Proportional temperature control of a sterilizer
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United States of America Patent
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-
Nov 17, 1992
Grant Date -
N/A
app pub date -
Feb 1, 1991
filing date -
Feb 1, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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