JP2007127487A - Calibration method of temperature data logger, and soaking block used therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a procedure capable of calibrating highly accurately a temperature data logger with a clock function equipped with an internal memory, and a soaking block. <P>SOLUTION: The temperature data logger 1 with the clock function equipped with the internal memory M and a reference thermometer 2 connected to a computer 7 installed out of a bath through a measuring device are provided in a constant-temperature bath 6 through soaking blocks 3-5, and the temperature of the constant-temperature bath is raised or lowered, and measurement data by the reference thermometer 2 are stored in a storage means of the computer 7. The temperature data logger 1 taken out from the constant-temperature bath is connected to the computer 7, and measurement data stored in the internal memory M are stored in the storage means of the computer 7, and a calibration result acquired by allowing each time base of the measurement data by the reference thermometer 2 and the measurement data by the temperature data logger 1 to agree with each other by an operation means of the computer 7 is output. The soaking blocks 3-5 include an insertion part for inserting the reference thermometer 2 and a storage part for covering and storing the whole temperature data logger 1 in the state having almost no clearance. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a temperature data logger calibration method and a soaking block used therefor, and more particularly to a temperature data logger calibration method with a clock function for measuring temperature and storing it in an internal memory, and a soaking block used therefor. .

  Measurements that can be used to verify the effectiveness of heat sterilization and sterilization processes in the food and pharmaceutical industries, that is, validation, that is, temperature measurement data is stored in a sensor, and the stored data is imported to a personal computer with the attached interface after the measurement is completed. The system is widespread. As an example of a temperature sensor used in such a measurement system, US Mesa Laboratories Inc. handled by Seika Sangyo Co., Ltd. There is Datatrace made by Such a temperature sensor is small and wireless, so it can measure a variety of moving objects, and it is also used in Japan for convenience, such as being attached to an airtight device such as an autoclave. It has been broken.

  In recent years, in order to improve the accuracy of measurement using a temperature sensor as described above, the importance of front-rear calibration (calibration) has increased, and establishment of traceability of calibration has been demanded.

  As a method for efficiently and accurately calibrating the temperature sensor, a temperature sensor calibration furnace consisting of a circular soaking block with point-symmetrical measurement holes, a heater arranged at the lower end, and a heat insulating material arranged in a circle is provided. A technique used has been proposed (see, for example, Patent Document 1). Further, as a technique for reaching the set temperature early and performing a comparative calibration test at many set temperatures in a short cycle, a technique of forming a soaking block with silver or a silver alloy has been proposed (for example, see Patent Document 2). ).

  However, these conventional methods are intended to calibrate a temperature sensor with a wire that measures temperature in real time, and are not compatible with a wireless type temperature sensor that stores measurement data in an internal memory. Calibration is performed with a part exposed from the soaking block and in direct contact with the outside air.

JP 2004-132941 A JP-A-8-136361

  Therefore, in view of the above-described situation, the present invention intends to solve a technique capable of calibrating a temperature sensor with a clock function of a type that stores data in an internal memory, that is, a temperature data logger, with high accuracy. It is in the point which provides the soaking block used for it.

  The temperature data logger calibration method according to the present invention includes a temperature data logger with a clock function for measuring a temperature and storing it in an internal memory, and a measuring instrument in a computer installed outside the bus in order to solve the above-mentioned problem. A procedure for providing a reference thermometer connected in the thermostatic bath via a soaking block, a procedure for raising or lowering the thermostatic bath, and storing measurement data by the reference thermometer in the storage means of the computer, The temperature data logger taken out from the constant temperature bath is connected to a computer, and the measurement data stored in the internal memory is stored in the storage means of the computer and stored in the storage means by the calculation means of the computer. A procedure for outputting a calibration result by matching the time axis of the measurement data of the reference thermometer and the measurement data of the temperature data logger, Characterized by comprising.

  Here, before providing the temperature data logger in the constant temperature bath, it is preferable to connect to a computer and input temperature measurement conditions including a measurement interval in advance.

  Furthermore, it is preferable that the method of outputting the calibrated result is a method of extracting a predetermined section in which both measurement data have converged within a predetermined variation by the calculating means and outputting an average value of both extracted data.

  Moreover, it is preferable that the soaking block covers and accommodates the entire temperature data logger so that there is substantially no gap.

  Further, the temperature data logger is configured by a main body portion storing the internal memory and a sensor portion protruding from the main body portion, and the soaking block receives the sensor portion of the temperature data logger stored downward. In addition, it is preferable that the sensor block for receiving the sensor portion at the tip of the reference thermometer and the body block for storing the body portion of the temperature data logger and holding the body portion of the reference thermometer are divided.

  Further, the soaking block according to the present invention is a soaking block used in the calibration method, and there is substantially no gap between the insertion portion for inserting the reference thermometer and the entire temperature data logger. And a storage unit that covers and stores the state.

  Further, the soaking block receives a sensor portion at the tip of the temperature data logger stored downward, and houses a sensor block for receiving the sensor portion at the tip of the reference thermometer, and the main body of the temperature data logger. The main body block for holding the main body portion of the reference thermometer is preferably divided and the temperature data logger and the reference thermometer are inserted along the vertical direction of the main body block. Each of the sensor block of the temperature data logger and the tip of the reference thermometer at each position corresponding to the through hole in the sensor block fitted to the lower end of the main body block. It is more preferable to provide a bottomed storage hole into which the sensor unit is inserted.

  The soaking block is preferably provided with a rod-shaped block that is inserted into a through-hole for inserting the temperature data logger, and closes an excess space above the stored temperature data logger main body. More preferably, a heat insulating material is interposed between the sensor block and the main body block to be joined together.

  According to the temperature data logger calibration method according to the present invention as described above, the time axis of the measurement data of the reference thermometer and the measurement data of the temperature data logger stored in the storage means is calculated by the computing means of the computer. By outputting the calibration result together, it is possible to calibrate the temperature data logger with a clock function of the type that accumulates data in the internal memory with high accuracy.

  In addition, since the temperature measurement condition including the measurement interval is input in advance to the temperature data logger, the measurement timing can be made to be exactly the same and the calibration accuracy can be improved.

  Further, the method of outputting the calibrated result by the computing means of the computer extracts a predetermined section where both measurement data converged within a predetermined variation by the computing means, and outputs an average value of both extracted data. With this feature, even if a slight deviation occurs in the time axis of both measurement data, the influence on the calibration accuracy can be almost eliminated, and calibration with higher accuracy is possible.

  By the way, when trying to calibrate a small wireless temperature data logger with high accuracy, the temperature data logger with a small heat capacity comes into contact with the outside air and radiates heat, as well as the thermal conductivity bias and air in the soaking block. The influence of the temperature gradient in the soaking block due to the convection is not negligible. Therefore, it is a problem to improve the thermal stability of the entire calibration apparatus and sufficiently reduce the uncertainty of calibration, but in the present invention, the temperature data logger is entirely free of gaps with a soaking block. By covering and storing, the influence of heat radiation can be prevented without bringing the logger into contact with outside air, and calibration can be performed with higher accuracy. Furthermore, the soaking block receives the sensor part of the temperature data logger stored downward and the sensor block that accepts the sensor part at the tip of the reference thermometer, and the main part of the temperature data logger and the main part of the reference thermometer The main body block is configured to be divided into a main body block for holding a portion, and through holes for inserting the temperature data logger and the reference thermometer are respectively provided along the vertical direction of the main body block. A bottomed storage hole into which the sensor portion of the temperature data logger and the sensor portion at the tip of the reference thermometer are respectively inserted is provided at each position corresponding to the through hole in the sensor block to be attached to the sensor block. By aligning the top and bottom of the sensor block with the reference thermometer tip and the temperature data logger sensor To easily and by replacing only one of the sensor block or main body block, varying length becomes to correspond to the data logger shape.

Further, the soaking block is inserted into a through-hole for inserting the temperature data logger, and a rod-shaped block for closing the excess space above the stored temperature data logger main body is provided, thereby The entire data logger can be easily covered and stored without gaps, and the temperature data logger can be prevented from coming into contact with the outside air, eliminating temperature changes due to heat radiation to the outside air. Thus, it is possible to prevent a temperature gradient from being generated in the soaking block due to air convection in the space.
Furthermore, the rod-shaped block is made of the same material as that of the main body block, so that the thermal conductivity in the soaking block is made uniform and the temperature stability inside is excellent.

  Further, by interposing a heat insulating material between the sensor block and the main body block to be bonded to each other, the internal temperature stability is further improved.

  Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is an explanatory view showing an outline of the overall configuration of a calibration apparatus used in the present invention, and more specifically shows a cross section along line AA in FIG. 3 to be described later. FIG. 2 is a perspective view showing a typical embodiment of a soaking block according to the present invention, and FIG. 3 shows a temperature data logger and a reference thermometer in the soaking block according to the representative embodiment of the present invention. FIG. 4 is a cross-sectional view of the sensor block in the heat equalizing block according to the representative embodiment of the present invention. ing. FIG. 5 shows a sensor insertion guide member in another embodiment of the soaking block according to the present invention. Further, FIG. 6 shows an outline of the procedure of the calibration method according to the present invention.

  The temperature data logger 1 to be calibrated is of a wireless type having an internal memory M and has a clock function. As a usage method, for example, connect to a personal computer using an interface, set temperature measurement conditions such as measurement start time and measurement interval in advance, and then perform automatic temperature measurement according to the temperature measurement conditions, and then connect to a personal computer again. The temperature measurement data recorded in the internal memory M is collected. As its application, for example, refrigeration, refrigerator temperature management, atmospheric temperature for natural environment investigation, water temperature measurement, room temperature measurement in a vinyl house, and so on.

  The reference thermometer 2 (more specifically, 2A or 2B) used in the present invention has a high degree of uncertainty, such as a JCSS certified standard thermometer or a thermometer calibrated by the standard thermometer. The thermometer is preferably a precision thermometer, but is not limited to these. Here, it refers to a thermometer used as a reference when the temperature data logger 1 is calibrated. As such a reference thermometer 2, a platinum resistance thermometer, a thermocouple, etc. can be used suitably according to the temperature to calibrate, for example. In FIG. 2, although two reference thermometers 2A and 2B are shown, only one reference thermometer is used in the calibration method according to the present invention, and the other is described later in the embodiment. The reference thermometer is a standard for calibrating the reference thermometer in advance, and shows a more accurate standard thermometer and the like.

  The soaking block of the present invention includes an insertion portion for inserting the reference thermometer 2 and a storage portion for storing the temperature data logger 1. At the time of calibration, the temperature data logger 1 and the reference temperature are stored. In order to accurately transmit the calibration temperature set by the temperature control means 9 described later to the total 2, it has a function of keeping the internal temperature uniform. If a temperature gradient occurs in the soaking block, it becomes a calibration error and directly affects the calibration accuracy. Therefore, it is essential to make the temperature in the soaking block uniform to improve the calibration accuracy. .

  In view of this, the heat equalizing block of the present invention has a structure in which the entire temperature data logger 1 is covered and accommodated in a substantially gap-free state in order to make the internal temperature uniform. Thus, by storing the entire temperature data logger 1 in a soaking block, it is possible to eliminate a temperature change caused by the temperature data logger 1 coming into contact with the outside air to dissipate heat.

  Next, various embodiments of the soaking block of the present invention will be described in more detail based on FIGS. 1 to 5, but the calibration method according to the present invention is limited to the case where these soaking blocks are used. Is not to be done.

  A typical embodiment of the soaking block according to the present invention includes a sensor block 4 for receiving the sensor part 1a at the tip of the temperature data logger stored downward and the sensor part 2a at the tip of the reference thermometer, It comprises a main body block 3 for housing the main body 1b of the temperature data logger and holding the main body of the reference thermometer 2, and a rod-like block 5 described later. Furthermore, through holes 11 and 12a and 12b for inserting the temperature data logger 1 and the reference thermometer 2 are provided along the vertical direction of the main body block 3, respectively, at the lower end of the main body block 3 The bottom of the sensor block 4 to be fitted is fitted to the sensor portion 1a of the temperature data logger and the sensor portion 2a at the tip of the reference thermometer at positions corresponding to the through holes 11 and 12a, 12b, respectively. The fitting holes 13 and 14a, 14b are provided. Thus, the effect by dividing | segmenting a soaking | uniform-heating block is as above-mentioned.

  The rod-shaped block 5 is inserted into the through-hole 11 for inserting the temperature data logger, and is used to close the excess space above the stored temperature data logger main body. In addition, when the soaking block is divided and configured as in the present embodiment, instead of using such a rod-shaped block 5, the through hole 11 is not provided in the main body block 3, and the logger main body from below the main body block. It is good also as what provided the bottomed storage hole which can accommodate the part b. In this case, before the main body block 3 and the sensor block 4 are bonded together, the temperature data logger 1 is previously inserted into the bottomed storage hole of the main body block 3 or the bottomed fitting hole 13 of the sensor block 4. After setting, the sensor block 4 and the main body block 3 may be joined together.

  In the present embodiment, the shape of the soaking block is exemplified by a cylindrical shape, but is not limited to this, and can be appropriately determined in consideration of how heat is transmitted.

  Further, the material of the soaking block can be appropriately selected in consideration of the thermal conductivity, but in this embodiment, the material of each of the blocks 3 to 5 is adopted in order to adopt aluminum and make the thermal conductivity constant. Are all the same.

  When the main body block 3 and the sensor block 4 are bonded together, it is important to prevent a gap from occurring in order to make the temperature inside the soaking block uniform. Therefore, as a method for attaching these blocks, in the present embodiment, the convex portion 24 is provided on the bottom surface of the main body block 3, and the concave portion 25 is provided on the upper surface of the sensor block 4, and these are fitted and screwed. A structure that is firmly fixed without gaps by being fixed by 21 is adopted, but is not limited to such a structure, and besides being screwed with a screw, for example, a structure that can be attached and detached with a single touch, such as a clamp It is also preferable to do.

  When the temperature data logger 1 is inserted into the soaking block, after the main body block 3 and the sensor block 4 are joined together in advance, the temperature data logger 1 is gently inserted from the through hole 11 on the upper surface of the main body block 3. The sensor block 1a of the temperature data logger may be inserted into the bottomed fitting hole 13 of the sensor block 4 before the body block 3 and the sensor block 4 are attached. The data logger 1 may be disposed gently, and then the sensor block 4 on which the temperature data logger 1 is disposed may be attached so as to cover the main body block 3. In the present embodiment, the bottomed fitting hole 13 of the sensor block 4 is provided with an enlarged diameter portion 8 for guiding the sensor portion so that the sensor portion 1a of the temperature data logger can be easily received.

  According to the soaking block according to such a representative embodiment, the internal temperature can be made uniform with very high accuracy as shown in the examples described later. In order to further ensure the uniformity of the temperature, the temperature data logger 1 and the reference thermometer 2 are inserted or stored in the following arrangement.

  That is, the insertion positions of the temperature data logger 1 and the reference thermometer 2 are adjusted to match the depths of the bottomed fitting holes 13 and the bottomed fitting holes 14a and 14b of the sensor block 4, as shown in FIG. Accordingly, the sensor section 1a of the temperature data logger 1 and the temperature sensing section 2a of the reference thermometer 2 are set to have the same insertion depth in the sensor block 4, and thereby the temperature in the vertical direction of the soaking block is set. Even if there is a slight gradient, the influence on the calibration accuracy can be eliminated.

  Further, as shown in FIG. 3, the soaking block according to the present embodiment is capable of simultaneously storing and calibrating a plurality of temperature data loggers 1, and in the main body block for receiving the temperature data logger 1. The through-hole 11 and the fitting hole 13 in the sensor block, the through-holes 12a and 12b in the main body block for receiving the reference thermometer 2, and the fitting holes 14a and 14b in the sensor block are respectively provided with a soaking block shaft. By adopting a structure that is arranged on a concentric circle centered on the center, even if there is a slight temperature gradient in the horizontal direction of the soaking block, the influence on the calibration accuracy can be eliminated.

  Further, in the soaking block of the type in which a plurality of temperature data loggers 1 can be simultaneously inserted as in this embodiment, for example, when only one temperature data logger is to be calibrated, the temperature data logger to be calibrated is used. By inserting a dummy member having the same shape and the same material as the soaking block into the other through hole 11 and fitting hole 13, the internal space can be filled and the thermal conductivity in the block can be kept uniform. It is possible that no temperature gradient is generated in the soaking block.

  As another embodiment of the soaking block of the present invention, a heat insulating material (not shown) may be interposed between the sensor block 4 and the main body block 3. Even if a slight temperature gradient in the vertical direction is generated in the main body block 3 by interposing a heat insulating material, the sensor block that requires the highest uniformity of temperature among the soaking blocks. No. 4 is thermally blocked from the main body block 3, and high temperature uniformity can be maintained.

  Furthermore, as another embodiment of the soaking block of the present invention, a guide member 31 shown in FIG. 5 may be employed. In the soaking block according to the above-described representative embodiment, when the temperature data logger is inserted, the main body block 3 and the sensor block 4 are bonded together in advance as described above, and then the main body block 3. When the method of inserting the temperature data logger 1 gently from the through hole 11 on the upper surface is adopted, if the handling becomes messy, the impact caused by colliding with the soaking block when the temperature data logger 1 is inserted into a predetermined position. Therefore, the possibility that the function of the internal memory M will be affected cannot be discarded. Therefore, the temperature data logger 1 is set in advance on the guide member 31, and the guide member 31 and the guide member 31 are inserted into the main body block 3 provided with the guide member insertion space 15, so that the impact can be applied slowly and reliably. The temperature data logger 1 can be inserted into the soaking block without giving it. The illustrated guide member 31 is obtained by fixing three frame members 31a to the bottom member 31b using screws 31c. However, the structure is not limited to such a structure. For example, two or more frame members are provided. It can also be the type used. In consideration of heat transfer, the guide member 31 is preferably made of the same material as the soaking block.

  The constant temperature bath 6 used in the present invention can be the same as the conventional one. In this embodiment, the temperature control means 9 is provided, and the temperature control means 9 receives the soaking block and controls the calibration temperature by the temperature control means 9. It is what has. The constant temperature bath 6 may be a dry bath or a liquid bath. Of these, the liquid bath is superior in the ability to keep the temperature uniform. One dry bath has the advantage that no vapor is generated during use, unlike a liquid bath. The temperature control means 9 is not particularly limited as long as it can control the calibration temperature, but not only the temperature can be set, but also the one that can set the temperature rise and fall freely with respect to the time axis is suitable. is there. As an example, there is a Peltier module that can be both cooled and heated and that can be easily controlled in temperature.

As the computer 7 used in the present invention, any computer provided with a storage means capable of storing measurement data from the temperature data logger 1 or the reference thermometer 2 and a calculation means for calculating these measurement data. It can be used and is not particularly limited.
Note that the reference thermometer 2, the constant temperature bath 6, the temperature control means 9 and the computer 7 may be used separately connected to each other. For example, the reference thermometer 2, the constant temperature bath 6, the temperature control means 9 may be used. Of course, an apparatus in which the computer 7 is integrated may be used.

  The temperature data logger calibration method according to the present invention includes a temperature data logger 1 having a clock function for measuring temperature and storing it in an internal memory, and a reference temperature connected to a computer 7 installed outside the bus via a measuring instrument. A procedure for providing the total 2 in the constant temperature bath 6 via a soaking block, a procedure for raising or lowering the temperature of the constant temperature bath, and storing measurement data from the reference thermometer 2 in the storage means of the computer 7, and a constant temperature The temperature data logger 1 taken out from the bus 6 is connected to the computer 7, and the measurement data stored in the internal memory M is stored in the storage means of the computer 7 and stored by the calculation means of the computer 7. A procedure for outputting the result of calibration by matching the time axis of the measurement data of the reference thermometer stored in the means and the measurement data of the temperature data logger; Equipped with a. As the calibration temperature, a plurality of levels may be set as in the embodiment described later, and the calibration may be performed sequentially at each temperature, or only one specific level may be set.

  Hereinafter, the calibration accuracy in the case of performing calibration by the temperature data logger calibration method according to the present invention was evaluated by estimating the uncertainty of calibration.

(Soaking block)
The soaking blocks 3 to 5 according to the representative embodiments of the present invention shown in FIGS. 2 to 4 were used.

(Temperature data logger)
As a temperature data logger 1 to be calibrated, US Mesa Laboratories Inc., handled by Seika Sangyo Co., Ltd. “Datatrace” manufactured by the same company was used. This is a data logger with a clock function that stores data in the internal memory M wirelessly.

(Reference thermometer)
As the reference thermometer 2, a practical standard resistance thermometer approved by JCSS owned by Yamazato Sangyo Co., Ltd. was used. Needless to say, the practical standard resistance thermometer is used together with a precision resistance measuring instrument.

(Constant temperature bath)
As the constant temperature bath 6 having the temperature control means 9, “Hydra (manufactured by Isothermal Technology, UK, liquid bath, calibration temperature range −60 ° C. to 300 ° C.)” having excellent temperature stability in the bath was used.

(Calibration temperature)
Calibration was performed at three levels of -20 ° C, 121 ° C, and 138 ° C.

(Temperature data logger calibration procedure)
Calibration of the temperature data logger 1 was performed according to the procedure shown in FIG. That is, the temperature data logger 1 is connected to the computer 7, and the measurement start time, end time, and measurement interval are input in advance to the temperature data logger 1 with reference to the clock built in the computer 7 (S101). The temperature data logger 1 to which the temperature measurement condition has been input is stored in the soaking blocks 3 to 5 (S102), and the soaking blocks 3 to 5 storing the temperature data logger 1 are installed in the constant temperature bath 6 (S103). 1), the reference thermometer 2 connected to the computer 7 installed outside the bus via a measuring instrument was inserted into the soaking block, and a calibration device as shown in FIG. 1 was assembled (S104). The soaking block is provided with two holes for inserting the reference thermometer 2. However, a dummy member made of the same material as the main body block is inserted into the hole where the reference thermometer 2 is not inserted. It was worn so that there was no space inside. Subsequently, the temperature control means 9 raises or lowers the temperature of the constant temperature bath 6 to set the calibration temperature in the order of −20 ° C., 121 ° C., and 138 ° C. (S105), and the reference thermometer 2 at each calibration temperature. Is stored in the storage means of the computer 7 in real time (S106), and after the measurement is completed at all calibration temperatures, the temperature data logger 1 is taken out of the soaking block and connected to the computer 7 (S107). The measurement data stored in M was collected in the storage means of the computer 7 (S108). Furthermore, the time axis of the measurement data of the reference thermometer 2 and the measurement data of the temperature data logger 1 stored in the storage means is matched by the calculation means of the computer 7 (S109), and -20 ° C, 121 ° C, 138 ° C. At each calibration temperature, a predetermined interval in which both measured data converge within a predetermined variation is extracted (S110a), an average value of both extracted data is calculated (S110b), and the calculated result is output (S110c). Thus, the temperature data logger 1 was calibrated.

  In the present embodiment, in the above procedure (S110a), as a method of extracting a predetermined section in which both measurement data have converged within a predetermined variation, the condition of the section to be extracted in advance by the computing means of the computer 7 (for example, A temperature variation range of measurement data is set, and a method of automatically extracting a predetermined section by the calculation means is adopted. Furthermore, in the procedure (S110b), as a method of calculating the average value of both extracted data, a condition for calculating the average value of both extracted data is set in advance in the calculating means of the computer 7, and the calculating means automatically The method of calculating the average value of both extracted data was adopted.

  Further, in this embodiment, the method of extracting each predetermined section where both measurement data converged within the predetermined variation in (S110a) is adopted. However, in the temperature data logger calibration method according to the present invention, both measurement data are used. The extraction method is not limited to this. For example, for the measurement data of the reference thermometer, a predetermined section converged within the predetermined variation is extracted, and for the measurement data of the temperature data logger, the measurement of the reference thermometer is performed. You may extract the same area with respect to the predetermined area and time axis in data.

(Calibration uncertainty)
Table 1 shows the calibration accuracy when the temperature data logger 1 is calibrated as described above, that is, the standard uncertainty of calibration. Uncertainty evaluation is based on the uncertainty of the reference thermometer, measurement uncertainty, horizontal temperature distribution of the soaking block installed in the hydra, vertical temperature distribution of the soaking block installed in the hydra, temperature data logger Each factor of stability and resolution of measurement data was performed. Among these, the “uncertainty” regarding the stability of the measurement data by the temperature data logger 1 was estimated by calculating the standard deviation from 90 pieces of data for 15 minutes at each calibration temperature.

  In Example 1, the estimation of “uncertainty” was quantitatively evaluated based on Guide to the Expression of Uncertainty in Measurement (GUM).

  As shown in Table 1, the expansion uncertainty is 0.07 to 0.08 ° C., and it has been found that the wireless type temperature data logger can be calibrated with high accuracy according to the temperature data logger calibration method of the present invention.

(Soaking block)
Similarly to Example 1, soaking blocks 3 to 5 according to representative embodiments of the present invention shown in FIGS. 2 to 4 were used.

(Temperature data logger)
As in Example 1, as temperature data logger 1 to be calibrated, US Mesa Laboratories Inc., handled by Seika Sangyo Co., Ltd. “Datatrace” manufactured by the same company was used.

(Reference thermometer)
As the reference thermometer 2, a temperature indicator attached to a constant temperature bath described later was used.

(Constant temperature bath)
As the constant temperature bath 6, “High Parion S (manufactured by Isothermal Technology, UK, calibration temperature range −20 ° C. to 140 ° C.)” was used. The High Parion S comes with a temperature indicator that displays the temperature in the constant temperature bath on the monitor in real time. Moreover, the temperature control means 9 in the high parion S uses a Peltier element and is excellent in temperature control characteristics. The high parion S can be used as a liquid bath or a dry bath, but in this embodiment, it was used as a dry bath.

(Calibration temperature)
In the same manner as in Example 1, calibration was performed at three levels of −20 ° C., 121 ° C., and 138 ° C.

(Temperature data logger calibration procedure)
First, the temperature indicator attached to the Hyperion S was calibrated using a JCSS certified practical standard resistance thermometer owned by Yamazato Sangyo Co., Ltd. The temperature indicator calibrated in this way is used as the reference thermometer 2 and the same procedure as in Example 1 is used except that the high temperature ion 6 is used instead of the hydra as the constant temperature bath 6 provided with the temperature control means 9. The temperature data logger was calibrated.

  That is, as shown in FIG. 6, the temperature data logger 1 is connected to the computer 7, and the measurement start time, end time, and measurement interval are input to the temperature data logger 1 in advance with reference to the clock built in the computer 7 ( S101), the temperature data logger 1 having entered the temperature measurement conditions as described above is stored in the soaking blocks 3-5 (S102), and the soaking blocks 3-5 containing the temperature data logger 1 are further stored in the constant temperature bath 6. (S103), a reference thermometer 2 connected to a computer 7 installed outside the bus via a measuring instrument was inserted into the soaking block, and a calibration device as shown in FIG. 1 was assembled ( S104). The soaking block is provided with two holes for inserting the reference thermometer 2. However, a dummy member made of the same material as the main body block is inserted into the hole where the reference thermometer 2 is not inserted. It was worn so that there was no space inside. Subsequently, the temperature control means 9 raises or lowers the temperature of the constant temperature bath 6 to set the calibration temperature in the order of −20 ° C., 121 ° C., and 138 ° C. (S105), and the reference thermometer 2 at each calibration temperature. Is stored in the storage means of the computer 7 in real time (S106), and after the measurement is completed at all calibration temperatures, the temperature data logger 1 is taken out of the soaking block and connected to the computer 7 (S107). The measurement data stored in M was collected in the storage means of the computer 7 (S108). Furthermore, the time axis of the measurement data of the reference thermometer 2 and the measurement data of the temperature data logger 1 stored in the storage means is matched by the calculation means of the computer 7 (S109), and -20 ° C, 121 ° C, 138 ° C. At each calibration temperature, a predetermined interval in which both measured data converge within a predetermined variation is extracted (S110a), an average value of both extracted data is calculated (S110b), and the calculated result is output (S110c). Thus, the temperature data logger 1 was calibrated. In the present embodiment, in the above procedure (S110a), as a method of extracting a predetermined section in which both measurement data have converged within a predetermined variation, the condition of the section to be extracted in advance by the computing means of the computer 7 (for example, A temperature variation range of measurement data is set, and a method of automatically extracting a predetermined section by the calculation means is adopted. Furthermore, in the procedure (S110b), as a method of calculating the average value of both extracted data, a condition for calculating the average value of both extracted data is set in advance in the calculating means of the computer 7, and the calculating means automatically The method of calculating the average value of both extracted data was adopted.

(Calibration uncertainty)
Among the evaluation results of the calibration accuracy when the temperature data logger 1 is calibrated as described above, that is, the standard uncertainty of calibration, the uncertainty of the practical standard resistance thermometer, the uncertainty of measurement, Table 2 shows the evaluation results regarding each factor of the horizontal temperature distribution of the installed soaking block, the vertical temperature distribution of the soaking block installed in the Hyperion S, the stability of the measurement data of the reference thermometer 2, and the resolution.

  Among the uncertainty factors shown in Table 2, regarding the horizontal temperature distribution of the soaking block installed in the high parion S, the bottomed fitting hole 14a for receiving the reference thermometer 2 and the six for receiving the temperature data logger. It calculated from the temperature difference between the bottomed fitting holes 13 (six holes are A hole to F hole, respectively). In addition, regarding the vertical temperature distribution of the soaking block installed in the high parion S, it is assumed that the temperature sensing element in the sensor section 1a of the temperature data logger is within a mounting variation range of about 10 mm at the maximum, and normal temperature data It was calculated from the temperature difference between the logger storage position and a position shifted by 10 mm from the position upward in the soaking block. Table 3 shows the results of evaluating the uncertainties regarding the horizontal temperature distribution and the vertical temperature distribution of the soaking block installed in the high parion S in this way.

  In Example 2, the estimation of “uncertainty” was quantitatively evaluated based on GUM as in Example 1.

  The expanded uncertainty shown in Table 2 is 0.10 to 0.11 ° C., and the uncertainty related to the stability and resolution of the measurement data of the temperature data logger 1 is combined with this, the temperature data logger in Example 2 is −20 ° C. The expanded uncertainty (95% confidence) of calibration at 121 ° C. and 138 ° C. was approximately the same value as the expanded uncertainty shown in Table 2, ± 0.11 ° C. This is because, for example, the uncertainty regarding the stability and resolution of the measurement data at −20 ° C. of the temperature data logger 1 is ± 0.0097 ° C., compared to the synthetic standard uncertainty ± 0.054 ° C. at −20 ° C. shown in Table 2. Because it was small enough.

  Thus, even when the temperature indicator attached to the Hyperion S is used as the reference thermometer 2, the temperature data logger calibration method according to the present invention calibrates the wireless type temperature data logger with high accuracy. I understood that I could do it.

(Calibration result)
The results when the temperature data logger 1 is calibrated as in Example 2 are described in a calibration report as shown in Table 4, for example.

  In Table 4, the calibration temperature refers to the temperature indicated by the reference thermometer 2.

  Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and can of course be implemented in various forms without departing from the gist of the present invention.

Explanatory drawing which shows the outline | summary of the calibration apparatus which concerns on embodiment of this invention. The perspective view which shows typical embodiment of the heat equalization block which concerns on this invention. Sectional drawing in the state which inserted the temperature data logger and the reference | standard thermometer in the soaking block which concerns on typical embodiment of this invention, and installed this in the thermostat bath. The top view of the block for sensors in the soaking | uniform-heating block which concerns on typical embodiment of this invention The perspective view of the guide member for sensor insertion in other embodiment of the heat equalization block which concerns on this invention. Explanatory drawing which shows the outline | summary of the procedure of the calibration method which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Temperature data logger 1a Sensor part 1b Main body part 2 Reference thermometer 2a Sensor part 3 Main body block 4 Sensor block 5 Rod-shaped block 6 Constant temperature bath 7 Computer 8 Expanded part 9 Temperature control means 11 Through hole 12a, 12b Through hole 13 Bottomed fitting hole 14a, 14b Bottomed fitting hole 15 Space for inserting guide member 21 Screw 22 Screw hole 23 Screw hole 24 Convex part 25 Concave part 31 Guide member 31a Frame member 31b Bottom member 31c Screw 31d Screw hole

Claims (11)

A temperature data logger with a clock function that measures the temperature and stores it in the internal memory and a reference thermometer connected to a computer installed outside the bus via a measuring instrument are connected to the thermostatic bath via a soaking block. A procedure for providing
A procedure for raising or lowering the temperature of the constant temperature bath and storing the measurement data by the reference thermometer in the storage means of the computer,
Connecting the temperature data logger taken out from the constant temperature bath to a computer and storing the measurement data stored in the internal memory in the storage means of the computer;
A procedure for outputting the result of calibration by matching the time axis of the measurement data of the reference thermometer and the measurement data of the temperature data logger stored in the storage means by the computing means of the computer;
A temperature data logger calibration method characterized by comprising:   The temperature data logger calibration method according to claim 1, further comprising a step of inputting a temperature measurement condition including a measurement interval in advance by connecting to a computer before providing the temperature data logger in a constant temperature bath.   The method of outputting the calibrated result is characterized in that the calculation means extracts a predetermined section in which both measurement data converge within a predetermined variation and outputs an average value of both extracted data. 2. The temperature data logger calibration method according to 2.   The temperature data logger calibration method according to any one of claims 1 to 3, wherein the soaking block covers and stores the entire temperature data logger so that there is substantially no gap.   The temperature data logger is composed of a main body portion storing the internal memory and a sensor portion protruding from the main body portion, and the heat equalization block receives the sensor portion of the temperature data logger stored downward. 5. The sensor block for receiving a sensor portion at the tip of a reference thermometer, and a main body block for holding the body portion of the temperature data logger and holding the body portion of the reference thermometer. The temperature data logger calibration method according to any one of the above items.   It is a soaking block used for the calibration method of any one of Claims 1-4, Comprising: There is almost no clearance gap between the insertion part for inserting the said reference thermometer, and the said whole temperature data logger. A soaking block comprising a storage portion that covers and stores the state.   A sensor block for receiving the sensor portion at the tip of the temperature data logger stored in the downward direction and receiving the sensor portion at the tip of the reference thermometer, the main portion of the temperature data logger, and the main portion of the reference thermometer The soaking block according to claim 6, which is divided into a main body block for holding the water. Along the vertical direction of the main body block, a through hole is provided for inserting the temperature data logger and the reference thermometer,
A bottomed portion into which a sensor portion of the temperature data logger and a sensor portion at the tip of the reference thermometer are respectively inserted at positions corresponding to the through holes in the sensor block fitted to the lower end portion of the main body block. The soaking block according to claim 7, wherein a storage hole is provided.   9. The heat equalizing block according to claim 8, further comprising a rod-shaped block which is inserted into a through hole for inserting the temperature data logger and which closes an excess space above the stored temperature data logger main body.   The soaking block according to claim 9, wherein the rod-shaped block is made of the same material as the main body block. The heat equalizing block according to any one of claims 7 to 10, wherein a heat insulating material is interposed between the sensor block and the main body block to be attached to each other.

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