JPS5855442B2 - Ondo Kenshiyutsuki no Retsuka Kajidou Kenyutsuhouhou - Google Patents

Description

[Detailed Description of the Invention] Conventionally used non-contact temperature detectors that utilize radiant energy are easily affected by the environment in which they are used, and deteriorate in a short period of time, especially when used in locations with a lot of gas, dust, etc. However, the disadvantage is that the measured values change over time and are unreliable.

However, in the past, there has been no device or method for automatically detecting the unacceptable degree of deterioration of this type of temperature detection, and the reality is that maintenance and inspection thereof has been dependent on the intuition of employees.

In view of these circumstances, the present invention provides a method for automatically detecting unacceptable deterioration of this type of temperature detector, thereby making it possible to always use this type of temperature detector in a reliable state. This also aims to ensure that maintenance and inspections are carried out reliably.

The present invention will be explained according to embodiments shown in the drawings.

In the figure, 1 indicates a temperature-measuring object.

The temperature of the object to be measured 1 is detected by temperature detectors 2 and 3 that are configured to have different degrees of deterioration due to the influence of the environment.

In this case, if a known total radiation thermometer is used as the temperature detectors 2 and 3, for example, the temperature detector 2
As the temperature sensor 3, a sensor is used which is provided with a shutter that opens the detection section at a certain time interval, for example, once every 10 minutes, and as a temperature sensor 3, one that does not have any shutter or the like mounted on the detection section is used.

In such a case, if temperature detection of the object to be measured 1 is started simultaneously by temperature detectors 2 and 3, the detection part of temperature detector 3 will be directly exposed to the outside air during temperature detection. On the other hand, since the detection part of temperature sensor 2 is only exposed to the outside intermittently by the shutter, temperature sensor 3 is more affected by the gas and dust in the outside air than temperature sensor 2. It is also subject to more deterioration over time.

The temperature signals detected by temperature detectors 2 and 3 are amplified in a predetermined manner (amplified) by intensifiers 4 and 5, respectively, and then provided to a differential amplifier 7.

The differential amplifier 7 calculates the difference between the temperature signals sent from the amplifiers 4 and 5, and outputs the difference to the determination circuit 8.

In the determination circuit 8, when the difference between the temperature signals is within a predetermined range, the determination circuit 8 does not output the signal to the alarm circuit 9;
When the above specified range is exceeded, this is detected and an alarm circuit is activated.
Alternatively, it is output to the recording circuit 9 to issue an alarm or record it.

In this way, while the degree of deterioration of the temperature sensor 3 is within the allowable range, the temperature information of the object to be measured 1 detected by the temperature sensor is used as is for the predetermined purpose 6. However, when the degree of deterioration of the temperature detector 3 exceeds the unacceptable range compared to that of the temperature detector 2, the determination circuit 8 determines this, and the alarm circuit 9 issues an alarm, and the temperature detector 3 It also encourages the exchange of

In the above embodiment, for example, total radiation thermometers having the same configuration are used as the temperature detectors 2 and 3, and the degree of deterioration of the temperature detector 2 due to outside air is compared with that of the temperature detector 3 using a shutter etc. We have previously described an example in which unacceptable deterioration of temperature detector 3 is detected based on the difference in the measured temperatures between temperature detectors 2 and 3. Two different types of temperature detectors are used, namely, temperature detector 2 is a well-known two-color thermometer which is relatively less affected by the environment, and temperature detector 3 is a known two-color thermometer which is less affected by the environment. Using a radiation thermometer, when the measured temperature difference between the two exceeds a predetermined range, the judgment circuit 8
It is also possible to detect this and warn of unacceptable deterioration of the temperature detector 3.Also, the object of the present invention can be similarly achieved by combining a total radiation thermometer with a temperature detector such as a thermocouple or a thermistor. can be reached.

[Brief explanation of drawings]

The figure is a block diagram showing an embodiment of the present invention. 1... Temperature measuring object, 2, 3... Temperature detector.

Claims (1)

[Claims] 1 The temperature of the object to be measured is detected by temperature detectors configured to have different degrees of deterioration over time, and by detecting that the detected temperature difference between the temperature detectors exceeds a predetermined range. A method for automatically detecting deterioration of a temperature sensor, which detects deterioration of a temperature sensor.