Indicator and limit value alarm device

Details Indicator and limit value alarm device Indicator and limit value alarm device

1979-04-05

1981-02-17

Caldwell, Sr., John W.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Using radiant energy

324103P, 324122, 340511, 340661, 340715, 340753, G01R 1300, G08B 2100

Patent

active

042517699

ABSTRACT:
The present electronic indicator or display device is equipped with adjustable upper and/or lower limit value markers to provide a respective alarm if such limit values are exceeded or not reached. The display itself comprises an electronic circuit and optical display elements such as light emitting diodes connected to the display circuit. An input to the display circuit is adapted to receive rated or limit value input signals which are displayed as respective markers and the position of which is adjustable. A time multiplexing circuit controls the timed sequence of the signals supplied to the display elements. A comparator compares the measured signal value with the rated value or values and monitors the proper function of the system.

REFERENCES:
patent: 2593204 (1952-04-01), Schwartzberg
patent: 2705902 (1955-04-01), Blowney
patent: 3914758 (1975-10-01), Ingle
patent: 3922640 (1975-11-01), Ruof
patent: 4001699 (1977-01-01), Denny et al.
patent: 4155084 (1979-05-01), Klees
patent: 4200896 (1980-04-01), Baumann
"Analog Meter has LED Display", Under New Products, Electronics, Mar. 17, 1977.

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