Endress+Hauser promag 30 - Page 38

For each nominal diameter is a choice of eight pulse values (in decadic steps).
A definite frequency value (f
max
= 400 Hz at v = 10 m/s, pulse width = 1 ms) is only
available for a single switch position.
Example:
A maximum permissible pulse frequency f
max
= 20 Hz (input frequency of electronic
counter) should not be exceeded. The nominal diameter is assumed to be 25 mm; the
rate of flow Q = 10.8 m
3
/h
Pulse value =
Q
=
10.8 m
3
/h
=
3 dm
3
/s
= 0.15 dm
3
f
max
20 s
-1
20 s
-1
At DN 25 select the switch position for the next higher pulse value ⇒ 1 dm
3
per pulse.
Conversely, when the flow rate Q is known and a pulse value has been selected, the
exact pulse frequency can be calculated.
Table
A
Pulse value
⇒
SI units [dm
3
/pulse, m
3
/pulse]
Switch No. 5, 6 and 7
DN
[mm]
2
4
8
15
25
32
40
50
65
80
100
125
150
200
250
300
350
400
450
500
600
700
800
900
1000
1200
1400
1600
1800
2000
0.0001 dm
3
0.001 dm
3
0.01 dm
3
0.01 dm
3
0.1 dm
3
0.1 dm
3
0.1 dm
3
0.1 dm
3
0.1 dm
3
1dm
3
1dm
3
1dm
3
1dm
3
1dm
3
10 dm
3
10 dm
3
10 dm
3
10 dm
3
10 dm
3
10 dm
3
10 dm
3
100 dm
3
100 dm
3
100 dm
3
100 dm
3
100 dm
3
100 dm
3
100 dm
3
100 dm
3
100 dm
3
0.001 dm
3
0.01 dm
3
0.1 dm
3
0.1 dm
3
1dm
3
1dm
3
1dm
3
1dm
3
1dm
3
10 dm
3
10 dm
3
10 dm
3
10 dm
3
10 dm
3
100 dm
3
100 dm
3
100 dm
3
100 dm
3
100 dm
3
100 dm
3
100 m
3
1m
3
1m
3
1m
3
1m
3
1m
3
1m
3
1m
3
1m
3
1m
3
0.01 dm
3
0.1 dm
3
1dm
3
1dm
3
10 dm
3
10 dm
3
10 dm
3
10 dm
3
10 dm
3
100 dm
3
100 dm
3
100 dm
3
100 dm
3
100 dm
3
1m
3
1m
3
1m
3
1m
3
1m
3
1m
3
1m
3
10 m
3
10 m
3
10 m
3
10 m
3
10 m
3
10 m
3
10 m
3
10 m
3
10 m
3
0.1 dm
3
1dm
3
10 dm
3
10 dm
3
100 dm
3
100 dm
3
100 dm
3
100 dm
3
100 dm
3
1m
3
1m
3
1m
3
1m
3
1m
3
10 m
3
10 m
3
10 m
3
10 m
3
10 m
3
10 m
3
10 m
3
100 m
3
100 m
3
100 m
3
100 m
3
100 m
3
100 m
3
100 m
3
100 m
3
100 m
3
1dm3
10 dm
3
100 dm
3
100 dm
3
1m
3
1m
3
1m
3
1m
3
1m
3
10 m
3
10 m
3
10 m
3
10 m
3
10 m
3
100 m
3
100 m
3
100 m
3
100 m
3
100 m
3
100 m
3
100 m
3
1000 m
3
1000 m
3
1000 m
3
1000 m
3
1000 m
3
1000 m
3
1000 m
3
1000 m
3
1000 m
3
10 dm3
100 dm
3
1m
3
1m
3
10 m
3
10 m
3
10 m
3
10 m
3
10 m
3
100 m
3
100 m
3
100 m
3
100 m
3
100 m
3
1000 m
3
1000 m
3
1000 m
3
1000 m
3
1000 m
3
1000 m
3
1000 m
3
10000 m
3
10000 m
3
10000 m
3
10000 m
3
10000 m
3
10000 m
3
10000 m
3
10000 m
3
10000 m
3
100 dm3
1m
3
10 m
3
10 m
3
100 m
3
100 m
3
100 m
3
100 m
3
100 m
3
1000 m
3
1000 m
3
1000 m
3
1000 m
3
1000 m
3
10000 m
3
10000 m
3
10000 m
3
10000 m
3
10000 m
3
10000 m
3
10000 m
3
100000 m
3
100000 m
3
100000 m
3
100000 m
3
100000 m
3
100000 m
3
100000 m
3
100000 m
3
100000 m
3
0.000079 dm3
0.000314 dm
3
0.001257 dm
3
0.004418 dm
3
0.012272 dm
3
0.020106 dm
3
0.031416 dm
3
0.049087 dm
3
0.082958 dm
3
0.125664 dm
3
0.196350 dm
3
0.306796 dm
3
0.441786 dm
3
0.785398 dm
3
1.22718 dm
3
1.76715 dm
3
2.40528 dm
3
3.14159 dm
3
3.97608 dm
3
4.90874 dm
3
7.06858 dm
3
9.62113 dm
3
12.5664 dm
3
15.9043 dm
3
19.6350 dm
3
28.2743 dm
3
38.4845 dm
3
50.2655 dm
3
63.6173 dm
3
78.5398 dm
3
Caution!
Work with this table only when you have turned switch No. 3 to “OFF” (SI units).
For switching position "ON-ON-ON", set values may differ fron those shown in the table. In such cases, the valid value may be read
from the service plate in the electronics compartment cover. Also, the pulse duty cycle of 1:1 can deviate.
(f
max
= 400 Hz
at v = 10 m/s)
5. Operation and Commissioning Promag 30
38 Endress+Hauser