10
3 Product description
WIKA Operating Instructions - Process pressure transmitter CPT-2x
16 µm
1
2
3
Fig. 3: Configuration of the ceramic measuring cell
1 Process diaphragm
2 Glass joint
3 Base element
A temperature sensor in the ceramic diaphragm of the ø 28 mm or on
the ceramic base of the ø 17.5 mm measuring cell detects the actual
process temperature. The temperature value is output via the master
sensor.
Even extreme jumps in process temperature are immediately de-
tected by the ø 28 mm measuring cell. The values are compared with
those of an additional temperature measurement on the ceramic base
body. Within a few measuring cycles, the intelligent sensor electron-
ics compensates for otherwise unavoidable measurement devia-
tions caused by temperature shocks in the range. Depending on the
adjusted damping, these cause only slight and brief changes in the
output signal.
1)
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.
Measuring system tem-
perature
Pressure types
Seal concepts
Recessed installation
1)
At temperatures above 100 °C the function is automatically deactivated, at
temperatures below 95 °C it is automatically reactivated.