Tamperproof non-contact switch

Details Tamperproof non-contact switch Tamperproof non-contact switch

2011-05-24

2011-05-24

Wu, Daniel (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S541000, C340S542000, C340S545600, C340S551000, C340S561000, C340S565000, C340S567000, C340S568100, C335S206000, C335S207000

Reexamination Certificate

active

07948378

ABSTRACT:
A non-defeatable magnetically actuatable switch device is shown and described for restricting access to industrial controls. The non-contact switch device employs one or more non-contact access switches, and an access key removably disposed in close proximity to each access switch. Removal or installation of an access key alters the electrical state of a corresponding access switch. A connected control unit determines a mode of operation, or grants permissions, based on the combination of access keys that are present or absent from the device. A lockable or sealable cover is provided over the access keys to limit unauthorized access. A tamper detection switch is also provided for the sole purpose of identifying foreign magnetic sources in the vicinity of the access switches to ensure that the device is non-defeatable. Furthermore, all access and tamper detection switches are magnetically actuatable and thus provide a completely contact-free means of securing and restricting access to sensitive controls and parameters.

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