Vega Capacitive electrodes EL 4 … 20 mA - Compact Bedienungsanleitung PDF herunterladen (Seite 29)

Capacitive electrodes EL 4 … 20 mA - Compact 29

22652-EN-020809

Setup

Mode 2 = Phase angle 45°

The capacitance and the ohmic conductance

are measured separately, the capacitance

value is corrected by calculating it with the

ohmic conductance, so that measurement

errors caused by conductive buildup or vary-

ing product moisture are compensated.

Application:

- highly conductive products

- adhesive, conductive products

- solids with fluctuating moisture content

For applications in conductive, viscous liquids,

you should use a suitable electrode of type EL

24.

(+/-) Mode 1 (90°)

(–) Mode 1 (90°)

(+) Mode 2 (45°)

7 Simulation current

With this function you can simulate the level.

As soon as the rotary switch is set to position

7, the simulation will be active. The current

value of the instantaneous level is used as the

initial simulation value. With the plus and minus

key you can modify the current value between

3.8 mA and 22 mA. Each push of the key

changes the current value by a 10 µA incre-

ment.

If you hold the key pushed, the value changes

automatically and with rising speed.

(+) increase current

(-) reduce current

8 Reset

This function sets all values to default.

Take note that the adjustment will also be

deleted. Tag number, measurement loop des-

ignation etc. from the HART

®

or VVO adjust-

ment, however remain unchanged.

(+/-) Default

Default

0 Operate ---

1 Min. adjustment 4 mA at 0 pF

2 Max. adjustment 20 mA at 3000 pF

3 Integration time 0.5 s

4 Reverse charact. 4 ... 20 mA

5 Linearisation Off

6 Sensor optimisation Mode 1 (90°)

7 Simulation current Off

8 Reset ---

9 Offset correction already saved values

remain

9 Offset correction

This function is necessary if an adjustment

should be carried out in m. This is only possi-

ble in conjunction with the CAP E 32 H oscilla-

tor. With this function, the initial capacitance in

the electronics is saved. A prerequisite is that

the electrode is mounted into the vessel and

that it is completely uncovered by the medium.

For electrodes with concentric tube, this func-

tion is already carried out at VEGA, as the

vessel does not influence the measurement.

The offset correction must only be repeated if

the oscillator is exchanged.

(+/–) Initial capacitance is saved

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