VEGA VEGASCAN 850 - Manual (Page 5)

VEGASCAN 850 5
Product description
Output signal
The level-proportional measuring signal of the
sensors is received, processed and
outputted digitally throughout. VEGASCAN
850 reads in the digital sensor measured
values permanently and processes the indi-
vidual levels according to the user’s selected
options. Depending on the version of
VEGASCAN, max. 15 sensors can be con-
nected to one screened two-wire cable or 30
sensors on two screened two-wire cables.
The two-wire cable transfers beside the dig-
ital level signal and adjustment signals also
the supply voltage of 24 V.
The sensor measured values can be proc-
essed and outputted in VEGASCAN as levels
in percent, volume or mass units. In addition,
linked process tasks such as scaling, lineari-
sation, differential generation, addition, ten-
dency processing or limit value processing
can be selected individually. As a result,
VEGASCAN can carry out - decentralised
and without costly programming - the entire
measurement-related arithmetic.
The levels and their processed results are
then outputted in the following field bus pro-
tocols and interfaces depending on the or-
dered version of VEGASCAN 850.
Protocol Interface
Siemens 3964 - RS 232
- RS 422
- RS 485
- TTY
VEGA-ASCII - RS 232
- RS 422
- RS 485
- TTY
Modbus - RS 232
- RS 422
- RS 485
- TTY
Profibus DP - RS 485
Profibus FMS - RS 485
The digital processing of the measured si-
gnal ensures an accuracy that an analogue
measuring signal could never reach, as the
digital signal is always transferred without
error right down to the last bit and decimal
point position.
Varying line resistance or small leakage cur-
rents do not influence the accuracy (digital
technology). The digital signal is always un-
ambiguous.
Display of measured values
As an option, the series 50 ultrasonic sensors
can be equipped with an indicating instru-
ment for direct, local level survey. The indi-
cating instrument shows the precise level by
means of the analogue bar graph and the
digital number value. In addition to the indica-
tion in the sensor, you can have the level
displayed by the VEGADIS 50 external indi-
cating instrument at a distance of up to
25 m from the sensor. The external display of
measured values operates, like the inte-
grated display, independently of the output
signal, can be modified through individual
parameter settings, and is connected to and
powered by the sensor.