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OPERATING MANUAL HPC & UMC4
9.2
Failure signal
A failure in the meter can be indicated via the current outputs or the status output. The current outputs
can be set to a failure signal (alarm) of I < 3.8 mA or I > 22 mA. The status output can be configured as
make or break contact.
9.3
Load
Standard version:
500 ohms
Explosion-proof version:
500 ohms
HART
minimum load:
> 250 ohms
10 V is the minimal needed voltage at passive current output terminals. The maximum voltage of 30 V
must never be exceeded. The maximum load is calculated according to the equation:
500
23
1
10
max
mA
V
U
R
0 Ohm
100 Ohm
200 Ohm
300 Ohm
400 Ohm
500 Ohm
600 Ohm
0 V
5 V
10 V
15 V
20 V
25 V
30 V
lo
ad
external power supply voltage
maximum load
Rmax
9.4
Damping
Programmable from 1 to 60 seconds
9.5
Low flow cutoff
The low flow cutoff can be set to values between 0 and 20% using the software. The set value refers to
the upper-range value. If the measured value is lower than the set volume, the flow rate will set to 0.0
(kg/h). This results in the analog output being set to 0/4 mA, and the pulse output will stop generating
pulses.
