KR20100032087A - Automatic calibration system and method for thermometers at low temperatures - Google Patents

Abstract

PURPOSE: A system and a method for automatically correcting low-temperature of a thermometer are provided to automatically control the temperature of a low temperature maintain unit, and to complete correction until the temperature is naturally risen. CONSTITUTION: A system for automatically correcting low-temperature of a thermometer comprises a low temperature maintaining unit(100), a temperature control unit(200), a temperature measuring unit(300), and a controller(400). The low temperature maintaining unit has a reference thermometer(111) and a target thermometer(112), and maintains a low-temperature state. The temperature control unit controls the temperature of the low temperature maintaining unit. The temperature measuring unit measures the temperature of the reference thermometer and the target thermometer. The controller controls the temperature control unit, and reports the measured temperature.

Description

 Low Temperature Automatic Comparison Calibration System and Method of Thermometer {AUTOMATIC CALIBRATION SYSTEM AND METHOD FOR THERMOMETERS AT LOW TEMPERATURES}

The present invention relates to a low-temperature automatic comparative calibration system and method of a thermometer, and more particularly, to a low-temperature holding means having a reference thermometer and a calibration target thermometer in a low-temperature holding means for which a low-temperature is maintained by a low-temperature liquid to calibrate the thermometer. The present invention relates to a technique for calibrating a thermometer by automatically controlling temperature.

In general, there are two methods of calibrating thermometers commonly used in science and industry such as resistance thermometers, thermocouples and thermistors. Fixed point calibration is mainly applied for standard platinum resistance thermometers with the highest accuracy of 1 mK to several mK. On the other hand, for industrial thermometers requiring precision of tens of mK or lower, a comparative calibration method is used by comparing the reference device in the same temperature environment as the reference point based on the thermometer calibrated by the fixed point calibration method.

Therefore, for the comparative calibration of thermometers, it is essential to create an isothermal environment with excellent stability and homogeneity. For the configuration of such an isothermal environment, at a temperature of 600 ° C. or lower, a liquid thermostat using various constant solutions such as alcohol, water, silicone oil, and saltpeter is used depending on the temperature range, and an electric furnace is used at 600 ° C. or higher. In the case of a low temperature liquid thermostat, the lower limit temperature is about -50 degreeC--80 degreeC according to a model and a used thermostat.

Recently, the importance of precise temperature measurement in the lower temperature range is increasing due to the transport and storage of liquefied natural gas, the measurement of temperature at high altitudes related to meteorological observations and aviation, and the study of biotechnology applications. In order to compare and calibrate the thermometer in this temperature range (-200 ℃ ~ -80 ℃), a low temperature constant temperature device can be used to control the temperature to the desired temperature using a heating wire after lowering the system temperature using liquid nitrogen. It must be designed and manufactured.

At present, there is no commercial product with this function. However, there is only a system in the form of a product that can compare and calibrate the thermometer only at the boiling point of liquid nitrogen temperature (-195.8 ° C) without a separate heating device.

In such a low temperature comparative calibration device, the height of the equipment to be manufactured is limited by the length of the thermometer to be calibrated. In the case of industrial thermometers that are commonly used, the length of the stem of the thermometer is about 450 mm. The sensor part is placed near the liquid nitrogen temperature and the thermometer knob is placed at room temperature. do.

Therefore, when filling a liquid nitrogen into a calibration device equipped with such a thermometer, the level of liquid nitrogen does not exceed 400 mmm and must be replenished continuously due to the natural evaporation of liquid nitrogen. Therefore, in order to automate the long-term comparative calibration process, it is necessary to make a system for measuring liquid level frequently and automatically replenishing liquid nitrogen when the level is lower than a certain level. However, such manufacturing is expensive and difficult to use continuously.

The present invention has been made to solve the above-mentioned problems, and to provide a low-temperature automatic comparative calibration system and method of the thermometer that can automatically compare the thermometer in a low temperature state without configuring the automatic low temperature liquid replenishment equipment do.

It is also an object of the present invention to provide a low-temperature automatic comparative calibration system and method for filling a low-temperature holding means and then performing a comparative calibration of the necessary thermometer until the temperature rises naturally without refilling the low-temperature liquid.

Low temperature automatic comparison calibration system of the thermometer of the present invention for achieving the above object is provided with a reference thermometer 111 and the target thermometer 112, the low temperature holding means for maintaining a low temperature state by the low temperature liquid; Temperature control means (200) for controlling the temperature of the cryostat (100); Temperature measuring means (300) for measuring the temperature of the reference thermometer (111) and the calibration target thermometer (112); And control means 400 for controlling the temperature adjusting means 200 and for recording the temperature measured by the temperature measuring means 300.

Preferably, the reference thermometer 111 and the calibration target thermometer 112 and the temperature measuring means 300, and alternately by the switch box driver 550 connected to the control means 400 automatically It further comprises a multi-channel switch box 500 for controlling the connection.

Here, the cryostat means 100 is provided with the reference thermometer 111 and the calibration target thermometer 112, the copper block (Copper) to transfer heat to the reference thermometer 111 and the calibration target thermometer (112). Block 110 and a shield can (120) to prevent heat transfer to the copper block (110).

In addition, the temperature control means 200 is composed of a first temperature controller 210 for adjusting the temperature of the copper block 110 and a second temperature controller 220 for controlling the temperature of the shield can 120. To have.

In addition, the control means 400 is characterized in that for controlling the temperature adjusting means 200 according to the user's input information.

In this case, the user's input information includes the reference thermometer 111 information, the temperature change information of the low temperature maintaining means 100, the calibration temperature of the calibration target thermometer 112, the calibration point information, and the low temperature maintenance means. It characterized by including the temperature and the temperature stability of (100).

On the other hand, the low temperature automatic comparison calibration method of the low temperature automatic comparison calibration system of the thermometer to the reference thermometer 111 and the target thermometer 112 to the copper block 110 in the low temperature holding means 100 is maintained at a low temperature by the low temperature liquid. Calibration preparation step provided (S100); A temperature adjusting step (S200) of raising the temperature of the copper block 110 to the calibration temperature of the calibration target thermometer 112; A temperature measuring step (S300) of measuring the temperature of the reference thermometer 111 and the calibration target thermometer 112 when the temperature of the copper block 110 reaches the calibration temperature; And a calibration information storing step (S400) of storing measured temperature values of each of the reference thermometer 111 and the calibration target thermometer 112.

Here, the calibration preparation step (S100), the reference thermometer 111 information, the temperature change information of the low temperature holding means 100, the calibration temperature of the calibration target thermometer 112, calibration point information and calibration conditions An environment file input step (S110) of receiving an environment file of a user including a temperature and a temperature stability of the cryostat 100; And it characterized in that it comprises a step (S120) having a thermometer for placing the reference thermometer 111 and the calibration target thermometer 112 in the copper block (110).

In addition, the temperature control step (S200), a temperature setting step (S210) of setting the calibration temperature in the temperature control means 200 for controlling the temperature of the copper block 110; And a temperature raising step (S220) of allowing the temperature adjusting means 200 to raise the temperature of the copper block 110 to the calibration temperature.

In addition, the thermometer temperature measuring step (S300), a temperature arrival reading step (S310) for reading whether the temperature of the copper block 110 has reached the calibration temperature; A temperature maintenance reading step (S320) of reading whether the temperature of the copper block 110 is maintained at the calibration temperature after the temperature of the copper block 110 reaches the calibration temperature; And a temperature value measuring step (S330) of measuring temperature values of the reference thermometer 111 and the calibration target thermometer 112 when the temperature of the copper block 110 is maintained at the calibration temperature. Have

In addition, when the temperature of the copper block 110 is read that the calibration temperature has not reached the calibration temperature in the temperature arrival reading step (S310), the temperature adjusting step of raising the temperature of the copper block 110 to the calibration temperature. It is characterized by performing (S200).

In addition, when the temperature of the copper block 110 is read as not being maintained at the calibration temperature in the temperature maintenance reading step (S320), the temperature adjusting step of raising the temperature of the copper block 110 to the calibration temperature ( S200) is characterized in that to perform.

In addition, the calibration information storage step (S400), the temperature value storage step (S410) for storing the temperature value of the reference thermometer 111 and the calibration target thermometer 112 measured at the calibration temperature; And a calibration point determination step (S420) of determining whether or not a calibration point exists in the calibration target thermometer 112.

In addition, if it is determined that there are more calibration points in the calibration point determination step (S420), it is characterized in that the return to the temperature control step (S200).

Low temperature automatic comparison calibration system and method of the thermometer of the present invention has an automated effect of automatically processing the calibration of the thermometer from the low temperature state to room temperature without refilling the low temperature liquid during the calibration operation.

In addition, it is possible to save time and effort in calibrating the thermometer, it is possible to precisely control the temperature change of the cryostat holding means is provided with a resistance thermometer has the effect of correcting the correct thermometer.

Hereinafter, a low temperature automatic comparison calibration system and method of the thermometer of the present invention will be described in detail with reference to the accompanying drawings. The drawings introduced below are provided by way of example so that the spirit of the invention to those skilled in the art can fully convey. Therefore, the present invention is not limited to the drawings presented below and may be embodied in other forms. Also, like reference numerals denote like elements throughout the specification.

Hereinafter, the technical and scientific terms used herein will be understood by those skilled in the art without departing from the scope of the present invention. Descriptions of known functions and configurations that may be unnecessarily blurred are omitted.

1 is a block diagram of a low-temperature automatic comparison calibration system of the thermometer of the present invention, Figure 2 is a conceptual diagram showing the thermometer calibration principle of the present invention, Figure 3 is a table showing the input of the segment according to the thermometer calibration principle of FIG. 4 is a flowchart illustrating a low temperature automatic comparison calibration method of a thermometer of the present invention, FIG. 5 is a flowchart illustrating a calibration preparation step according to the present invention, and FIG. 6 is a flowchart illustrating a temperature adjustment step according to the present invention. 7 is a flowchart illustrating a temperature measuring step according to the present invention, and FIG. 8 is a flowchart illustrating a thermometer calibration step according to the present invention.

First, the configuration of the low temperature automatic comparison calibration system of the thermometer of the present invention will be described with reference to FIG. 1.

As shown in Figure 1, the low temperature automatic comparison calibration system of the thermometer is provided with a reference thermometer 111 and the calibration target thermometer 112, the cryostat means for maintaining a low temperature state by the low-temperature liquid; Temperature control means (200) for controlling the temperature of the cryostat (100); Temperature measuring means (300) for measuring the temperature of the reference thermometer (111) and the calibration target thermometer (112); And a control means 400 for controlling the temperature adjusting means 200 and for recording the temperature measured by the temperature measuring means 300.

Preferably, the reference thermometer 111 and the calibration target thermometer 112 and the temperature measuring means 300, and alternately by the switch box driver 550 connected to the control means 400 automatically It further comprises a multi-channel switch box 500 for controlling the connection.

At this time, the low temperature liquid supplied to the low temperature holding means 100 is preferably liquid nitrogen or liquid helium.

Next, the cryostat 100 includes a copper block 110 and a shield can 120.

Here, the copper block 110 is provided inside the shield can 120 to prevent heat transfer into the copper block 110 by the shield can 120.

In this case, the shield can 120 is preferably made of copper.

Next, the reference thermometer 111 and the calibration target thermometer 112 are provided in the copper block 110.

In this case, it is preferable that the plurality of calibration target thermometers 112 be provided.

Next, the temperature control means 200 is composed of a first temperature controller 210 and a second temperature controller 220.

At this time, the temperature control means 200 is connected to the control means 400 is controlled by the control means 400 temperature control.

Next, the first temperature controller 210 is connected to the copper block 110 to adjust the temperature of the copper block 110 by the control of the control means 400.

Next, the second temperature controller 220 is connected to the shield can 120 to adjust the temperature of the shield can 120 under the control of the control means 400.

In this case, the shield can 120 is preferably controlled to a temperature lower than the temperature of the copper block 110. Controlling the temperature of the shield can 120 to a temperature lower than the temperature of the copper block 110 is to control the temperature of the copper block 110 to a desired temperature through heating using a heating wire mounted on the copper block 110. This is for precise adjustment.

Next, the temperature measuring means 300 is preferably provided with measuring means for reading the temperature of the reference thermometer 111 and the calibration target thermometer 112.

Next, the temperature measuring means 300 is connected to the cryostat 100 and the multi-channel switch box 500.

In this case, the multi-channel switch box 500 may be connected to the reference thermometer 111 and the calibration target thermometer 112, respectively.

Next, the control means 400 controls the temperature adjusting means 200 according to the user's input information, and receives the measured temperature value from the temperature measuring means 300.

In this case, the user's input information includes the reference thermometer 111 information, the temperature change information of the low temperature maintaining means 100, the calibration temperature of the calibration target thermometer 112, the calibration point information, and the low temperature maintenance means. It is preferable to include the temperature and temperature stability of (100).

On the other hand, the control means 400 is preferably a control computer 410, the control computer 410 is the reference thermometer 111 and the calibration target thermometer 112 input from the temperature measuring means 300. Analyze the results of comparing the measured temperature values.

Next, with reference to the graph of Figure 2 with respect to the thermometer calibration principle of the automatic low temperature automatic comparison calibration system of the thermometer of the above-described configuration as follows.

As shown in FIG. 2, when the calibration temperature range of the thermometer to be calibrated is T2 ° C to 0 ° C, a calibration point of the thermometer is set at T2 ° C to 0 ° C.

At this time, the T2 ℃ refers to the temperature below zero and does not leave the temperature range of the low temperature liquid supplied to the low temperature holding means (100).

Here, the calibration point means a calibration temperature number that you want to calibrate the thermometer. If the user wants to calibrate at 40 ℃ interval from -200 ℃ to 0 ℃, the calibration point is 5.

Next, the calibration temperatures shown in Figure 2 are T2 ° C, T1 ° C and 0 ° C and the calibration point is 3. 

Next, a rise time S1 is set when the temperature of the resistance thermometer to be calibrated is increased from T2 ° C to T1 ° C.

Next, after the temperature is raised to T1 ° C, a holding time S2 for maintaining the temperature at T1 ° C is set.

Next, the rise time S3 at the time of raising the temperature from the said T1 degreeC to 0 degreeC is set.

Next, after the temperature is raised to 0 ° C., a holding time S4 of maintaining the temperature at 0 ° C. is set.

In this case, the temperature to be raised, the rise time at that time, the temperature to be maintained and the holding time at that time are called segments, respectively, and the respective segments are referred to as steps.

Next, the temperature rising section from T2 ° C to T1 ° C is called the first segment, and the section maintaining the temperature at T1 ° C is called the second segment.

Next, the temperature rising section from T1 ° C. to 0 ° C. is called a third segment, and the section maintaining the temperature at 0 ° C. is called a fourth segment.

Next, in the case of Figure 2 there are a total of four segments, each segment consists of time and temperature, even if the temperature is the same segment temperature must be entered.

Next, the input for each segment is as shown in FIG.

As shown in FIG. 3, the temperature rise time S1 and the temperature T1 of the first segment Seg1 are input and the temperature holding time S2 and the temperature T1 of the second segment Seg2 are input. Enter).

In addition, the third segment (seg 3) inputs a temperature rise time (S3) and a temperature (0) similarly to the first segment (seg 1), and the fourth segment (seg 4) is the second segment (seg). As in 2), the temperature holding time S4 and the temperature 0 are input.

Meanwhile, the first segment (seg 1) and the second segment (seg 2) are divided into a first step (step 1), and the third segment (seg 3) and the fourth segment (seg 4) are the second step. (step 2).

At this time, even if the number of segments increases, it is preferable to divide into a plurality of steps each including a temperature rising segment and a temperature holding segment in the same manner as described above.

Next, the thermometer temperature calibration of the first step and the second step is a second segment, which is a temperature holding segment of each of the first and second steps. 2) and the fourth segment (seg 4).

Next, after maintaining the temperature in the second segment (seg 2) and the fourth segment (seg 4) for a predetermined time, it is determined whether the temperature is stable, and a calibration point is displayed.

On the other hand, in the above-described calibration principle, after the low temperature liquid is supplied into the low temperature holding means 100, the low temperature liquid is preferably completed within a time when the low temperature naturally rises from room temperature to room temperature.

Next, a low temperature automatic comparison calibration method of the thermometer of the present invention having the above-described configuration and calibration principle will be described with reference to FIG. 4.

As shown in FIG. 4, the automatic low temperature automatic calibration method of the thermometer uses the reference thermometer 111 and the calibration target thermometer 112 on the copper block 110 in the low temperature maintaining means 100 in which the low temperature is maintained by the low temperature liquid. Calibration preparation step provided (S100); A temperature adjusting step (S200) of raising the temperature of the copper block 110 to the calibration temperature of the calibration target thermometer 112; A temperature measuring step (S300) of measuring the temperature of the reference thermometer 111 and the calibration target thermometer 112 when the temperature of the copper block 110 reaches the calibration temperature; And a calibration information storage step (S400) of storing measured temperature values of each of the reference thermometer 111 and the calibration target thermometer 112.

Next, the calibration preparation step S100 according to the present invention will be described with reference to FIG. 5.

As shown in Figure 5, the calibration preparation step (S100), the reference temperature meter 111 information, the temperature change information of the cryostat 100, the calibration temperature of the calibration target thermometer 112, calibration An environment file input step (S110) of receiving an environment file of a user including temperature and temperature stability of the low temperature maintaining means 100 which are point information and a calibration condition; And a step of providing a thermometer (S120) for placing the reference thermometer 111 and the calibration target thermometer 112 on the copper block 110.

First, the control computer 410 receives the environment file of the user.

Next, the user places the reference thermometer and the calibration target thermometer 112 in the copper block 110 of the cryostat 100.

Next, the temperature control step (S200) according to the present invention with reference to Figure 6 as follows.

As shown in Figure 6, the temperature control step (S200), the temperature setting step (S210) for setting the calibration temperature in the temperature control means 200 for controlling the temperature of the copper block 110; And a temperature raising step (S220) of allowing the temperature adjusting means 200 to raise the temperature of the copper block 110 to the calibration temperature.

First, the control computer adjusts the first temperature controller and the second temperature controller of the temperature adjusting means according to the environment file of the user input to the control computer.

At this time, the first temperature controller 210 is set to the calibration temperature according to the calibration point information of the calibration target thermometer 112.

Next, the first temperature controller 210 raises the temperature of the copper block 110 to the calibration temperature, and the second temperature controller 220 of the shield can 120 at a temperature lower than the calibration temperature. Raise the temperature.

Next, the thermometer temperature measuring step S300 according to the present invention will be described with reference to FIG. 7.

As shown in Figure 7, the thermometer temperature measuring step (S300), the temperature arrival reading step (S310) for reading whether the temperature of the copper block 110 has reached the calibration temperature; A temperature maintenance reading step (S320) of reading whether the temperature of the copper block 110 is maintained at the calibration temperature after the temperature of the copper block 110 reaches the calibration temperature; And a temperature value measuring step S330 of measuring temperature values of the reference thermometer 111 and the calibration target thermometer 112 when the temperature of the copper block 110 is maintained at the calibration temperature.

At this time, when the temperature of the copper block 110 is read that the calibration temperature has not reached the calibration temperature in the temperature reaching reading step (S310), the temperature adjusting step of raising the temperature of the copper block 110 to the calibration temperature ( S200).

In addition, when the temperature of the copper block 110 is read as not being maintained at the calibration temperature in the temperature maintenance reading step (S320), the temperature adjusting step of raising the temperature of the copper block 110 to the calibration temperature ( S200).

First, the control computer 400 measures the temperature of the reference thermometer 111 through the temperature measuring means 300 to determine whether the temperature of the copper block 110 has reached the calibration temperature. Enter at 410.

Next, the control computer 410 determines whether the temperature of the reference thermometer 111 has reached the calibration temperature based on the input result.

Next, after a predetermined time passes, the temperature of the reference thermometer 111 is measured to determine whether the temperature of the copper block 110 is maintained at the calibration temperature.

Next, when it is determined that the copper block 110 has reached the calibration temperature and is maintained at the calibration temperature, the temperature measuring means 300 is a temperature value of the reference thermometer 111 and the calibration target thermometer 112. Is measured through the multi-channel switch box 500.

In this case, the multi-channel switch box 500 may be controlled through the switch box driver 550 connected to the control computer 410.

Next, the calibration information storage step S400 according to the present invention will be described with reference to FIG. 8.

As shown in FIG. 8, the calibration information storing step S400 may include a temperature value storing step of storing temperature values of the reference thermometer 111 and the calibration target thermometer 112 measured at the calibration temperature. S410); And a calibration point determination step (S420) of determining whether a calibration point exists in the calibration target thermometer 112.

At this time, if it is determined that there are more calibration points in the calibration point determination step (S420), it is preferable to return to the temperature control step (S200) and perform a step after the temperature control step (S200).

First, the temperature measuring means 300 inputs the temperature value of the reference thermometer 111 and the temperature value of the calibration target thermometer 112 into the control computer 410.

Next, the control computer 410 stores the temperature value of the reference thermometer 111 received from the temperature measuring means 300 and the temperature value of the calibration target thermometer 112.

Next, the control computer 410 determines whether a calibration point of the calibration target thermometer 112 is further present according to the calibration point information of the user environment file.

Next, if the calibration point of the calibration target thermometer 112 is further present, the control computer is configured to adjust the first temperature controller and the first temperature controller of the temperature control means according to the calibration point information of the user's environment file input to the control computer. 2 Adjust the thermostat.

At this time, the first temperature controller 210 is set to the calibration temperature according to the calibration point information of the calibration target thermometer 112.

On the other hand, if there are no more calibration points of the calibration target thermometer 112, the control computer ends the calibration.

1 is a block diagram of a low temperature automatic comparison calibration system of the thermometer of the present invention,

2 is a conceptual diagram showing a thermometer calibration principle of the present invention,

3 is a table showing the input of the segment according to the thermometer calibration principle of FIG.

4 is a flow chart showing a low-temperature automatic comparison calibration method of the thermometer of the present invention,

5 is a flowchart showing a calibration preparation step according to the present invention;

6 is a flow chart showing a temperature control step according to the present invention,

7 is a flowchart illustrating a temperature measuring step according to the present invention;

8 is a flowchart illustrating a thermometer calibration step according to the present invention.

* Description of Major Symbols in Drawings *

100: low temperature holding means 110: copper block

111: reference thermometer 112: calibration target thermometer

120: shield can 200: temperature control means

210: first temperature controller 220: second temperature controller

300: temperature measuring means 400: control means

410: control computer 500: multi-channel switch box

550: switch box driver

Claims (14)

A low temperature holding means (100) provided with a reference thermometer (111) and a calibration target thermometer (112) to maintain a low temperature state by a low temperature liquid; Temperature control means (200) for controlling the temperature of the cryostat (100); Temperature measuring means (300) for measuring the temperature of the reference thermometer (111) and the calibration target thermometer (112); And Control means 400 for controlling the temperature adjusting means 200, and recording the temperature measured by the temperature measuring means 300 Low temperature automatic comparison calibration system of the thermometer comprising a. According to claim 1, The reference thermometer 111 and the calibration target thermometer 112 and the temperature measuring means 300, and the switch box driver 550 connected to the control means 400 automatically alternately to control the connection Low temperature automatic comparison calibration system of the thermometer, characterized in that it further comprises a multi-channel switch box (500). According to claim 1, The low temperature maintaining means 100 is provided with the reference thermometer 111 and the calibration target thermometer 112, and a copper block for transferring heat to the reference thermometer 111 and the calibration target thermometer 112 (Copper Block) Low temperature automatic comparison calibration system of the thermometer comprising a (110) and a shield can (120) to prevent heat transfer to the copper block (110). The method according to claim 1 or 3, Temperature control means 200 comprises a first temperature controller 210 for adjusting the temperature of the copper block 110 and a second temperature controller 220 for adjusting the temperature of the shield can 120, characterized in that Low temperature automatic comparison calibration system of thermometer. According to claim 1, The control means 400 is a low temperature automatic comparison calibration system of the thermometer, characterized in that for controlling the temperature control means 200 according to the user's input information. 6. The method of claim 5, The user input information includes the reference thermometer 111 information, the temperature change information of the low temperature maintaining means 100, the calibration temperature of the calibration target thermometer 112, the calibration point information, and the low temperature maintaining means 100. Low temperature automatic comparison calibration system of the thermometer, characterized in that it comprises a) and the temperature stability (). A calibration preparation step (S100) having a reference thermometer 111 and a calibration target thermometer 112 in a copper block 110 in the low temperature holding means 100 in which the low temperature is maintained by the low temperature liquid; A temperature adjusting step (S200) of raising the temperature of the copper block 110 to the calibration temperature of the calibration target thermometer 112; A temperature measuring step (S300) of measuring the temperature of the reference thermometer 111 and the calibration target thermometer 112 when the temperature of the copper block 110 reaches the calibration temperature; And Calibration information storage step of storing the measured temperature value of each of the reference thermometer 111 and the calibration target thermometer 112 (S400) Low temperature automatic comparison calibration method of the thermometer comprising a. The method of claim 7, wherein The calibration preparation step (S100), The reference thermometer 111 information, the temperature change information of the low temperature holding means 100, the calibration temperature of the calibration target thermometer 112, the calibration point information and the temperature and temperature of the low temperature holding means 100 to be a calibration condition. An environment file input step (S110) of receiving an environment file of a user including stability; And Equipped with a thermometer to position the reference thermometer 111 and the calibration target thermometer 112 in the copper block 110 (S120) Low temperature automatic comparison calibration method of the thermometer comprising a. The method of claim 7, wherein The temperature control step (S200), A temperature setting step (S210) of setting the calibration temperature to a temperature control means (200) for controlling the temperature of the copper block (110); And The temperature adjusting step 200 increases the temperature of the copper block 110 to the calibration temperature (step S220) Low temperature automatic comparison calibration method of the thermometer comprising a. The method of claim 7, wherein The thermometer temperature measuring step (S300), A temperature arrival reading step (S310) of reading whether the temperature of the copper block 110 has reached the calibration temperature; A temperature maintenance reading step (S320) of reading whether the temperature of the copper block 110 is maintained at the calibration temperature after the temperature of the copper block 110 reaches the calibration temperature; And When the temperature of the copper block 110 is maintained at the calibration temperature, the temperature value measuring step of measuring the temperature value of the reference thermometer 111 and the calibration target thermometer 112 (S330) Low temperature automatic comparison calibration method of the thermometer comprising a. The method of claim 10, When the temperature of the copper block 110 is read that the calibration temperature has not reached the calibration temperature in the temperature reaching reading step (S310), the temperature adjusting step (S200) of raising the temperature of the copper block 110 to the calibration temperature. Low temperature automatic comparison calibration method of the thermometer, characterized in that to carry out. The method of claim 10, If it is read that the temperature of the copper block 110 is not maintained at the calibration temperature in the temperature maintenance reading step (S320), the temperature adjusting step (S200) of raising the temperature of the copper block 110 to the calibration temperature. Low temperature automatic comparison calibration method of the thermometer, characterized in that to carry out. The method according to any one of claims 7, 8 or 10, The calibration information storage step (S400), A temperature value storing step (S410) of storing temperature values of the reference thermometer 111 and the calibration target thermometer 112 measured at the calibration temperature; And Calibration point determination step (S420) to determine whether the calibration point exists in the calibration target thermometer 112 Low temperature automatic comparison calibration method of the thermometer comprising a. The method of claim 13, If it is determined that there are more calibration points in the calibration point determination step (S420), the low-temperature automatic comparison calibration method of the thermometer, characterized in that the return to the temperature control step (S200).

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