DCS ADR24 Instructions d'exploitation télécharger pdf (Page 4)

4 VEGASON 51P … 53P

Product description

1 Product description

1.1 Function

Continuous level measurement with ultrasonic

sensors is based on the running time meas-

urement of ultrasonic pulses.

Measuring principle

High performance piezoceramic transducers

emit focused 70 kHz ultrasonic pulses which

are reflected by the product surface. The

measurement electronics prepares a precise

image of the environment from the reflected

ultrasonic pulses. The transducers work both

as transmitter and receiver. As receiver, the

transducers are high-sensitivity piezo micro-

phones.

emission - reflection - reception

Meas. dis-

tance

Since the speed of sound is subject to tem-

perature influence, the transducer also con-

tinuously detects the ambient temperature,

so that the level is precisely measured even

in case of varying ambient temperature.

Output signal

The level-proportional Profibus PA measuring

signal is processed and outputted com-

pletely digitally. Digital processing of the

measuring signal ensures an accuracy which

could be never reached by an analogue

measuring signal, as the digital signal is

always transmitted error-free right up to the

last decimal point.

Varying line resistances or tiny leakage cur-

rents do not influence the accuracy of digital

technology. The digital signal is always clear

and unambiguous.

The digital signal, mirroring the adjusted

measuring range of the sensor, can be modi-

fied by various parameter settings.

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 with the VEGADIS 50 external

indicating 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 PA out-

put signal and can be modified through indi-

vidual parameter settings.

The measurement electronics precisely cal-

culates the distance between transducer and

medium from the speed of sound and the

measured running time of the emitted sound

impulse. The distance is then converted into

a level-proportional signal and, in conjunction

with the sensor parameter settings, made

available as a precise, calibrated level value.

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