2

0.5

1

2

5

10

20

50

100

200

m3/h

0.2

0.5

1

2

5

10

20

50

100

200

500

1000

2000

3000

l/min

0.3

0.5

1

3

5

10

30

m/s

fps

gpm

0.05

0.1

0.2

0.5

1

2

5

10

20

50

100

200

500

1000

DN65

DN50 (DN65)1.)

DN40 (DN50)1.)

DN32 (DN40)1.)

DN25 (DN32)1.)

DN20 (DN25)1.)

DN15 (DN15

or DN20)1.)

DN08

DN06

S030-HT

Flow velocity

Diameter of example 1 and example 2

Not recommended

S030 (standard)

Optimal flow rate

1.) See note at the beginning of this chapter.

7.

Product operation

7.1. Measuring principle

When liquid flows through the pipe, the paddle wheel with 4 inserted magnets is set in rotation producing a frequency signal in the

transducer (Hall sensor) of the mounted transmitter. The rotation is detected contactless through the sensor-fitting wall. The frequency mod-

ulated induced voltage is proportional to the flow velocity of the fluid.