Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1994-12-21
1996-06-04
Allen, Stephone
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
324110, 340568, G08B 13184
Patent
active
055235590
ABSTRACT:
A method and system is disclosed for indication and prevention of tampering with an electricity meter having control circuitry for automatic remote reading. The control circuitry, provided externally of the meter in a base or base extension, to which the meter is connected, is also used for tamper detection. Embodiments of the invention include use of optical sensing, voltage detection and proximity detection. Ambient light sensing may be performed to detect separation of the meter from the external receptacle. Reflected light to a reflective surface of the meter is sensed to determine if the meter is properly engaged. Presence of a meter connection plug element may be sensed either optically or by position responsive switch. Voltage of the utility supply and meter user output may be monitored to determine tampering.
REFERENCES:
patent: 4571691 (1986-02-01), Kennon
patent: 5202673 (1993-04-01), Conrad
patent: 5216246 (1993-06-01), Weldman et al.
patent: 5293115 (1994-03-01), Swanson
patent: 5422565 (1995-06-01), Swanson
Allen Stephone
Lee John R.
Schlumberger Industries Inc.
Smith Keith G. W.
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