User Manual Owner's manual

126 Rockwell Automation Publication PROCES-UM002A-EN-P - July 2014

Appendix I Deltabar S Differential Pressure

Metal Measuring Cell

Metallic measuring diaphragms are used for the Deltabar S PMD75. The

separating diaphragms (3/9) are deflected on both sides by the acting pressures. A

filling oil (4/8) transfers the pressure to a resistance circuit bridge (semi-

conductor technology). The differential-pressure-dependent change of the

bridge output voltage is measured and further processed.

The following is an example of metal measuring cell 10 mbar and 30 mbar.

The following is an example of metal measuring cell as of 100 mbar.

Item Description

1 Sensing element

2 Silicon diaphragm

3 Separating diaphragm

4Filling oil

5 Integrated overload protection

Item Description

6 Sensing element

7 Overload diaphragm/Middle diaphragm

8Filling Oil

➂

➃

➄

➀

➁

➆

➇

➈

➅