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Pressure transducer provided with a piezoelectric element for the detection of errors in separation membranes

A measurement converter and electrical measurement technology, applied in the direction of measuring fluid pressure through electromagnetic components, measuring devices, measuring fluid pressure, etc., can solve problems such as hindering pressure and wrong measurement, and achieve reliable judgment and reliable measurement values.

Active Publication Date: 2006-10-18
SIEMENS SENSORS & COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This can have serious consequences in process technology plants
In addition, pressure transmission to the sensor may be hindered by deposits of the measuring medium on the diaphragm
This results in erroneous measurements that are difficult for the user to determine

Method used

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  • Pressure transducer provided with a piezoelectric element for the detection of errors in separation membranes
  • Pressure transducer provided with a piezoelectric element for the detection of errors in separation membranes

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Embodiment Construction

[0015] figure 1 The circuit block diagram of the pressure measurement transducer is shown. The pressure measuring transducer has an essentially rotationally symmetrical measuring cell 1 with a housing 2 in which a pressure sensor 3 is arranged for converting the pressure to be measured into an electrical measuring signal 4 . The pressure sensor 3 is located between the measuring chamber 5 and the channel 6 for introducing a reference pressure. The measuring chamber 5 is filled with silicone oil as a pressure transmitting liquid. Air is led through channel 6 to pressure sensor 3 at the prevailing ambient pressure. In the embodiment shown, measurement signal 4 thus reproduces an absolute pressure which is dependent on the ambient pressure. To protect the sensor, the pressure-transmitting liquid is separated in the measuring chamber by a diaphragm 7 from the process medium 8 , which is introduced into the pressure-measuring cell 1 through a channel at the pressure to be measur...

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Abstract

The invention relates to a pressure measuring transducer having a measuring chamber which is separated from the medium to be measured by a diaphragm. A piezoelectric element is arranged on the silicone oil-filled measuring chamber, by means of which the volume of the measuring chamber can be purposefully varied. The resulting measurement signal curve ( 23 ) is compared with the reference curve, and a film fault is concluded in the event of a significant deviation. The state of the diaphragm ( 7 ) can thus be monitored in the state in which the diaphragm ( 7 ) is installed in the pressure measuring transducer.

Description

technical field [0001] The invention relates to a pressure measuring transducer with a pressure sensor installed in a housing for converting a pressure to be measured into a measurement signal according to the general concept of claim 1 . Background technique [0002] Such a pressure measuring transducer is known from DE 3705901 C2, with which the absolute or differential pressure of a process medium can be measured. Therein a pressure measuring cell is disclosed which has a housing in which a measuring membrane is arranged which divides the space within the housing into a measuring chamber and a reference chamber. The measuring chamber and the reference chamber are each provided with pressure channels which, in the case of pressure measuring cells, in a differential pressure measuring transducer each lead to a diaphragm separating the measuring or reference chamber from the measuring medium on which Measures the pressure difference between different measuring points. Both...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L27/00G01L9/00
CPCG01L19/0645G01L27/007
Inventor 汉斯-乔格·孔普夫米勒
Owner SIEMENS SENSORS & COMM
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