Vega Capacitive electrodes EL 4 … 20 mA - Compact Bedienungsanleitung PDF herunterladen (Seite 31)

Capacitive electrodes EL 4 … 20 mA - Compact 31

22652-EN-020809

Connection to a VEGA signal conditioning

instrument

(fig. 3 on the next page)

If you operate a HART

®

capable sensor on a

VEGA signal conditioning instrument, you

have to a connect a resistance (acc. to the

following table) to the sensor connection on

the signal conditioning instrument during the

HART

®

adjustment.

VEGA signal conditioning instr. Rx

VEGAMET 513, 514, 515, 602

VEGATRENN 544

VEGATOR 521…527 50 … 100 Ohm

VEGAMET 614 no additional

VEGADIS 371 resistance

necessary

VEGAMET 601 200 … 250 Ohm

VEGASEL 643 150 … 200 Ohm

VEGAMET 513 S4, 514 S4

515 S4 100 … 150 Ohm

4.4 Adjustment with HART

®

handheld

The capacitive electrodes EL with oscillator

CAP E32 H Ex are HART

®

protocol capable

and can be adjusted with a HART

®

handheld.

All relevant sensor functions can be executed

with the HART

®

standard menus. A manufac-

turer-specific DDD (Data-Device-Description)

is not necessary.

Connect the HART

®

handheld to the sensor

signal cable after you have connected the

sensor to power supply.

Multidrop mode

The multidrop mode can be selected with the

HART

®

handheld.

With this mode, several HART

®

sensors can

be connected to a single two-wire cable.

Beside the 4 … 20 mA signal, the sensor also

delivers a digital (HART

®

) level signal.

• If you enter address 0 (factory setting), the

sensor consumes a level-dependent

4 … 20 mA current and delivers a digital

(HART

®

) level signal. It is also possible to

connect e.g. an indicating instrument

(4 … 20 mA) to this cable.

• If you enter an address between 1 and 15,

the sensor consumes a permanent 4 mA

current and delivers a digital (HART

®

) level

signal.

Burst mode

Normally the sensor signals the measured

values to the processing unit only on request.

If you switch on the burst mode, the sensor

signals the measured value without being

requested.

4

3

2

1

+ - + -

mA

250 Ohm

HART

®

handheld

Setup

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