Adjustment With The Hart; Handheld - Vega VEGASON 51K Operating Instruction

6.4 Adjustment with the HART

®
With each HART -handheld you can set-up
the VEGASON series 50K ultrasonic sensors
like all other HART ® -capable sensors. A spe-
cial DDD (Data Device Description) is not
necessary.
Note:
If the resistor of the power supply is less than
250 Ohm, a resistor must be looped into the
signal/connection line during adjustment.
Connection to a VEGA-signal condi-
tioning instrument
When you operate a HART
on a VEGA-signal conditioning instrument,
you have to connect the sensor via a resistor
according to the following table during the
®
HART -adjustment, to reach together with the
inner resistor of the instruments the value of
250 Ohm required for the HART
58
®

-handheld

+
-
+
250
®- capable sensor
®
-instrument.
Just connect the HART
signal line, after having connected the sensor
to power supply.
Ri < 250
The digital adjustment and communication
signals would be short-circuited via too small
resistors of the supply current source of the
processing system which means that the
sensor communication could not be ensured.
-
Ri < 250
VEGA-signal conditioning instr.
VEGAMET 513, 514, 515, 602
VEGAMET 614
VEGADIS 371
VEGAMET 601
VEGASEL 643
VEGAMET 513 S4, 514 S4
515 S4, VEGALOG EA-card
Set-up
®
-handheld to the
Rx
50 ... 100 Ohm
no additional
resistor
required
200 ... 250 Ohm
150 ... 200 Ohm
100 ... 150 Ohm
VEGASON 51K ... 53K