VEGA VEGASON 51K…53K - Manual (Page 4)

4 VEGASON 51K … 53K
Product description
1 Product description
1.1 Function
The continuous level measurement with ultra-
sonic sensors is based on the running time
measurement of ultrasonic pulses.
Measuring principle
Piezoceramic high performance transducers
emit focused ultrasonic pulses which are
reflected by the surface of solids and liquids.
The measuring electronics prepare a precise
picture of the environment from the running
time and the signal form of the reflected ultra-
sonic pulses. The transducers work as trans-
mitter and receiver. As receiver the trans-
ducers are high sensitivity piezo-micro-
phones.
In order to be prepared for the different
measuring distances and requirements, the
instruments operate with emitting frequencies
of 34 kHz up to 70 kHz.
As the sound velocity is subjected to a tem-
perature influence, the transducer also con-
tinuously detects the ambient temperature so
that the level is precisely provided even in
case of varying ambient temperature.
Output signals
The level proportional measuring signal is
provided as 4 … 20 mA-output signal.
The parameter adjustment of the analogue
4 … 20 mA-signal is individually possible and
reflects the measuring range or the adjusted
adjustment range of the sensor.
Measured value indication
If desired, an indicating instrument for direct
lobal survey can be mounted on to the series
50 ultrasonic sensors. The indicating instru-
ment shows the precise level with the ana-
logue bar-graph and with the digital figure. In
addition to the indication in the sensor itself,
you can have the level displayed with the
external indicating instrument VEGADIS 50
up to 25 m away from the sensor.
The external measured value indication oper-
ates, like the integral indication, independent
of the 4 … 20 mA-output signal, and indi-
vidual parameter adjustment is possible.
emission - reflection - receipt
Meas.
distance
The measuring electronics precisely calculate
the distance between transducer and me-
dium from the speed of sound and the actu-
ally detected running time of the emitted
sound impulse. The distance is then con-
verted into a level proportional signal and
provided according to the sensor parameter
adjustment as precise scaled level.