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
ba008y32
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
Endress+Hauser 33
To Next Page
Loading...
