Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2008-04-05
2010-11-16
Mehmood, Jennifer (Department: 2612)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S611000, C062S127000, C062S129000
Reexamination Certificate
active
07834772
ABSTRACT:
A monitoring system for monitoring an air-conditioner may include a pressure sensor for detecting the pressure of the fluid of the air-conditioner, a power sensor for detecting the presence of supply voltage supplied to the air-conditioner and applied voltage which is applied to the air-conditioner, an activation device to activate an alarm based upon the detection of the pressure from the pressure sensor, the detection of the supply voltage to the air-conditioner and the detection of the applied voltage to the air-conditioner. The activation device may be activated based only on the loss of pressure detected by the pressure sensor, and the activation device may not be activated if the supplied voltage is detected. The activation device may be activated when both the supplied voltage is detected and the applied voltage is not detected, and the activation device may be connected to a disconnect switch to detect the supplied voltage. The activation device may include a first match resistor to complete a closed loop circuit to the alarm system, and the activation device may include a second match resistor which is approximately the same impedance as the first match resistor.
REFERENCES:
patent: 5508568 (1996-04-01), Mammen
patent: 6738645 (2004-05-01), Knight
patent: 2002/0154001 (2002-10-01), Tan et al.
patent: 2003/0201892 (2003-10-01), Chance et al.
patent: 2009/0077984 (2009-03-01), Tidrick
patent: 2009/0160661 (2009-06-01), Hardin
Mehmood Jennifer
Swayze, Jr. Wilson Daniel
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