Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2007-10-19
2010-06-29
Zimmerman, Brian A (Department: 2612)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S661000
Reexamination Certificate
active
07746243
ABSTRACT:
A pump failure alarm device includes two digital-analog converting circuits (100, 110), a voltage sampling circuit (120), a controlling circuit (130), an I/O controller (U11), and an alarm circuit (140). The digital-analog converting circuits receive digital pulse signals from two pumps (200, 210), and respectively output a DC voltage signal at an output terminal when the pumps run normally. The voltage sampling circuit with two input terminals respectively coupled to the output terminals of the two digital-analog converting circuits, and outputs a first voltage signal when the two pumps run normally and outputs a second voltage signal when either or both of the pumps stop running. The controlling circuit receives the voltage signals from the voltage sampling circuit, and outputs a first control signal when it receives the first voltage signal and outputs a second control signal when it receives the second voltage signal. The I/O controller receives the control signals from the controlling circuit, and outputs an alarm signal when it receives the second control signal. The alarm circuit receives the alarm signal from the I/O controller, and activates an alarm.
REFERENCES:
patent: 4228427 (1980-10-01), Niedermeyer
patent: 5448175 (1995-09-01), Nishibe et al.
patent: 5534854 (1996-07-01), Bradbury et al.
patent: 5677672 (1997-10-01), Vogt et al.
patent: 5745041 (1998-04-01), Moss
patent: 6254767 (2001-07-01), Shin et al.
Chen Ying
Xiong Jin-Liang
Hon Hai Precision Industry Co. Ltd.
Hong Fu Jin Precision Industry ( ShenZhen) Co., Ltd.
Niranjan Frank R.
Yang James
Zimmerman Brian A
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