Multi-channel automatic sampling device and method thereof

Abstract

The invention discloses a multi-channel automatic sample injection device and method, and the device is characterized in that the device comprises a plurality of sample injection units, an air pump, a sensor unit, a control unit and a power interface, each sample injection unit is provided with an air tap and an electromagnetic valve which are correspondingly communicated, and each air tap is provided with a detection assembly used for detecting the installation state of an air bag; an air pump inlet is communicated with an outlet of the electromagnetic valve group; an air pump outlet is communicated with an air outlet of the sampling device; programs and algorithms are built in the control unit, at least comprise a compensation algorithm and are used for compensating the accumulated sample injection volume to obtain an effective sample injection volume, and sample injection is stopped when the effective sample injection volume is larger than or equal to the target sample injection volume; according to the invention, a plurality of samples can be cyclically injected at the same time, the clinical batch detection efficiency is greatly improved, data is collected in real time based on a sensor, errors caused by air bag expansion, leakage and environment air pressure difference are corrected through a compensation algorithm, the power of an air pump is adjusted in combination with PID, the target sample injection volume is controlled, and the sample injection precision is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of gas sampling technology, and more specifically, to a multi-channel automatic sampling device and method. Background Technology

[0002] In the field of clinical breath analysis, the breath analyzer is the core equipment for sample testing, and the efficiency, accuracy, and reliability of its sample introduction process directly affect the clinical diagnostic results. Currently, the mainstream breath analysis sample introduction methods are mainly divided into traditional manual sample introduction and single-channel sample introduction. Traditional manual sample introduction involves an operator drawing the sample from a breath bag or test tube using a syringe or syringe and then introducing it into the analyzer; single-channel automatic sample introduction can only process one sample at a time.

[0003] Traditional manual sample introduction relies on manual operation throughout the entire process, which is not only cumbersome and labor-intensive, resulting in low testing efficiency and failing to meet the needs of batch clinical sample processing, but also prone to inconsistencies in sample collection volume due to differences in operating habits among different operators or fluctuations in the operating time of the same operator, affecting the accuracy of sample introduction. At the same time, the probability of samples coming into contact with the external environment and instruments during manual operation is relatively high, which can easily lead to cross-contamination between different samples, resulting in unreliable measurement results. Although single-channel automated sample introduction devices reduce reliance on manual operation to some extent, they still have the limitation of low efficiency due to their single-channel design.

[0004] Therefore, how to use effective technical means to solve the existing deficiencies and shortcomings is the direction that those engaged in this industry urgently want to improve. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a multi-channel automated sample introduction device and method.

[0006] The technical solution of the present invention is: a multi-channel automatic sample introduction device, comprising: Several injection units are provided, each injection unit is equipped with a gas nozzle and a solenoid valve, the gas nozzle is connected to the inlet of the solenoid valve, and each gas nozzle is equipped with a detection component for detecting the installation status of the gas bag; the outlets of several solenoid valves are connected to form a solenoid valve group. An air pump, wherein the air pump inlet is connected to the outlet of the solenoid valve group, and the air pump outlet is connected to the air outlet of the sample injection device, for providing sample injection power; The sensor unit includes at least a gas flow sensor and a pressure sensor, and the sensor unit is connected between the solenoid valve and the gas pump for collecting the gas flow rate and pressure in the sample injection path; The control unit is connected to the plurality of injection units, sensor units and air pumps, and has built-in programs and algorithms for collecting and processing sensor data, controlling solenoid valves and adjusting air pump power; wherein, the algorithm includes at least a compensation algorithm for compensating the cumulative injection volume according to the air bag pressure to obtain an effective injection volume, and stopping injection when the effective injection volume is greater than or equal to the target injection volume; A power interface, extending from the control unit, is used to provide operating power to the sample introduction device.

[0007] As an improvement of this embodiment of the invention, it also includes a gas washing unit, which includes a gas washing port and a gas washing solenoid valve. The gas washing solenoid valve is disposed in the solenoid valve group, and the inlet of the gas washing solenoid valve is connected to the gas washing port.

[0008] As an improvement of this embodiment of the invention, the number of injection units is eight, and the solenoid valve is a two-position two-way solenoid valve.

[0009] As an improvement to this embodiment of the invention, a display screen is also included, which is electrically connected to the control unit and is used to display the injection status and injection data.

[0010] As an improvement of this embodiment of the invention, the control unit also has a program debugging port for debugging the program and algorithm in the control unit.

[0011] As an improvement to this embodiment of the invention, the detection component is a magnetic ring or a photoelectric sensor.

[0012] To achieve one of the above-mentioned objectives, the present invention provides a multi-channel automated sample introduction method for use in any of the multi-channel automated sample introduction devices described above, comprising the following steps: S1: The control unit acquires the target injection volume and gas pump power parameters; S2: Start the target injection unit sequentially according to the preset order and perform cyclic injection. During the injection process, calculate the cumulative injection volume based on the flow integral algorithm and automatically adjust the gas pump power. S3: Based on the compensation algorithm, the cumulative injection volume is compensated according to the air bag pressure to obtain the effective injection volume. When the effective injection volume is greater than or equal to the target injection volume, the injection is stopped.

[0013] As an improvement of this embodiment of the invention, when the multi-channel automatic sampler is equipped with a gas washing unit, the method further includes step S4: cleaning all target sample injection units after sample injection is completed.

[0014] As an improvement to this embodiment of the invention, in step S2, the control unit collects the gas flow rate and pressure in the injection path in real time; The flow integral algorithm performs integral calculations based on the sampling period and the gas flow rate to obtain the cumulative injection volume, and calculates the volume error based on the ratio of the pressure to the preset pressure. Based on the volume error, a PID controller is used to adjust the gas pump power.

[0015] As an improvement to this embodiment of the invention, in step S3, the control unit acquires the air bag compliance parameter and calculates the pressure decay rate; the compensation algorithm performs inflation compensation and leakage compensation based on the air bag pressure, the air bag compliance parameter, and the pressure decay rate to obtain the air bag inflation volume and leakage volume, and the effective injection volume. ,in, To accumulate the injection volume, This refers to the volume of the inflated airbag. For the leakage volume, The sampling time.

[0016] The advantages of the multi-channel automated sample introduction device and method provided by this invention are as follows: Multiple channels are independently controllable, enabling simultaneous cyclic injection of multiple samples without manual operation. The detection component monitors the gas bag installation status in real time, automatically alarming and skipping the channel in case of abnormality, thus avoiding misoperation and significantly improving the efficiency of clinical batch testing. Based on real-time data acquisition from sensors, a compensation algorithm corrects errors caused by gas bag inflation, leakage, and differences in ambient air pressure. Combined with PID control of the air pump power, the target injection volume is controlled, greatly improving injection accuracy. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the multi-channel automatic sampler described in this invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of the multi-channel automatic sampler described in this invention. Figure 2 ; Figure 3 This is a schematic flowchart of the multi-channel automated sample introduction method described in this invention.

[0018] Wherein: 1-air nozzle, 2-solenoid valve group, 21-solenoid valve, 211-solenoid valve inlet, 22-solenoid valve group outlet, 23-washing gas solenoid valve, 231-washing gas solenoid valve inlet; 3-air pump, 31-air pump inlet, 32-air pump outlet; 4-sensor unit; 5-control unit, 51-expansion interface, 52-program debugging interface; 6-sample injection device outlet; 7-display screen; 8-washing gas port. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the scope of protection of the present invention.

[0020] The scope of embodiments described herein includes the entire scope of the claims and all available equivalents thereof. Throughout this document, the terms “first,” “second,” etc., are used only to distinguish one element from another without requiring or implying any actual relationship or order between the elements. Indeed, a first element can also be referred to as a second element, and vice versa. Furthermore, the terms “comprising,” “including,” or any other variations thereof are intended to cover a non-exclusive inclusion, such that a structure, apparatus, or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a structure, apparatus, or device. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the structure, apparatus, or device that includes said element.

[0021] This invention provides a multi-channel automatic sample introduction device, such as... Figure 1 As shown, it includes: Several injection units are provided, each injection unit is equipped with a nozzle 1 and a solenoid valve 21, the nozzle 1 is connected to the inlet of the solenoid valve 21, and each nozzle 1 is equipped with a detection component for detecting the installation status of the air bag; the outlets of several solenoid valves 21 are connected to form a solenoid valve group 2. Air pump 3, the inlet of which is connected to the outlet of solenoid valve group 2, and the outlet of air pump 3 is connected to the air outlet 6 of the sample injection device, for providing sample injection power; Sensor unit 4 includes at least a gas flow sensor and a pressure sensor. Sensor unit 4 is connected between the solenoid valve 21 and the air pump 3, and is used to collect the gas flow rate and pressure in the sample injection path. In practice, sensor unit 4 is also equipped with a temperature sensor and a humidity sensor to collect the temperature and humidity in the sample injection path. In practice, the gas path of the sample injection device can be made of PVC tubing.

[0022] The control unit 5 is connected to the plurality of injection units, sensor units 4 and air pump 3. It has built-in programs and algorithms for collecting and processing sensor data, controlling solenoid valve 21 and adjusting the power of air pump 3. The algorithm includes at least a compensation algorithm for compensating the cumulative injection volume according to the air bag pressure to obtain the effective injection volume. When the effective injection volume is greater than or equal to the target injection volume, the injection is stopped. A power interface, derived from the control unit 5, is used to provide operating power to the sample introduction device.

[0023] In this embodiment, as Figure 2 As shown, it also includes a gas scrubbing unit, which includes a gas scrubbing port 8 and a gas scrubbing solenoid valve 23. The gas scrubbing solenoid valve 21 is disposed in the solenoid valve group 2, and the gas scrubbing solenoid valve inlet 231 is connected to the gas scrubbing port 8.

[0024] In some specific embodiments, the detection component can be a magnetic ring or a photoelectric sensor. When using a magnetic ring, if the gas bag is installed, the magnetic ring and the gas nozzle 1 generate a preset potential difference; if the gas bag is not installed, the potential difference between the magnetic ring and the gas nozzle 1 is zero. When using a photoelectric sensor, the installation status of the gas bag is determined by the continuity of the optical path between the transmitting and receiving ends. If the gas bag is not installed, the optical path is unobstructed; if it is installed, the gas bag interface blocks the optical path, and the photoelectric sensor sends a detection signal to the control unit 5. When the gas bag is not installed, the control unit 5 prohibits the sample injection unit from injecting samples and issues an alarm. It is understood that detecting whether the gas bag is installed can prevent injection failures caused by improper installation.

[0025] In this embodiment, the number of injection units is eight, such as... Figure 1 As shown, eight injection units are arranged in a uniform array on the mounting panel of the main body of the injection device. The center-to-center distance between the nozzles 1 of adjacent injection units can be 30~50mm, ensuring sufficient operating space between the nozzles 1 of each unit, facilitating the installation and removal of gas bags, and preventing interference between gas bags when multiple channels are working simultaneously. Each injection unit is equipped with a nozzle 1, a detection component, and a corresponding two-position two-way solenoid valve 21. The solenoid valve 21 is fixed by an integrated valve seat, and the control pin of the solenoid valve 21 is connected one-to-one to the IO interface of the control unit 5 through a shielded cable to ensure stable transmission of control signals. The eight injection units are numbered sequentially from 1 to 8. The control unit 5 has a built-in channel address allocation program, which can realize independent control of a single injection unit. In practice, it can also be set to multi-channel synchronous operation or sequential operation according to requirements. The installation position of each injection unit is marked with a number and gas bag installation mark for easy identification and operation by the operator.

[0026] In this embodiment, the multi-channel injection device also includes a display screen 7, which is electrically connected to the control unit 5 and used to display the injection status and injection data. In practice, the display screen 7 can be an industrial-grade high-definition touch screen 7. The display screen 7 is fixedly connected to the mounting groove at the front end of the injection device housing via a snap-on bracket. The display screen 7 and the control unit 5 can be electrically connected via an RS485 communication interface. The interface layout of the display screen 7 is divided into a status display area, a data display area, and an operation menu area. The status display area is located at the top of the screen and displays information such as the current operating status of the injection device, the number of active channels, and the working status of the gas pump 3 in real time. The operating status can be standby, running, or fault. The data display area is located in the middle of the screen and can display data such as the target injection volume, injected volume, effective injection volume, real-time flow rate, and current pressure of each channel according to the channel number. The operation menu area is located at the bottom of the screen and can be equipped with function buttons such as start or stop, parameter setting, channel selection, data query, and system settings. The control unit 5 has a built-in driver for the display screen 7, which can realize functions such as dynamic updating of display content, data refresh, and interface switching. When the sample introduction device malfunctions, such as the gas bag not being installed properly, abnormal gas pressure, excessive flow, or abnormal temperature or humidity, the display screen 7 will pop up a fault alarm prompt box, and the status display area will flash red to remind the operator. The fault prompt information includes the fault type and the channel number involved.

[0027] In this embodiment, the control unit 5 also provides a program debugging interface 52 for debugging the programs and algorithms within the control unit 5. The program debugging interface 52 is electrically connected to the control unit 5. To improve the safety and compatibility of the debugging process, in some specific implementations, the program debugging interface 52 incorporates an electrostatic discharge (ESD) protection component and a signal isolation module. The ESD protection component prevents ESD interference from damaging the core components of the control unit 5; the signal isolation module uses optocoupler isolation to effectively isolate electrical interference between the debugging equipment and the control unit 5.

[0028] In some specific embodiments, the control unit 5 also provides an expansion interface 51 for connecting multiple sample introduction devices. In practice, the expansion interface 51 can be an RS-232 interface, embedded in an independent interface cavity mounted on the side of the sample introduction device housing.

[0029] The working principle of the multi-channel automatic sample introduction device of the present invention is as follows: Gas bags are installed correspondingly to the nozzles 1 of each sample introduction unit. The detection component detects the installation status of the gas bags in real time and feeds back to the control unit 5. Parameters such as the target sample introduction volume and sample introduction channel are set through an external control device or display screen 7 connected to the sample introduction device. The control unit 5 starts the air pump 3 according to a preset program and opens the solenoid valve 21 of the corresponding channel. The airflow generated by the air pump 3 enters the gas bag through the solenoid valve 21 group 2 and the sensor unit 4. The sensor unit 4 collects flow and pressure data in real time and transmits it to the control unit 5. When the effective sample introduction volume reaches the target value, the control unit 5 closes the corresponding solenoid valve 21 and the air pump 3. When the multi-channel automatic sample introduction device is equipped with a gas washing unit, the gas washing unit cleans each sample introduction unit to complete the automatic sample introduction.

[0030] This invention provides a multi-channel automated sample introduction method for use in any of the multi-channel automated sample introduction devices described above, such as... Figure 2 As shown, it includes the following steps: S1: The control unit 5 acquires the target injection volume and the power parameters of the air pump 3; In practice, when the sample introduction device is connected to an external control device, the external control device can be a computer, a sample analysis instrument, an automated workstation, etc. The external control device sends synchronization parameter signals to the control unit 5 through the expansion interface 51. For example, the sample analysis instrument outputs the instruction "target injection volume 3mL, gas pump 3 power 50%" to the sample introduction device control unit 5 according to the detection requirements. The control unit 5 receives and parses the signal to obtain the corresponding parameters.

[0031] When the sample introduction device is equipped with a display screen 7, the operator can access the parameter setting interface through the display screen 7, enter the specific value in the target sample introduction volume input box, and select the corresponding power level in the gas pump 3 power adjustment option. After inputting the data, clicking the confirmation button will transmit the parameter data from the display screen 7 to the control unit 5. To improve sample introduction efficiency, in some specific embodiments, the control unit 5 has a built-in parameter database that stores standard parameter combinations for common experimental scenarios. For example, the target sample introduction volume and matching gas pump 3 power corresponding to different sample types and gas bag specifications can be retrieved through the scenario selection menu on the display screen 7 without manual input.

[0032] When multiple injection devices are networked through expansion interface 51, control devices such as computers and industrial tablets send parameter commands to the control units 5 of each injection device via TCP / IP protocol. The main control device can batch set the target injection volume and gas pump 3 power parameters of one or more injection devices through the built-in injection device control software. The parameter data is transmitted to the control unit 5 via the Ethernet link of expansion interface 51.

[0033] S2: Start the target injection unit sequentially according to the preset order and perform cyclic injection. During the injection process, calculate the cumulative injection volume based on the flow integral algorithm and automatically adjust the power of the air pump 3. In some specific implementations, the preset sequence can be a grouping mode, a sequential mode, or a priority mode, which can be selected via the display screen 7 or a remote control terminal. Specifically, the grouping mode divides the target injection units into several groups, with injection units within a group starting synchronously and injections occurring sequentially between groups according to unit numbers, suitable for batch parallel injection requirements; the sequential mode starts injection units sequentially according to their numbers, and after completing the injection cycle of one injection unit, it automatically starts the next injection unit until all target injection units have completed injection; the priority mode sets a priority for each target injection unit, with the control unit 5 prioritizing the start of high-priority injection units, and then starting low-priority injection units after completion, suitable for scenarios where urgent samples are mixed with regular samples.

[0034] In practice, before activating the target injection unit, the control unit 5 first confirms the gas bag installation status of the corresponding unit through the detection component, and simultaneously verifies the on / off status of the solenoid valve 21 of that unit and the initial pressure of the corresponding gas path. The activation operation is only performed when the gas bag is properly installed, the solenoid valve 21 is in normal condition, there is no abnormal pressure in the gas path, and the temperature and humidity are normal. If the verification fails, an alarm is triggered indicating that the activation conditions are not met, and the abnormal injection unit is skipped or retried. The control unit 5 sends a conduction command to the solenoid valve 21 of the target injection unit, and the gas path is connected after conduction. Simultaneously, the control unit 5 records the conduction time of the solenoid valve 21 as the starting reference for injection timing and volume calculation.

[0035] During the sample introduction process, the control unit 5 collects the gas flow rate and pressure in the sample introduction path in real time; The flow rate integral algorithm calculates the cumulative injection volume by integrating the sampling period and the gas flow rate, and calculates the volume error based on the ratio of the pressure to the preset pressure. A PID controller is then used to adjust the power of the gas pump 3 based on this volume error. Specifically, , , ,in, For volume error, For the target injection volume, To accumulate the injection volume, Sampling time, The sampling period is Let be the gas flow rate in the i-th sampling period. For actual volumetric flow rate, The flow rate is measured by the flow sensor. The pressure is measured by the pressure sensor. The atmospheric pressure used for calibrating the pressure sensor can be 101 kPa. The control unit 5 adjusts the air pump 3 based on the volume error. >50%* At that time, it operates at the initial power; when 20%* ≤ ≤50%* At that time, the power is finely adjusted based on whether the instantaneous flow rate is within the preset range; when <20%* At the same time, gradually reduce the power by 5%-10% each time to slow down the injection rate.

[0036] S3: Based on the compensation algorithm, the cumulative injection volume is compensated according to the air bag pressure to obtain the effective injection volume. When the effective injection volume is greater than or equal to the target injection volume, the injection is stopped. To improve sample introduction accuracy, this invention employs adaptive compensation for gas bag inflation, micro-leakage, and changes in ambient air pressure. In some specific embodiments, the control unit 5 acquires gas bag compliance parameters and calculates the pressure decay rate; the compensation algorithm performs inflation compensation and leakage compensation based on the gas bag pressure, the gas bag compliance parameters, and the pressure decay rate to obtain the gas bag inflation volume and leakage volume. Specifically... , , , , , ,in, For effective injection volume, This refers to the volume of the inflated airbag. For the leakage volume, The airbag compliance parameter was calibrated experimentally. This represents the increase in pressure. Sampling time The pressure of the air bag at that time This represents the initial pressure of the gas bag before sample injection. This represents the leakage volume rate.

[0037] In some specific implementations, it can be achieved through For effective injection volume Perform standard condition conversion, where, The standard atmospheric pressure is 101.325 kPa. The standard temperature is 25℃. Sampling time The temperature at that time.

[0038] In this embodiment, when the multi-channel automatic sampler is equipped with a gas washing unit, the method further includes step S4: cleaning all target sample injection units after sample injection is completed. Specifically, when the control unit 5 detects that all target sample injection units have completed sample injection, it automatically triggers the cleaning program; if a fault interruption occurs during the sample injection process, the operator can start the cleaning program through the manual cleaning button on the display screen 7 or a remote command to clean the injected units individually. The cleaning program involves the control unit 5 issuing a command to close all the corresponding solenoid valves 21 connected to the eight gas nozzles 1, completely isolating the gas bag connected to the gas nozzle 1 from the internal gas path; then, it controls the gas washing solenoid valve 23 to open, and the inlet 231 of the gas washing solenoid valve is connected to the outside air through the gas washing port 8, using the outside air to perform gas washing operation on the internal gas path. Understandably, since the solenoid valve 21 corresponding to the gas nozzle 1 is in the closed state, outside air will not flow back into the gas bag through the solenoid valve 21, thus avoiding dilution of the sample gas in the gas bag and ensuring the accuracy of subsequent sample gas detection results. The gas washing process lasts for a preset time. After the gas washing is completed, the control unit 5 closes the gas washing solenoid valve 23, and the cleaning program ends.

[0039] The embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles of the embodiments, their practical application, or technological improvements in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A multi-channel automatic sample introduction device, characterized in that, include: Several injection units are provided, each injection unit is equipped with a gas nozzle and a solenoid valve, the gas nozzle is connected to the inlet of the solenoid valve, and each gas nozzle is equipped with a detection component for detecting the installation status of the gas bag; the outlets of several solenoid valves are connected to form a solenoid valve group. An air pump, wherein the air pump inlet is connected to the outlet of the solenoid valve group, and the air pump outlet is connected to the air outlet of the sample injection device, for providing sample injection power; The sensor unit includes at least a gas flow sensor and a pressure sensor, and the sensor unit is connected between the solenoid valve and the gas pump for collecting the gas flow rate and pressure in the sample injection path; The control unit is connected to the plurality of injection units, sensor units and air pumps, and has built-in programs and algorithms for collecting and processing sensor data, controlling solenoid valves and adjusting air pump power; wherein, the algorithm includes at least a compensation algorithm for compensating the cumulative injection volume according to the air bag pressure to obtain an effective injection volume, and stopping injection when the effective injection volume is greater than or equal to the target injection volume; A power interface, extending from the control unit, is used to provide operating power to the sample introduction device.

2. The multi-channel automatic sampler according to claim 1, characterized in that, It also includes a gas scrubbing unit, which includes a gas scrubbing port and a gas scrubbing solenoid valve. The gas scrubbing solenoid valve is disposed in the solenoid valve group, and the inlet of the gas scrubbing solenoid valve is connected to the gas scrubbing port.

3. The multi-channel automatic sampler according to claim 1, characterized in that, The number of sample injection units is eight, and the solenoid valve is a two-position two-way solenoid valve.

4. The multi-channel automatic sampler according to claim 1, characterized in that, It also includes a display screen, which is electrically connected to the control unit, for displaying the injection status and injection data.

5. The multi-channel automatic sampler according to claim 1, characterized in that, The control unit also has a program debugging port for debugging the programs and algorithms in the control unit.

6. The multi-channel automatic sampler according to claim 1, characterized in that, The detection component is a magnetic ring or a photoelectric sensor.

7. A multi-channel automated sample introduction method, used in the multi-channel automated sample introduction device as described in any one of claims 1 to 6, characterized in that, Includes the following steps: S1: The control unit acquires the target injection volume and gas pump power parameters; S2: Start the target injection unit sequentially according to the preset order and perform cyclic injection. During the injection process, calculate the cumulative injection volume based on the flow integral algorithm and automatically adjust the gas pump power. S3: Based on the compensation algorithm, the cumulative injection volume is compensated according to the air bag pressure to obtain the effective injection volume. When the effective injection volume is greater than or equal to the target injection volume, the injection is stopped.

8. The multi-channel automated sample introduction method according to claim 7, characterized in that, When the multi-channel automatic sampler is equipped with a gas washing unit, the method further includes step S4: after the sample injection is completed, all target sample injection units are cleaned.

9. The multi-channel automated sample introduction method according to claim 7, characterized in that, In step S2, the control unit collects the gas flow rate and pressure in the injection path in real time; The flow integral algorithm performs integral calculations based on the sampling period and the gas flow rate to obtain the cumulative injection volume, and calculates the volume error based on the ratio of the pressure to the preset pressure. Based on the volume error, a PID controller is used to adjust the gas pump power.

10. The multi-channel automated sample introduction method according to claim 7, characterized in that, In step S3, The control unit acquires the airbag compliance parameters and calculates the pressure decay rate; The compensation algorithm calculates the air bag inflation volume and leakage volume based on the air bag pressure, air bag compliance parameters, and pressure decay rate, using these parameters. The effective injection volume is then used for inflation and leakage compensation. ,in, To accumulate the injection volume, This refers to the volume of the inflated airbag. For the leakage volume, The sampling time.

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