A temperature calibration device for an automatic refractometer

Abstract

The utility model discloses an automatic light folding appearance temperature calibration device, including two standard platinum resistance temperature measurement probe, with the same material variable diameter platform of platinum resistance thermometer protection sleeve and temperature display, two standard platinum resistance temperature measurement probe passes through transmission line and is connected temperature display, and the variable diameter platform is set with the jack of using cooperation with two standard platinum resistance temperature measurement probe, and the variable diameter platform has and the outer periphery of the measurement room inner periphery surface of automatic light folding appearance match. This automatic light folding appearance temperature calibration device can carry out more accurate temperature calibration, and the precision is higher.

Description

Technical Field

[0001] This utility model belongs to the technical field of temperature calibration devices, specifically relating to an automatic refractometer temperature calibration device. Background Technology

[0002] An automatic refractometer is an instrument used to measure the refractive index of liquids, widely used in food, pharmaceuticals, chemicals, petroleum, cosmetics, and academic research. It utilizes the principle of refraction to measure the critical angle of refraction, automatically displaying the measured value through high-speed, high-precision signal acquisition and analysis processing technology using a photosensitive component. It can quickly measure the refractive index of various liquids, including transparent, translucent, dark-colored, and viscous liquids. Temperature is a crucial factor affecting refractive index. Traditional handheld refractometers lacked temperature measurement and control systems, therefore national verification regulations did not require temperature traceability. With technological advancements, most modern automatic refractometers now have temperature measurement and control systems, necessitating temperature traceability for the equipment. JJF (Zhejiang) 1207-2024, the calibration specification for digital refractometers and content meters, stipulates that the temperature traceability method for instruments with temperature control functions involves setting the instrument's measuring chamber temperature, adding the required volume of pure water to the measuring chamber, immersing the digital thermometer probe below the liquid surface, waiting for temperature equilibrium, reading the digital thermometer measurement and the instrument's temperature reading, and repeating the measurement to calculate the temperature reading error. The maximum permissible error of the digital thermometer used in this method is ±0.1℃. Currently, the temperature control accuracy of some models of automatic refractometers from Anton Paar and Mettel TOLEDO is ±0.1℃. Therefore, this method is not very suitable for temperature traceability in refractive index measurement. Summary of the Invention

[0003] To address the shortcomings of existing automatic refractometer temperature calibration, this invention provides an automatic refractometer temperature calibration device.

[0004] The automatic refractometer temperature calibration device of this invention includes a second-order standard platinum resistance thermometer probe, a variable-diameter platform made of the same material as the protective sleeve of the platinum resistance thermometer, and a temperature display. The second-order standard platinum resistance thermometer probe is connected to the temperature display via a transmission line. The variable-diameter platform has a socket for use with the second-order standard platinum resistance thermometer probe, and the variable-diameter platform has an outer circumferential surface that matches the inner circumferential surface of the measuring chamber of the automatic refractometer. The material of the variable-diameter platform can be selected from quartz, platinum, or a special alloy. The variable-diameter platform also serves to support and fix the second-order standard platinum resistance thermometer probe. The socket can be a blind hole or a through hole, preferably a through hole. If a through hole is used, the lower end of the second-order standard platinum resistance thermometer probe should not exceed the bottom surface of the variable-diameter platform. During measurement, a small amount of pure water is added to the measuring chamber as a medium. The temperature response value of the through hole is faster.

[0005] Furthermore, the reducing platform is a truncated cone with the insertion hole located on the axis. This makes it easier to place into the measuring chamber.

[0006] Furthermore, the diameter of the bottom surface of the variable-diameter stage is slightly larger than the diameter of the sapphire measuring surface inside the measuring chamber of the automatic refractometer. This prevents the platinum resistance thermometer from contacting the sapphire measuring surface and damaging it.

[0007] Furthermore, an insulation cover is connected to the upper end of the second-class standard platinum resistance temperature probe. The diameter of the bottom surface of the insulation cover is larger than the diameter of the measuring chamber of the automatic refractometer. This effectively isolates the measuring chamber from air and provides insulation.

[0008] Beneficial effects: This invention uses a second-class standard platinum resistance temperature probe, resulting in higher temperature accuracy; the variable diameter platform can be set to different sizes to meet the needs of different manufacturers' automatic refractometers; this invention is suitable for measuring liquids with small volumes; by designing the variable diameter platform as an inverted frustum with the insertion hole on the axis, it can be more easily placed into the measuring chamber; by making the bottom diameter of the variable diameter platform larger than the diameter of the sapphire measuring surface inside the automatic refractometer's measuring chamber, it can prevent the platinum resistance from contacting the sapphire measuring surface and damaging it; by setting a heat-insulating cover at the top of the second-class standard platinum resistance temperature probe, with the bottom diameter of the heat-insulating cover larger than the diameter of the automatic refractometer's measuring chamber, it can isolate the measuring chamber from air and keep it warm. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the automatic refractometer temperature calibration device of this utility model; Figure 2 This is a schematic diagram of an existing automatic refractometer temperature calibration device in use. In the diagram, 1. Second-class standard platinum resistance temperature probe; 2. Variable diameter stage; 21. Socket; 3. Temperature display; 4. Transmission line; 5. Insulation cover. Detailed Implementation

[0010] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0011] like Figure 1As shown, this utility model is an automatic refractometer temperature calibration device, including a second-class standard platinum resistance temperature probe 1, a platinum variable diameter platform 2, and a temperature display 3. The second-class standard platinum resistance temperature probe 1 is connected to the temperature display 3 via a transmission line 4. The variable diameter platform 2 has a through hole 21 for use with the second-class standard platinum resistance temperature probe 1, and the lower end of the second-class standard platinum resistance temperature probe 1 does not exceed the bottom surface of the variable diameter platform 2. The variable diameter platform 2 has an outer peripheral surface that matches the inner peripheral surface of the measuring chamber of the automatic refractometer, which facilitates the placement of the variable diameter platform 2 into the measuring chamber.

[0012] Specifically, the variable diameter stage 2 is an inverted frustum, and the insertion hole 21 is located on the axis. The bottom diameter of the variable diameter stage 2 is slightly larger than the diameter of the sapphire measuring surface inside the measuring chamber of the automatic refractometer, thereby preventing the platinum resistance thermometer from contacting the sapphire measuring surface and damaging it. An insulating cover 5 is integrally formed on the upper end of the second-class standard platinum resistance thermometer probe 1. The bottom diameter of the insulating cover 5 is larger than the diameter of the measuring chamber of the automatic refractometer, serving to isolate the measuring chamber from air and maintain its temperature.

[0013] In practical use, set the required temperature on the automatic refractometer, select a suitable size of second-class standard platinum resistance temperature probe 1 and variable diameter stage 2 according to the size of the measuring chamber, add a small amount of pure water as a medium in the measuring chamber, place the variable diameter stage 2 in the measuring chamber, and ensure that the variable diameter stage 2 fits snugly against the sides of the measuring chamber. Then insert the second-class standard platinum resistance temperature probe 1 into the socket 21, keep the temperature constant for a period of time until the temperature stabilizes, and read the temperature reading from the temperature display 3. Calculate the temperature reading error of the automatic refractometer from this.

[0014] Existing automatic refractometer temperature calibration devices, such as Figure 2 As shown, the temperature probe without a variable diameter support is unstable and the measurement results are not very accurate.

[0015] Unless otherwise specified, all technologies mentioned above refer to existing technologies.

[0016] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification.

Claims

1. An automatic refractometer temperature calibration device, characterized in that, It includes a second-class standard platinum resistance temperature probe, a variable diameter platform made of the same material as the protective sleeve of the platinum resistance thermometer, and a temperature display. The second-class standard platinum resistance temperature probe is connected to the temperature display via a transmission line. The variable diameter platform has a socket for use with the second-class standard platinum resistance temperature probe. The variable diameter platform has an outer circumferential surface that matches the inner circumferential surface of the measuring chamber of the automatic refractometer.

2. The automatic refractometer temperature calibration device according to claim 1, characterized in that, The reducing platform is an inverted frustum, and the insertion hole is located on the axis.

3. The automatic refractometer temperature calibration device according to claim 2, characterized in that, The diameter of the bottom surface of the variable diameter stage is larger than the diameter of the sapphire measuring surface inside the measuring chamber of the automatic refractometer.

4. The automatic refractometer temperature calibration device according to claim 3, characterized in that, A heat-insulating cover is connected to the upper end of the second-class standard platinum resistance temperature probe. The diameter of the bottom surface of the heat-insulating cover is larger than the diameter of the measuring chamber of the automatic refractometer.

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