Vega D96_D97 Profibus PA Bedienungsanleitung PDF herunterladen (Seite 4)

4 Pressure transmitter D96/D97 (Profibus PA)

Product description

1 Product description

1.1 Function and configuration

D96 and D97 pressure transmitters are effi-

cient instruments for hydrostatic level meas-

urement. A dry ceramic-capacitive CERTEC

®

measuring cell is used as the pressure sen-

sor element for D96. D97 uses a dry metallic-

capacitive measuring cell with Duratherm 600

diaphragm. The hydrostatic pressure effects

a capacitance change on the diaphragm.

This capacitance change is detected by an

ASIC (Application Specific Integrated Circuit)

and converted into a pressure-proportional

signal by the integrated electronic module

with microcontroller. Precise, high-resolution

digital processing of measurement data

ensures excellent technical data.

The electronics module is powered by a

Profibus DP - PA segment coupler. The

measured pressure is transmitted as a digital

signal via the bus cable to the processing

system and can be displayed on the indicat-

ing module.

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.

The pressure transmitters D96 with ceramic

CERTEC

®

measuring cell offer the advantage

of continuous self-monitoring: the measuring

and reference capacitances of the measuring

cell constitute a predefined ratio over the

entire measuring range. Any deviation from

these data is a reliable indicator of a malfunc-

tion of the measuring cell. If errors or mal-

functions are detected during these routines,

fault signals are triggered according to the

Profibus PA specification.

The pressure transmitter consists of two

parts, the transmitter and the processing

unit. Both parts are connected via a three-

wire screened cable (depending on the ver-

sion, with or without breather capillaries). The

processing unit contains the adjustment

elements (address switch, keys and LCD)

and the terminals for the Profibus PA cable.

Profibus PA version

The instrument profile of the pressure trans-

mitter D96/D97 is according to the profile

specification version 3.0. The instrument

master file (GSD) is supplied with the pres-

sure transmitter D96/D97. In addition, the

GSD is available as a download file from the

VEGA homepage (www.vega.com).

Adjustment and indication

The following adjustment versions are avail-

able:

- menu-driven adjustment (4 keys and DOT-

Matrix) in the processing unit

- via PC with the adjustment software VEGA

Visual Operating (VVO)

- optional, processing unit equipped with an

indicating module.

0 - 20 bar

Transmitter

Processing unit

Profibus PA

cable

1 2 3 4 5 6 7 8 9 ... 35 36

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