Apparatus for monitoring the operation of heater controllers

Details Apparatus for monitoring the operation of heater controllers Apparatus for monitoring the operation of heater controllers

1974-02-15

1976-07-06

Caldwell, John W.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340213Q, 340253P, 219502, 250215, G08B 2100

Patent

active

039684890

ABSTRACT:
Circuitry is disclosed that monitors the frequency at which a heater controller applies pulses to a heater to determine if the heater controller is operating properly. If the heater controller fails to generate a pulse in a selected interval, the circuitry generates a signal that activates an alarm and interrupts the operation of a machine that is processing material heated by the heater.

REFERENCES:
patent: 3541429 (1970-11-01), Martin
patent: 3548155 (1970-12-01), Rabindran
patent: 3586830 (1971-06-01), Leitner
patent: 3718924 (1973-02-01), Trubert et al.
patent: 3725684 (1973-04-01), Bourgoin et al.

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