10
3 Product description
VEGABAR 38 • Three-wire with IO-Link (2 x transistor or 4 … 20 mA plus 1 x transistor)
57532-EN-191014
The VEGABAR 38 is suitable for the measurement of the following
process variables:
•
Process pressure
•
Level
Fig. 3: Process pressure measurement VEGABAR 38
The sensor element is the Mini-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.
14 m
1
2
3
Fig. 4: Configuration of the Mini-CERTEC
®
measuring cell
1 Process diaphragm
2 Glass joint
3 Base element
A temperature sensor in the electronics of the Mini-CERTEC
®
meas-
uring cell measures the current process temperature. The tempera-
ture value is output via Bluetooth or the display.
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.
Measured variables
Measuring system pres-
sure
Measuring system tem-
perature
Pressure types
