1 Introduction
ApplicationsThe Cerabar S pressure transmitter measures the pressure of gases, steam/vapour and
liquids and can be used in all areas of chemical and process engineering.
Operating principle
Ceramic sensor
The system pressure acts directly on the
rugged ceramic diaphragm of the pressure
sensor deflecting it by a maximum of
0.025 mm. A pressure-proportional change
in the capacitance is measured by the
electrodes on the ceramic substrate and
diaphragm. The measuring range is
determined by the thickness of the ceramic
diaphragm.
Metal sensor
The process pressure deflects the
separating diaphragm with a filling liquid
transmitting the pressure to a resistance
bridge. The bridge output voltage, which is
proportional to pressure, is then measured
and processed.
Level measurement
The hydrostatic pressure of a column of
liquid enables its level to be measured
continuously by a pressure transmitter if the
density ρ of the liquid is known.
h = p
hydr
/ρ·g
0 - 10 bar
0 - 10 bar
0 - 10 bar
Version with
thread
Version with
diaphragm seal
for flange mounting
Version with
diaphragm seal
for hygienic applications
BA211Y04
Figure 1.1
Examples of the Cerabar S
pressure transmitter
BA211Y05
Ceramic
support
Electrode
Resistance
bridge
Filling fluid
Diaphragm
Diaphragm
Ceramic measuring cell
Metallic measuring cell
Figure 1.2
Ceramic and metallic measuring cells
Cerabar S FF 1 Introduction
Endress+Hauser 7
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