Title:
TEMPERATURE CONTROL SYSTEM
Document Type and Number:
Japanese Patent JPH02140812
Kind Code:
A
Abstract:
PURPOSE:To obtain more satisfactory control accuracy by obtaining the deteriorated quantity of a main temperature detection element from related data of a setting initial value between the main temperature detection element and an auxiliary temperature detection element and similar related data which changes in terms of time lapse. CONSTITUTION:In a protection tube 12, a part including a terminal part 12a is exposed to the outer part (air) of a furnace wall 11, and a main thermocouple for measurement 14, an auxiliary thermocouple 16 measuring the air and an auxiliary thermocouple 15 provided between them are disposed in the protection tube 12. A controller (not shown in figure) fetches three inputs of the main thermocouple 14, the auxiliary thermocouples 15 and 16 and the main thermocouple 14 performs control. The deterioration of the thermocouple 14 for control is detected from initial related data between the main thermocouple 14 and two auxiliary thermocouples 15 and 16, and present related data used for a long time, and a correction signal or a deterioration always is outputted. Thus, more satisfactory control accuracy can be obtained.
Inventors:
SHIMIZU OSAMU
Application Number:
JP29540388A
Publication Date:
May 30, 1990
Filing Date:
November 22, 1988
Export Citation:
Assignee:
OKURA DENKI CO LTD
International Classes:
G05B23/02; G05D23/00; G05D23/19; G05D23/22; G05D23/24; (IPC1-7): G05B23/02; G05D23/00; G05D23/19; G05D23/22; G05D23/24
Attorney, Agent or Firm:
Yutaro Kumagai