Vega VEGABAR 41 4 … 20 mA Bedienungsanleitung PDF herunterladen (Seite 4)

4 VEGABAR 41 (4 … 20 mA)

Product description

1 Product description

1.1 Function and configuration

VEGABAR 41 is an efficient pressure trans-

mitter with isolating system for process pres-

sure measurement and hydrostatic level

measurement. The hydrostatic pressure of

the products acts on the separating dia-

phragm of the isolating system and is trans-

mitted via the isolating liquid to the metal-

capacitive measuring cell. This capacitance

change is detected by an ASIC (Application

specific integrated circuit) and converted by

the internal electronics with microcontroller

into a pressure-proportional signal. The pre-

cise, high-resolution digital processing of

measurement data ensures perfect technical

data.

Isolating systems are used to protect the

measuring cell against corrosive products or

high temperatures. With the right choice of

isolating liquid and diaphragm material, these

systems can provide a temperature resist-

ance up to 400°C.

The electronics module is powered by a

separate VEGA-signal conditioning instru-

ment, a stabilised power supply unit or a PLC

(active input). After adjustment, a standard

current signal 4 … 20 mA is made available

and can be displayed or (e.g. in PLC-sys-

tems) further processed.

For carrying out adjustment, the following

alternatives are available:

- adjustment module directly on VEGABAR

- adjustment modules in external housing

(VEGADIS 10)

1.2 Self-monitoring

To improve reliability, the functionality of im-

portant electronic components is continu-

ously checked, and internal parameters such

as sensor value, temperature and operating

voltage are closely monitored.

VEGABAR 41 with the ceramic CERTEC

®

-

measuring cell offers the advantage of con-

tinuous self-monitoring. The measuring and

reference capacitances of the measuring cell

constitue a predefined ratio over the entire

measuring range. Any deviation from these

data is a reliable indicator of a malfunction of

the measuring cell.

If errors or malfunctions are detected during

these routines, a fault signal is triggered via

the 4 … 20 mA-output (current jump to

3.6 mA or 22 mA).

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