Signal converter vfc 091 – KROHNE VFM 1091 User Manual
Page 36
Diagram I
Diagram II
Pressure loss p for air 1.013 bar / 0
o
C (32
o
F) / n = 1.29 kg/m3
Pressure loss p for water 20
o
C /
rn = 998.2 kg/m3
(14.69 psig/0
o
C/
rn = 0.081 lbs/ft)
(680
o
F/n = 62317 lbs/ft)
p (psig)
p(mbr)
p (psig)
p(mbr)
7
5
3
2
7
5
3
2
7
5
3
2
10
1
A B C D
E
F
G
H
I
J
K
2 3 5 7 10
2 3 5 7 100
2 3 5 71000
2
0.1
3 5 7 10000
1
1.02
0.73
0.44
.29
.15
.10
0.073
0.044
0.029
0.015
0.010
0.0 073
0.0044
0.0029
0.0015
1.45
100
62 1
10
100
1000
10000
2 3 5 7
2 3 5 7
2 3 5 7
2 3 5 7
m /h
US GPM
3
7
5
3
2
7
5
3
2
7
5
3
2
100
10
A B C D E F G H I J K
2 3 5 7 1
2 3 5 7 10
2 3 5 7100
2 3 5 7 1000
0
10.15
7.25
4.35
2.90
1.45
1.02
0.73
0.44
0.29
0.15
0.10
0.07
0.044
0.029
0.015
14.50
1000
44 1
10
100
1000
2 3 5 7
2 3 5 7
2 3 5 7
2 3 5 7
m /h
US GPM
3
Table for diagrams I + II and constantC
Table for Diagrams I+II and constant C
Curve
Meter size
Constant C
Curve
Meter size
Constant C
A
DN 10 S / 3/8”S
13.7
G
DN50 / 2”
7.80 x 10
-3
B
DN 10 / 3/8”
3.42
H
DN80 / 3”
1.90 x 10
-3
C
DN 15 / 1/2”
1.75
I
DN100 / 4”
5.30 x 10
-4
D
DN 20 / 3/4”
0.45
J
DN150 / 6”
1.60 x 10
-4
E
DN 25 / 1”
1.50 x 10
-1
K
DN200 / 8”
5.90 x 10
-5
F
DN 40 / 1-1/2”
3.30 x 10
-2
Signal converter VFC 091
Full-scale
rangeprogrammable in litres, m3, US gallons, kgs, tonnes, lbs or standard flow rate per second minute or hour
Power supply U
B
14-36 V Dc with 100 ohms min in series
EEx (ib) 14 - 30 V DC
Current output (term, 5/6)
4 - 20 mA, DC, 2-wire
Load
RB
=
U
B
- 12 V
20 mA
Ambient temperature T
B
see Diagram III
Local display
3-field LCD
Display functions
actual flowrate and sum totalizer (8-digit), each programmable for continuous or sequential display
of measured parameters and error messages
Display units
Engineering units or % of full scale
Actual flowrate
liters, m
3
, US gallons, kgs, tonnes, lbs or standard flow rate per second, minute or hour
Totalizer liters,
m
3
, US gallons, kgs, tonnes, lbs, ft
3
Display :
1st field (top)
8-digit, 7- segment display and sign, symbols for key acknowledgement
2nd field (middle)
10 character, 14 segment text display
3rd field (bottom)
6 markers
t
to identify current display
Mass flow measurement (off-line)
operating and standard density programmable
1200
900
18.5
30
36
14
EEx
Standard
R (ohms)
B
U
B
(V)
36