Data processing: measuring – calibrating – or testing – Measurement system – Pressure
Reexamination Certificate
2007-08-21
2007-08-21
Wachsman, Hal (Department: 2863)
Data processing: measuring, calibrating, or testing
Measurement system
Pressure
C073S706000, C073S707000, C073S708000, C073S001220, C073S001220, C340S608000, C340S609000, C340S610000, C340S611000, C340S626000, C137S554000, C137S557000
Reexamination Certificate
active
11442573
ABSTRACT:
A pressure detector for detecting a high side pressure from a high pressure side impulse line and a low side pressure from a low pressure side impulse line includes a high side pressure variance calculating section for calculating a high side pressure variance from a high side pressure fluctuation calculated from a high side pressure signal, a low side pressure variance calculating section for calculating a low side pressure variance from a low side pressure fluctuation calculated from a low side pressure signal, a rate calculating section for calculating a variable according to a ratio of the high side pressure variance to the low side pressure variance, and a determining section for determining blockage of the high pressure side impulse line or blockage of the low pressure side impulse line based on a value of the variable.
REFERENCES:
patent: 5680109 (1997-10-01), Lowe et al.
patent: 2004-132817 (2004-04-01), None
patent: 2005-274501 (2005-10-01), None
Amadi-Echendu, et al., “Signal Analysis Applied to Detect Blockages in Pressure and Differential Pressure Measurement Systems,” IEEE, pp. 741-744 (1994).
Extended European Search Report dated Sep. 20, 2006.
Hashizume Takumi
Miyaji Nobuo
Wakui Tetsuya
Edwards Angell Palmer & & Dodge LLP
Kundu Sujoy
Penny, Jr. John J.
Wachsman Hal
Yokogawa Electric Corporation
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