KROHNE UFM 500 EN - Manual (Page 41)

41
Current output (term. I+, I, I
⊥
) Galvanically insulated
Functions
•
continuous flowrate measurement;
•
measurement of sound velocity to determine (composition of) liquid product;
•
status output.
Voltage 18 V DC
Current
I
0%
for Q = 0%
I
100%
for Q = 100%
0 to 16 mA
4 to 20 mA
Low-flow cut-off (SMU)
cut-off “on” value
cut-off “off” value
1 to 19%
2 to 20%
Forward/reverse measurements (F/R) Direction identified via pulse output or status output.
Time constant 0.04 to 3600 seconds, setting in increments of 1, 0.1 or 0.01 seconds
Maximum load at I = 100%
≤
680 ohms
Pulse output Galvanically insulated
Functions
•
continuous flow counting;
•
measurement of sound velocity to determine (composition of) liquid product;
•
status output.
Pulse rate for Q = 100% 10 to 3,600,000 pulses per hour
0.167 to 60,000 pulses per minute
0.0028 to 1,000 pulses per second (= Hz)
optionally in pulses per liter, m 3 or US gallons
Active output
Terminals B1, B
⊥
, I+, I
Voltage
Current
Load rating
For electromechanical (EMC) or electronic (EC) totalizers
19 - 32 V
DC
≤
50 mA
≥
650 ohms for single load as well as equivalent load (see figure 3 on page 5)
Passive output
Terminals B1, B
⊥
Input voltage
Load current
Open collector for connection of active electronic totalizers (EC) or switchgear
≤
32 V DC /
≤
24 V AC
≤
150 mA
Low-flow cut-off (SMU)
cut-off “on” value
cut-off “off” value
1 to 19%
2 to 20%
Forward/reverse measurements (F/R) direction identified via current output or status output
Time constant 0.04 seconds or same as current output
Status output
Functions
•
FATAL ERROR
•
US ERROR
•
F/R INDICATION
•
TRIP POINT
Active output
Terminals B
⊥
, B2, I+, I
⊥
Voltage
Current
Load rating
for electromechanical or electronic indicators
19 to 32 V
DC
≤
50 mA
≥
650 ohms for single load as well as equivalent load
*
(see sect. 2.3.5, figure 3)
Passive output
Terminals B
⊥
, B2
Input voltage
Load current
open collector for connection of active indicators
≤
32 V DC /
≤
24 V AC
≤
150 mA
*
Load on B1 and B2 terminals in parallel
settings in increments of 1 mA (I
max
= 22 mA)
of Q
100%
setting in 1% increments, independent of current output
of Q
100%
, setting in 1% increments, independent of pulse output