Vega VEGABAR 86 Operating Instructions Manual page 10

3 Product description
Measuring system pres-
sure
Measuring system tem-
perature
Pressure types
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Fig. 3: Level measurement with VEGABAR 86
The sensor element is the CERTEC
ceramic diaphragm. The process pressure deflects the ceramic
diaphragm and causes a capacitance change in the measuring cell.
This capacitance change is converted into an electrical signal and
outputted as measured value via the output signal.
The measuring cell is available in two sizes:
•
CERTEC (ø 28 mm) with sensor 32 mm
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•
Mini-CERTEC (ø 17.5 mm) with sensor 22 mm
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A temperature sensor in the ceramic diaphragm of the CERTEC
on the ceramic base of the Mini-CERTEC
actual process temperature. The temperature value is output via:
•
The display and adjustment module
•
The current output or the additional current output
•
The digital signal output
Extreme process temperature jumps are also immediately detected
by the CERTEC measuring cell. The values are compared with that
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of an additional temperature measurement on the ceramic base body.
Within only a few measuring cycles the intelligent sensor electronics
compensates unavoidable measurement deviations due to tempera-
ture shocks. Such shocks cause (depending on the set damping) only
slight, brief changes to the output signal.
The measuring cell design depends on the selected pressure type.
Relative pressure: the measuring cell is open to the atmosphere.
The ambient pressure is detected in the measuring cell and compen-
sated. It thus has no influence on the measured value.
measuring cell with robust
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measuring cell detects the
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VEGABAR 86 • Modbus and Levelmaster protocol
or
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