9
3 Product description
WIKA Operating Instructions - Process pressure transmitter CPT-2x
Fig. 2: Process pressure measurement CPT-2x
Sensor element is the 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 output as measured value
via the output signal.
16 µm
1
2
3
Fig. 3: Configuration of the ceramic measuring cell
1 Process diaphragm
2 Glass joint
3 Base element
The measuring cell is available in two sizes: ø 28 mm and ø 17.5 mm.
Temperature sensors in the ceramic diaphragm and on the ceramic
body of the ø 28 mm measuring cell or on the electronics of the
ø 17.5 mm measuring cell detect the current process temperature.
The temperature value is output via:
•
The display and adjustment module
•
The current output or the digital signal output
Even extreme jumps in process temperature are immediately
detected by the ø 28 mm measuring cell. The values in the ceramic
diaphragm are compared with those on the ceramic base body. Within
a few measuring cycles, the intelligent sensor electronics compen-
sates for otherwise unavoidable measurement deviations caused by
temperature shocks in the range. Depending on the adjusted damp-
ing, these cause only slight and brief changes in the output signal.
Measuring system pres-
sure
Measuring system tem-
perature
