Vega VEGAPULS 43 Profibus PA Bedienungsanleitung PDF herunterladen (Seite 43)

VEGAPULS 43 – Profibus PA 43

Set-up

Ampl.:

XX dB

S-N:

XX

dB

Enter in the menu window "

0 % corresponds

“

the numerical value of the 0 % filling. In the

example of the adjustment with the PC and

the adjustment software VVO, this would be

45 for 45 liters.

• Confirm with "

OK

“.

With the "—>“ key you switch to the 100 %

menu. Enter here the numerical value of your

parameter corresponding to a 100 % filling.

In the example 1200 for 1200 liters.

• Confirm with "

OK

“.

If necessary, choose a decimal point. How-

ever, note that only max. 4 digits can be

displayed. In the menu "

prop. to

“ you choose

the physical quantity (mass, volume, dis-

tance…) and in the menu "

Unit

“ the physical

unit (kg, l, ft

3

, gal, m

3

…).

Linearisation:

A linear correlation between the percentage

value of the product distance and percent-

age value of the filling volume has been pre-

set. With the menu "Lin. curve“ you can

choose between linear, spherical tank and

cylindrical tank. The generation of a custom-

ized linearisation curve is only possible with

the PC and the adjustment program VVO.

6. Meas. conditions

(see menu schematic)

7. False echo storage

A false echo storage is always useful when

unavoidable false echo sources (e.g. struts)

must be minimised. By creating a false echo

memory, you authorise the sensor electronics

to record the false echoes and save them in

an internal database. The sensor electronics

treats these (false) echoes differently from

the useful echoes and filters them out.

8. Useful level, noise level

In the menu

you get important information on the signal

quality of the product echo. The greater the

"S-N“ value, the more reliable the measure-

ment (menu plan MINICOM).

Ampl.: means amplitude of the level echo in

dB (useful level)

S-N: means Signal-Noise, i.e. the useful

level minus the level of the back-

ground noise

The greater the "S-N“ value (difference be-

tween the amplitudes of the useful signal level

and the noise level), the better the measure-

ment:

> 50 dB Measurement excellent

40 … 50 dB Measurement very good

20 … 40 dB Measurement good

10 … 20 dB Measurement satisfactory

5 … 10 dB Measurement sufficient

< 5 dB Measurement poor

Example:

Ampl. = 68 dB

S-N = 53 dB

68 dB – 53 dB = 15 dB

This means that the noise level is only

68 dB – 53 dB = 15 dB.

A 15 dB noise level and a 53 dB signal differ-

ence yield a high degree of measurement

reliability.

9. Outputs

Under the menu "Outputs“ you determine, for

example, whether the current output should

be inverted, or which unit of measurement

should be shown on the sensor display.

Lin.

curve

Linear

Integra

tion

time

0 s

Adjust

ment

Signal

condit

ioning

Scal

ing

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