The signal conditioning instrument can process the VEGAMET 391
can process measured values from 4 … 20 mA/HART sensors via
analogue communication as well as via digital HART protocol.
Analogue 4 … 20 mA transmission
In the standard setting of VEGAMET 391 the measured value
transmission is carried out via analogue 4 … 20 signal. An adjustment
in the sensor influences directly the input variable of VEGAMET 391.
Only carry out the adjustment on one instrument, either on VEGAMET
391 or on the sensor. The adjustment in VEGAMET 391 is a lways
carried out in mA (analogue transmission).
Digital HART transmission
For transmission via HART, VEGAMET 391 must be informed which
sensor value should be used for further processing. Depending on the
sensor type, this can be distance, pressure or temperature. With all
HART sensors, always the unchanged initial value of the sensor is
transmitted to VEGAMET 391. Thus, the adjustment must always
carried out on VEGAMET 391, never on the sensor. Different
parameters and meas. units are available.
When HART sensors from other manufacturers are connected, the
options PV (Primary Value) and SV (Secondary Value) are available.
The prerequisite for this is the support of the HART commands 0, 1, 3,
and 15. This information and which measured values are transmitted
can be found in the operating instructions manual of the respective
sensor manufacturer.
Carry out your settings via the respective keys and save with [OK].
The measured variable defines the applicaton of the measurement
loop, the following settings are available depending on the connected
sensor:
l Level
l Process pr essure
l Universal
l Temperature
l Interface
l Flow (only after activating via PACTware or DTM)
Carry out your settings via the respective keys and save with [OK].
Measurement loop - In-
put
Meas. loop - Parameter
VEGAMET 391 • 4 … 20 mA/HART signal conditioning instrument 21
6 Setup with the integrated indicating and adjustment unit
36032-EN-091116
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