JP2019128251A - Gas chromatograph - Google Patents

Abstract

To provide a gas chromatograph in which both of a pulsating current of carrier gas and dew condensation can be suppressed.SOLUTION: A gas chromatograph 10 comprises: a booster pump 32 taking in surrounding air of a gas chromatograph 10 as a carrier gas; a pressure tank 33 capable of storing the carrier gas supplied by the booster pump 32 in such a state that the carrier gas supplied by the booster pump 32 has pressure higher than the pressure of the surrounding air of the gas chromatograph 10; a flow rate adjustment part 36 arranged on an upstream position of a capillary column 39 for adjusting flow rate of the carrier gas supplied from the pressure tank 33; check valves 21, 22 which can suppress, during stop of the booster pump 32, inflow of air into the inside of a specific flow channel range from the outside of the specific flow channel range including a flow channel from the pressure tank 33 to a gas sensor 40 out of an air flow channel inside the gas chromatograph 10; and dehumidification agents 31b, 33b,41b arranged in the specific flow channel range and performing dehumidification.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a gas chromatograph which takes in ambient air as a carrier gas by means of a pump.

  As a conventional gas chromatograph, a pump for taking in ambient air as a carrier gas, an injection unit into which a sample is injected, a column for separating components of the sample injected from the injection unit and moved by the carrier gas, and a column Included in the gas sensor that detects the separated components, the flow rate adjusting unit arranged at the upstream position of the column to adjust the flow rate of the carrier gas supplied from the pump, and the air before being supplied to the column There is known a gas chromatograph including a filter that removes at least a part of an organic substance and a dehumidifying unit that dehumidifies air as carrier gas before reaching the column (for example, Patent Documents 1 and 2). reference.).

  The gas chromatographs described in Patent Documents 1 and 2 do not include a high-pressure gas cylinder filled with a gas such as ultra-high purity helium gas or nitrogen to be supplied to the column as a carrier gas. Compared to the conventional gas chromatograph, the size and weight can be reduced, and as a result, the portability is excellent.

Unexamined-Japanese-Patent No. 9-184829 gazette JP, 2010-101684, A

  However, in the gas chromatographs described in Patent Documents 1 and 2, when the pressure of the carrier gas supplied from the pump to the flow rate adjusting unit is low, the pressure difference between the upstream side and the downstream side of the flow rate adjusting unit is small. When the carrier gas on the upstream side of the flow control unit generates a pulsating flow according to the operation of the pump, the pressure difference between the upstream and downstream sides of the flow control unit falls below the pressure difference for normal operation of the flow control unit. If the flow rate adjustment unit does not operate normally and the flow rate adjustment unit does not operate normally, the carrier gas on the upstream side of the flow rate adjustment unit may cause carrier gas downstream of the flow rate adjustment unit due to the influence of the pulsating flow. Also pulsating flow occurs. Since the flow velocity of the carrier gas in the gas sensor fluctuates when a pulsating flow is generated in the carrier gas on the downstream side of the flow rate adjusting unit, the higher the flow velocity of the carrier gas in the gas sensor is, the more the flow velocity of the carrier gas in the gas sensor Because the amount of the component per unit time increases, the higher the concentration of the component in the sample is detected by the gas sensor, and the slower the flow rate of the carrier gas in the gas sensor, the lower the unit of sample component that is allowed to pass through the gas sensor by the carrier gas. The concentration of the components of the sample is detected low by the gas sensor as the amount per hour is reduced. That is, in the gas chromatographs described in Patent Documents 1 and 2, noise is generated in the detection result of the gas sensor due to the pulsating flow generated in the carrier gas. Therefore, in the gas chromatographs described in Patent Documents 1 and 2, it is difficult to increase the sensitivity so that a normal detection result can be obtained even if the amount of the sample injected into the injection unit is small, and the carrier gas In order to suppress the influence of noise generated on the detection result of the gas sensor due to the pulsating flow generated in the sample, it is necessary to increase the amount of sample injected into the injection unit.

  Here, the pulsating flow generated in the carrier gas is such that the gas chromatograph has a tank capable of storing the carrier gas supplied by the pump at a pressure higher than the pressure of the air around the gas chromatograph, and the carrier gas supplied directly by the pump. The flow rate of the carrier gas supplied from the tank, not the flow rate of the gas, can be suppressed by the flow rate adjusting unit.

  However, when the pressure of the carrier gas inside the tank is made higher than the pressure of the air around the gas chromatograph, the water vapor contained in the carrier gas is cooled by adiabatic expansion of the carrier gas when the pressure of the carrier gas decreases. As condensation appears in at least one of the column and the gas sensor, there is a problem that dew condensation causes at least one of aging and characteristic deterioration in the column and the gas sensor in which condensation appears. For example, when condensation occurs in the column, the liquid phase inside the column is deteriorated due to condensation, and the column characteristics deteriorate.

  Then, an object of this invention is to provide the gas chromatograph which can suppress both the pulsating flow of carrier gas, and dew condensation.

  The gas chromatograph according to the present invention detects an injection part into which a sample is injected, a column for separating components of the sample injected from the injection part and transferred by the carrier gas, and the components separated by the column A gas chromatograph comprising a gas sensor, and a pump for taking in air around the gas chromatograph as the carrier gas, and storing the carrier gas supplied by the pump at a pressure higher than the pressure of the air around the gas chromatograph Of the gas chromatograph, the flow control section disposed at a position upstream of the column for adjusting the flow rate of the carrier gas supplied from the tank, and the tank among the flow paths of air inside the gas chromatograph From the outside of the specific range including the flow path from the sensor to the gas sensor, An air inflow suppressing means capable of suppressing the inflow of air to the inside of a predetermined range while the pump is stopped, and a dehumidifying unit for performing dehumidification, wherein the dehumidifying unit is at least one in the specific range. It is characterized in that it is arranged at a place.

  According to this configuration, the gas chromatograph of the present invention is not the flow rate of the carrier gas directly supplied by the pump, but the carrier gas supplied from a tank capable of storing the carrier gas at a pressure higher than the pressure of air around the gas chromatograph. The flow rate of the carrier gas is adjusted by the flow rate adjusting unit, so that it is possible to suppress the pulsating flow of the carrier gas downstream of the flow rate adjusting unit. Further, the gas chromatograph of the present invention performs dehumidification by means of a dehumidifying unit disposed in a specific range including the flow path from the tank to the gas sensor among the flow paths of the internal air, and from the outside of this range Since the inflow of air to the inside of this range is suppressed by the air inflow suppressing means while the pump is stopped, dew condensation inside this range can be suppressed even when the pump is stopped.

  In the gas chromatograph of the present invention, at least one of the dehumidifying parts in the specific range includes a first dehumidifying agent and a second dehumidifying agent, and the first dehumidifying agent is the second dehumidifying agent. The dehumidifying speed is higher than that of the first dehumidifying agent, and the second dehumidifying agent may have a larger amount of dehumidifying than the first dehumidifying agent.

  With this configuration, the gas chromatograph according to the present invention dehumidifies the first dehumidifying agent with the second dehumidifying agent having a large amount of dehumidifying after dehumidifying at high speed with the first dehumidifying agent having a high dehumidifying speed. Therefore, high-speed dehumidification can be compatible with long-term dehumidification.

  The gas chromatograph of the present invention is provided with a pre-filter for removing at least a part of volatile organic compounds contained in air before being supplied to the injection unit, outside the tank, within the specific range, The pre-filter may include activated carbon that removes at least a part of the volatile organic compound contained in the air and at least one of the dehumidifying units.

  With this configuration, the gas chromatograph according to the present invention dehumidifies the inside of the front filter by the dehumidifying unit, so that a specific range including the flow path from the tank to the gas sensor among the air flow paths inside the gas chromatograph Condensation in the interior of the filter can be suppressed, and the ability of the front filter to remove volatile organic compounds by activated carbon can be prevented from being reduced by moisture inside the front filter.

  The gas chromatograph of the present invention comprises a post filter for removing at least a part of volatile organic compounds contained in the air after the component is detected by the gas sensor, and the post filter is provided in the specific range. The activated carbon that removes at least a part of the volatile organic compound contained in the air and at least one of the dehumidifying portions may be provided inside.

  With this configuration, the gas chromatograph of the present invention dehumidifies the inside of the rear filter by the dehumidifying unit, so that a specific range including the flow path from the tank to the gas sensor among the air flow paths inside the gas chromatograph Condensation in the interior of the filter can be suppressed, and the ability of the rear filter to remove volatile organic compounds by activated carbon can be prevented from being reduced by moisture in the interior of the rear filter.

  In the gas chromatograph of the present invention, at least one of the dehumidifying parts may be disposed inside the tank.

  When the pressure is high, condensation is likely to occur in the gas due to cooling by adiabatic expansion. In the gas chromatograph of the present invention, when the dehumidifying part is arranged inside the tank capable of storing the carrier gas in a state higher than the pressure of the air around the gas chromatograph, the dehumidifying part arranged inside the tank Dehumidification can be performed effectively.

  The gas chromatograph of the present invention may comprise temperature control means for controlling the temperature of at least one of the column and the gas sensor to be higher than the temperature of the surrounding air.

  With this configuration, the gas chromatograph of the present invention controls the temperature of at least one of the column and the gas sensor to be higher than the temperature of the air around the gas chromatograph, so the temperature of the air around the gas chromatograph of the column and gas sensor. Condensation can be suppressed at a portion where the temperature is higher, and as a result, it is possible to suppress the occurrence of aging and characteristic deterioration of the column and the gas sensor whose temperature is higher than the temperature of the air around the gas chromatograph.

  In the gas chromatograph of the present invention, the temperature control means may control the temperature inside the specific range to be higher than the temperature of the surrounding air.

  With this configuration, the gas chromatograph according to the present invention can set the internal temperature of a specific range including the flow path from the tank to the gas sensor among the air flow paths inside the gas chromatograph higher than the temperature of the air around the gas chromatograph Therefore, dew condensation in this range can be suppressed.

  The gas chromatograph according to the present invention detects an injection part into which a sample is injected, a column for separating components of the sample injected from the injection part and transferred by the carrier gas, and the components separated by the column A gas chromatograph comprising a gas sensor, and a pump for taking in air around the gas chromatograph as the carrier gas, and storing the carrier gas supplied by the pump at a pressure higher than the pressure of the air around the gas chromatograph A possible tank, a flow rate adjusting unit arranged at a position upstream of the column to adjust the flow rate of the carrier gas supplied from the tank, and a dehumidifying unit arranged inside the tank for dehumidifying And the like.

  With this configuration, the gas chromatograph of the present invention is not a carrier gas flow rate directly supplied by a pump, but a carrier gas supplied from a tank capable of storing the carrier gas in a higher pressure than the pressure of the air around the gas chromatograph. The flow rate of the carrier gas is adjusted by the flow rate adjusting unit, so that it is possible to suppress the pulsating flow of the carrier gas downstream of the flow rate adjusting unit. When the pressure is high, condensation is likely to occur in the gas due to cooling by adiabatic expansion. In the gas chromatograph of the present invention, since the dehumidifying part is arranged inside the tank capable of storing the carrier gas in a state higher than the pressure of the air around the gas chromatograph, the dehumidifying part arranged inside the tank Dehumidification can be performed effectively.

  The gas chromatograph of the present invention may include activated carbon that is disposed inside the tank and removes at least a part of a volatile organic compound contained in the carrier gas.

  With this configuration, the gas chromatograph according to the present invention dehumidifies the inside of the tank by the dehumidifying unit, so the ability to remove volatile organic compounds by the activated carbon disposed inside the tank is reduced by the water inside the tank Can be suppressed.

  The gas chromatograph according to the present invention detects an injection part into which a sample is injected, a column for separating components of the sample injected from the injection part and transferred by the carrier gas, and the components separated by the column A gas chromatograph comprising a gas sensor, and a pump for taking in air around the gas chromatograph as the carrier gas, and storing the carrier gas supplied by the pump at a pressure higher than the pressure of the air around the gas chromatograph A possible tank, a flow rate adjusting unit arranged upstream of the column to adjust the flow rate of the carrier gas supplied from the tank, and at least one temperature of the column and the gas sensor And temperature control means for controlling the temperature of the air above the temperature of the air And features.

  With this configuration, the gas chromatograph of the present invention is not a carrier gas flow rate directly supplied by a pump, but a carrier gas supplied from a tank capable of storing the carrier gas in a higher pressure than the pressure of the air around the gas chromatograph. The flow rate of the carrier gas is adjusted by the flow rate adjusting unit, so that it is possible to suppress the pulsating flow of the carrier gas downstream of the flow rate adjusting unit. In addition, since the gas chromatograph of the present invention controls at least one temperature of the column and the gas sensor higher than the temperature of the air around the gas chromatograph, the temperature of the column and the gas sensor is higher than the temperature of the air around the gas chromatograph. The dew condensation can be suppressed at the location where the temperature is high, and as a result, it is possible to suppress the occurrence of the secular change and the characteristic deterioration of the column and the gas sensor whose temperature is higher than the temperature of the air around the gas chromatograph.

  In the gas chromatograph of the present invention, the temperature control means may control the temperature of the flow path of the carrier gas from the tank to the gas sensor higher than the temperature of the surrounding air.

  With this configuration, the gas chromatograph of the present invention makes the temperature of the flow path of the carrier gas from the tank to the gas sensor higher than the temperature of the air around the gas chromatograph, so that the water vapor contained in the carrier gas is the carrier gas. Condensation in the flow path from the tank to the gas sensor, which tends to appear as condensation due to cooling by adiabatic expansion, can be suppressed.

  In the gas chromatograph of the present invention, the temperature control means may control the temperature of the flow path of air inside the gas chromatograph higher than the temperature of the surrounding air.

  With this configuration, the gas chromatograph of the present invention makes the temperature of the air flow path inside the gas chromatograph higher than the temperature of the air around the gas chromatograph, thereby suppressing condensation in the air flow path inside the gas chromatograph. Can.

  The gas chromatograph of the present invention comprises pressure control means for controlling the pressure of the carrier gas inside the tank to be higher than the pressure of the surrounding air and lower than a specific pressure, and the specific pressure is the pressure of the surrounding air. The pressure may be the pressure when the dew point of the air is the temperature of the surrounding air and the dew point of the air is the temperature of the carrier gas inside the tank.

  With this configuration, the gas chromatograph of the present invention is more sensitive than the pressure when the dew point of the air pressure around the gas chromatograph is the temperature of the air around the gas chromatograph and the air dew point is the temperature of the carrier gas inside the tank. Since the pressure of the carrier gas inside the tank is lowered, the condensation can be suppressed even if the pressure and temperature of the carrier gas inside the tank become equal to the pressure and temperature of the air surrounding the gas chromatograph, respectively. Can.

  The gas chromatograph according to the present invention detects an injection part into which a sample is injected, a column for separating components of the sample injected from the injection part and transferred by the carrier gas, and the components separated by the column A gas chromatograph comprising a gas sensor, and a pump for taking in air around the gas chromatograph as the carrier gas, and storing the carrier gas supplied by the pump at a pressure higher than the pressure of the air around the gas chromatograph The flow rate of the carrier gas supplied from the tank, the flow rate adjusting unit disposed at the position upstream of the column, and the temperature of the inside of the tank from the temperature of the surrounding air Temperature control means for high control, and pressure of the carrier gas inside the tank And pressure control means for controlling the pressure higher than the pressure of the ambient air to a pressure lower than a specific pressure, the specific pressure being a dew point of air whose dew point at the pressure of the ambient air is the temperature of the ambient air It is characterized in that the pressure is the temperature of the carrier gas inside the tank.

  With this configuration, the gas chromatograph of the present invention is not a carrier gas flow rate directly supplied by a pump, but a carrier gas supplied from a tank capable of storing the carrier gas in a higher pressure than the pressure of the air around the gas chromatograph. The flow rate of the carrier gas is adjusted by the flow rate adjusting unit, so that it is possible to suppress the pulsating flow of the carrier gas downstream of the flow rate adjusting unit. In addition, the gas chromatograph of the present invention has a tank whose pressure dew point is the temperature of the air around the gas chromatograph, the dew point of which is the temperature of the air around the gas chromatograph, and the pressure when the air dew point is the temperature of the carrier gas inside the tank. Since the pressure of the carrier gas inside the tank is lowered, condensation can be suppressed even if the pressure and temperature of the carrier gas inside the tank become the same as the pressure and temperature of the air surrounding the gas chromatograph, respectively. .

  The gas chromatograph of the present invention may include a pressure regulator disposed at a position downstream of the tank and upstream of the flow rate adjusting unit.

  With this configuration, the gas chromatograph according to the present invention supplies the carrier gas whose pressure is stabilized by the pressure regulator to the flow rate adjustment unit even if a pulsating flow is generated in the carrier gas upstream of the pressure regulator according to the operation of the pump. As a result, the flow rate adjustment unit can be operated normally. Therefore, in the gas chromatograph of the present invention, the flow rate of the carrier gas is properly adjusted by the flow rate adjusting unit that is normally operated, and as a result, it is possible to suppress the pulsating flow of the carrier gas downstream of the flow rate adjusting unit.

  The gas chromatograph of the present invention can suppress both the pulsating flow of the carrier gas and the dew condensation.

It is a block diagram of the gas chromatograph which concerns on one embodiment of this invention. It is a block diagram of the gas chromatograph shown in FIG. It is a flowchart of operation | movement of the gas chromatograph shown in FIG. 1 in the case of controlling temperature. It is a saturated water vapor table | surface which shows the amount of saturated water vapor | steam for every temperature of the air around the gas chromatograph shown in FIG. It is a flowchart of operation | movement of the gas chromatograph shown in FIG. 1 in the case of controlling pressure. It is a figure which shows an example of the fluctuation | variation of the pressure inside the pressure tank shown in FIG. 1 in measurement. It is a pressure dew point-atmospheric pressure dew point conversion table for converting the dew point in arbitrary pressure of the air around the gas chromatograph shown in FIG. 1, and the dew point in atmospheric pressure. It is a flowchart of operation | movement of the gas chromatograph shown in FIG. 1 in the case of controlling a flow volume.

  Hereinafter, an embodiment of the present invention will be described using the drawings.

  In the present specification and drawings, when the pressure is represented by a specific numerical value, it is represented by a gauge pressure.

  First, the configuration of the gas chromatograph according to the present embodiment will be described.

  FIG. 1 is a block diagram of a gas chromatograph 10 according to the present embodiment.

  As shown in FIG. 1, the gas chromatograph 10 is from outside the specific range (hereinafter referred to as “specific flow range”) of the air flow paths inside the gas chromatograph 10 to the inside of the specific flow range. A non-return valve 21 and a non-return valve 22 are provided as means for suppressing air inflow. The air inside the gas chromatograph 10 flows from the check valve 21 side to the check valve 22 side. The check valve 21 prohibits the flow of gas from the inside of the specific flow path range, that is, the downstream side, to the outside of the specific flow path range, that is, the upstream side. Permits gas flow from upstream to downstream only if it is higher than a certain pressure compared to the pressure. The check valve 22 prohibits the flow of gas from the outer side of the specific flow path range, that is, from the downstream side to the inner side of the specific flow path range, that is, the upstream side. Permits gas flow from upstream to downstream only if it is higher than a certain pressure compared to the pressure.

  The gas chromatograph 10 includes a VOC filter 31 that is disposed at a position downstream of the check valve 21 and serves as a pre-filter for removing at least a part of volatile organic compounds (VOC) contained in the air. There is. The air introduced into the gas chromatograph 10 from the outside of the gas chromatograph 10 via the check valve 21 usually contains a volatile organic compound. The VOC filter 31 detects that a volatile organic compound originally contained in the air introduced into the gas chromatograph 10 from the outside of the gas chromatograph 10 through the check valve 21 is detected by a gas sensor 40 described later. It is a filter to suppress.

  The VOC filter 31 is internally provided with an activated carbon 31a for removing at least a part of volatile organic compounds contained in the air, and a dehumidifying agent 31b as a dehumidifying part for dehumidifying. The dehumidifying agent 31 b includes a first dehumidifying agent and a second dehumidifying agent. The first dehumidifying agent has a faster dehumidifying speed as compared to the second dehumidifying agent, and the second dehumidifying agent has a larger amount of dehumidifying than the first dehumidifying agent. For example, the first dehumidifying agent is silica gel and the second dehumidifying agent is zeolite.

  The gas chromatograph 10 is a gas chromatograph that uses a pressure pump 32 as a pump for taking in air around the gas chromatograph 10 as a carrier gas via a check valve 21 and a VOC filter 31, and a carrier gas supplied by the pressure pump 32. The pressure tank 33 is a tank that can be stored in a higher pressure than the pressure of the surrounding air, and a pressure sensor 34 that detects the pressure inside the pressure tank 33.

  The pressure tank 33 is internally provided with an activated carbon 33a for removing at least a part of the volatile organic compound contained in the carrier gas, and a dehumidifying agent 33b as a dehumidifying unit for dehumidifying. The activated carbon 33a is a volatile organic compound contained in the air passed through the VOC filter 31, that is, a volatile organic compound which can not be removed by the VOC filter 31 is detected by the gas sensor 40 described later. It is activated carbon for suppressing. The dehumidifying agent 33 b includes a first dehumidifying agent and a second dehumidifying agent. The first dehumidifying agent has a faster dehumidifying speed as compared to the second dehumidifying agent, and the second dehumidifying agent has a larger amount of dehumidifying than the first dehumidifying agent. For example, the first dehumidifying agent is silica gel and the second dehumidifying agent is zeolite.

  The gas chromatograph 10 includes a pressure regulator 35 disposed at a position downstream of the pressure tank 33 to adjust the pressure of the carrier gas supplied from the pressure tank 33, and the flow rate of the carrier gas supplied from the pressure tank 33. In order to adjust, a flow rate adjusting unit 36 disposed at a position downstream of the pressure regulator 35 and a flow rate sensor 37 for detecting the flow rate adjusted by the flow rate adjusting unit 36 are provided. The pressure regulator 35 is a valve for setting the pressure of the carrier gas downstream of the pressure regulator 35 to a set pressure. The pressure regulator 35 sets the pressure of the carrier gas on the downstream side of the pressure regulator 35, that is, the pressure of the carrier gas supplied on the upstream side of the flow rate adjusting unit 36 to a specific pressure. And the pressure difference on the downstream side is prevented from falling below the pressure difference for normal operation of the flow rate adjustment unit 36. The flow rate adjustment unit 36 is a valve that sets the flow rate of the carrier gas on the downstream side of the flow rate adjustment unit 36 to the set flow rate.

  The gas chromatograph 10 is disposed at a position downstream of the flow rate adjustment unit 36, and an injection unit 38 into which a sample gas as a sample is injected by the syringe 90, and a sample injected from the injection unit 38 and moved by the carrier gas. A capillary column 39 as a column for separating the gas components and a gas sensor 40 for detecting the components separated by the capillary column 39 are provided.

  The gas chromatograph 10 is disposed upstream of the check valve 22 and removes at least a part of volatile organic compounds contained in the air after components are detected by the gas sensor 40. It has 41. The sample gas injected from the injection unit 38 may be, for example, a harmful substance that adversely affects the human body. The VOC filter 41 is a filter for suppressing the sample gas injected from the injection unit 38 from being discharged to the outside of the gas chromatograph 10 through the check valve 22.

  The VOC filter 41 includes an activated carbon 41a that removes at least a part of a volatile organic compound contained in air, and a dehumidifying agent 41b as a dehumidifying unit that performs dehumidification. The dehumidifying agent 41 b includes a first dehumidifying agent and a second dehumidifying agent. The first dehumidifying agent has a faster dehumidifying speed as compared to the second dehumidifying agent, and the second dehumidifying agent has a larger amount of dehumidifying than the first dehumidifying agent. For example, the first dehumidifying agent is silica gel and the second dehumidifying agent is zeolite.

  The gas chromatograph 10 includes a first filter heater 51 as a heater for heating the VOC filter 31, a pressure tank heater 52 as a heater for heating the pressure tank 33, and a heater for heating the injection unit 38. The injection unit heater 53, the column heater 54 as a heater for heating the capillary column 39, the gas sensor heater 55 as a heater for heating the gas sensor 40, and the heater for heating the VOC filter 41 A second filter heater 56 is provided.

  FIG. 2 is a block diagram of the gas chromatograph 10.

  As shown in FIG. 2, the gas chromatograph 10 includes a temperature sensor 61 that detects a temperature inside a housing (not shown) of the gas chromatograph 10, a ventilation fan 62 that ventilates the inside of the housing of the gas chromatograph 10, A flow rate setting actuator 63 that changes the flow rate set in the flow rate adjusting unit 36, an operation unit 64 that is an input device such as buttons for inputting various operations, and an LCD (Liquid Crystal Display) that displays various information. And a communication device that communicates with an external device directly via a network such as a LAN (Local Area Network) or the Internet, or without a network by wire or wirelessly. Communication unit 66 and stores various information Semiconductor memory, and includes an HDD (Hard Disk Drive) storage unit 67 is a nonvolatile storage device such as, a control unit 68 for controlling the entire gas chromatograph 10.

  The control unit 68 includes, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory) storing programs and various data, and a RAM (Random Access Memory) used as a work area of the CPU. There is. The CPU executes a program stored in the ROM or the storage unit 67.

  The control unit 68 executes a program stored in the ROM or the storage unit 67 to control the temperature of the gas chromatograph 10 by temperature control means 68 a and the pressure of the carrier gas inside the pressure tank 33. A control means 68 b and a flow control means 68 c for controlling the flow rate of the carrier gas adjusted by the flow rate adjustment unit 36 are realized.

  Next, the operation of the gas chromatograph 10 will be described.

  First, the operation of the gas chromatograph 10 when receiving measurement conditions before the start of measurement by the gas chromatograph 10 will be described.

  The user can specify measurement conditions such as temperature and flow rate for each elapsed time in the measurement via the operation unit 64 before the measurement by the gas chromatograph 10 is started. The control unit 68 stores the designated measurement condition in the storage unit 67 and performs measurement according to the measurement condition stored in the storage unit 67. Here, the user can shorten the measurement time by the gas chromatograph 10 or increase the types of gases detectable by the gas chromatograph 10 by designating the measurement conditions related to the temperature. The user can specify, for example, a temperature between 50 ° C. and 300 ° C. For example, the component A detected by the gas sensor 40 after 3 minutes from the start of measurement when the temperature is not controlled, and the component B detected by the gas sensor 40 after 120 minutes from the start of measurement when the temperature is not controlled, When the sample gas contains a component C which is not adsorbed by the capillary column 39 but is not detected by the gas sensor 40 when the temperature is not controlled, the injection unit 38, the capillary column 39 and the capillary column 39 continue until 10 minutes have elapsed. By setting the temperature of the gas sensor 40 to 50 ° C., the component A is reliably detected by the gas sensor 40, and after 10 minutes have elapsed from the start of measurement, injection portion 38 is continued until 40 minutes have elapsed from the start of measurement. By setting the temperature of capillary column 39 and gas sensor 40 to 200 The component B is detected by the gas sensor 40 until 40 minutes have elapsed from the beginning, and after 40 minutes have elapsed from the start of measurement, the temperature of the injection unit 38, capillary column 39 and gas sensor 40 is set to 300 ° C. The component C can be released from the adsorption by the capillary column 39 and detected by the gas sensor 40. The user can shorten the measurement time by the gas chromatograph 10 by specifying the measurement condition regarding the flow rate. The user can specify, for example, a flow rate between 1 ml / min and 50 ml / min.

  Next, the operation of the gas chromatograph 10 in the case of controlling the temperature will be described.

  FIG. 3 is a flowchart of the operation of the gas chromatograph 10 when controlling the temperature.

  The temperature control means 68a executes the operation shown in FIG. 3 every second.

  As shown in FIG. 3, the temperature control means 68a determines whether measurement is in progress (S101).

  If it is determined in S101 that the temperature control means 68a is under measurement, the temperature control means 68a controls the temperatures of the injector heater 53, the column heater 54 and the gas sensor heater 55 to the temperatures specified in the measurement conditions of this measurement (S102). ).

  The temperature control means 68a controls the temperature of the injector heater 53, the column heater 54 and the gas sensor heater 55 to 40 ° C. (S103), if it is determined in S101 that the measurement is not under way, ie, the measurement is on standby.

  The temperature control means 68a controls the temperature of the first filter heater 51, the pressure tank heater 52, and the second filter heater 56 to 40 ° C. after the processing of S102 or S103 (S104).

  Next, the temperature control unit 68a determines whether the temperature inside the housing of the gas chromatograph 10 is 40 ° C. or more based on the detection value by the temperature sensor 61 (S105).

  If the temperature control means 68a determines in S105 that the temperature inside the casing of the gas chromatograph 10 is 40 ° C. or higher, the ventilation fan 62 is activated (S106), and the operation shown in FIG. 3 is ended.

  If it is judged at S105 that the temperature inside the casing of the gas chromatograph 10 is not 40 ° C. or more, the temperature control means 68a deactivates the ventilation fan 62 (S107) and ends the operation shown in FIG.

  When the temperature of each sensor or control unit 68 changes by several degrees, a temperature drift occurs in which the baseline of the signal of each sensor fluctuates. Therefore, the processing of S105 to S107 is provided to suppress the occurrence of temperature drift by controlling the temperature of each sensor, such as the flow rate sensor 37 and the gas sensor 40, and the temperature of the control unit 68. By the process of S105 to S107, the temperature inside the housing of the gas chromatograph 10 is controlled, for example, in the range of 40 ° C. ± 2 ° C., that is, in the range of 38 ° C. to 42 ° C.

  The operation shown in FIG. 3 includes the process of S104. However, if the temperature in the specific flow path range is 40 ° C. or higher due to the process of S102, the process of S104 after the process of S102 may be omitted. Similarly, if the temperature in the specific flow path range is 40 ° C. or higher due to the process of S103, the process of S104 after the process of S103 may be omitted. In the gas chromatograph 10, the temperature in the specific flow path range is 40 ° C. or higher by any of the processes of S102 and S103, and the process of S104 after any of the processes of S102 and S103 is also omitted. The first filter heater 51, the pressure tank heater 52 and the second filter heater 56 may not be provided.

If it is assumed that the gas chromatograph 10 is installed in a general room, the maximum temperature in the general room is considered to be 30 ° C. or lower, so the temperature of the air around the gas chromatograph 10 is 30 ° C. or lower. It is believed that there is. FIG. 4 is a saturated water vapor table showing the amount of saturated water vapor for each temperature. When the temperature of the air around the gas chromatograph 10 is 30 ° C. and the humidity of the air around the gas chromatograph 10 is 100%, the amount of water vapor contained in the air around the gas chromatograph 10 is as shown in FIG. As shown, it is 30.3 g / m ³ . Therefore, when the temperature of the air is increased to 40 ° C., the saturated water vapor amount at 40 ° C. is 51.1 g / m ³ as shown in FIG. 4, so the humidity of the air is about 60% (= (30. 3 / 51.1) × 100) and the occurrence of condensation is suppressed. Therefore, in the operation shown in FIG. 3, the gas chromatograph 10 controls the temperature inside the specific flow path range to 40 ° C. or higher, which is higher than 30 ° C. or lower, which is the temperature of the air around the gas chromatograph 10. The temperature inside the specific flow channel range may be higher than the temperature of the air around the gas chromatograph 10, and may not be 40 ° C. or more.

  Next, the operation of the gas chromatograph 10 in the case of controlling the pressure will be described.

  FIG. 5 is a flowchart of the operation of the gas chromatograph 10 when controlling the pressure.

  The pressure control means 68b performs the operation shown in FIG. 5 every second.

  As shown in FIG. 5, the pressure control means 68b determines whether measurement is in progress (S121).

  When determining in S121 that the pressure is being measured, the pressure control means 68b determines whether or not the pressure inside the pressure tank 33 is 50 kPa or less based on the detection value by the pressure sensor 34 (S122).

  If the pressure control means 68b determines in S122 that the pressure inside the pressure tank 33 is 50 kPa or less, the pressure control means 68b activates the pressurizing pump 32 (S123) and ends the operation shown in FIG.

  When the pressure control means 68b determines in S122 that the pressure in the pressure tank 33 is not 50 kPa or less, it determines whether the pressure in the pressure tank 33 is 55 kPa or more based on the detection value by the pressure sensor 34. (S124).

  The pressure control means 68b determines that the pressure pump 32 is not operating if it is determined in S121 that it is not in measurement, that is, in the measurement standby state, or in S124 that the pressure inside the pressure tank 33 is 55 kPa or more. In the state (S125), the operation shown in FIG. 5 is ended.

  When the pressure control means 68b determines that the pressure inside the pressure tank 33 is not 55 kPa or more in S124, it ends the operation shown in FIG.

  FIG. 6 is a diagram showing an example of pressure fluctuation inside the pressure tank 33 during measurement.

  As shown in FIG. 6, the pressure inside the pressure tank 33 during measurement changes between 50 kPa and 55 kPa by the operation shown in FIG.

  FIG. 7 is a pressure dew point-atmospheric pressure dew point conversion table for converting the dew point at an arbitrary pressure and the dew point at atmospheric pressure.

  As shown in FIG. 7, the dew point at 30 ° C. at atmospheric pressure is converted to a dew point of 40 ° C. at a pressure A of 0.06 MPa, ie, greater than 60 kPa, and less than 0.1 MPa, ie, 100 kPa. Therefore, when the temperature of the air around the gas chromatograph 10 is 30 ° C. and the temperature inside the pressure tank 33 is 40 ° C., when the pressure inside the pressure tank 33 is 60 kPa, the pressure of the carrier gas is If the pressure of air surrounding the gas chromatograph 10 downstream of the pressure tank 33, that is, the atmospheric pressure, is reduced to the carrier gas downstream of the pressure tank 33, as shown in FIG. Cooling by adiabatic expansion reduces the temperature of the carrier gas to 32 ° C. However, even if the temperature is lowered to 32 ° C., the temperature of the air at the time when the gas chromatograph 10 is taken into the specific flow path range from the periphery of the gas chromatograph 10, that is, the temperature of the air around the gas chromatograph 10 is 30 ° C. As it is higher, the water vapor contained in the carrier gas does not appear as condensation due to the cooling by the adiabatic expansion of the carrier gas. Actually, since the carrier gas is heated by the operation shown in FIG. 3 also downstream of the pressure tank 33, it is further suppressed that the water vapor contained in the carrier gas appears as condensation due to cooling due to the adiabatic expansion of the carrier gas. Be From the above, the gas chromatograph 10 controls the pressure inside the pressure tank 33 during measurement in the operation shown in FIG. 5 within 60 kPa or less, specifically between 50 kPa and 55 kPa. The pressure inside the pressure tank 33 during the measurement may be equal to or lower than the pressure A when the temperature of the air around the gas chromatograph 10 is 30 ° C. and the temperature inside the pressure tank 33 is 40 ° C. It does not have to be between 50 kPa and 55 kPa. For example, the pressure inside the pressure tank 33 during measurement may be the lowest pressure at which the flow rate adjustment unit 36 can operate normally.

  Next, the operation of the gas chromatograph 10 in the case of controlling the flow rate will be described.

  FIG. 8 is a flowchart of the operation of the gas chromatograph 10 in the case of controlling the flow rate.

  The flow rate control means 68c performs the operation shown in FIG. 8 every one second.

  As shown in FIG. 8, the flow control unit 68c determines whether or not measurement is in progress (S141).

  If the flow rate control means 68c determines in S141 that measurement is in progress, the flow rate of the carrier gas adjusted by the flow rate adjustment unit 36 is controlled to the flow rate specified in the measurement conditions of the current measurement (S142). The operation shown in FIG. Here, the flow rate control unit 68c determines the flow rate adjusted by the flow rate adjustment unit 36 based on the detection value by the flow rate sensor 37, and the flow rate adjusted by the flow rate adjustment unit 36 is designated in the measurement conditions of the current measurement. The flow rate setting actuator 63 is controlled so that the flow rate is reached.

  If the flow rate control unit 68c determines that the measurement is not being performed, that is, the measurement is in standby in S141, the flow rate control unit 68c controls the flow rate of the carrier gas adjusted by the flow rate adjustment unit 36 to 0 ml / min (S143), as shown in FIG. End the operation shown. Here, the flow rate control unit 68c determines the flow rate adjusted by the flow rate adjustment unit 36 based on the detection value by the flow rate sensor 37, and sets the flow rate so that the flow rate adjusted by the flow rate adjustment unit 36 becomes 0 ml / min. The actuator 63 is controlled.

  Next, the condition of the gas in the gas chromatograph 10 when the gas chromatograph 10 is in measurement will be described.

  When the gas chromatograph 10 is measuring, the temperature of the gas in the specific flow path range of the gas chromatograph 10 is controlled to 40 ° C. or higher, which is higher than the temperature of the air around the gas chromatograph 10 by the operation shown in FIG. Ru. In particular, the temperature of the gas in the injection unit 38, the capillary column 39 and the gas sensor 40 is controlled to the temperature specified in the measurement conditions of the present measurement by the processing of S102.

  Further, when the gas chromatograph 10 is under measurement, the pressure of the gas inside the pressure tank 33 is controlled between 50 kPa and 55 kPa by the operation shown in FIG. 5, and the carrier gas adjusted by the flow rate adjusting unit 36 The flow rate is controlled to the flow rate specified in the measurement conditions of the current measurement by the operation shown in FIG. Accordingly, the pressure of the gas inside the specific flow path range of the gas chromatograph 10 is, for example, about the same as the atmospheric pressure in the VOC filter 31 immediately after being introduced from the periphery of the gas chromatograph 10, that is, about 0 kPa. After reaching a pressure between 50 kPa and 55 kPa in the pressure tank 33, the pressure loss from the pressure tank 33 to the injection part 38 results in about 30 kPa in the injection part 38, and due to the pressure loss from the injection part 38 to the gas sensor 40. The pressure is about 5 kPa in the gas sensor 40, and is about 0 kPa in the VOC filter 41 due to the pressure drop from the gas sensor 40 to the VOC filter 41.

  Next, the condition of the gas in the gas chromatograph 10 when the gas chromatograph 10 is waiting for measurement will be described.

  When the gas chromatograph 10 is waiting for measurement, the temperature of the gas in the specific flow path range of the gas chromatograph 10 is controlled to 40 ° C. or higher, which is higher than the temperature of the air around the gas chromatograph 10 by the operation shown in FIG. Be done.

  Further, when the gas chromatograph 10 is waiting for measurement, the pressure of the gas inside the pressure tank 33 is not increased by the operation shown in FIG. Since the operation shown in 8 is controlled to 0 ml / min, the pressure of the gas inside the specific flow path range of the gas chromatograph 10 becomes approximately equal to the atmospheric pressure.

  As described above, the gas chromatograph 10 does not include a high-pressure gas cylinder filled with a gas such as ultra-high purity helium gas or nitrogen to be supplied to the column as a carrier gas. Compared with existing gas chromatographs, the size and weight can be reduced, and as a result, the portability is excellent.

  The gas chromatograph 10 is not the flow rate of the carrier gas directly supplied by the pressure pump 32 but the carrier gas supplied from the pressure tank 33 that can store the carrier gas in a state higher than the pressure of the air around the gas chromatograph 10. The flow rate of the carrier gas is adjusted by the flow rate adjusting unit 36, so that the pulsating flow of the carrier gas downstream of the flow rate adjusting unit 36 can be suppressed.

  The gas chromatograph 10 dehumidifies with the dehumidifying agent 31b, the dehumidifying agent 33b, and the dehumidifying agent 41b disposed inside the specific flow channel range, and the inflow of air from the outside of the specific flow channel range to the inside of the specific flow channel range Is suppressed by the check valve 21 and the check valve 22 as air inflow suppression means while the pressurizing pump 32 is stopped, so that dew condensation inside the specific flow path range can be suppressed even when the pressurizing pump 32 is stopped. it can. Here, not only does the pressure pump 32 be stopped when the power is supplied to the gas chromatograph 10, it is not only when the pressure pump 32 is in the inoperative state, but the power is supplied to the gas chromatograph 10. This also includes the case where the pressure pump 32 is in a non-operating state because it is not.

  Note that the air inflow suppressing means may not be the check valve as long as it can suppress the inflow of air from the outside of the specific flow path range to the inside of the specific flow path range. For example, the gas chromatograph 10 detects the specific flow path from the outside of the specific flow path range only when the pressure on the external side of the specific flow path range is higher than the specific pressure compared to the pressure on the internal side of the specific flow path range. Only when the gas flow to the inner side of the range is permitted and the pressure inside the specific channel range is higher than the specific pressure compared to the pressure outside the specific channel range One of the check valve 21 and the check valve 22, or each of the check valve 21 and the check valve 22 is a valve that allows the gas to flow from the inside to the outside of the specific flow path range. It may be provided instead.

  Since the gas chromatograph 10 includes the air inflow suppression unit, it is possible to suppress the dew condensation inside the specific flow path range even when the pressurization pump 32 is stopped, but it is not necessary to include the air inflow suppression unit.

  In the gas chromatograph 10, each of the dehumidifying agent 31b, the dehumidifying agent 33b, and the dehumidifying agent 41b is dehumidified at a high speed with the first dehumidifying agent having a high dehumidifying speed, and then is dehumidified Since the first dehumidifying agent dehumidifies, it is possible to achieve both high-speed dehumidification and long-term dehumidification.

  In the gas chromatograph 10, at least one of the dehumidifying agent 31b, the dehumidifying agent 33b, and the dehumidifying agent 41b may be configured of only one dehumidifying agent.

  Since the gas chromatograph 10 dehumidifies the inside of the VOC filter 31 with the dehumidifying agent 31b, it is possible to suppress dew condensation inside the specific flow path range of the gas chromatograph 10 and to remove volatile organic compounds by the activated carbon 31a. It is possible to suppress the ability to be reduced by the moisture inside the VOC filter 31.

  Since the gas chromatograph 10 dehumidifies the inside of the VOC filter 41 with the dehumidifying agent 41b, it is possible to suppress dew condensation inside the specific flow path range of the gas chromatograph 10 and to remove volatile organic compounds by the activated carbon 41a. It can be suppressed that the capacity is reduced by the moisture inside the VOC filter 41.

  When the pressure is high, condensation is likely to occur in the gas due to cooling by adiabatic expansion. In the gas chromatograph 10, the dehumidifying agent 33 b is disposed inside the pressure tank 33 that can store the carrier gas in a state higher than the pressure of the air around the gas chromatograph 10. Dehumidification can be performed effectively by the existing dehumidifying agent 33b.

  The activated carbon has a higher adsorption power as the pressure is higher. In the gas chromatograph 10, since the activated carbon 33a is disposed inside the pressure tank 33, the volatile organic compounds can be effectively removed by the activated carbon 33a. Here, since the gas chromatograph 10 dehumidifies the inside of the pressure tank 33 with the dehumidifying agent 33 b, the removal capacity of volatile organic compounds by the activated carbon 33 a disposed inside the pressure tank 33 is the same as that of the pressure tank 33. It is possible to suppress a decrease due to internal moisture.

  The gas chromatograph 10 uses the first filter heater 51, the pressure tank heater 52, the injection heater 53, the column heater 54, the gas sensor heater 55, and the second filter heater 56 to change the temperature of the air flow path inside the gas chromatograph 10. Since the temperature of the air around the graph 10 is higher than that of the air around the gas flow, condensation in the air flow path inside the gas chromatograph 10 can be suppressed. In particular, the gas chromatograph 10 uses the first filter heater 51, the pressure tank heater 52, the injection heater 53, the column heater 54, the gas sensor heater 55, and the second filter heater 56 to change the temperature inside the specific flow path range. Because the temperature of the surrounding air is higher than the temperature of the surrounding air, it is possible to suppress condensation in a specific flow passage range.

  In the gas chromatograph 10, the temperature of the carrier gas flow path from the pressure tank 33 to the gas sensor 40 is changed to the temperature of the air around the gas chromatograph 10 by the pressure tank heater 52, the inlet heater 53, the column heater 54 and the gas sensor heater 55. Therefore, it is possible to suppress dew condensation in the flow path from the pressure tank 33 to the gas sensor 40, in which water vapor contained in the carrier gas tends to appear as dew condensation due to cooling due to adiabatic expansion of the carrier gas.

  In the gas chromatograph 10, the temperature of the capillary column 39 is controlled to be higher than the temperature of the air around the gas chromatograph 10 by the column heater 54, so that dew condensation can be suppressed at the location of the capillary column 39. The occurrence of characteristic deterioration can be suppressed. Similarly, since the gas chromatograph 10 controls the temperature of the gas sensor 40 higher than the temperature of the air around the gas chromatograph 10 by the gas sensor heater 55, condensation can be suppressed at the location of the gas sensor 40. As a result, It is possible to suppress the occurrence of aging and characteristic deterioration of the gas sensor 40.

  The gas chromatograph 10 has a pressure A when the dew point at the pressure of the air around the gas chromatograph 10 is the temperature of the air around the gas chromatograph 10 and the temperature of the carrier gas inside the pressure tank 33 (see FIG. 7) lowers the pressure of the carrier gas inside the pressure tank 33 (S122 to S125), so that the pressure and the temperature of the carrier gas inside the pressure tank 33 are respectively the ambient air of the gas chromatograph 10. Even if the pressure and temperature become the same, condensation can be suppressed.

  In the gas chromatograph 10, even when a pulsating flow is generated in the carrier gas upstream of the pressure regulator 35 according to the operation of the pressurizing pump 32, the carrier gas whose pressure is stabilized by the pressure regulator 35 is supplied to the flow rate adjusting unit 36. Therefore, it is possible to suppress the pressure difference between the upstream side and the downstream side of the flow rate adjustment unit 36 from falling below the pressure difference for normal operation of the flow rate adjustment unit 36, and to operate the flow rate adjustment unit 36 normally. Can. Therefore, in the gas chromatograph 10, the flow rate of the carrier gas is appropriately adjusted by the flow rate adjusting unit 36 which is normally operated, and as a result, the pulsating flow of the carrier gas downstream of the flow rate adjusting unit 36 can be suppressed.

  In the gas chromatograph 10, the pressure of the carrier gas inside the pressure tank 33 is pressurized by the pressure pump 32 by the termination of the measurement and the pressure pump 32 is stopped, and the air around the gas chromatograph 10 is started. Even if the pressure drops to the same pressure as above, condensation within the pressure tank 33 can be suppressed by the various configurations described above. Therefore, in the gas chromatograph 10, moisture remaining as condensation in the pressure tank 33 enters the capillary column 39, and moisture remaining as condensation in the pressure tank 33 is stored in the pressure tank 33 during a new measurement. It is possible to suppress the carrier gas from being humidified by being taken into the new carrier gas as water vapor inside.

10 Gas chromatograph 21, 22 Check valve (air inflow suppression means)
31 VOC filter (pre-filter)
31a Activated carbon 31b Dehumidifying agent (dehumidifying part)
32 Pressure pump (pump)
33 Pressure tank
33a activated carbon 33b dehumidifying agent (dehumidifying part)
35 Pressure regulator 36 Flow rate adjustment unit 38 Injection unit 39 Capillary column (column)
40 gas sensor 41 VOC filter (post filter)
41a activated carbon 41b dehumidifying agent (dehumidifying part)
68a Temperature control means 68b Pressure control means

Claims (15)

An injection part into which the sample is injected;
A column for separating the components of the sample injected from the injection section and moved by the carrier gas;
A gas chromatograph comprising: a gas sensor for detecting the component separated by the column;
A pump that takes in the air around the gas chromatograph as the carrier gas;
A tank capable of storing the carrier gas supplied by the pump at a pressure higher than the pressure of the surrounding air;
A flow rate adjustment unit disposed at a position upstream of the column to adjust the flow rate of the carrier gas supplied from the tank;
The flow of air from the outside of a specific range including the flow path from the tank to the gas sensor among the flow paths of air inside the gas chromatograph, to the inside of the specific range, while the pump is stopped Air inflow suppressing means that can be suppressed;
And a dehumidifying part for dehumidifying,
The gas chromatograph characterized in that the dehumidifying part is disposed at at least one place inside the specific range. The at least one dehumidifying part inside the specific range includes a first dehumidifying agent and a second dehumidifying agent,
The first dehumidifying agent has a higher dehumidifying speed than the second dehumidifying agent,
2. The gas chromatograph according to claim 1, wherein the second dehumidifying agent has a larger amount of dehumidifying than the first dehumidifying agent. A pre-filter for removing at least a part of volatile organic compounds contained in the air before being supplied to the injection unit is provided outside the tank among the inside of the specific range,
The front filter is
Activated carbon for removing at least a part of volatile organic compounds contained in the air;
The gas chromatograph according to claim 1 or 2, wherein at least one of the dehumidifying parts is provided therein. A post filter is provided within the specified range to remove at least a portion of volatile organic compounds contained in air after the gas sensor detects the component.
The post filter is
Activated carbon for removing at least a part of volatile organic compounds contained in the air;
The gas chromatograph according to any one of claims 1 to 3, wherein at least one of the dehumidifying parts is provided therein.   The gas chromatograph according to any one of claims 1 to 4, wherein at least one of the dehumidifying parts is disposed inside the tank.   The gas chromatograph according to any one of claims 1 to 5, further comprising temperature control means for controlling a temperature of at least one of the column and the gas sensor to be higher than a temperature of the ambient air.   The gas chromatograph according to claim 6, wherein the temperature control means controls the temperature inside the specific range higher than the temperature of the surrounding air. An injection part into which the sample is injected;
A column for separating the components of the sample injected from the injection section and moved by the carrier gas;
A gas chromatograph comprising: a gas sensor for detecting the component separated by the column;
A pump that takes in the air around the gas chromatograph as the carrier gas;
A tank capable of storing the carrier gas supplied by the pump at a pressure higher than the pressure of the surrounding air;
A flow rate adjustment unit disposed at a position upstream of the column to adjust the flow rate of the carrier gas supplied from the tank;
A gas chromatograph comprising: a dehumidifying unit disposed inside the tank for dehumidifying.   The gas chromatograph according to claim 5 or 8, further comprising activated carbon that is disposed inside the tank and removes at least a part of a volatile organic compound contained in the carrier gas. An injection part into which the sample is injected;
A column for separating the components of the sample injected from the injection section and moved by the carrier gas;
A gas chromatograph comprising: a gas sensor for detecting the component separated by the column;
A pump that takes in the air around the gas chromatograph as the carrier gas;
A tank capable of storing the carrier gas supplied by the pump at a pressure higher than the pressure of the surrounding air;
A flow rate adjustment unit disposed at a position upstream of the column to adjust the flow rate of the carrier gas supplied from the tank;
A gas chromatograph comprising: temperature control means for controlling at least one temperature of the column and the gas sensor to be higher than a temperature of the surrounding air.   The gas chromatograph according to claim 6 or 10, wherein the temperature control means controls the temperature of the flow path of the carrier gas from the tank to the gas sensor to be higher than the temperature of the surrounding air. .   11. The gas chromatograph according to claim 10, wherein the temperature control means controls the temperature of the air flow path inside the gas chromatograph to be higher than the temperature of the surrounding air. A pressure control means for controlling the pressure of the carrier gas inside the tank above the pressure of the surrounding air and below a specific pressure;
The specific pressure is a pressure when an air dew point is a temperature of the carrier gas inside the tank, and a dew point of the ambient air pressure is a temperature of the ambient air. Item 13. The gas chromatograph according to item 7, claim 11, or claim 12. An injection part into which the sample is injected;
A column for separating the components of the sample injected from the injection section and moved by the carrier gas;
A gas chromatograph comprising: a gas sensor for detecting the component separated by the column;
A pump that takes in the air around the gas chromatograph as the carrier gas;
A tank capable of storing the carrier gas supplied by the pump at a pressure higher than the pressure of the surrounding air;
A flow rate adjustment unit disposed at a position upstream of the column to adjust the flow rate of the carrier gas supplied from the tank;
Temperature control means for controlling the temperature inside the tank higher than the temperature of the surrounding air;
Pressure control means for controlling the pressure of the carrier gas inside the tank above the pressure of the surrounding air below the specified pressure;
The gas chromatography characterized in that the specific pressure is a pressure when the dew point at the pressure of the ambient air is the temperature of the ambient air and the dew point of the air is the temperature of the carrier gas inside the tank. Tograph.   The gas chromatograph according to any one of claims 1 to 14, further comprising a pressure regulator disposed at a position downstream of the tank and upstream of the flow rate adjusting unit.

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