10
3 Product description
WIKA Operating Instructions - Process pressure transmitter CPT-2x
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.
Absolute pressure
: the measuring cell contains vacuum and is
encapsulated. The ambient pressure is not compensated and does
hence influence the measured value.
The following presentations show examples for the installation of the
ceramic measuring cell into the process fitting and the different seal
concepts.
The recessed installation is particularly suitable for applications with
gases, vapours and clear liquids. The measuring cell seal is posi-
tioned laterally as well as in addition in front.
1
2
5
6
3
4
Fig. 4: Recessed installation of the measuring cell (example: manometer con-
nection G½)
1 Measuring cell
2 Seal for the measuring cell
3 Additional, front seal for measuring cell
4 Diaphragm
5 Process fitting
6 Seal for the process fitting
The front-flush installation is particularly suitable for applications with
viscous and abrasive media and in case of buildup. The measuring
cell seal is positioned laterally.
Pressure types
Seal concepts
Recessed installation
Front-flush mounting with
single seal