Digitized signal deviation rectifying device for gas chromatographic detector

Abstract

The utility model relates to a gas chromatography detector, in particular to a digital signal deviation rectifying device for the gas chromatography detector, which comprises a display module, a microcontroller, a driving module and a detector, the display module is embedded into a screen or a computer by an instrument, the output end of the display module is electrically connected with the input end of the microcontroller, and the output end of the microcontroller is electrically connected with the driving module. The output end of the microcontroller is electrically connected with the input end of the driving module, the output end of the driving module is electrically connected with the input end of the detector, the microcontroller is adopted to drive the motor, digital control is utilized, the signal rectification function of the gas chromatography detector is achieved, and an initial output signal can be kept at a calibration position or zero point. The implementation method is simple, a traditional mechanical operation method is replaced, and multi-path adjustment can be achieved at the same time; remote regulation and control can be achieved, and inconvenience caused by close-range operation is avoided; in combination with signal acquisition of a detector, automatic deviation correction and zero setting of signals can be realized, so that the instrument precision and the automation degree are improved.

Description

Technical Field

[0001] The utility model relates to a gas chromatographic detector, in particular to a digital signal deviation correction device used for the gas chromatographic detector. Background Art

[0002] In a gas chromatograph, the detector can convert the information of the substance flowing out of the chromatographic column into an electrical signal through a sensor for identification, thereby achieving qualitative or quantitative analysis of the substance to be tested. The sensor used in the chromatographic instrument may be affected by the ambient temperature and humidity, or drift during long-term operation, and an offset correction operation is required before collecting the signal. Traditional correction methods mostly use mechanical potentiometers, but there are problems such as large adjustment errors and long time consumption.

[0003] Signal deflection can eliminate errors and offsets in the circuit. For example, it can stabilize the output signal of the device at zero or calibrated signal value when there is no input signal. In addition, it can eliminate interference factors that cause signal offset, which can improve the sensitivity and dynamic detection range of the instrument system. By comparing the input signal with the zero signal, the signal deflection device can convert the change of the input signal into the change of the output signal, so that the system can detect small changes in the input signal.

[0004] There are many ways to implement signal correction, mainly divided into automatic correction and manual correction. Automatic correction is to achieve offset correction through the feedback mechanism inside the circuit, automatically detect and correct errors or offsets, so that the output signal remains at the calibrated position or zero point; manual zeroing refers to the process achieved through manual intervention. The instrument user needs to adjust the circuit parameters according to the instrument measurement results or operation instructions to return the output signal to its original position. Both methods are generally implemented through analog devices, and the correction must be performed close to the instrument. Utility Model Content

[0005] The main purpose of the utility model is to provide a digital signal correction device for a gas chromatograph detector, so as to solve the problem that automatic correction and manual zeroing need to be realized through analog devices and correction needs to be performed close to the instrument.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a digital signal correction device for a gas chromatography detector is provided, including a display module, a microcontroller, a drive module and a detector. The display module is embedded in the instrument screen or the computer in two ways. The output end of the display module is electrically connected to the input end of the microcontroller, the output end of the microcontroller is electrically connected to the input end of the drive module, and the output end of the drive template is electrically connected to the input end of the detector.

[0007] Further, the driving module includes a driving chip, a motor potentiometer, and a current-limiting resistor, and the driving module is set in three groups.

[0008] Further, a positive level signal and a negative level signal are fixedly installed on the surface of the driving chip, and the output ends of the microcontroller are electrically connected to the positive level signal input end and the negative level signal input end of the driving chip respectively.

[0009] Further, there are three groups of the driving chips and the motor potentiometers, and the output ends of the three groups of driving chips are electrically connected to the input ends of the three groups of motor potentiometers respectively.

[0010] Further, current-limiting resistors are arranged on both sides of each group of motor potentiometers, and the output ends of each group of motor potentiometers are electrically connected to the input ends of the two groups of current-limiting resistors respectively.

[0011] Further, the output end of the motor potentiometer is electrically connected to the input end of the detector, and the output end of the current-limiting resistor is electrically connected to the input end of the detector.

[0012] Compared with the prior art, the present utility model has the following beneficial effects:

[0013] 1. This device is composed of a display module, a microcontroller, and a driving module. Based on the microcontroller, combined with a variety of electronic components, a circuit diagram is designed to achieve digital control, which is convenient and fast and improves the accuracy.

[0014] 2. This device uses a microcontroller to drive the motor, and uses digital control to achieve the signal correction function of the gas chromatograph detector, so that the initial output signal can be kept at the calibration position or zero point. The implementation method is simple, replacing the traditional mechanical operation method, and can adjust multiple channels simultaneously; it can also be remotely controlled to avoid the inconvenience of close-range operation; combined with the detector signal acquisition, it can achieve automatic signal correction and zero adjustment, thereby improving the instrument accuracy and automation level. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the circuit structure of the present utility model;

[0016] Illustration: 1. Display module; 2. Microcontroller; 3. Driving chip; 4. Motor potentiometer; 5. Current-limiting resistor; 6. Detector. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] To further elaborate on the technical means and effects adopted by the present utility model to achieve the predetermined utility model purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation manners, structures, features, and their effects of the present utility model as follows.

[0018] Please refer to Figure 1 to 1, for an embodiment of the present utility model, a digital signal deviation correction device for a gas chromatography detector, comprising a display module 1, a microcontroller 2, a driving module and a detector 6. The display module 1 can be implemented in two ways: an instrument-embedded screen or a computer. The display module 1 is connected to the control main board and can display and operate on the screen to show the signal amount output by the current detector 6. The operations include coarse adjustment and fine adjustment, forward coarse adjustment, reverse coarse adjustment, forward fine adjustment, and reverse fine adjustment, which are used to adjust the magnitude of the output signal amount. The output end of the display module 1 is electrically connected to the input end of the microcontroller 2. The model of the microcontroller 2 is STM32, which is connected to the display module 1 and the multi-channel driving module. It receives operation commands from the human-machine interface, parses them and drives the corresponding driving module. The output end of the microcontroller 2 is electrically connected to the input end of the driving module, and the output end of the driving template is electrically connected to the input end of the detector 6. The driving template mainly includes a driving chip 3, a motor potentiometer 4 and a current-limiting resistor 5.

[0019] Specifically, the driving module includes a driving chip 3, a motor potentiometer 4 and a current-limiting resistor 5, and three groups of driving modules are provided.

[0020] In the embodiment of the present utility model, the model of the driving chip 3 is L9110S, and the three groups of driving modules can be connected in parallel.

[0021] Specifically, a positive level signal and a negative level signal are fixedly installed on the surface of the driving chip 3, and the output end of the microcontroller 2 is electrically connected to the positive level signal input end and the negative level signal input end of the driving chip 3 respectively.

[0022] In the embodiment of the present utility model, by connecting the positive level signal and the negative level signal, the forward and reverse adjustment of the signal is realized. When the signal value needs to be increased, forward adjustment is used, and when the signal value needs to be decreased, reverse adjustment is used.

[0023] Specifically, both the driving chip 3 and the motor potentiometer 4 are provided with three groups, and the output ends of the three groups of driving chips 3 are electrically connected to the input ends of the three groups of motor potentiometers 4 respectively.

[0024] In the embodiment of the present utility model, the microcontroller 2 configures the level forward and reverse signals of the driving chip 3 according to the coarse adjustment and fine adjustment commands and the driving number, and drives the motor potentiometer 4.

[0025] Specifically, a current-limiting resistor 5 is provided on both sides of each group of motor potentiometers 4, and the output end of each group of motor potentiometers 4 is electrically connected to the input ends of the two groups of current-limiting resistors 5 respectively.

[0026] In the embodiment of the present utility model, the current-limiting resistor 5 is used to limit the output current from exceeding the maximum value to prevent errors.

[0027] Specifically, the output end of the motor potentiometer 4 is electrically connected to the input end of the detector 6, and the output end of the current-limiting resistor 5 is electrically connected to the input end of the detector 6.

[0028] In the embodiment of the present utility model, the motor potentiometer 4 realizes the homing of the signal of the detector 6, and the current-limiting resistor 5 is used to limit the current.

[0029] During use, by operating the coarse adjustment and fine adjustment commands on the display module 1, they are sent to the microcontroller 2, and the microcontroller 2 processes them according to coarse adjustment forward, coarse adjustment reverse, fine adjustment forward, and fine adjustment reverse. Configure the level direction of the driver chip 3, set the timer, and turn on the level signal to drive the motor potentiometer 4 to realize the homing of the signal of the detector 6. The current-limiting resistor 5 is used to limit the output current from exceeding the maximum value to prevent errors.

[0030] The above are only the preferred embodiments of the present utility model and do not impose any form of limitation on the present utility model. Although the present utility model has been disclosed above with the preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to form equivalent embodiments with equivalent changes, but as long as the technical content of the present utility model is not departed from, any brief modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims

1. A digital signal correction device for a gas chromatograph detector, comprising a display module (1), a microcontroller (2), a driving module and a detector (6), characterized in that, The display module (1) is implemented in two ways: instrument-embedded screen or computer. The output end of the display module (1) is electrically connected to the input end of the microcontroller (2). The output end of the microcontroller (2) is electrically connected to the input end of the driving module. The output end of the driving template is electrically connected to the input end of the detector (6).

2. The digital signal deviation correction device for a gas chromatography detector according to claim 1, wherein, The driving module includes a driving chip (3), a motor potentiometer (4), and a current-limiting resistor (5). The driving module is set in three groups.

3. The digital signal deviation correction device for a gas chromatography detector according to claim 2, characterized in that, The surface of the driving chip (3) is fixedly installed with a positive level signal and a negative level signal. The output end of the microcontroller (2) is electrically connected to the positive level signal input end and the negative level signal input end of the driving chip (3) respectively.

4. A digital signal deviation correction device for a gas chromatography detector according to claim 1, wherein Both the driving chip (3) and the motor potentiometer (4) are set in three groups. The output ends of the three groups of driving chips (3) are all electrically connected to the input ends of the three groups of motor potentiometers (4).

5. A digital signal correction device for a gas chromatograph detector according to claim 2, characterized in that, A current-limiting resistor (5) is arranged on both sides of each group of motor potentiometers (4). The output end of each group of motor potentiometers (4) is electrically connected to the input ends of the two groups of current-limiting resistors (5) respectively.

6. The digital signal correction device for a gas chromatograph detector according to claim 2, characterized in that, The output end of the motor potentiometer (4) is electrically connected to the input end of the detector (6). The output end of the current-limiting resistor (5) is electrically connected to the input end of the detector (6).

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