AC electric energy meter having shielded radiation responsive da

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Combined

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Details

34087002, 346 14MR, G01R 1104, H04B 900, G08C 906

Patent

active

045845271

ABSTRACT:
A watt-hour metering system includes a meter enclosed in a transparent cover and having an electronic register with a multichannel infra-red responsive data I/O port, and a portable electronic programmer/reader having a complementary infra-red data I/O port. The meter includes a pivoting shutter inside the cover having a pair of magnets affixed thereto and held by gravity in a position to shield at least one channel of the I/O port from radiation entering the cover. An activating magnet is affixed to the programmer/reader such that when the programmer/reader is placed against the meter cover, magnetic flux is coupled to the shutter magnets to cause the shutter to pivot and permit the transmission of infra-red radiation between the I/O port and the programmer/reader. Alternatively, a shutter is pivotally secured to the cover and manually operable from outside the cover to selectively permit and prevent transmission of radiation between the I/O port and programmer/reader.

REFERENCES:
patent: 3748654 (1973-07-01), Sutherland
patent: 4298839 (1981-11-01), Johnston
patent: 4332450 (1982-06-01), Griffith
patent: 4491792 (1985-01-01), Bullock et al.

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