Principle Of Operation; Operation - Vega VEGABAR 66 Operating Instructions Manual

3 Product description
Application area
Functional principle
Power supply
10

3.2 Principle of operation

VEGABAR 66 is a suspension pressure transmitter for level
measurement in wells, basins and atmospherically open vessels.
For use in atmospherically closed vessels under vacuum, the
instrument is available with absolute pressure measuring ranges.
The actual sensor element is the CERTEC
rugged ceramic diaphragm. The hydrostatic pressure causes a
capacitance change in the measuring cell via the ceramic diaphragm.
This change is converted into an appropriate output signal.
®
measuring cell is also equipped with a temperature
The CERTEC
sensor. The temperature value can be displayed via the indicating and
adjustment module or processed via the signal output.
Two-wire electronics 4 ... 20 mA/HART for power supply and
measured value transmission over the same cable.
The supply voltage range can differ depending on the instrument
version.
The data for power supply are specified in chapter "Technical data".
The background lighting of the indicating and adjustment module is
powered by the sensor. Prerequiste is a certain heigt of the operating
voltage. You can find the exact voltage specifications in chapter
"Technical data".
The optional heating requires its own operating voltage. You can find
details in the supplementary instructions manual "Heating for indicat-
ing and adjustment module".
This function is generally not available for approved instruments.

3.3 Operation

VEGABAR 66 can be adjusted with different adjustment media:
with indicating and adjustment module
l
with the suitable VEGA DTM in conjunction with an adjustment
l
software according to the FDT/DTM standard, e.g. PACTware and
PC
with manufacturer-specific adjustment programs AMS™ or PDM
l
With a HART handheld
l
The entered parameters are generally saved in VEGABAR 66,
optionally also in the indicating and adjustment module or in
PACTware.
®
measuring cell with
VEGABAR 66 • 4 ... 20 mA/HART