Gas chromatograph apparatus and measuring tube unit, and method for manufacturing the measuring tube unit.

Abstract

In a gas chromatograph, the accuracy of measuring the sample gas within the sample loop is improved. [Solution] The gas chromatograph apparatus 100 analyzes the components contained in the gas to be analyzed. The gas chromatograph apparatus 100 comprises a measuring tube 30 and a heater block 40. The measuring tube 30 measures the gas. The heater block 40 heats the measuring tube 30 to a predetermined temperature. The measuring tube 30 is in contact with the heater block 40 and is wrapped around the heater block 40.

Description

Technical Field

[0001] The present disclosure relates to a gas chromatograph device and a metering tube unit, and a method for manufacturing the metering tube unit. More specifically, it relates to a technique for improving the metering accuracy of a sample gas in a metering tube.

Background Art

[0002] In a gas chromatograph device, a sample gas before analysis is adjusted to an appropriate amount for analysis by a metering tube (sample loop) heated by a heater block and then analyzed.

[0003] For example, Japanese Patent Application Laid-Open No. 8-304368 (Patent Document 1) discloses a gas chromatograph in which a sample gas is introduced into an analysis unit through a sample loop.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] A sample loop for adjusting a sample gas to an appropriate amount for analysis is generally disposed in a hollow portion within a box in which a heater block is disposed and is not in direct contact with the heater block. Therefore, in a conventional gas chromatograph device, since the sample loop is indirectly heated by the air within the box heated by the heater block, a difference may occur between the actual temperature of the sample gas within the sample loop and the set temperature of the heater block that heats the sample loop. Since the volume of the sample gas within the sample loop changes depending on the temperature, if the temperature of the sample loop differs from the temperature of the heater block for which temperature control is performed, the metering accuracy of the sample gas in the sample loop may decrease.

[0006] This disclosure was made to solve the above-mentioned problems, and its purpose is to improve the metering accuracy of the sample gas in the sample loop of a gas chromatograph. [Means for solving the problem]

[0007] A gas chromatograph apparatus according to a certain aspect of this disclosure analyzes components contained in a gas to be analyzed. The gas chromatograph apparatus comprises a measuring tube and a heater block. The measuring tube measures the gas. The heater block heats the measuring tube to a predetermined temperature. The measuring tube is in contact with the heater block and is wrapped around the heater block.

[0008] A measuring tube unit relating to other aspects of this disclosure is used in a gas chromatograph apparatus for analyzing components contained in a gas to be analyzed. The measuring tube unit comprises a measuring tube and a heater block. The measuring tube measures the gas. The heater block heats the measuring tube to a predetermined temperature. The measuring tube is located in close proximity to the heater block and is wrapped around the heater block.

[0009] Further aspects of this disclosure relate to a manufacturing method for a measuring tube unit used in a gas chromatograph apparatus for analyzing components contained in a gas to be analyzed. The measuring tube unit includes a measuring tube and a heater block. The measuring tube measures the gas. The heater block heats the measuring tube to a predetermined temperature. The heater block includes a cylindrical section. The manufacturing method includes the steps of preparing the heater block, forming the measuring tube into a spiral shape with an inner diameter smaller than the outer diameter of the cylinder section, and unfolding the formed measuring tube and wrapping it tightly around the cylinder section. [Effects of the Invention]

[0010] In the gas chromatograph apparatus of this disclosure, the sample loop can be heated in close proximity to the heater block by wrapping the sample loop around the heater block. Therefore, the difference between the actual temperature of the sample gas in the sample loop and the set temperature of the heater block heating the sample loop can be reduced, thereby improving the accuracy of the measurement of the sample gas in the sample loop. [Brief explanation of the drawing]

[0011] [Figure 1] This figure shows an example of the overall configuration of a gas chromatograph apparatus in an embodiment. [Figure 2] This diagram shows the configuration of the control system in a gas chromatograph. [Figure 3] This is an external view of the sample loop unit in the comparative example. [Figure 4] This is a detailed external view of the sample loop unit in the embodiment. [Figure 5] This is an external view of the sample loop unit in a modified example. [Figure 6] This graph shows the temperature changes of the sample loop and heater in the embodiment. [Figure 7] This is a flowchart illustrating the manufacturing procedure for the sample loop unit of the gas chromatograph apparatus in the embodiment. [Modes for carrying out the invention]

[0012] The embodiments of this disclosure will be described in detail below with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and their descriptions will not be repeated.

[0013] <Configuration of the gas chromatograph apparatus 100> Figure 1 shows an example of the overall configuration of the gas chromatograph apparatus 100 in this embodiment. The gas chromatograph apparatus 100 is a device that separates and analyzes the components contained in the sample gas to be analyzed, component by component.

[0014] The gas chromatograph device 100 includes an autosampler 10, a flow path switching device 20, a sample loop unit 50, a carrier gas cylinder 60, a column 70, a column oven 80, a detection device 90, a control device 110, an input device 120, and a display device 130. Each device constituting the gas chromatograph device 100 is connected by piping. The piping constitutes a flow path.

[0015] The autosampler 10 is controlled by the control device 110 and supplies a sample gas of a desired type and amount. Note that the autosampler 10 may be arranged within the same housing as other components of the gas chromatograph device 100, or may be arranged outside the housing.

[0016] The sample loop unit 50 adjusts the sample gas supplied from the autosampler 10 to an amount suitable for analysis. The sample loop unit 50 includes a sample loop 30 and a heater block 40.

[0017] The sample loop 30 is a pipe through which the sample gas flows, and adjusts the amount of the sample gas inside. Depending on the length and inner diameter of the sample loop 30, the amount of gas introduced into the sample loop 30 is different. Therefore, by changing the sample loop 30 by a user or a field engineer or the like, the amount of the sample gas to be analyzed can be changed to a desired amount.

[0018] The heater block 40 is controlled by the control device 110 and heats the sample loop 30 to a predetermined temperature. The predetermined temperature is, for example, a temperature suitable for analysis or a temperature desired by the user. Since the volume of the sample gas changes depending on the temperature, by controlling the sample gas to a desired temperature by the heater block 40, the sample gas can be appropriately measured. Also, an accurate analysis result can be obtained thereby.

[0019] The carrier gas cylinder 60 is a cylinder for storing carrier gas. The carrier gas is a gas that does not interfere with the analysis results of the sample gas, such as helium or nitrogen, and is used to convey the sample gas to the detection device 90 through the column 70. The carrier gas cylinder 60 is connected to the flow path switching device 20. By switching the flow path switching device 20, the sample gas measured in the sample loop 30 is conveyed to the column 70 using the carrier gas. Note that the carrier gas cylinder 60 may be arranged in the same housing as other components of the gas chromatograph device 100, or may be arranged independently outside the housing.

[0020] In the column 70, a mixed gas of the sample gas supplied from the sample loop 30 and the carrier gas flows, and the components contained in the sample gas are separated by component. That is, the column 70 separates the sample gas by component. Since the time taken to pass through the column 70 varies depending on the component, the sample gas can be separated by component.

[0021] The column oven 80 is controlled by the control device 110 and adjusts the temperature of the column 70 arranged inside to a temperature suitable for analysis. The column oven 80 has a temperature sensor (not shown) inside. The temperature near the column 70 can be measured by the temperature sensor. By doing so, the control device 110 can perform feedback control and control the sample gas inside the column 70 to a desired temperature.

[0022] The detection device 90 is controlled by the control device 110 and sequentially detects various components separated by the column 70. The detection device 90 is, for example, a thermal conductivity detector (TCD: Thermal Conductivity Detector), a flame ionization detector (FID: Flame Ionization Detector), etc. The mixed gas of the sample gas and the carrier gas discharged from the detection device 90 is discharged outside the gas chromatograph device 100.

[0023] The flow path switching device 20 is, for example, composed of a hexagonal valve and has six ports P1 to P6, and switches between two flow path patterns in the gas chromatograph apparatus 100. The flow path switching device 20 is connected to the sample loop 30 and the column 70, and switches the supply and cessation of the sample gas metered in the sample loop 30 to the column 70. The flow path switching device 20 may also be a four-way valve or a combination of other types of valves.

[0024] Port P1 of the flow path switching device 20 is connected to the discharge port of the autosampler 10. Port P2 is connected to one end of the sample loop 30. Port P3 is connected to the discharge port of the carrier gas cylinder 60. Port P4 is connected to the column 70. Port P5 is connected to the other end of the sample loop 30. Port P6 is connected to the outlet leading to the outside of the gas chromatograph apparatus 100.

[0025] The control device 110 controls the autosampler 10, the flow path switching device 20, the heater block 40, the column oven 80, the detection device 90, and the display device 130. The control device 110 may be located in the same housing as the other components of the gas chromatograph apparatus 100, or it may be located outside the housing.

[0026] The input device 120 receives operation input from the user and transmits an operation signal to the control device 110. The input device 120 may be, for example, a keyboard, a touch panel, or a mouse. The input device 120 may be located inside the same housing as the other components of the gas chromatograph apparatus 100, or it may be located outside the housing.

[0027] The display device 130 receives and displays the analysis results of the sample gas from the control device 110. The display device 130 is, for example, a display or a printer. The display device 130 may be located inside the same housing as the other components of the gas chromatograph apparatus 100, or it may be located outside the housing.

[0028] <Switching of the flow path by the flow path switching device 20> The flow path switching device 20 switches between the first flow path pattern and the second flow path pattern. The gas chromatograph apparatus 100 first prepares to analyze the components contained in the sample gas in the first flow path pattern. Then, the gas chromatograph apparatus 100 analyzes the components contained in the sample gas in the second flow path pattern.

[0029] In the first flow path pattern, as shown by the dashed lines in the flow path switching device 20 in Figure 1, ports P1 and P2 of the flow path switching device 20 are connected, ports P3 and P4 are connected, and ports P5 and P6 are connected. Therefore, the sample gas supplied from the autosampler 10 flows in the order of port P1, port P2, sample loop 30, port P5, and port P6, and is discharged outside the gas chromatograph apparatus 100.

[0030] Subsequently, the control device 110 stops the supply of sample gas from the autosampler 10 to the sample loop 30 and closes a valve (not shown) located between the sample loop 30 and port P5 of the flow path switching device 20. This allows impurities to be discharged from the sample loop 30 and the sample loop 30 to be filled with sample gas. The sample gas is then adjusted to an amount suitable for analysis within the sample loop 30.

[0031] Meanwhile, the carrier gas supplied from the carrier gas cylinder 60 flows through port P3, port P4, column 70, and detection device 90 in that order, and is discharged outside the gas chromatograph apparatus 100. In this way, impurities can be discharged from inside column 70 and detection device 90 to the outside, and inside column 70 and detection device 90 can be filled with carrier gas.

[0032] In the second flow path pattern, as shown by the solid lines in Figure 1 of the flow path switching device 20, ports P2 and P3 of the flow path switching device 20 are connected, ports P4 and P5 are connected, and ports P6 and P1 are connected. Therefore, the autosampler 10 is in communication with ports P1 and P6. Consequently, even if a sample gas is supplied from the autosampler 10, it will be discharged to the outside of the gas chromatograph apparatus 100.

[0033] When a valve (not shown) located between the sample loop 30 and port P5 of the flow path switching device 20 is opened, the carrier gas supplied from the carrier gas cylinder 60 flows in the following order: port P3, port P2, sample loop 30, port P5, port P4, column 70, and detection device 90. That is, the carrier gas pushes the sample gas metered in the sample loop 30 into column 70, and then transports each component of the sample gas that has passed through column 70 to the detection device 90. In this way, the gas chromatograph apparatus 100 can analyze the components in the sample gas.

[0034] Figure 2 shows the configuration of the control device 110 in the gas chromatograph apparatus 100. As shown in Figure 2, the control device 110 comprises a storage device 112, a processor 114, and a communication interface 116, all connected to each other via a common communication bus.

[0035] The communication interface 116 receives setting values ​​for various parameters of the gas chromatograph apparatus 100 and analysis results of the sample gas components from the input device 120 and the detection device 90. The communication interface 116 also transmits signals to the autosampler 10, the flow path switching device 20, the heater block 40, the column oven 80, the detection device 90, and the display device 130.

[0036] The storage device 112 stores various programs and data. The storage device 112 includes, for example, memory devices such as ROM (Read Only Memory) and RAM (Random Access Memory), as well as mass storage devices such as HDD (Hard Disk Drive) and SSD (Solid State Drive).

[0037] The processor 114 controls the autosampler 10, flow path switching device 20, heater block 40, column oven 80, detection device 90, and display device 130 of the gas chromatograph apparatus 100 based on various data stored in the storage device 112 and various data acquired from the communication interface 116. The processor 114 is, for example, a computing device such as a CPU (Central Processing Unit) and an MPU (Micro Processing Unit).

[0038] In this embodiment, the "sample loop" corresponds to the "measuring tube" in this disclosure. Also, the "sample loop unit" in this embodiment corresponds to the "measuring tube unit" in this disclosure.

[0039] Figure 3 is an external view of the sample loop unit 59 in a comparative example. A typical sample loop unit 59 includes a flow path switching device 29, a sample loop 39, a heater block 49, and a box 69. The plane of the flow path switching device 29 is in contact with the plane of the heater block 49. The sample loop 39 is in contact with the flow path switching device 29.

[0040] However, as shown in Figure 3, the sample loop 39, which adjusts the sample gas to a suitable amount for analysis, is generally located in the hollow space within the box 69 where the heater block 49 is placed, and does not directly contact the heater block 49. Therefore, in the comparative example gas chromatograph, the sample loop 39 is indirectly heated by the air in the box 69 heated by the heater block 49. As a result, there may be a difference between the actual temperature of the sample gas in the sample loop 39 and the set temperature of the heater block 49 that heats the sample loop 39. In addition, there may be variations in the actual temperature of the sample gas in different parts of the sample loop 39. Since the volume of the sample gas changes with temperature, the accuracy of the sample gas measurement by the sample loop 39 may decrease in the comparative example gas chromatograph.

[0041] Therefore, in the sample loop unit 50 of the embodiment, as shown in Figure 1, the sample loop 30 is directly wrapped around the heater block 40. Figure 4 is a detailed external view of the sample loop unit 50 in the embodiment. As shown in Figure 4, in addition to the sample loop 30 and the heater block 40, the sample loop unit 50 in the embodiment further includes a flow path switching device 20, a support member 52, and a fixing member 54.

[0042] The heater block 40 has a cylinder portion 42 and a flange portion 44. The cylinder portion 42 is a cylindrical metal member with a heater arranged inside. Note that the cylinder portion 42 is not limited to a cylindrical shape, and may have a polygonal or elliptical cross-section. The flange portion 44 is located at one end of the cylinder portion 42 and protrudes outward from the outer circumference of the cylinder portion 42. Multiple through holes are formed in the cylinder portion 42 for fixing the heater block 40. The sample loop 30 is in contact with the heater block 40 and is spirally wrapped around the cylinder portion 42 of the heater block 40.

[0043] As shown in Figure 4, the flow path switching device 20 is positioned in contact with the extended end of the cylinder portion 42 of the heater block 40. The heater block 40 and the flow path switching device 20 are fixed together in close contact by a flat plate-shaped support member 52 and a fixing member 54. More specifically, the flow path switching device 20 is positioned between the support member 52 and the heater block 40, and these devices are fixed together by the fixing member 54 which penetrates the support member 52 and the flange portion 44.

[0044] In this way, by directly winding the sample loop 30 around the cylinder portion 42 of the heater block 40, which is temperature-controlled, the sample loop 30 can be heated at a position close to the heater block 40. Therefore, the difference between the actual temperature of the sample gas in the sample loop and the set temperature of the heater block heating the sample loop can be reduced. In addition, the variation in the actual temperature of the sample gas in each part of the sample loop can be reduced. Thus, the measurement accuracy of the sample gas in the sample loop can be improved.

[0045] In Figure 4, the sample loop 30 was directly wrapped around the heater block 40. However, as shown in the modified example in Figure 5, a highly heat-conductive buffer material 56 may be placed between the sample loop 30 and the heater block 40 so as to be in contact with both the sample loop 30 and the heater block 40. Figure 5 is an external view of the sample loop unit 50A in the modified example.

[0046] As shown in Figure 5, in the modified sample loop unit 50A, a buffer material 56 is arranged to fill the gap between the sample loop 30 and the cylinder portion 42 of the heater block 40. The buffer material 56 is a highly heat-conductive material such as a graphite sheet and an aluminum sheet. Therefore, by arranging the buffer material 56, heat from the heater block 40 can be efficiently transferred to the sample loop 30 via the buffer material 56. Consequently, the time required to reach the desired temperature can be shortened, and the power consumption of the heater can be reduced.

[0047] In this way, by wrapping the sample loop 30 around the cylinder portion 42 in which the heater is built into the heater block 40, the sample loop 30 can be heated at a position close to the heater block 40. Therefore, the difference between the actual temperature of the sample gas in the sample loop and the set temperature of the heater block that heats the sample loop can be reduced. Consequently, the accuracy of the temperature of the sample gas in the sample loop can be improved, and as a result, the accuracy of the measurement of the sample gas in the sample loop can be improved.

[0048] Figure 6 is a graph showing the temperature changes of the sample loop and heater in the embodiment. The horizontal axis represents the time since the start of heating of the heater block. The vertical axis shows the heater temperature HT inside the heater block, the sample loop temperature ST in the embodiment, and the room temperature RT in the room where the gas chromatograph apparatus is located.

[0049] Referring to Figure 6, when the room temperature RT is constant (25°C) regardless of time, once a certain amount of time has passed since the start of heating and the temperature has stabilized, there is almost no difference between the sample loop temperature ST and the heater temperature HT. Therefore, in the sample loop configuration of this embodiment, the difference between the actual temperature of the sample gas in the sample loop and the set temperature of the heater block that heats the sample loop can be reduced. Thus, the measurement accuracy of the sample gas in the sample loop can be improved.

[0050] <Manufacturing method for sample loop units> Figure 7 is a flowchart showing the manufacturing procedure for the sample loop unit 50 of the gas chromatograph apparatus 100 according to the embodiment. First, the user prepares a heater block 40 including a cylindrical section 42 (step S1). Next, the user forms the sample loop 30 into a spiral shape with an inner diameter smaller than the outer diameter of the cylindrical section 42 (step S2). The sample loop 30 is formed into a spiral shape while maintaining a constant diameter. Finally, the user wraps the sample loop 30, which has been formed into a spiral shape with an inner diameter smaller than the outer diameter of the cylinder section 42, around the cylinder section 42 while expanding it in the elastic deformation region (step S3).

[0051] When a sample loop that was originally linear is formed into a spiral shape, elastic force acts on the sample loop to some extent, trying to return it to its original linear shape. Therefore, the inner diameter of the spiral-shaped sample loop tends to be slightly larger than the inner diameter at the time of formation. To address this, the sample loop 30 is formed into a spiral shape with an inner diameter smaller than the outer diameter of the cylindrical part 42, and the sample loop 30 is wrapped tightly around the cylinder part 42 while slightly widening its inner diameter in the elastic deformation region.

[0052] By assembling the sample loop unit using this method, a force acts on the installed sample loop 30 in a direction that reduces its inner diameter. Therefore, the sample loop 30 can be made to fit tightly against the cylinder 42 without using any special components to press the sample loop 30 against the cylinder 42. The larger the contact area between the sample loop 30 and the cylinder 42, the closer the temperature of the sample loop 30 becomes to the temperature of the cylinder 42. Therefore, the difference between the actual temperature of the sample gas in the sample loop and the set temperature of the heater block that heats the sample loop can be reduced, improving the accuracy of the measurement of the sample gas in the sample loop.

[0053] [Aspect] Those skilled in the art will understand that the above-described exemplary embodiments are specific examples of the following embodiments.

[0054] (Article 1) A gas chromatograph apparatus according to one embodiment analyzes the components contained in a gas to be analyzed. The gas chromatograph apparatus comprises a measuring tube and a heater block. The measuring tube measures the gas. The heater block heats the measuring tube to a predetermined temperature. The measuring tube is in contact with the heater block and is wrapped around the heater block.

[0055] According to the gas chromatograph apparatus described in paragraph 1, the sample loop can be heated by bringing it into contact with the heater block. Therefore, the difference between the actual temperature of the sample gas in the sample loop and the set temperature of the heater block that heats the sample loop can be suppressed, and the accuracy of the measurement of the sample gas in the sample loop can be improved.

[0056] (Paragraph 2) In the gas chromatograph apparatus described in Paragraph 1, at least a portion of the measuring tube is in direct contact with the heater block.

[0057] According to the gas chromatograph apparatus described in paragraph 2, the sample loop can be heated by directly contacting the heater block. Therefore, the difference between the actual temperature of the sample gas in the sample loop and the set temperature of the heater block heating the sample loop can be suppressed, and the accuracy of the measurement of the sample gas in the sample loop can be improved.

[0058] (3) The gas chromatograph apparatus described in paragraph 1 further comprises a buffer material positioned between the heater block and the measuring tube so as to be in contact with the heater block and the measuring tube. At least a portion of the measuring tube is indirectly in contact with the heater block.

[0059] According to the gas chromatograph apparatus described in Section 3, by placing a buffer material, heat from the heater block can be efficiently transferred to the sample loop via the buffer material. Therefore, the time required to reach the desired temperature can be shortened, and the power consumption of the heater can be reduced.

[0060] (Section 4) The gas chromatograph apparatus described in any one of Sections 1 to 3 further comprises a column and a flow path switching device. The column separates the gas into its components. The flow path switching device is connected to the metering tube and the column and switches the supply and cessation of the gas metered in the metering tube to the column.

[0061] According to the gas chromatograph apparatus described in paragraph 4, impurities in the piping can be removed, and after filling the sample loop with a desired amount of sample gas, the components of the sample gas can be analyzed.

[0062] (Section 5) In the gas chromatograph apparatus described in Section 4, the flow path switching device is positioned in contact with the heater block.

[0063] According to the gas chromatograph apparatus described in Section 5, the flow path switching device can also be heated in close proximity to the heater block, similar to the sample loop. Therefore, the difference between the actual temperature of the sample gas in the valve and the set temperature of the heater block heating the sample loop can be suppressed, thereby improving the accuracy of the metering of the sample gas in the sample loop.

[0064] (Item 6) In the gas chromatograph apparatus described in any one of items 1 to 5, the heater block includes a cylindrical section. The measuring tube is spirally wound around the cylinder section.

[0065] According to the gas chromatograph apparatus described in Section 6, the sample loop can be heated in contact with the heater block. Therefore, the difference between the actual temperature of the sample gas in the sample loop and the set temperature of the heater block that heats the sample loop can be suppressed, thereby improving the accuracy of the measurement of the sample gas in the sample loop.

[0066] (Section 7) A measuring tube unit according to one embodiment is used in a gas chromatograph apparatus for analyzing components contained in a gas to be analyzed. The measuring tube unit comprises a measuring tube and a heater block. The measuring tube measures the gas. The heater block heats the measuring tube to a predetermined temperature. The measuring tube is in contact with the heater block and is wrapped around the heater block.

[0067] According to the measuring tube unit in Section 7, the sample loop can be heated by bringing it into contact with the heater block. Therefore, the difference between the actual temperature of the sample gas in the sample loop and the set temperature of the heater block that heats the sample loop can be suppressed, and the accuracy of measuring the sample gas in the sample loop can be improved.

[0068] (Section 8) A method for manufacturing a measuring tube unit according to one embodiment relates to a method for manufacturing a measuring tube unit used in a gas chromatograph apparatus for analyzing components contained in a gas to be analyzed. The measuring tube unit includes a measuring tube and a heater block. The measuring tube measures the gas. The heater block heats the measuring tube to a predetermined temperature. The heater block includes a cylindrical part. The manufacturing method includes the steps of preparing the heater block, forming the measuring tube into a spiral shape with an inner diameter smaller than the outer diameter of the cylinder part, and unfolding the formed measuring tube and wrapping it tightly around the cylinder part.

[0069] According to the manufacturing method of the measuring tube unit in Section 8, the sample loop 30 can be brought into close contact with the cylinder portion 42 without using a special member to press the sample loop 30 against the cylinder portion 42, thereby increasing the contact area between the sample loop 30 and the cylinder portion 42. Therefore, the difference between the actual temperature of the sample gas in the sample loop and the set temperature of the heater block that heats the sample loop can be reduced, and the accuracy of measuring the sample gas in the sample loop can be improved.

[0070] The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of the present invention is indicated by the claims rather than by the description of the embodiments above, and all modifications within the meaning and scope equivalent to the claims are intended to be included. [Explanation of Symbols]

[0071] 10 Autosampler, 20 Flow path switching device, 30 Sample loop, 40 Heater block, 42 ​​Cylinder section, 44 Flange section, 50, 50A Sample loop unit, 52 Support member, 54 Fixing member, 56 Cushioning material, 60 Carrier gas cylinder, 70 Column, 80 Column oven, 90 Detection device, 100 Gas chromatograph device, 110 Control device, 112 Storage device, 114 Processor, 116 Communication interface, 120 Input device, 130 Display device, P1, P2, P3, P4, P5, P6 ports.

Claims

1. A gas chromatograph that analyzes the components contained in the gas to be analyzed, A measuring tube for measuring the aforementioned gas, The measuring tube is equipped with a heater block that heats the measuring tube to a predetermined temperature, A gas chromatograph apparatus in which the measuring tube is in contact with and wrapped around the heater block.

2. The gas chromatograph apparatus according to claim 1, wherein at least a portion of the measuring tube is in direct contact with the heater block.

3. The heater block and the measuring tube are further provided with a cushioning material positioned in contact with the heater block and the measuring tube. The gas chromatograph apparatus according to claim 1, wherein at least a portion of the measuring tube is indirectly in contact with the heater block.

4. A column for separating the aforementioned gas into its components, The gas chromatograph apparatus according to any one of claims 1 to 3, further comprising a flow path switching device connected to the metering tube and the column, which switches the supply and cessation of the gas metered in the metering tube to the column.

5. The gas chromatograph apparatus according to claim 4, wherein the flow path switching device is arranged in contact with the heater block.

6. The heater block includes a cylindrical section, The gas chromatograph apparatus according to claim 5, wherein the measuring tube is wound spirally around the cylinder portion.

7. A measuring tube unit used in a gas chromatograph apparatus for analyzing components contained in a gas to be analyzed, The aforementioned measuring tube unit is, A measuring tube for measuring the aforementioned gas, The measuring tube is equipped with a heater block that heats the measuring tube to a predetermined temperature, A measuring tube unit in which the measuring tube is in contact with the heater block and wrapped around the heater block.

8. A method for manufacturing a measuring tube unit used in a gas chromatograph apparatus for analyzing components contained in a gas to be analyzed, The aforementioned measuring tube unit is, A measuring tube for measuring the aforementioned gas, The measuring tube includes a heater block that heats the measuring tube to a predetermined temperature, The heater block includes a cylindrical section, The aforementioned manufacturing method is The steps include preparing the heater block, The steps include forming the measuring tube into a spiral shape with an inner diameter smaller than the outer diameter of the cylinder portion, A method for manufacturing a measuring tube unit, comprising the step of unfolding the molded measuring tube and wrapping it tightly around the cylinder portion.

Images