5. Operation and Commissioning
5.1 Instrument Functions
With Promag 30, various instrument functions can be activated or deactivated using
miniature switches (see page 37). Explanations on individual instrument functions are
given on the following pages.
➤
Creep suppression
Works setting: Switched on
Switch No. 1: ON
Creep suppression prevents
“false flow” in the lower part of the
measuring range from being
detected (e.g. varying liquid head
at standstill). This enables flows to
be suppressed which should not be
measured or totalled.
Cut-in point
When the velocity of the medium
is less than 0.02 m/s creep
suppression is activated and all
output signals (pulse and analogue
signals) are set to the fall back
value (0/4 mA, logical “0”).
Cut-off point
When the velocity of the medium
again exceeds v = 0.04 m/s, creep
suppression is deactivated.
Nominal diameter
Cut-in point
Cut-off point
DIN
[mm]
ANSI
[inch]
at v = 0.02 m/s
in [m
3
/h]
at v = 0.04 m/s
in [m
3
/h]
2
1
/
12
"
0.0002
0.0005
4
5
/
32
"
0.0009
0.0018
8
5
/
16
"
0.004
0.007
15
1
/
2
"
0.013
0.025
25
1"
0.035
0.071
32
1
1
/
4
"
0.058
0.116
40
1
1
/
2
"
0.090
0.181
50
2"
0.141
0.283
65
2
1
/
2
"
0.239
0.478
80
3"
0.362
0.724
100
4"
0.565
1.131
125
5"
0.884
1.767
150
6"
1.272
2.545
200
8"
2.262
4.524
250
10"
3.534
7.069
300
12"
5.089
10.179
350
14"
6.927
13.854
400
16"
9.048
18.096
450
18"
11.451
22.902
500
20"
14.137
28.274
600
24"
20.358
40.715
700
28"
27.709
55.418
750
30"
31.809
63.617
800
32"
36.191
72.382
900
36"
45.804
91.609
1000
40"
56.549
113.097
1200
48"
81.443
162.860
1350
54"
103.060
206.120
1400
56"
110.836
221.672
1500
60"
127.234
254.468
1600
64"
144.764
289.528
1700
66"
163.426
326.852
1800
72"
183.218
366.436
2000
78"
226.194
452.388
ba0
08y
32
Hysteresis = -50% of creep rate
1
Cut-in point for suppression
2
Cut-off point for suppression
v
Creep rate
suppression
active
suppression
active
Time
Fig. 35
Promag 30
5. Operation and Commissioning
Hauser
33
Содержание promag 30
Страница 4: ...Promag 30 4 Endress Hauser ...
Страница 12: ...nichts nichts Promag 30 12 Endress Hauser ...
Страница 32: ...Promag 30 32 Endress Hauser ...
Страница 50: ...Promag 30 50 Endress Hauser ...
Страница 71: ......