Vega Capacitive electrodes EL 4 … 20 mA - Compact Bedienungsanleitung PDF herunterladen (Seite 28)

28 Capacitive electrodes EL 4 … 20 mA - Compact

22652-EN-020809

Setup

(+/-) 0.5 s

(+) increase time

(-) reduce time

Example: To set an integration time of 8 sec-

onds, you have to push the „+“ key 4 times.

4 Reverse characteristics

With this function you can reverse the charac-

teristics of the current output. The reverse is

also shown on the ammeter.

(+/-) 4 ... 20 mA

(-) 4 ... 20 mA

(+) 20 ... 4 mA

5 Linearisation

With this function you can activate the saved

linearisation curve. As a standard feature, the

curve for a cylindrical tank is contained in

memory. With CAP E 32 H you can also enter

other linearisation curves via VVO. In this

case, presetting the oscillator is not neces-

sary.

(+/-) Linearisation Off

(+) Linearisation ON

(-) Linearisation Off

6 Sensor optimisation

Mode 1 = Phase angle 90°Mode 1 = Phase angle 90°

Mode 1 = Phase angle 90°Mode 1 = Phase angle 90°

Mode 1 = Phase angle 90°

Mode 1 is a pure capacitance measurement,

the ohmic conductance is not taken into ac-

count in the measuring result. t

Application:

- standard setting

- non-conductive liquids up to approx.

500 µS

- compensation of conductance changes in

liquids

- generally with partly insulated electrodes in

liquids

- non-conductive solids without moisture

content

- with insufficient product grounding

- with electrodes in conjunction with a concen-

tric tube

- in non-conductive vessels with exterior

ground surface

2 Max. adjustment

This function is used to carry out the max.

adjustment. Fill the product to max. level (100

% level). Push the plus and minus key simulta-

neously. By doing this, you can set the current

value for the actual level to 20 mA.

If you want to assign a certain current value to

a known level, you can modify the current with

the plus and minus keys. Each push of the

key changes the current value by a 10 µA

increment.

If you hold the key pushed, the value changes

with rising speed.

Example: If you know that your vessel is filled

up to 90 % and will be completely full at

100 %, then you can enter under max. adjust-

ment a value of 18.4 mA.

20 mA - 4 mA = 16 mA

16 mA * 90% = 14.4 mA

14.4 mA + 4 mA = 18.4 mA

We recommend that you connect an ammeter.

See 3.2 Electrical connection. By doing this,

you can monitor the current value during

modification. If you hold the key pushed, the

value changes automatically and with rising

speed. The difference between min. and max.

adjustment should be at least 20% or 3.2 mA.

(+/-) set 20 mA

(+) increase current

(-) reduce current

3 Integration time

If you want to set the integration time (damp-

ing), you have to set the rotary switch to posi-

tion 3. With the plus and minus keys you can

double or halve the value of the integration

time step by step. As a standard feature, an

integration time of 0.5 seconds is set. Count

how often you push the key so that you can

set the time correctly. In case of doubt, you

can reset the integration time to the preset

value of 0.5 s by pushing both keys simulta-

neously. Then you repeat the setting. After the

set integration time has expired,

63 % of the measured value change are trans-

mitted to the output.

The following integration times can be selected

on the oscillator: 0.5; 1; 2; 4; 8; 16; 32; 64;

128; 256 (s)

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 43 44

Kommentare zu diesen Handbüchern

Keine Kommentare