Failure protection in temperature control

Details Failure protection in temperature control Failure protection in temperature control

1986-02-27

1987-06-30

Paschall, M. H.

Electric heating

Heating devices

With current connection and/or disconnection means

219494, 219497, 340640, H05B 102

Patent

active

046772820

ABSTRACT:
A triac and a mechanical relay, in series with the electrical heater of an incubator, together switch heater current on and off at the same set point temperature if the triac fails short. Similarly, a second mechanical relay in parallel with the triac switches heater current around the triac, should the triac fail open.

REFERENCES:
patent: 3944893 (1976-03-01), Hayden
patent: 4109134 (1978-08-01), Van Herten
patent: 4393300 (1983-07-01), Proctor
patent: 4421976 (1983-12-01), Jurek
patent: 4485296 (1984-11-01), Ueda et al.

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