FISCHER Mess- und Regeltechnik GmbH
Product and functional description | 2
BA_EN_DA01_VUW
11 / 32
2.3 Function diagram
1
2
3
4
5
6
7
8
8
7
Fig. 10:
Function diagram
1
Motion train
2
Transfer lever
3
Measuring shaft
4
Pressure transfer fluid
5
Separating membrane
6
Connecting rod
7
Measuring diaphragm
8
Pressure chamber
2.4 Design and mode of operation
The pressures in the pressure chambers that are to be compared are each ex-
erted onto a measuring membrane that can be rigidly connected using a con-
nection rod. To compensate the static pressure, the space between the separat-
ing and measuring membrane is filled with a pressure transfer fluid.
During pressure equalisation, the two measuring membranes are in an idle pos-
ition. In case of pressure difference, the force acting on the membranes causes
it to be moved towards the side of the lower pressure.
The connecting rod transfers the deflection of the measuring membranes onto
the transfer lever mounted to the measuring shaft. Proportional to the current
differential pressure, the measurement shaft makes a rotational movement that
the indicator translates into a rotation angle between 0 and 270°.
In the case of one-sided pressure by the measuring system above and beyond
the measuring range, the over-pressure guard will be activated which supports
the overlosaded membrane.