Proportional temperature control of a sterilizer

Details Proportional temperature control of a sterilizer Proportional temperature control of a sterilizer

1991-02-01

1992-11-17

Kummert, Lynn M.

Chemical apparatus and process disinfecting, deodorizing, preser

Control element responsive to a sensed operating condition

Control element responds proportionally to a variable signal...

422 26, 422 28, 422307, 436 55, 219395, 219401, 219406, 219413, G05D 2300

Patent

active

051641615

ABSTRACT:
Apparatus and methods for proportional control of heating of a sterilizer chamber are disclosed in the application. A sterilizer chamber has heaters mounted on the walls, a wall temperature sensor and a chamber temperature sensor. The controller is operable to adjust the heat input by turning on the heaters for a variable fraction of a selected fixed interval and off for the remainder of the interval. When on the heaters provide a substantially constant heat input per unit time. The fraction of the interval during which the heaters are on is proportional to a temperature differential which comprises a setpoint temperature minus a temperature reading from one of the sensors. The controller has two, or in an alternate embodiment three, operating modes each having a unique temperature differential.

REFERENCES:
patent: 3278256 (1966-10-01), Skaller
patent: 4309381 (1982-01-01), Chamberlain et al.
patent: 4447399 (1984-05-01), Runnells et al.
patent: 4865814 (1989-09-01), Childress

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