Metal measuring cell – Rockwell Automation 1734sc-IE4CH E+H Instruments via HART to PlantPAx User Manual User Manual
Page 126
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
4
Filling oil
5
Integrated overload protection
Item
Description
6
Sensing element
7
Overload diaphragm/Middle diaphragm
8
Filling Oil
➂
➃
➄
➀
➁
1
p
2
p
1
p
2
p
➆
➇
➈
➅