Apparatus for determining and/or monitoring a process...

Details Apparatus for determining and/or monitoring a process... Apparatus for determining and/or monitoring a process...

2005-05-23

2010-10-26

Chapman, John E (Department: 2856)

Measuring and testing

Instrument proving or calibrating

Liquid level or volume measuring apparatus

C073S001830

Reexamination Certificate

active

07818990

ABSTRACT:
An apparatus for determining and/or monitoring at least one process variable of a medium, and includes a sensor unit, a feedback electronics and a supplemental electronics. The sensor unit, feedback electronics and supplemental electronics form a first oscillatory circuit, which oscillates with at least one resonance frequency (ω1) and/or with a resonance frequency (ωres) within at least one resonance frequency range. The feedback electronics and the supplemental electronics form a second oscillatory circuit, which oscillates at a resonance frequency (ωcablebreak), which differs from the resonance frequency (ωres, ω1) of the first oscillatory circuit.

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patent: 5777550 (1998-07-01), Maltby
patent: 44 38 879 (1996-02-01), None
patent: 198 35 370 (2000-02-01), None
patent: 100 23 305 (2001-11-01), None
patent: 0 810 423 (1997-12-01), None

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