
IM-P309-02
MI Issue 2
26
8.11 Output Signal
8.11.1 Isolation
All signal outputs are electronically isolated from each other and ground (PE)
8.11.2 Analog output
A single 0/4-20mA current output is fitted with optional HART communications and can be
configured to output flow rate in volumetric or velocity units.
8.11.3 Pulse output
A single pulse output is fitted.
Passive via optocoupler:
U = 24 V
Umax = 30 V
Imax = 60 mA
Pmax = 1.8 W
Pulse duration: 50ms (default value)
Pulse duration adjustable from: 0.1 to 2000ms
Mark-to-space ratio: 1 to 1 if the maximum pulse duration is not met
When adjusting the pulse duration, a check is carried out to ensure the pulse duration does
not exceed the upper limit. If the upper limit is exceeded an error message will be displayed.
Frequency: fmax = 1 kHz
Pulse value: 1 pulse/unit. The pulse value can be multiplied by a factor between 0.001 and
100.0 in decade increments of the selected units e.g. m3
Status output: for forward and reverse flow, MIN and MAX flow rate or alarm
8.11.4 Failure signal
A failure in the meter can be indicated via the current output or the status output.
The current output can be set to alarm of I < 3.8mA of I > 22mA.
The status output can be configure as a make or break output.
8.11.5 Current output load
Standard version: 600 Ohms
HART version: minimum load > 250 Ohms
8.11.6 Damping
Programmable: from 0 to 60 seconds
8.11.7 Low flow cut-off
Configurable: from 0 to 20% of maximum flow.
If the measured value is lower than the low flow cut-off set value the flow rate will show zero
and the analogue output will switch to 0/4 mA and the pulse output will stop generating pulses.
The configurable hysteresis only takes effect on one side of this limit.
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