Title:
THERMOELECTRIC THERMOMETER
Document Type and Number:
Japanese Patent JP3254669
Kind Code:
B2
Abstract:
PURPOSE: To enhance calibrating accuracy by embedding a pair of temperature sensors uniform in a characteristic in an input terminal stand to which a thermocouple is connected, and constituting so that one temperature sensor output is pulled outside for cold junction temperature compensating operation and the other for calibration.
CONSTITUTION: When a thermometer is calibrated, a male (a) and a female (b) of connectors 41 and 42 are joined together, and a thermoelectric thermometer and a voltage generator 200 are connected to each other, and a switch 50 is connected to the connecting B side. Therefore, an electric signal corresponding to a temperature of an input terminal stand 30 detected by a temperature sensor 33 is added to a cold junction temperature compensating circuit 201 of the generator 200 through the connector 41. Voltage is generated in a voltage generating circuit 203 since a cold junction temperature caused by a temperature of the terminal stand 30 obtained by the circuit 201 set by a temperature setting part 202 is compensated. The generated voltage is taken out of a terminal 206 through an output amplifier 204. The taken-out voltage is amplified, and is converted by an A/D converter 21, and is displayed by a display unit 25.
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Inventors:
Koichiro Gemma
Application Number:
JP3803595A
Publication Date:
February 12, 2002
Filing Date:
February 27, 1995
Export Citation:
Assignee:
Yokogawa Electric Corporation
International Classes:
G01K7/13; G01K15/00; (IPC1-7): G01K7/13; G01K15/00
Domestic Patent References:
| JP546592A | ||||
| JP195641U | ||||
| JP5526422U |