Diagnostic device and diagnostic method

Patent metadata

Field	Value
Publication number	US-11913844-B2
Application number	US-202117202497-A
Country	US
Kind code	B2
Filing date	Mar 16, 2021
Priority date	Mar 27, 2020
Publication date	Feb 27, 2024
Grant date	Feb 27, 2024

Abstract

A diagnostic device of a first thermocouple, the diagnostic device includes: a controller that acquires a first measurement value of the first thermocouple each time current passes through the first thermocouple and determines, in a first predetermined cycle and based on the acquired first measurement value, a presence of a disconnection risk that the first thermocouple will disconnect from the diagnostic device; and an output unit that outputs a first alarm indicating the disconnection risk based on a result of the determination by the controller.

First claim

What is claimed is:

1. A diagnostic device of a first thermocouple, the diagnostic device comprising:
a controller that:
acquires a first measurement value of the first thermocouple each time a current passes through the first thermocouple, and
determines, in a first predetermined cycle and based on the acquired first measurement value, a presence of a disconnection risk that the first thermocouple will disconnect from the diagnostic device; and

an output unit that outputs a first alarm indicating the disconnection risk based on a result of the determination by the controller, wherein
the controller:
calculates a first average value of a plurality of acquired first measurement values in a predetermined interval, and
determines, based on the first average value, whether the disconnection risk is present.

2. The diagnostic device according to claim 1 , wherein
the controller determines that:
the disconnection risk is present when the first average value exceeds a first threshold, and
the first thermocouple is disconnected when the first average value exceeds a second threshold, and

the output unit outputs a second alarm indicating disconnection of the first thermocouple when the controller has determined that the first thermocouple is disconnected.

3. The diagnostic device according to claim 1 , wherein the output unit outputs an alarm indicating an abnormality when the controller has determined that a difference between any of the first measurement values and the first average value exceeds a predetermined value.

4. The diagnostic device according to claim 1 , wherein the controller further:
acquires a second measurement value of a second thermocouple each time a current passes through the second thermocouple,
calculates a second average value of a plurality of acquired second measurement values in the predetermined interval, and
determines the disconnection risk based on the first average value and the second average value.

5. The diagnostic device according to claim 4 , wherein the second thermocouple measures a temperature of the same location as the first thermocouple.

6. The diagnostic device according to claim 5 , wherein the controller further determines that the disconnection risk is present when the first average value exceeds a threshold.

7. A diagnostic device of a thermocouple, the diagnostic device comprising:
a controller that:
acquires a measurement value of the thermocouple each time a current passes through the thermocouple, and
determines, in a first predetermined cycle and based on the acquired measurement value, a presence of a disconnection risk that the thermocouple will disconnect from the diagnostic device; and

an output unit that outputs an alarm indicating the disconnection risk based on a result of the determination by the controller, wherein
when the controller has determined that the disconnection risk is present, the controller determines a second predetermined cycle shorter than the first predetermined cycle.

8. A diagnostic device of a thermocouple, the diagnostic device comprising:
a controller that:
acquires a measurement value of the thermocouple each time a current passes through the thermocouple, and
determines, in a predetermined cycle and based on the acquired measurement value, a presence of a disconnection risk that the thermocouple will disconnect from the diagnostic device; and

an output unit that outputs an alarm indicating the disconnection risk based on a result of the determination by the controller, wherein
the controller gradually shortens the predetermined cycle when the controller has determined that the disconnection risk is present.

9. A diagnostic method of a thermocouple, the diagnostic method comprising:
acquiring a measurement value of the thermocouple each time a current passes through the thermocouple;
determining, in a predetermined cycle and based on the acquired measurement value, a presence of a disconnection risk that the thermocouple will disconnect from a diagnostic device;
outputting an alarm indicating the disconnection risk based on a result of the determination;
calculating an average value of a plurality of acquired measurement values in a predetermined interval; and
determining, based on the average value, whether the disconnection risk is present.

Assignees

• Yokogawa Electric Corp

Inventors

• Tachibana Takuya

Classifications

• G01K7/026 Primary

  Arrangements for signalling failure or disconnection of thermocouples · CPC title