Wiring structure and wiring method for handheld temperature measuring instrument and handheld temperature measuring instrument

Abstract

The invention discloses a handheld temperature measuring instrument wiring structure, a wiring method and a handheld temperature measuring instrument, and relates to the field of temperature measurement, the handheld temperature measuring instrument wiring structure comprises an interface, a copper wire, a temperature sensor and a thermocouple binding post; the interface is arranged on the temperature measuring instrument; the copper wire and the temperature sensor are connected with the temperature measuring instrument through interfaces. The copper wire is connected with a thermocouple binding post and is used for connecting thermocouples with different indexing numbers; the thermocouple binding post serves as a thermocouple reference end; the temperature sensor is used for measuring the temperature of the reference end of the thermocouple. The thermodetector wiring method comprises the steps that an interface is formed in a thermodetector; and an interface is externally connected with a copper lead and a temperature sensor. Various types of thermocouple compensation wires are not needed, the thermocouple reference end can be arranged at any position by adjusting the length of the copper wire according to needs, the length of the precious metal thermocouple is reduced, and the temperature measurement accuracy is effectively improved while the cost is saved.

Description

Technical Field

[0001] The present application relates to the field of temperature measurement, and in particular to a handheld temperature measuring instrument wiring structure, a wiring method and a handheld temperature measuring instrument. Background Art

[0002] The handheld temperature measuring instruments currently used mainly use built-in reference terminals, which have the problem of large reference terminal temperature error and low accuracy of the temperature measuring instrument. In high-temperature measurement, the temperature measuring device cannot be too close to the object being measured, and when using the built-in reference terminal, the length of the thermocouple can only be extended, resulting in the thermocouple of the temperature measuring instrument being too long. When using precious metal thermocouples, the cost is high. Summary of the invention

[0003] The purpose of the present application is to provide a handheld temperature measuring instrument wiring structure, wiring method and handheld temperature measuring instrument, which can improve the accuracy of reference end temperature measurement and reduce the cost of thermocouples.

[0004] To achieve the above objectives, this application provides the following solutions:

[0005] In a first aspect, the present application provides a handheld temperature measuring instrument wiring structure, including: an interface, a copper wire, a temperature sensor and a thermocouple terminal;

[0006] The interface is provided on the temperature measuring instrument; the copper wire and the temperature sensor are connected to the handheld temperature measuring instrument through the interface;

[0007] The copper wire is connected to thermocouples of different graduation numbers through the thermocouple terminal; the thermocouple terminal serves as a thermocouple reference end;

[0008] The temperature sensor is used to measure the temperature of the reference end of the thermocouple.

[0009] Optionally, the interface is a 4-core aviation interface.

[0010] Optionally, the temperature sensor is a two-wire Pt100 platinum resistance thermometer.

[0011] Optionally, two interfaces of the 4-core aviation interface are connected to the copper wire, and the other two interfaces of the 4-core aviation interface are connected to the two-wire Pt100 platinum resistance thermometer.

[0012] Optionally, the wiring structure of the handheld temperature measuring instrument also includes an external sleeve; the thermocouple terminal and the temperature sensor are both arranged inside the external sleeve; the thermocouple terminal is connected to thermocouples of various graduations, and the measuring end of the thermocouple extends to the outside of the external sleeve to measure the temperature of the medium to be measured.

[0013] Optionally, the interface is opened on the top of the handheld temperature measuring instrument.

[0014] In a second aspect, the present application provides a handheld temperature measuring instrument wiring method, comprising:

[0015] Open an interface on the handheld temperature measuring instrument;

[0016] The interface is connected with an external copper wire and a temperature sensor; the copper wire is connected with thermocouples of different graduations through a thermocouple terminal; the thermocouple terminal serves as a thermocouple reference end;

[0017] The temperature of the reference end of the thermocouple is measured by a temperature sensor, and the temperature of the reference end of the thermocouple is transmitted to the temperature measuring instrument through the interface.

[0018] Optionally, the interface is a 4-core aviation interface.

[0019] In a third aspect, the present application provides a handheld temperature measuring instrument, comprising: a housing and a display area;

[0020] An interface is provided on the top of the housing to connect with the temperature sensor through the interface and to connect with the thermocouple terminal through a copper wire;

[0021] The display area is embedded in the housing; the display area is used to display the temperature of the reference end of the thermocouple and the measured temperature.

[0022] Optionally, the handheld temperature measuring instrument further includes a key area; the key area is embedded in the housing and is located below the display area; the key area is used to adjust the working state of the handheld temperature measuring instrument.

[0023] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0024] The present application provides a handheld temperature measuring instrument wiring structure, wiring method and handheld temperature measuring instrument, which use an external reference end, connect an external copper wire and a temperature sensor through an interface, the copper wire is connected to a thermocouple terminal, the thermocouple terminal is a thermocouple reference end connected to thermocouples of different graduations, and the temperature of the thermocouple reference end is measured by a temperature sensor. There is no need to use various types of thermocouple compensation wires. The thermocouple reference end can be set at any position by adjusting the length of the copper wire as needed, thereby reducing the length of the precious metal thermocouple, saving costs and effectively improving the accuracy of temperature measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of the temperature measurement principle of the existing thermocouple;

[0027] Figure 2 A schematic diagram of a handheld temperature measuring instrument provided in accordance with an embodiment of the present application.

[0028] Description of reference numerals:

[0029] 1-interface, 2-temperature sensor, 3-external sleeve, 4-thermocouple wire column, 5-thermocouple measuring end, 6-display area, 7-key area. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0031] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0032] First, let’s introduce the temperature measurement principle of thermocouples:

[0033] like Figure 1 As shown in the figure, two conductors (or semiconductors) A and B made of different materials are welded together to form a closed loop. When there is a temperature difference between the two attachment points of conductor A and conductor B, an electromotive force is generated between the two, thus forming a current of a certain magnitude in the loop. This phenomenon is called the thermoelectric effect, and the thermocouple works by using this thermoelectric effect.

[0034] One end of conductor A and conductor B is welded to form a junction, which is the measuring end and located in the medium to be measured. The other end is connected to a temperature measuring instrument, which is the reference end. The thermocouple composed of two conductors A and B has a measuring end temperature of T1 and a reference end temperature of T0. The thermoelectric potential formed is E AB (T1, T0). Commonly used scales and display instruments are based on the premise that the thermocouple is 0°C. It is necessary to accurately measure the reference end temperature and perform temperature compensation. Therefore, the reference end temperature has a great influence on the accuracy of thermocouple temperature measurement.

[0035] The reference end of existing handheld temperature measuring instruments is generally built-in, and its temperature is close to room temperature when in use. When measured with an ordinary thermometer, the error is large. Therefore, this application uses an external reference end and a 4-core aviation interface, two of which are connected to the thermocouple terminals (the reference end of the thermocouple) with copper wires, and the other two interfaces are used to connect a two-wire Pt100 platinum resistance thermometer to measure the reference end temperature. The temperature measurement accuracy of Pt100 can reach ±0.02°C after correction. Placing the Pt100 platinum resistor and the compensation wire in the same closed space can accurately measure the reference end temperature.

[0036] In an exemplary embodiment, Figure 2 As shown, a handheld temperature measuring instrument wiring structure is provided, including: an interface 1, a temperature sensor 2 and a thermocouple terminal 4.

[0037] The interface 1 is provided on the temperature measuring instrument. The copper wire and the temperature sensor 2 are both connected to the handheld temperature measuring instrument through the interface 1.

[0038] In a specific example, the interface 1 is provided on the top of the handheld temperature measuring instrument. The interface 1 is a 4-core aviation interface. The temperature sensor 2 is a two-wire Pt100 platinum resistance thermometer. Two interfaces of the 4-core aviation interface are connected to the copper wire, and the other two interfaces of the 4-core aviation interface are connected to the two-wire Pt100 platinum resistance thermometer.

[0039] The thermocouple terminal 4 is used to connect thermocouples of different graduation numbers and serves as a thermocouple reference end.

[0040] The temperature sensor 2 is used to measure the temperature of the reference end of the thermocouple.

[0041] This application adopts 4-wire interface wiring, and the reference end of the thermocouple can be set at any position by adjusting the length of the copper wire as needed.

[0042] In another exemplary embodiment, the temperature measuring instrument wiring structure further includes an external sleeve 3. The thermocouple terminal 4 and the temperature sensor 2 are both arranged inside the external sleeve 3. The thermocouple terminal 4 is connected to thermocouples of various graduation numbers, and the measuring end 5 of the thermocouple extends to the outside of the external sleeve 3 to measure the temperature of the medium to be measured.

[0043] The present application provides a one-channel 4-core aviation interface, with the thermocouple terminal 4 as the reference end. The interface supports input of thermocouple signals of various graduation numbers, and supports two-wire Pt100 platinum resistance temperature sensors to accurately measure the temperature of the thermocouple reference end. There is no need to use various types of thermocouple compensation wires. The thermocouple reference end can be set at any position by adjusting the length of the copper wire as needed, reducing the length of the precious metal thermocouple. The temperature error of the thermocouple reference end can be less than ±0.02°C, which saves costs and greatly improves the accuracy of temperature measurement.

[0044] In another exemplary embodiment, a handheld temperature measuring instrument wiring method is also provided, comprising:

[0045] Step 11: Open interface 1 on the handheld temperature measuring instrument.

[0046] Step 12: Connect an external copper wire and a temperature sensor 2 through the interface 1. The copper wire is connected to thermocouples of different graduations through a thermocouple terminal 4. The thermocouple terminal 4 serves as a thermocouple reference end.

[0047] Step 13: Measure the temperature of the reference end of the thermocouple through the temperature sensor 2, and transmit the temperature of the reference end of the thermocouple to the temperature measuring instrument through the interface 1.

[0048] The interface 1, the thermocouple terminal 4 and the temperature sensor 2 in this embodiment are the same as the interface 1, the thermocouple terminal 4 and the temperature sensor 2 in the embodiment of the temperature measuring instrument wiring structure, and are not described in detail here.

[0049] In another exemplary embodiment, a handheld temperature measuring instrument is provided, including: a housing and a display area 6 .

[0050] An interface 1 is provided on the top of the housing to connect with a temperature sensor 2 through the interface 1 and to connect with a thermocouple terminal 4 through a copper wire.

[0051] The display area 6 is embedded in the housing and is used to display the temperature of the reference end of the thermocouple and the measured temperature.

[0052] Furthermore, the handheld temperature measuring instrument further comprises a key area 7; the key area 7 is embedded in the housing and is located below the display area 6. The key area 7 is used to adjust the working state of the handheld temperature measuring instrument.

[0053] The interface 1, the thermocouple terminal 4 and the temperature sensor 2 in this embodiment are the same as the interface 1, the thermocouple terminal 4 and the temperature sensor 2 in the embodiment of the temperature measuring instrument wiring structure, and are not described in detail here.

[0054] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A handheld temperature measuring instrument wiring structure, characterized in that: The handheld temperature measuring instrument wiring structure includes: an interface, a copper wire, a temperature sensor and a thermocouple terminal; The interface is provided on the temperature measuring instrument; the copper wire and the temperature sensor are connected to the handheld temperature measuring instrument through the interface; The copper wire is connected to thermocouples of different graduations through the thermocouple terminal; the thermocouple terminal serves as a thermocouple reference end; The temperature sensor is used to measure the temperature of the reference end of the thermocouple.

2. The handheld temperature measuring instrument wiring structure according to claim 1 is characterized in that: The interface is a 4-core aviation interface.

3. The handheld temperature measuring instrument wiring structure according to claim 2 is characterized in that: The temperature sensor is a two-wire Pt100 platinum resistance thermometer.

4. The handheld temperature measuring instrument wiring structure according to claim 3 is characterized in that: Two interfaces of the 4-core aviation interface are connected to the copper wire, and the other two interfaces of the 4-core aviation interface are connected to the two-wire Pt100 platinum resistance thermometer.

5. The handheld temperature measuring instrument wiring structure according to claim 1 is characterized in that: The wiring structure of the handheld temperature measuring instrument also includes an external sleeve; the thermocouple terminal and the temperature sensor are both arranged inside the external sleeve; the thermocouple terminal is connected to thermocouples of various graduations, and the measuring end of the thermocouple extends to the outside of the external sleeve to measure the temperature of the medium to be measured.

6. The handheld temperature measuring instrument wiring structure according to claim 1, characterized in that: The interface is opened on the top of the handheld temperature measuring instrument.

7. A handheld temperature measuring instrument wiring method, applied to the handheld temperature measuring instrument wiring structure according to any one of claims 1 to 6, characterized in that: The handheld temperature measuring instrument wiring method includes: Open an interface on the handheld temperature measuring instrument; The interface is connected with an external copper wire and a temperature sensor; the copper wire is connected with thermocouples of different graduations through a thermocouple terminal; the thermocouple terminal serves as a thermocouple reference end; The temperature of the reference end of the thermocouple is measured by a temperature sensor, and the temperature of the reference end of the thermocouple is transmitted to the temperature measuring instrument through the interface.

8. The handheld temperature measuring instrument wiring method according to claim 7, characterized in that: The interface is a 4-core aviation interface.

9. A handheld temperature measuring instrument, using the handheld temperature measuring instrument wiring structure according to any one of claims 1 to 6, characterized in that: The handheld temperature measuring instrument comprises: a housing and a display area; An interface is provided on the top of the housing to connect with the temperature sensor through the interface and to connect with the thermocouple terminal through a copper wire; The display area is embedded in the housing; the display area is used to display the temperature of the reference end of the thermocouple and the measured temperature.

10. The handheld temperature measuring instrument according to claim 9, characterized in that: The handheld temperature measuring instrument also includes a key area; the key area is embedded in the shell and is located below the display area; the key area is used to adjust the working state of the handheld temperature measuring instrument.

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