Deltabar PMD78B HART
Product description
Hauser
11
3
Product description
3.1
Product design
3.1.1
Measuring cell for differential pressure with metal process
membrane
+ -
p
1
p
2
p
1
1
2
3
4
5
4
p
2
A0043081
1
Capillary on the second side (P1) is optional
1
Measuring element
2
Middle diaphragm
3
Fill fluid
4
Internal process membrane
5
Process membrane of the diaphragm seal
p
1
Pressure 1
p
2
Pressure 2
+ -
p
1
p
2
p
1
1
2
3
4
4
p
2
5
A0043082
1
Measuring element
2
Middle diaphragm
3
Fill fluid
4
Internal process membrane
5
Process membrane of the diaphragm seal
p
1
Pressure 1
p
2
Pressure 2
The pressures applied are transferred from the process membrane of the diaphragm seal
to the internal process membrane of the measuring cell by means of an incompressible fill
fluid, causing a deflection of the process membrane on both sides. A second fill fluid
transfers the pressure to a side of the measuring element where a resistance bridge is
located (semiconductor technology). The differential pressure-dependent change in the
bridge output voltage is measured and processed further.