Tamper protection for an automatic remote meter reading unit

Details Tamper protection for an automatic remote meter reading unit Tamper protection for an automatic remote meter reading unit

1980-09-02

1982-11-02

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

With particular system function

340512, 34087002, 34087009, G08B 2100

Patent

active

043576010

ABSTRACT:
In an automatic remote meter reading system, a tamper protection circuit (101) provides an alarm signal at a central station upon the disconnecting or tampering with a remote utility meter (100). Tamper protection is provided for the meter and for the transmission line carrying energy usage information to a transponder (500) such that any interruptions of the circuit path causes an alarm to be generated. The circuitry includes a remote resistance (132) associated with each meter to be protected. The value of the remote resistance is continually compared with a resistance (110) having a given value within the tamper protection circuit such that for any changes in the value of the remote resistance, an imbalance in the tamper circuit occurs and the alarm signal is generated.

REFERENCES:
patent: 3440636 (1969-04-01), Sliman
patent: 3668681 (1972-06-01), Kaplan
patent: 4032916 (1977-06-01), Galvin et al.

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