Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1989-10-31
1992-02-04
Ng, Jin F.
Communications: electrical
Condition responsive indicating system
Specific condition
324110, G08B 2100
Patent
active
050862928
ABSTRACT:
A system for detection of tampering with a utility meter provides not only an indication that tampering has occurred but also sufficient information to enable an estimation of actual consumption to be made as opposed to the tampered metered consumption. The device includes a plurality of tampering sensors sensing tilt, electric field, magnetic field, temperature, sound, reverse rotation of a moving element and excessive difference between metered consumption and an approximate actual consumption. The device also measures the movement of the moving element. These sensed signals are recorded in sequential time periods of for example eight hours so that an analysis can be made on a daily basis to provide an accurate pattern of consumption as opposed to the tampered meter consumption pattern.
REFERENCES:
patent: 4321531 (1982-03-01), Marshall
patent: 4331915 (1982-05-01), Fielden
patent: 4357601 (1982-11-01), McWilliams
patent: 4654662 (1987-03-01), Van Orsdel
patent: 4670737 (1987-06-01), Rilling
patent: 4707679 (1987-11-01), Kennon et al.
patent: 4866761 (1989-09-01), Thornboroug et al.
Johnson Dennis F.
Wiebe Michael
Ade Stanley G.
Battison Adrian D.
Iris Systems Inc.
Jackson Jill
Ng Jin F.
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