Procedure for regulating the temperature of a material to be processed in a processing chamber and device to accomplish this

US6173903A · kind A · utility

Assignee

• Kendro Laboratory Products, Inc. · US

Inventors

• Helmut Loscher · Nidderau, DE
• Hubert Heeg · Mömbris, DE

Key dates

• Filing date: Dec 18, 1998
• Grant date: Jan 16, 2001
• Expiry date: Dec 18, 2018

Classification

• Technology area (CPC G): Physics
• CPC primary: G05B9/03
• WIPO field: Control
• WIPO sector: Instruments

Abstract

To regulate the temperature in the processing chamber of an incubator with a fault protection function, two temperature sensors are provided to measure actual temperatures or rather sensor signals, and they and their associated peripherals undergo a plausibility check during which the sensor signals may not exceed a specified difference. if the plausibility condition is met and if an error in the feedback control circuit, for example a permanently closed contact of the temperature stabilization actuator, should cause the temperature sensor signal value (actual value) to exceed or fall below a specified error tolerance band about a desired value, then control is transferred from a first feedback control circuit to a primary feedback control circuit with a controller/monitoring device.