VEGA VEGABAR 44 HART - Manual (Page 30)

30 VEGABAR 44 (HART ® )
Setup
4.5 Setup with HART ® handheld
With any HART ® handheld you can set up
VEGABAR 44 like all other HART ® compatible
sensors. A special DD (Device Description)
is not necessary. Just connect the HART
®
handheld to the sensor signal cable after you
have connected the sensor to supply volt-
age.
Note:
If the resistance of the signal circuit is less
than 200
Ω
, a resistor of 250 … 350
Ω
must
be looped into the signal/connection line
during adjustment. The digital adjustment
and communication signals would otherwise
be short-circuited through insufficient resist-
ance of e.g. the supply voltage source or the
processing system. In such case, communi-
cation with the sensor would not be assured.
Simply connect the adjustment resistor in
parallel to the connection socket of the HART
®
handheld (see figure).
250
Ω
Ri < 200
Ω
+
–