Operating Instructions - VEGAPULS 54K enamel

4.4 Adjustment with HART ® handheld
With any HART ® handheld you can set up the
VEGAPULS series 50K radar sensors like all
other HART ® compatible sensors. A special
DDD (Data Device Description) is not necessary.
Note:
If the resistance of the power supply is less
than 250 Ohm, a resistor must be connected
into the signal/connection loop during adjustment.
250 Ω
Connection to a VEGA signal conditioning
instrument
If you operate a HART ® compatible sensor on
a VEGA signal conditioning instrument, you
have to connect the sensor via a resistor
(see following table) during HART ® adjustment.
This resistor, together with the internal
resistance of the instruments, provides the
value of 250 Ohm required for the HART ®
instrument. An inherent system load resistance
allows a corresponding reduction of Rx.
+
-
+
Just connect the HART ® handheld to the
signal cable, after having connected the
sensor to power supply.
Ri ≥ 250 Ω
Set-up
The digital adjustment and communication
signals would otherwise be short-circuited
due to insufficient resistance of the supply
current source or the processing system,
and as a result, communication with the sensor
would not be ensured.
VEGA signal conditioning instr. Rx
VEGAMET 513, 514, 515, 602 50 … 100 Ohm
VEGAMET 614 no additional
VEGADIS 371 resistor
required
VEGAMET 601 200 … 250 Ohm
VEGASEL 643
VEGAMET 513 S4, 514 S4
150 … 200 Ohm
515 S4, VEGALOG EA card 100 … 150 Ohm
36 VEGAPULS 54K enamel
-
Ri < 250 Ω
24 101-EN-041227