Endress+Hauser Proline Promag 51, Руководство по эксплуатации

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Proline Promag 51 3 Installation
Hauser 23
3.2.7 Nominal flow rate (Metrological classes)
The diameter of the pipe usually governs the nominal diameter of the sensor. The plant should be
designed so that under “normal” operating conditions, the optimum flow rate lies between
2...3 m/s.
If it is necessary to increase the flow velocity, this can be done by reducing the nominal diameter of
the sensor (see Section 3.2.6).
Please indicate the following data in all requests and orders for certified devices:
Nominal flow rate (Qn) for Class A or B
This information is shown on the nameplate and must be given in the order text. Q
n
must lie
between the corresponding Q
n
(min) and Q
n
(max) valid for Class A or B.
Current output / pulse output
For scaling the current output, the scale value and if required the pulse output value must be given,
and will then set at the factory.
The full scale value and the value Q
n
are two different values. For example, the full scale value
can be higher than the defined Q
n
. In extreme cases, it is double the value of Q
n
(max) and lies
at 10 m/s.
Nominal flow rate Q
n
in [m
3
/h]
Nominal
Diameter DN
Metrological class
A
Metrological class
B
[mm] Qn (min) Qn (max) Qn (min) Qn (max)
15 0.8
Q
mi
n
: Q
n
= 1 :
2
5
3.0 1.6
Q
mi
n
:
Q
n
=
1 : 50
3.0
25 2.2 8.8 4.4 8.8
32 3.6 14.0 7.2 14.0
40 5.6 22.6 11.3 22.6
50 9.0 35.0 15.0 *
Q
mi
n
:
Q
n
=
1 :
3
3
35.0
65 15.0 60.0 20.0 60.0
80 15.0 *
Q
mi
n
:
Q
n
=
1 :
1
2
.5
90.0 30.0 90.0
100 18.0 140.0 46.0 140.0
125 28.0 220.0 73.0 220.0
150 40.0 320.0 105.0 320.0
200 70.0 550.0 190.0 550.0
250 110.0 880.0 290.0 880.0
300 160.0 1250 420.0 1250
350 215.0 1700 570.0 1700
400 280.0 2200 750.0 2200
500 440.0 3000 1170 3000
600 640.0 3000 1700 3000
700...2000
Diameters DN 700...2000 can also be approved.
However, measuring points with these diameters are not normally subject to metrological regulations
(Qmax = 2 x Qn > 2000 m
3
/h).
* Limit range Q
≥
15 m
3
/h (see also Table on Page 74)
Qn (min) = lowest nominal flow rate with reference to Q (min), v = 0.5 m/s
Qn (max) = highest nominal flow rate with reference to Q (max), v = 5 m/s
Designations
→
Page 74