CN209247710U - Separation and detection system of human acetone and ethanol based on gas chromatography - Google Patents

Abstract

The separation and detection system of human acetone and ethanol based on gas chromatography belongs to the field of gas detection. In order to solve the problem that the separated gas can enter the corresponding detection channel, each detection channel does not affect each other and each channel only passes one kind of separated gas to prevent multiple The problem of impurity interference caused by the gas passing through the common channel in time order during the detection stage, the main point is to include the gas chromatography separation column (1), the two-position three-way solenoid valve, the detection channel and the sensor. The two-position three-way solenoid valve includes The first three-way solenoid valve (2), the second three-way solenoid valve (4), each solenoid valve has an input valve port and two output valve ports, and the detection channels include a carbon dioxide detection channel (3), an acetone detection channel ( 5) and the ethanol detection channel (6), the effect is: the influence of gas impurities is avoided.

Description

Separation and detection system of human acetone and ethanol based on gas chromatography

technical field

The utility model belongs to the field of gas detection and relates to a separation and detection system and method for acetone and ethanol of human body based on gas chromatography.

Background technique

Breath acetone in human breathing gas is a low concentration VOC gas. The organic gas is very soluble in water, and is easy to interact with various organic substances, so it is difficult to detect and the detection accuracy is not easy to control. Breath acetone is a biomarker for detecting diabetes, study finds. In medicine, the sampling and detection of acetone gas breathed by diabetic patients can monitor the patient's condition data in real time and reduce the patient's contact trauma. There are a variety of techniques for the detection of breath acetone. Including gas chromatography-mass spectrometry (GC-MS), proton transfer-mass spectrometry (PTR-MS), ion mobility spectrometry (IMS), selected ion flow tube mass spectrometry (SIFT-MS), electronic nose laser spectroscopy. A traditional gas chromatograph generally consists of a gas path system, a sampling system, a separation system, a temperature control system and a detection data processing system. When in use, after the analysis sample is vaporized in the inlet, it is brought into the chromatographic column by the carrier gas, and passes through the chromatographic column with different retention properties for the components in the mixture to be detected, so that the components are separated, and then introduced into the detector in turn, to The detection signals of each component were obtained. According to the order of importing into the detector, after comparison, the components can be distinguished, and the content of each component can be calculated according to the peak height or peak area. Commonly used detectors are: thermal conductivity detector, flame ionization detector, helium ionization detector, ultrasonic detector, photoionization detector, electron capture detector, flame photometric detector, electrochemical detector, mass spectrometer detector etc. In the above scheme, the components are separated and still need to be determined, and the detection and calculation of the components and their contents are relatively complicated.

Utility model content

In order to solve the problem that the separation gas can enter the corresponding detection channel, each detection channel does not affect each other and each channel only passes one kind of separation gas, so as to prevent the problem of impurity interference caused by multiple gases passing through the common channel in time sequence during the detection stage, this utility model The new proposal proposes the following technical scheme: a separation and detection system for human acetone and ethanol based on gas chromatography, including a gas chromatography separation column, a two-position three-way solenoid valve, a detection channel and a sensor. The two-position three-way solenoid valve includes The first three-way solenoid valve, the second three-way solenoid valve, each solenoid valve has an input valve port and two output valve ports, the detection channels include carbon dioxide detection channels, acetone detection channels and ethanol detection channels, and the sensors include carbon dioxide sensor, acetone sensor and ethanol sensor, the gas chromatographic separation column's inlet port is connected to the gas inlet port, the gas chromatographic separation column's gas outlet is connected to the input valve port of the first three-way solenoid valve, and the output of the first three-way solenoid valve Valve port one is connected to the carbon dioxide detection channel, the outlet port of the carbon dioxide detection channel is connected to the carbon dioxide sensor, the output valve port two of the first three-way solenoid valve is connected to the input valve port of the second three-way solenoid valve, and the output valve port of the second three-way solenoid valve is One is connected to the acetone detection channel, the gas outlet of the acetone detection channel is connected to the acetone sensor, the output valve port two of the second three-way solenoid valve is connected to the ethanol detection channel, and the gas outlet of the ethanol detection channel is connected to the ethanol sensor.

Further, the human acetone and ethanol separation and detection system based on gas chromatography also includes a single-chip microcomputer, and the carbon dioxide sensor, acetone sensor and ethanol sensor are all connected to an input port of the single-chip microcomputer, and an output of the single-chip microcomputer The port is connected to the display circuit, and the single-chip microcomputer is connected to each three-way solenoid valve, and the single-chip microcomputer counts down and sends the start control signal of the solenoid valve at the end of the timing, and the corresponding three-way solenoid valve receives the control signal to open the corresponding output valve port.

Further, the separation channel of the gas chromatographic separation column is a number of glass straight tubes bent from end to end, the length of the separation channel is 2m, the inner diameter is 2mm, and the stationary phase in the column is coated with polyethylene glycol.

Further, the sensor includes a casing tube and a detection circuit, the detection circuit is installed in the casing tube, the detection circuit is concentric and covers the connected insulating layer, Au electrode, and gas sensitive material layer by layer, and Ni-Cr is installed in the insulating layer Heating wire, electrode width 0.1mm, housing tube diameter 1mm.

A method for the separation and detection of human acetone and ethanol based on gas chromatography. The experiment measures the time for breathing gas to separate carbon dioxide, acetone and ethanol from the gas chromatographic separation column at a certain temperature, and determines the time for each solenoid valve based on this time. After the breathing gas enters the gas chromatographic separation column, the switching time of each input valve port and output valve port, so that at the corresponding temperature, different separation gases are separated, and the corresponding valve can be opened at the corresponding separation time to separate a class The gas enters its corresponding detection channel and enters the corresponding sensor.

Further, the gas chromatographic separation column performs gas separation on the input breathing gas to obtain carbon dioxide, acetone and ethanol in the breathing gas, and the two-position three-way solenoid valve separates the separated carbon dioxide, acetone and ethanol in the corresponding separation The time is opened through the corresponding valve and enters the corresponding detection channel. The sensor collects and detects the separated carbon dioxide, acetone and ethanol gas quantitatively, and transmits the data to the single-chip microcomputer, which will display the collected data.

Further, at 25°C, carbon dioxide has been completely separated at 60s, acetone has been completely separated at 300s, and ethanol has been completely separated at 630s. At 25°C, the output valve port of the first three-way solenoid valve is at 0-60s Open, the output valve port 2 is opened at 61-630s, the output valve port 1 of the second three-way solenoid valve is opened at 61-300s, and the output valve port 2 is opened at 301-630s;

At 40°C, carbon dioxide has been completely separated at 60s, acetone has been completely separated at 230s, and ethanol has been completely separated at 360s; at 40°C, the output valve port of the first three-way solenoid valve is opened at 0-60s, Valve port two is opened at 61-360s, the output valve port one of the second three-way solenoid valve is opened at 61-230s, and output valve port two is opened at 231-360s;

At 60°C, carbon dioxide has been completely separated at 60s, acetone at 150s, and ethanol at 240s; at 60°C, the output valve port of the first three-way solenoid valve is opened at 0-60s, and the output Valve port two is opened at 61-240s, the output valve port one of the second three-way solenoid valve is opened at 61-150s, and output valve port two is opened at 151-240s;

At 80°C, carbon dioxide has been completely separated in 30s, acetone has been completely separated in 72s, and ethanol has been completely separated in 120s; at 80°C, the output valve port 1 of the first three-way solenoid valve 1 is opened at 0-30s, Output valve port 2 is opened at 31-120s, output valve port 1 of the second three-way solenoid valve 2 is opened at 31-72s, and output valve port 2 is opened at 73-120s.

Further, the on-off of the solenoid valve is controlled by a single-chip microcomputer to control the switch of the detection channel. The single-chip microcomputer realizes time counting with its timer function and sends a control signal to the solenoid valve and drives the solenoid valve switch when the timing time arrives.

Beneficial effects: After the respiratory gas of the utility model is separated by the gas chromatography separation column, the time for separating the above three gases by the gas chromatography separation column is different, and the two-stage electromagnetic valve is used in conjunction to control the output valve port to make the gases separated at different times It can enter the only channel through which only this kind of gas passes, avoiding the phenomenon that the common detection channel passes back and forth in time order, resulting in the interference of impurities in the detection, and multiple detection channels correspond to multiple sensors, and the sensors can detect independently, compared with The existing common detection channels output different gases in time sequence, and the pipelines need to be detected according to the gas outlet connection. The utility model does not need to distinguish the detection components, independent channels and independent sensor detection, so that the pipelines of the system structure are directly fixed. It can directly detect the separated gas with sensors in different occasions, which is suitable for drunk driving, hospital detection, etc., and does not need to manually replace different detection sensors during detection, resulting in detection fluctuations.

Description of drawings

Fig. 1 is the principle block diagram of the separation and detection system of human acetone and ethanol based on gas chromatography.

Figure 2 is a schematic diagram of the detection channel.

Fig. 3 is the separation time of gas chromatographic separation channel for carbon dioxide, acetone and ethanol at different temperatures. In the figure: a curve is the separation time at 25°C, b curve is the separation time at 40°C, c curve is the separation time at 60°C, d curve is the separation time at 80°C.

Fig. 4 is a curve of the gradient separation time of the gas chromatographic separation channel with increasing concentrations of carbon dioxide, acetone and ethanol at 80°C. In the figure: a curve is 10 μl carbon dioxide + 0.1 μl acetone and ethanol; b curve is 20 μl carbon dioxide + 0.2 μl acetone and ethanol; c curve is 30 μl carbon dioxide + 0.3 μl acetone and ethanol; d curve is 40 μl carbon dioxide + 0.4 μl acetone and ethanol ; E curve is 50 μl carbon dioxide + 0.5 μl acetone and ethanol.

Fig. 5 is a curve of the gradient separation time of the gas chromatographic separation channel at 80°C when the concentration of carbon dioxide is 20 μl, and the concentration of acetone and ethanol increases. In the figure: a curve is 0.1 μl acetone and ethanol; b curve is 0.2 μl acetone and ethanol; c curve is 0.3 μl acetone and ethanol; d curve is 0.4 μl acetone and ethanol; e curve is 0.5 μl acetone and ethanol.

Fig. 6 is a curve of the gradient separation time of acetone and ethanol concentration increasing in the gas chromatographic separation channel at a carbon dioxide concentration of 20 μl at 60°C. In the figure: curve a is 0.3 μl acetone and ethanol; curve b is 0.4 μl acetone and ethanol; curve c is 0.5 μl acetone and ethanol.

Fig. 7 is a sectional view of a gas chromatography separation column.

Fig. 8 is a schematic structural diagram of the sensor.

Among them: 1. Gas chromatography separation column, 2. The first three-way solenoid valve, 3. Carbon dioxide detection channel, 4. The second three-way solenoid valve, 5. Acetone detection channel, 6. Ethanol detection channel, 7. Carbon dioxide sensor, 8. Acetone sensor, 9. Ethanol sensor, 10. Single-chip microcomputer, 11. Gas outlet of gas chromatography separation column, 12. Output valve port 1 of the first three-way solenoid valve, 13. Output valve port of the first three-way solenoid valve Two, 14. the input valve port of the second three-way solenoid valve, 15. the output valve port one of the second three-way solenoid valve, and 16. the output valve port two of the second three-way solenoid valve.

Detailed ways

Embodiment 1: as shown in Figure 1 and 2, a kind of separation and detection system based on gas chromatographic human body acetone, ethanol comprises gas chromatographic separation column 1, two-position three-way solenoid valve, detection channel and sensor, described The two-position three-way solenoid valve includes a first three-way solenoid valve 2 and a second three-way solenoid valve 4. Each solenoid valve has an input valve port and two output valve ports. The detection channels include a carbon dioxide detection channel 3 and an acetone detection channel. 5 and an ethanol detection channel 6, the sensor includes a carbon dioxide sensor 7, an acetone sensor 8 and an ethanol sensor 9, the air inlet of the gas chromatographic separation column 1 is connected to the air inlet, and the gas outlet 11 of the gas chromatographic separation column is connected to the first The input valve port of the three-way solenoid valve 2, the output valve port one of the first three-way solenoid valve is connected to the carbon dioxide detection channel 3, the gas outlet of the carbon dioxide detection channel 3 is connected to the carbon dioxide sensor 7, and the output valve port two of the first three-way solenoid valve 13 is connected to the input valve port 14 of the second three-way solenoid valve, and the output valve port-15 of the second three-way solenoid valve is connected to the acetone detection channel 5, and the gas outlet of the acetone detection channel 5 is connected to the acetone sensor 8, and the output port of the second three-way solenoid valve The output valve port 2 16 is connected to the ethanol detection channel 6, and the gas outlet of the ethanol detection channel 6 is connected to the ethanol sensor 9.

From the above, the utility model is a joint detection of acetone and ethanol, which can be used for acetone detection in hospitals, and can also be used for ethanol detection of drunk driving, and for the detection of drunk driving, it can also directly detect acetone for more drivers. It has an important impact on the early detection of diabetes. Diabetic patients should avoid being professional drivers, which is not conducive to the control of diabetes and driving safety. Therefore, in the detection of drunk driving, it can also detect the markers of diabetes. Important prevention and reminder significance. After the respiratory gas is separated by the gas chromatography separation column, the time for separating the above three gases with the gas chromatography separation column is different. Use two-stage solenoid valves in conjunction to control the output valve port so that the separation time is different. The gas can enter the only channel, and only this kind of gas passes through the channel, which avoids the phenomenon that the common detection channel passes back and forth in time order, which leads to the interference of detection impurities, and multiple detection channels correspond to multiple sensors, and the sensors can detect independently. Since the existing common detection channels output different gases in time sequence, it is necessary to detect the pipelines according to the gas outlet connections. The utility model does not need to distinguish the detection components, independent channels and independent sensor detection, so that the pipelines of the system are directly fixed , It can directly detect the separated gas with sensors in different occasions, which is suitable for drunk driving, hospital detection, etc., and does not need to manually replace different detection sensors during detection, resulting in detection fluctuations.

The separation and detection system of human acetone and ethanol based on gas chromatography also includes a single-chip microcomputer 10, and the carbon dioxide sensor 7, acetone sensor 8 and ethanol sensor 9 are all connected to an input port of the single-chip microcomputer 10, and the single-chip microcomputer 10 One of the output ports is connected to the display circuit, and the single-chip microcomputer 10 is connected to each three-way solenoid valve, and the single-chip microcomputer 10 counts down and sends the start control signal of the solenoid valve at the end of the timing, and receives the control signal by the corresponding three-way solenoid valve To open the corresponding output valve port, this means is used to realize the control of the solenoid valve in automatic control, so that the detection is fully automated, the breathing gas enters and the timing is started by the single-chip microcomputer, and the control of the corresponding valve is issued at different timings. The signal, thus, realizes the automatic gas channel independent output.

The separation and detection system of human body acetone and ethanol based on gas chromatography, the separation channel of the gas chromatography separation column is a number of glass straight tubes bent from head to tail, the length of the separation channel is 2m, the inner diameter is 2mm, and the stationary phase in the column is coated with Covered with polyethylene glycol.

The separation and detection system of human acetone and ethanol based on gas chromatography, the sensor includes a casing tube and a detection circuit, the detection circuit is installed in the casing tube, and the detection circuit is a concentric insulating layer that is covered and connected layer by layer, Au electrode, gas sensitive material, Ni-Cr heating wire installed in the insulating layer, electrode width 0.1mm, shell tube diameter 1mm. Gas sensitive material: A sensitive material that can change the resistance value according to the change of a certain gas concentration. The gas-sensing materials corresponding to the above-mentioned gases belong to the prior art, and the gas-sensing materials corresponding to the detected gases can be selected, which belongs to the conventional technical selection in the field. Moreover, the sensor capable of detecting the above-mentioned gas belongs to the prior art. This embodiment provides a sensor capable of heating, which can maintain the detection at a certain temperature and improve the detection accuracy.

A method for separation and detection of human acetone and ethanol based on gas chromatography. The experiment measures the time for breathing gas to separate carbon dioxide, acetone and ethanol gas from the gas chromatography separation column 1 at a certain temperature, and determines the time for each electromagnetic gas by this time. After the breathing gas enters the gas chromatographic separation column 1, the switching time of each input valve port and output valve port, so that at the corresponding temperature, different separation gases are separated, and the corresponding valve can be opened at the corresponding separation time to separate the A type of gas enters its corresponding detection channel and enters the corresponding sensor.

In the gas chromatography-based separation and detection method of human acetone and ethanol, the gas chromatography separation column 1 performs gas separation on the input breathing gas to obtain carbon dioxide, acetone and ethanol in the breathing gas, and the two-position three-way electromagnetic The valve will open the separated carbon dioxide, acetone and ethanol gas through the corresponding valve at the corresponding separation time, and enter the corresponding detection channel. The sensor will quantitatively collect and detect the separated carbon dioxide, acetone and ethanol gas, and The data is transmitted to the single-chip microcomputer 10, and the collected data is displayed by the single-chip microcomputer 10.

The separation and detection method of human acetone and ethanol based on gas chromatography,

At 25°C, carbon dioxide is completely separated at 60s, acetone is completely separated at 300s, and ethanol is completely separated at 630s. At 25°C, the output valve port 12 of the first three-way solenoid valve is opened at 0-60s. The output valve port 2 is opened at 61-630s, the output valve port 15 of the second three-way solenoid valve is opened at 61-300s, and the output valve port 2 is opened at 301-630s;

At 40°C, carbon dioxide is completely separated at 60s, acetone is completely separated at 230s, and ethanol is completely separated at 360s; at 40°C, the output valve port 12 of the first three-way solenoid valve is opened at 0-60s, The output valve port 2 is opened at 61-360s, the output valve port 15 of the second three-way solenoid valve is opened at 61-230s, and the output valve port 2 is opened at 231-360s;

At 60°C, carbon dioxide is completely separated at 60s, acetone is completely separated at 150s, and ethanol is completely separated at 240s; at 60°C, the output valve port 12 of the first three-way solenoid valve is opened at 0-60s, The output valve port 2 is opened at 61-240s, the output valve port 15 of the second three-way solenoid valve is opened at 61-150s, and the output valve port 2 is opened at 151-240s;

At 80°C, carbon dioxide has been completely separated at 30s, acetone has been completely separated at 72s, and ethanol has been completely separated at 120s; at 80°C, the output valve port 1 of the first three-way solenoid valve 21 is opened at 0-30s , the output valve port two is opened at 31-120s, the output valve port one of the second three-way solenoid valve 42 is opened at 31-72s, and the output valve port two is opened at 73-120s.

In the separation and detection method of human body acetone and ethanol based on gas chromatography, the electromagnetic valve is controlled by the single-chip microcomputer 10 to control the switch of the detection channel, and the described single-chip microcomputer 10 realizes time counting with its timer function and counts the time When the time is up, a control signal is sent to the solenoid valve and the switch of the solenoid valve is driven.

Embodiment 2: The traditional gas chromatograph has the disadvantages of large space occupied by the gas source, too long chromatographic column volume, fragile detector and easy contamination, and needs the protection of carrier gas and works in a clean environment, which leads to Traditional gas chromatographs are not suitable for some special environments and working conditions. However, some of these technologies have the problems of cumbersome detection methods and inconvenient portability. As shown in FIG. 1 , this embodiment provides a human acetone respiration instrument based on gas chromatography, which includes a gas chromatography separation column 1, a two-position three-way solenoid valve, a detection channel, a sensor detection and a display circuit. The gas chromatographic separation column 1 is used for gas separation of the input mixed gas to obtain carbon dioxide, acetone and ethanol gas in the breathing gas; the two-position three-way solenoid valve is to separate the separated carbon dioxide, acetone and ethanol gas Corresponding separation time enters in corresponding detection channel; Described sensor detection circuit is to utilize sensor to carry out quantitative detection to separated carbon dioxide, acetone and ethanol gas; Described detection circuit utilizes single-chip microcomputer 10 to detect carbon dioxide, acetone And the content of ethanol gas is displayed on the single-chip microcomputer 10.

The gas chromatographic separation column 1 is a 2m long spiral glass column with an inner diameter of 2mm, and the coated stationary phase is polyethylene glycol. The front end is connected to the air inlet, and the rear end is connected to the first three-way solenoid valve 2. The two-position three-way solenoid valve is two two-position three-way solenoid valves. The first three-way solenoid valve 2 includes an input valve port, an output valve port 1, and an output valve port 2, the input valve port is connected to the outlet of the gas chromatography separation column 1 at the front end, the output valve port 1 is connected to the carbon dioxide detection channel 3, and the output valve port 2 Connect the input valve port 14 of the second three-way solenoid valve with two positions and three-way; the second three-way solenoid valve 4 includes an input valve port, an output valve port one, and an output valve port two, and the input valve port is connected to the output valve port two of the valve one , the output valve port one is connected to the acetone detection channel 5, and the output valve port two is connected to the ethanol detection channel 6. As for the gas sensor, the carbon dioxide gas sensor is placed in the carbon dioxide detection channel 3; the acetone gas sensor is placed in the acetone detection channel 5; and the ethanol gas sensor is placed in the ethanol detection channel 6. The single-chip microcomputer 10 is used to display the detected contents of carbon dioxide, acetone and ethanol.

The working process includes the following stages: Gas separation stage: Breathing gas is blown into the gas chromatography separation channel, and carbon dioxide, acetone and ethanol gases are separated by using the gas chromatography principle. Time-sharing switch stage: the respiratory gas passes through the gas chromatographic separation channel to separate carbon dioxide, acetone and ethanol gas at different times. Through the switch of the two-position three-way valve, the three gases enter the corresponding detection channels. The two-position three-way solenoid valve is controlled by the single-chip microcomputer 10 for switching. It can be seen from Figure 3 that at 25°C, carbon dioxide has been completely separated at 60s, acetone has been completely separated at 300s, and ethanol has been completely separated at 630s; at 40°C, carbon dioxide has been completely separated at 60s, and acetone has been completely separated at 230s. Separation, ethanol has been completely separated at 360s; at 60°C, carbon dioxide has been completely separated at 60s, acetone has been completely separated at 150s, ethanol has been completely separated at 240s; at 80°C, carbon dioxide has been completely separated at 30s, Acetone has been completely separated at 72s, and ethanol has been completely separated at 120s. Therefore, at 25°C, the output valve port 1 of the first three-way solenoid valve is opened at 0-60s, the output valve port two is opened at 61-630s, and the output valve port one of the second three-way solenoid valve is opened at 61-300s , the output valve port two is opened at 301-630s; at 40°C, the output valve port one of the first three-way solenoid valve is opened at 0-60s, the output valve port two is opened at 61-360s, and the second three-way solenoid valve’s The output valve port 1 is opened at 61-230s, and the output valve port 2 is opened at 231-360s; at 60°C, the output valve port 12 of the first three-way solenoid valve is opened at 0-60s, and the output valve port 2 is opened at 61-360s. 240s open, the output valve port one of the second three-way solenoid valve is opened at 61-150s, and the output valve port two is opened at 151-240s; at 80°C, the output valve port one of the first three-way solenoid valve is at 0-12 30s open, the output valve port 2 is opened at 31-120s, the output valve port 1 of the second three-way solenoid valve is opened at 31-72s, and the output valve port 2 is opened at 73-120s. The solenoid valve is controlled by the single-chip microcomputer 10, and the switching of the channel is controlled by the single-chip microcomputer 10 turning on and off the solenoid valve. Detection stage: Quantitative detection of carbon dioxide, acetone and ethanol in the breathing gas through three gas sensors of carbon dioxide, acetone and ethanol. Display stage: connect the gas sensor with the single-chip microcomputer 10, and display the contents of carbon dioxide, acetone and ethanol through the display screen of the single-chip microcomputer 10.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, any person familiar with the technical field within the technical scope of the disclosure of the present invention, according to the present invention Any equivalent replacement or change of the created technical solution and its inventive concept shall be covered within the scope of protection of the present invention.

Claims (4)

1. a kind of separation and detection system of the human body acetone based on gas-chromatography, ethyl alcohol, which is characterized in that including gas-chromatography Splitter (1), two-bit triplet solenoid valve, sense channel and sensor, the two-bit triplet solenoid valve include the one or three energization Magnet valve (2), the second three-way magnetic valve (4), each solenoid valve has input valve port and two output valve ports, the sense channel include Carbon dioxide sense channel (3), acetone sense channel (5) and ethyl alcohol sense channel (6), the sensor include that carbon dioxide passes The inlet end of sensor (7), acetone sensor (8) and ethanol sensor (9), the gas-chromatography splitter (1) connects air inlet, Gas-chromatography splitter gas outlet (11) connection the first three-way magnetic valve (2) input valve port, the first three-way magnetic valve it is defeated Valve port one (12) connection carbon dioxide sense channel (3) out, carbon dioxide sense channel (3) gas outlet connect carbon dioxide sensing Device (7), the output valve port two (13) of the first three-way magnetic valve connect the input valve port (14) of the second three-way magnetic valve, the second threeway The output valve port one (15) of solenoid valve connects acetone sense channel (5), and acetone sense channel (5) gas outlet connects acetone sensor (8), the output valve port two (16) of the second three-way magnetic valve connects ethyl alcohol sense channel (6), and ethyl alcohol sense channel (6) gas outlet connects Connect ethanol sensor (9).

2. the separation and detection system of human body acetone, ethyl alcohol based on gas-chromatography, feature exist as described in claim 1 In further including single-chip microcontroller (10), the carbon dioxide sensor (7), acetone sensor (8) and ethanol sensor (9) connect An input port of single-chip microcontroller (10) is connect, a delivery outlet of the single-chip microcontroller (10) connects display circuit, the monolithic Machine (10) is connect with each three-way magnetic valve, ends the starting control of sending solenoid valve by the single-chip microcontroller (10) countdown and in timing Signal processed, and control signal is received to open corresponding output valve port by corresponding three-way magnetic valve.

3. the separation and detection system of human body acetone, ethyl alcohol based on gas-chromatography, feature exist as described in claim 1 In, the split tunnel of the gas-chromatography splitter is the glass straight tube of several head and the tail bending connection, and split tunnel length is 2m, Internal diameter 2mm, stationary phase coats polyethylene glycol in column.

4. the separation and detection system of human body acetone, ethyl alcohol based on gas-chromatography, feature exist as described in claim 1 In, the sensor includes shell pipe and detection circuit, and detection circuit is mounted in shell pipe, detection circuit be it is concentric and by Insulating layer, the Au electrode, gas sensitive material of layer covering connection, the interior installation Ni-Cr heater strip of insulating layer, electrode width 0.1mm, Shell pipe diameter 1mm.