Download Operating Instructions - VEGABAR 82 - Slave sensor for

3 Product description
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Absolute pressure
Vacuum
Measured products
Measured products are gases, vapours and liquids.
Measuring system
Sensor element is the CERTEC® measuring cell with robust 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.
Depending on the process fitting and measurement setup, measured
products can be also viscous or contain abrasive substances.
The CERTEC® measuring cell is available in two sizes:
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Pressure types
ø 17.5 mm with small process fittings
ø 28 mm with large process fittings as well as all flange connections
The measuring cell design depends on the selected pressure type.
Relative pressure: the measuring cell is open to atmosphere. The
ambient pressure is detected in the measuring cell and compensated.
It thus has no influence on the measured value.
Absolute pressure: the measuring cell is evacuated and encapsulated. The ambient pressure is not compensated and does hence
influence the measured value.
Relative pressure, climate-compensated: the measuring cell is
evacuated and encapsulated. The ambient pressure is detected
through a reference sensor in the electronics and compensated. It
thus has no influence on the measured value.
Seal concepts
Recessed installation
The following presentations show the installation of the CERTEC®
measuring cell into the process fitting and the different seal concepts.
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45050-EN-131011
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Fig. 3: Recessed installation of the CERTEC® measuring cell
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Measuring cell
Seal for the measuring cell
Diaphragm
Process fitting
Seal for the process fitting
VEGABAR 82 • Slave sensor for electronic differential pressure
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