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Magnetic field sensor

  • US 10,249,161 B2
  • Filed: 07/25/2014
  • Issued: 04/02/2019
  • Est. Priority Date: 07/25/2014
  • Status: Active Grant
First Claim
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1. A magnetic field sensor comprising:

  • a housing having a lid;

    a tamper switch which detects when the lid of the housing is opened;

    a device which senses a presence or an absence of a magnetic field;

    a power source, the magnetic field sensor being powered up when the lid of the housing is removed and the power source is inserted into the housing;

    a microprocessor, a signal being sent by the tamper switch to the microprocessor when the lid of the housing is open, and a signal being sent by the device to the microprocessor when a magnetic field is sensed; and

    an indicator which indicates the presence or the absence of a magnetic field, wherein the power source supplies current to the indicator, and the indicator turns on when a magnetic field is sensed and turns off when a magnetic field is not sensed; and

    wherein the indicator is initially operable following the power source being inserted into the housing and the magnetic field sensor being powered up, and the microprocessor renders the indicator inoperable a predetermined period of time after the lid of the housing is closed following the power source being inserted into the housing and the magnetic field sensor being powered up, and the indicator remaining inoperable until the lid of the housing is removed and the lid of the housing is closed again at which point the indicator is operable until the microprocessor again renders the indicator inoperable a predetermined period of time after the lid of the housing is closed again.

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