VEGA VEGASON 51K…53K - Manual (Page 46)

46 VEGASON 51K … 53K
Connection to a VEGA-signal condi-
tioning instrument
When you operate a HART ®- capable sensor
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
® -instrument.
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 643 150 … 200 Ohm
VEGAMET 513 S4, 514 S4
515 S4, VEGALOG EA-card
100 … 150 Ohm
Set-up
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.
Just connect the HART ® -handheld to the
signal line, after having connected the sensor
to power supply.
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.
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
Ω
+
-
250
Ω
Ri < 250
Ω
+
-
6.4 Adjustment with the HART ® -handheld