Hazard prevention circuit for immersion heaters

Details Hazard prevention circuit for immersion heaters Hazard prevention circuit for immersion heaters

1977-06-27

1978-07-25

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

361178, 219322, 219328, 219331, 219335, 219481, 340604, 340640, H02H 504

Patent

active

041033191

ABSTRACT:
A hazard prevention control circuit is provided for an electric heater having heating coils enclosed in a quartz tube immersed in a tank of solution. A circuit breaker is connected in series with a contactor coil controlling a set of contacts connecting the main lines of a power supply to the heating coils of the heater. Upon sensing a hazard condition, the control circuit causes excess current to flow through the circuit breaker to open the circuit and deenergize the contactor coil so as to open the contacts connecting the power to the heating coils. Transformers are provided for coupling power supplied by the main lines to the control circuit and the contactor coil and for coupling the pulse output of the control circuit to trigger a triac which conducts the excess current through the circuit breaker. These transformers serve to isolate the heating equipment as a safety precaution for the operator and to prevent the electronic components of the control circuit from being destroyed before the circuit breaker disconnects the power.

REFERENCES:
patent: 3119953 (1964-01-01), Kendall
patent: 3525902 (1970-08-01), Davidson et al.
patent: 3766358 (1973-10-01), Gass-Erb
patent: 3846615 (1974-11-01), Athey et al.
patent: 3983361 (1976-09-01), Wild et al.
patent: 4037080 (1977-07-01), Owen

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