VEGA VEGAMET 391 4 … 20 mA_HART - Manual (Page 21)

21
6 Setup with the integrated display and adjustment unit
VEGAMET 391 • 4 … 20 mA/HART
36032-EN-130701
•
VVO protocol: Direct standard connection between signal condi-
tioning instrument and PC for parameter adjustment and enquiry
(e.g. with PACTware and DTM)
•
PPP: Dial-up connection between signal conditioning instrument
and modem for independent transmission of e-mails (dial-out con-
nection) or enquiry via web browser (dial-in connection)
•
ASCII protocol: Direct standard connection between signal con-
ditioning instrument and PC for enquiry with terminal programs,
e.g. Hyperterminal
→
Carry out your settings via the respective keys and save with
[OK]. Further information is available in the supplementary
instructions manual "RS232/Ethernet connection" and the online
help of the respective DTM.
With instruments with integrated RS232/Ethernet interface, the date
and time can be entered in this menu item. These time settings are
buffered in case of voltage loss via a capacitor as well as as battery
up to 10 years.
→
Carry out your settings via the appropriate keys and save with
[OK].
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 trans-
mission 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 always car-
ried 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, the unchanged initial value of the sensor is always
transmitted to VEGAMET 391. Thus, adjustment must always be car-
ried out on VEGAMET 391, never on the sensor. Different parameters
and measuring units are available.
When HART sensors from other manufacturers are connected, the
options PV (Primary Value) and SV (Secondary Value) are available.
Device settings - Date/
Time
Measurement loop - Input