VEGA D95 Profibus PA - Manual (Page 4)

4 Pressure transmitter D95 (Profibus PA)
Product description
1 Product description
1.1 Function and configuration
D95 pressure transmitters are efficient instru-
ments for hydrostatic level measurement. A
dry metallic-capacitive measuring cell is used
as the pressure sensor element. The hydro-
static pressure effects a capacitance change
on the Duratherm 600 diaphragm. This ca-
pacitance 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 dig-
ital 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 transmitter D95 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 D95 is according to the profile specifi-
cation version 3.0. The instrument master file
(GSD) is supplied with the pressure transmit-
ter D95. 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