Patent · US Active

Apparatus for determining and/or monitoring a process variable

US8746071B2 · kind B2 · utility

1Cited by

6References

10Claims

0Family size

Assignee

ENDRESS+HAUSER GMBH+CO.KG · DE

Inventors

Volker Dreyer · Lörrach, DE
Sergej Lopatin · Lörrach, DE
Oliver Schmidt · Erlangen, DE

Key dates

Filing date	Oct 27, 2009
Grant date	Jun 10, 2014
Priority date	—
Expiry date	Feb 2, 2031

Classification

Technology area (CPC G)Physics
CPC primaryG01N2291/02836
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

An apparatus for determining and/or monitoring a process variable. The apparatus includes a housing, a mechanically oscillatable unit, and a transducer unit, which is arranged and clamped between two housing elements in such a manner that a predeterminable pressure acts on the transducer unit along an imaginary axis. An equalizing element is provided, whose coefficient of thermal expansion and/or height are/is selected in such a manner that a temperature-related expansion of the equalizing element during a temperature-related expansion of a housing element to be compensated leads to the pressure acting on the transducer unit being greater than or equal to a predeterminable prestress limit value.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.