Electronic monitoring system

Claim 1

In a refrigerated trailer which includes a refrigeratable compartment and an engine to drive a refrigerating compressor, an electronic monitoring system comprising: A sensor circuit having interconnected means for setting: an on-off condition of the system, a temperature control device, an engine pre-heat switch, an engine stop switch, a central alarm switch, and a security switch, the sensor circuit being adapted for sensing a status of a plurality of conditions of the refrigeration system and transmitting conditions of the system to a chosen location, including the conditions of: security of the refrigerated trailer system, water temperature of the engine, water level of the engine, oil pressure of the engine, voltage level of a battery of the engine, temperature of the refrigerated compartment, refrigeration compressor cycle, running time of the engine, and thermostat control setting, the sensor circuit also including interconnected logic circuit means for developing a controlling signal upon detection of an undesirable status within any portion of the sensor circuit, the sensor circuit further adapted to include a thermostat positionable on the refrigerating unit, wherein the thermostat is remotely adjustable in addition to being manually adjustable. alarm means adapted to react in reference to the controlling signal, and transponding means adapted to transmit a signal from the alarm means.