FISCHER Mess- und Regeltechnik GmbH
Product and functional description | 2
BA_EN_DE80
7/28
2.4 Design and mode of operation
The device is based on a piezo-resistive sensor element that is suitable for
measuring overpressure, under-pressure and differential pressure. The pres-
sures to be compared have a direct effect on a silicon membrane equipped with
a measuring bridge.
When the pressure is equal, the measuring membrane is in its idle state. If a
pressure difference occurs, the membrane is deflected and a resistance change
takes place on the attached measuring bridge. This change is evaluated by the
device's electronics and transformed into an analogue output signal. The output
signal can be attenuated and square rooted.
Optionally, the device can be delivered with a full-graphic LC display and a
changeover contact. In addition, the device is available as a 2-wire or Modbus
RTU variant. Overall, the device can be delivered with the following equipment.
3-wire
2-wire
Modbus RTU
Analogue output
0/4 … 20 mA or 0/2 … 10 V
x
Current loop 4 … 20 mA
x
RS485 Modbus RTU
x
Options:
Full graphic LC display
x
x
x
Changeover contact
x
2.5 Device versions
Outwardly, the DE80 only differs in the version with measured value display and
without measured value display. Both versions are available as a 2-conductor
and 3-conductor version. All other features can be configured using DIP
switches on devices with analogue output or via the interface on the Modbus
version.
With measuring value display
Without measuring value display
Fig. 2:
Product summary
Connections
Connection on the pressure side is made by means of a hose nipple. The hose
nipple is suitable for both 8/6 mm and 6/4 mm hose.
+
8mm Hose connection
6mm Hose connection
Fig. 3:
Process connections
