Patent ID: 9451339
Filing Date: 2016-09-20
CPC Classification: G06K,H04Q

Claim Text:
1. A sensor transmitter for communicating wirelessly a presence of a condition within a metal enclosure, comprising: a power supply; at least one sensor, individual ones of the at least one sensor senses a presence of a condition; a low frequency generator positioned within a metal enclosure and electrically coupled to the power supply and the at least one sensor, the low frequency generator transmits a low frequency wireless signal of less than about 100 kHz indicative of the presence of the condition within the metal enclosure when the condition is present at the individual ones of the at least one sensor; a comparison device electrically coupled between the at least one sensor and the low frequency generator; and a magnetic field sensor electrically coupled between the power supply and the comparison device such that the sensor transmitter is not able to transmit the low frequency wireless signal indicative of the presence of the condition within the metal enclosure until the magnetic field sensor is placed within a magnetic field.