JP2004317193A - Cryogenic calibration method and cryogenic calibrating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cryogenic calibration method and a cryogenic calibrating apparatus for calibrating an actual temperature as an entire cryogenic measuring apparatus including a temperature sensor to be calibrated, a signal cable, and a display at an installation location of the temperature sensor to be calibrated or near it. <P>SOLUTION: The cryogenic calibrating apparatus that can be moved to a location, where the temperature sensor to be calibrated connected to the display via the signal cable is installed, or near the location, and the temperature sensor to be calibrated connected to the display via the signal cable is inserted into the cryogenic calibrating apparatus along with a standard temperature sensor, thus calibrating the actual temperature of the temperature sensor to be calibrated. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a temperature calibration method and a temperature calibration device, and more particularly, to an ultra-low temperature calibration method and a calibration device using a portable device.
[0002]
[Prior art]
FIG. 3 is a general use example diagram of a temperature sensor for ultra-low temperature. For example, an ultra-low temperature sensor 1 made of a T-type thermocouple can set the internal temperature to −80 ° C. or less, and measures the internal temperature of the freezer 2 for storing cultured tissue, for example. It is attached to the attachment part 3. Then, the measurement signal of the ultra-low temperature sensor 1 is output to the paperless recorder 4, the chart recorder 5, the monitoring and recording device 6 using a personal computer, and the like according to the system configuration.
[0003]
In order to assure and prove that the measured values of such thermometers and temperature measuring devices maintain the prescribed accuracy, periodically calibrate and clarify the correspondence between each measured value and correction value. I have to put it.
[0004]
Therefore, in general, for example, as shown in FIG. 4, the temperature sensor 1 to be calibrated is inserted into a temperature-controlled comparative thermostat 8 together with a standard temperature sensor 7 made of a platinum resistance thermometer which has been calibrated in advance. The actual temperature in the comparison thermostat 8 is measured, and the measured value of the standard temperature sensor 7 digitally displayed on the digital thermometer 9 used as a display device is digitally displayed on the digital thermometer 10 used as a display device as a standard. Actual temperature calibration for comparing and calibrating the measured value of the calibration temperature sensor 1 is performed. Here, as the standard temperature sensor, a sensor whose “traceability” based on JIS 8103, which is calibrated one after another at a higher measurement level and a path leading to a national standard and an international standard is established, is guaranteed.
[0005]
By the way, as a user of the temperature sensor 1 to be calibrated, the calibration of the temperature sensor 1 to be calibrated is performed by setting the comparative thermostatic chamber 8 to a place where the temperature sensor 1 to be calibrated is installed in order to maintain the continuous operation of the temperature measurement target device such as a freezer. Or, it is desirable to carry it around.
[0006]
However, in the conventional portable comparative thermostatic bath, the temperature setting range cannot be set to −30 ° C. or lower because the temperature bath is an air bath type. Further, the air bath type temperature bath has a large thermal time constant, and it takes one hour or more to reach the set temperature, so that the working efficiency is poor.
[0007]
At present, a device commercialized as a comparative constant temperature device that can be set at -30 ° C or lower has a weight of 100 kg or more and a power supply of 200 V AC, and is used in a general site where the power supply is 100 V AC. Is not suitable.
[0008]
For these reasons, at present, actual temperature calibration in an ultra-low temperature range (−80 ° C. or less) cannot be performed at the installation location of the temperature sensor 1 to be calibrated.
[0009]
Therefore, as shown in the flowchart of FIG. 5, the user or a calibration technician such as a manufacturer of the temperature sensor to be calibrated removes the temperature sensor to be calibrated from the temperature measurement target device (SP1) and sets the substitute temperature sensor as the temperature measurement device. Attach (SP2). Then, after the removed temperature sensor to be calibrated is packed (SP3), it is sent to the calibration service company by freight (SP4). The calibration business unpacks the package (SP5), and performs the actual temperature calibration using only the temperature sensor to be calibrated (SP6).
[0010]
When the calibration of the actual temperature is completed, the calibration company packs the temperature sensor to be calibrated (SP7) and sends it to the user by freight (SP8). The user unpacks (SP9), removes the alternative temperature sensor from the temperature measurement target device (SP10), and attaches the temperature sensor to be calibrated to the temperature measurement target device (SP1.1). In the display device to which the temperature sensor to be calibrated is connected, on-site calibration is performed by inputting a simulated electric signal via a signal cable from a portion from which the temperature sensor to be calibrated is removed.
[0011]
[Patent Document 1]
JP 2000-205973A
[0012]
Patent Literature 1 discloses a method and an apparatus for calibrating a thermocouple for temperature measurement of a cryogenic liquid using a real liquid such as liquid oxygen or liquid nitrogen.
[0013]
However, Patent Literature 1 does not suggest calibrating using a portable comparative thermostat as in the present invention.
[0014]
[Problems to be solved by the invention]
With the conventional method of sending the temperature sensor to be calibrated to the factory of the calibration company every time the ultra-low temperature calibration of -30 ° C or less is performed for the temperature sensor to be calibrated, the cost of having an alternative temperature sensor, the temperature of the temperature sensor, Man-hours for removing and attaching to the device to be measured, man-hours for packing, shipping, and unpacking the temperature sensor, etc., increase the cost burden for the user and increase the user's installation of the calibrated temperature sensor to be calibrated. It is not uncommon for it to take almost a month to return to the scene.
[0015]
In the method of sending the temperature sensor to be calibrated to the factory of the calibration business, the actual temperature calibration of the entire ultra-low temperature measurement device including the temperature sensor to be calibrated, the signal cable, and the display device cannot be performed. Can not prove.
[0016]
The present invention focuses on these problems, and its object is to measure the actual temperature of the ultra-low temperature measurement device as a whole including the temperature sensor to be calibrated, the signal cable, and the display device at or near the installation location of the temperature sensor to be calibrated. An object of the present invention is to provide an ultra-low temperature calibration method and an ultra-low temperature calibration device capable of performing calibration.
[0017]
[Means for Solving the Problems]
The invention of claim 1 which achieves the above object is as follows.
A cryogenic calibration device movably configured is transported to or near the place where the temperature sensor to be calibrated connected to the display device via the signal cable is installed, and the device connected to the display device via the signal cable. An ultra-low temperature calibration method characterized by performing actual temperature calibration of a temperature sensor to be calibrated by inserting a calibration temperature sensor into an ultra-low temperature calibration device together with a standard temperature sensor.
[0018]
The invention according to claim 2 is the ultra-low temperature calibration method according to claim 1,
As an ultra-low temperature calibration device,
A tubular liquid tank into which a cooling liquid is injected by cooling in a refrigerator and a temperature sensor to be calibrated and a standard temperature sensor are inserted to the same depth according to a guide,
A temperature controller for controlling the refrigerator so that the inside of the tubular liquid tank has a desired ultra-low temperature;
And a moving wheel mounted on the bottom of the apparatus.
[0019]
According to a third aspect of the present invention, in the ultra-low temperature calibration method according to the first or second aspect,
Ultra low temperature calibration equipment
At least two tubular liquid tanks;
It is characterized by having a temperature controller for individually controlling the temperatures of these tubular liquid tanks.
[0020]
According to a fourth aspect of the present invention, in the ultra-low temperature calibration method according to the second or third aspect,
An outlet for cooling liquid is provided at the bottom of the tubular liquid tank.
[0021]
According to a fifth aspect of the present invention, in the ultra-low temperature calibration method according to any one of the second to fourth aspects,
A detachable lid is provided at the opening of the tubular liquid tank, and a guide for positioning the insertion depth of the temperature sensor to be calibrated and the standard temperature sensor is integrated with the lid.
[0022]
The invention of claim 6 is
A tubular liquid tank into which a cooling liquid is injected by cooling in a refrigerator and a temperature sensor to be calibrated and a standard temperature sensor are inserted to the same depth according to a guide,
A temperature controller for controlling the refrigerator so that the inside of the tubular liquid tank has a desired ultra-low temperature;
And a moving wheel mounted on the bottom surface of the apparatus.
[0023]
The invention according to claim 7 is the ultra-low temperature calibration device according to claim 6,
At least two tubular liquid tanks;
It is characterized in that a temperature controller for individually controlling the temperatures of these tubular liquid tanks is provided.
[0024]
The invention according to claim 8 is the ultra-low temperature calibration device according to claim 6 or 7,
An outlet for cooling liquid is provided at the bottom of the tubular liquid tank.
[0025]
According to a ninth aspect of the present invention, in the ultralow temperature calibration apparatus according to any one of the sixth to eighth aspects,
A removable lid is provided at the opening of the tubular liquid tank,
The lid is integrated with a guide for positioning the insertion depth of the temperature sensor to be calibrated and the standard temperature sensor.
[0026]
Thus, an ultra-low temperature calibration method and an ultra-low temperature calibration device capable of performing actual temperature calibration of the entire ultra-low temperature measurement device including the temperature sensor to be calibrated, the signal cable, and the display device at or near the installation location of the temperature sensor to be calibrated can be realized. it can.
[0027]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail based on embodiments of the present invention with reference to the drawings. FIG. 1 is a conceptual diagram showing the configuration of an embodiment of the present invention, and the same reference numerals are given to the parts common to FIG. 3 and FIG. In FIG. 1, an ultra-low temperature calibration apparatus 100 is configured to be movable as shown in FIG. 2, and is transported to a place where the temperature sensor 1 to be calibrated is installed or in the vicinity thereof to perform ultra-low temperature calibration.
[0028]
In FIG. 2, two systems of individually controllable refrigerators 1 and 10 are provided inside the ultra-low temperature calibration apparatus 100, and the pipe-shaped liquid tanks 121 and 122 are individually set to, for example, a temperature lower limit of about −150 ° C. Cooling. The tubular liquid tanks 121 and 122 are provided so as to open at the upper part of the ultra-low temperature calibration apparatus 100, and a commercially available alcohol-based cooling liquid is injected into the inside thereof, and the opening is detachable. Covers 131 and 132 are attached. The opening diameter of the tubular liquid tanks 121 and 122 is, for example, 30 mm, and the depth is 340 mm.
[0029]
Guides 141 and 142 for inserting the temperature sensor 1 to be calibrated and the standard temperature sensor 7 to the same depth in the tubular liquid tanks 121 and 122 are integrated with the lids 131 and 132, respectively. At the bottom of the tubular liquid tanks 121 and 122, outlets 151 and 152 for recovering the cooling liquid are provided.
[0030]
The temperature controllers 161 and 162 which perform temperature display and ON / OFF control or PID control with an accuracy of, for example, an error of 0.1 ° C. on the refrigerant circulation valves of the refrigerators 1 and 10 according to the settings are provided by the ultra-low temperature calibration device 100. It is provided so that setting operation can be performed in front of the camera. The display lamps 171 and 172 and the power switches 181 and 182 are provided near the temperature controllers 161 and 162.
[0031]
Movement wheels 190 are provided near the four corners of the bottom surface of the ultra-low temperature calibration device 100, and handles 200 are provided on both side surfaces. The ultra-low temperature calibration device 100 is configured to be driven at AC 100V. The weight of the ultra-low temperature calibration device 100 thus configured is about 45 kg, and can be transported and moved by two people.
The size of the entire ultra-low temperature calibration apparatus 100 is, for example, 550 mm in width, 500 mm in height, and 470 mm in depth.
[0032]
Referring again to FIG. 1, the ultra-low temperature calibration of the temperature sensor 1 to be calibrated is performed by using the temperature sensor 1 to be calibrated connected to the display device via a signal cable together with the standard temperature sensor 7 in the tubular liquid tanks 121 and 122 of the ultra-low temperature calibration device 100. Insert it into any of them and perform the actual temperature calibration. In the example of FIG. 1, the temperature sensor 1 to be calibrated inserted into the freezer 2 so as to measure the internal temperature of the freezer 2 is inserted into the tubular liquid tank 121 while being connected to the chart recorder 5 used as a display device. ing.
[0033]
With this system configuration, the traceability of the temperature in the ultra-low temperature calibration device 100 has been proven by the combination of the standard temperature sensor 1 and the standard digital thermometer 9 used as a display device. By comparing the indicated temperature value with the indicated temperature value of the chart recorder 5, it is possible to prove the traceability of the entire ultra-low temperature measuring apparatus including the temperature sensor 1 to be calibrated, the signal cable, and the chart recorder 5 as a display device. .
[0034]
Here, since the ultra low temperature calibration apparatus 100 is provided with two tubular liquid tanks 121 and 122, the other tubular liquid tank 122 is used for pre-cooling a plurality of temperature sensors or performing two-point calibration. By setting the calibration temperature at the other point, a more efficient calibration operation can be performed.
[0035]
By using the ultra-low temperature calibration device 100 that can be transported in this way, the traceability of the entire ultra-low temperature measurement device including the temperature sensor to be calibrated, the signal cable, and the display device, which could not be performed in the field by the conventional method, is proved in a short time. it can. More specifically, it takes one month in the case of a conventional calibration operator factory collection, but the present invention can be implemented in one day.
[0036]
By changing the temperature tank of the ultra-low temperature calibration apparatus 100 from the air tank to the tubular liquid tanks 121 and 122, the solution bottle to be injected into the tubular liquid tanks 121 and 122 can be pre-cooled with dry ice or the like in advance. And the temperature ON-OFF control by the temperature controllers 161 and 162, the target temperature arrival time becomes about 15 minutes, which is 1/5 or less as compared with the conventional air tank, and furthermore, the PID control Work efficiency is dramatically improved by realizing temperature stabilization.
[0037]
In order to operate the refrigeration equipment during the period of the conventional calibration company factory take-back calibration, a temperature sensor for a replacement was necessary.However, the present invention eliminates the cost of purchasing, maintaining and maintaining them, and the cost of installing and removing replacements. Significant cost reduction.
As described above, the work efficiency is improved by a factor of 5 or more, so that the number of work steps is significantly reduced as compared with the related art.
[0038]
Furthermore, it is a technology that meets the recent demands for ultra-low temperature control in the pharmaceutical business (biotechnology, GMP, GLP) and the food business (HACCP). Depending on the type of solution, ultra-low temperature calibration at -100 ° C or lower is also possible. It is.
[0039]
The ultra-low temperature calibration device 100 can also be used as a sample constant temperature cooling device. That is, since the internal temperatures of the tube-shaped liquid tanks 121 and 122 can be controlled at ± 0.1 ° C., for example, a test tube or the like containing a sample is simply put into the tube-shaped liquid tanks 121 and 122 with the lids 131 and 132 opened. The temperature can be easily and accurately cooled to the lower limit of the temperature of about -150 ° C.
[0040]
【The invention's effect】
As described above, according to the present invention, at or near the installation location of a temperature sensor to be calibrated, an ultra-low temperature calibration method capable of performing actual temperature calibration as an entire ultra-low temperature measurement device including a temperature sensor to be calibrated, a signal cable, and a display device And an ultra-low temperature calibration device can be realized, and can respond to various demands of ultra-low temperature range management represented by the pharmaceutical business and the food business field.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram showing the configuration of an embodiment of the present invention.
FIG. 2 is an explanatory diagram of a configuration of an ultra-low temperature calibration device 100 used in FIG.
FIG. 3 is a diagram illustrating a general use example of an ultra-low temperature sensor.
FIG. 4 is an explanatory diagram showing a conventional temperature calibration example.
FIG. 5 is a flowchart showing a procedure of a conventional temperature calibration example.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 Temperature sensor to be calibrated 2 Freezer 3 Temperature sensor mounting section 4 Paperless recorder 5 Clock phase detection 6 Monitoring and recording device 7 Standard temperature sensor 9 Digital thermometer 100 Ultra-low temperature calibration device 1/10 Refrigerator 121 ・ 122 Tube type liquid tank 131 ・ 132 Lids 141 and 142 Guide bodies 151 and 152 Outlets 161 and 162 Temperature controllers 171 and 172 Indicator lamps 181 and 182 Power switch 190 Wheel 200 for movement Handle

Claims (9)

A cryogenic calibration device movably configured is transported to or near the place where the temperature sensor to be calibrated connected to the display device via the signal cable is installed, and the device connected to the display device via the signal cable. An ultra-low temperature calibration method characterized by performing actual temperature calibration of a temperature sensor to be calibrated by inserting a calibration temperature sensor into an ultra-low temperature calibration device together with a standard temperature sensor. As an ultra-low temperature calibration device,
A tubular liquid tank into which a cooling liquid is injected by cooling in a refrigerator, and a temperature sensor to be calibrated and a standard temperature sensor are inserted to the same depth according to a guide,
A temperature controller that controls the refrigerator so that the inside of the tubular liquid tank has a desired ultra-low temperature;
2. The ultra-low temperature calibration method according to claim 1, wherein a method including a moving wheel mounted on a bottom surface of the apparatus is used. Ultra low temperature calibration equipment
At least two tubular liquid tanks;
3. The ultra-low temperature calibration method according to claim 1, further comprising a temperature controller for individually controlling the temperatures of the tubular liquid tanks. 4. The ultra-low temperature calibration method according to claim 2, wherein a cooling liquid outlet is provided at a bottom of the tubular liquid tank. A detachable lid is provided at the opening of the tubular liquid tank, and a guide for positioning the insertion depth of the temperature sensor to be calibrated and the standard temperature sensor is integrated with the lid. 5. The ultra-low temperature calibration method according to any one of 4. A tubular liquid tank into which a cooling liquid is injected by cooling in a refrigerator, and a temperature sensor to be calibrated and a standard temperature sensor are inserted to the same depth according to a guide,
A temperature controller that controls the refrigerator so that the inside of the tubular liquid tank has a desired ultra-low temperature;
An ultra-low temperature calibration device, comprising: a moving wheel mounted on a bottom surface of the device. At least two tubular liquid tanks;
7. The ultra-low temperature calibration device according to claim 6, further comprising a temperature controller for individually controlling the temperatures of the tubular liquid tanks. 8. The ultra-low temperature calibration apparatus according to claim 6, wherein a cooling liquid outlet is provided at a bottom of the tubular liquid tank. 7. A detachable lid is provided at an opening of the tubular liquid tank, and a guide for positioning an insertion depth of the temperature sensor to be calibrated and the standard temperature sensor is integrated with the lid. 8. The ultra-low temperature calibration device according to any one of 8.

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