Calibration equipment of sensor

Abstract

The utility model relates to the technical field of sensor detection, and discloses a calibration device of a sensor, which comprises a calibration box, the sensor is arranged in the calibration box, and the sensor is connected with a controller through a data receiving and transmitting module; the mixing cavity is communicated with the calibration box; the mass flow meters are respectively communicated with the interior of the mixing cavity, and the different mass flow meters are respectively connected with standard liquid; and the temperature control module is electrically connected to the controller and is located in the calibration box. Wherein the temperature control module can be used for detecting, regulating and controlling the temperature of liquid in the calibration box. According to the technical scheme provided by the utility model, the technical problems of errors, low manual liquid preparation efficiency and poor accuracy caused by manual liquid preparation in calibration before delivery of the sensor at present can be effectively solved, the production efficiency and the calibration accuracy can be improved, and the production cost can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sensor detection, in particular to a sensor calibration device. Background Art

[0002] In the sensor manufacturing industry, sensor calibration is a critical step in ensuring accurate and reliable sensor performance. Sensors typically require calibration before shipment. The purpose of sensor calibration is to establish a precise relationship between the sensor's output signal and input quantities (such as temperature, pressure, and flow), enabling accurate measurement and monitoring of various physical quantities in real-world applications. However, traditional sensor calibration methods have drawbacks. Manual solution preparation is prone to errors and inefficient, and calibration data can be erroneous under different environments. For example, even slight changes in environmental factors such as temperature, humidity, and air pressure can affect sensor performance, leading to inaccurate calibration results. Furthermore, the accuracy of the standard solution ratio during the calibration process directly impacts the accuracy of the calibration results. Traditional calibration methods often struggle to precisely control the standard solution ratio, especially when mixing multi-component standard solutions. Accumulated errors can cause the calibration results to deviate from the true value. Precisely controlling the standard solution ratio during the calibration process can also lead to poor calibration accuracy. Utility Model Content

[0003] The main purpose of the utility model is to propose a sensor calibration device, which aims to at least solve the technical problems in the related art that, in the current sensor calibration before leaving the factory, manual liquid preparation brings errors, manual liquid preparation is inefficient, and environmental factors may affect the performance of the sensor, resulting in inaccurate calibration results, and it is difficult to accurately control the ratio of standard liquid during the calibration process, resulting in poor calibration accuracy.

[0004] To achieve the above objectives, the present invention provides a sensor calibration device, which includes:

[0005] a calibration box, wherein the sensor is located in the calibration box, and the sensor is connected to a controller via a data transceiver module;

[0006] A mixing chamber, connected to the calibration box;

[0007] a plurality of mass flow meters, each of which is connected to the mixing chamber, and each of which is connected to a standard liquid; and

[0008] a temperature control module, which is electrically connected to the controller and located in the calibration box;

[0009] The temperature control module can be used to detect and regulate the temperature of the liquid in the calibration box.

[0010] In one embodiment, the bottom of the calibration box can be connected to a waste liquid collection box, and a control valve is provided between the waste liquid collection box and the calibration box.

[0011] In one embodiment, the standard liquid connected to at least one of the mass flow meters is pure water.

[0012] In one embodiment, a pump body and a valve are provided in the standard liquid, the valve can be used to regulate the on-off between the mass flow meter and the standard liquid, and the pump body can be used to pump the standard liquid into the mixing chamber;

[0013] Wherein, the valve and the pump body are controllably connected to the controller respectively.

[0014] In one embodiment, a liquid level sensor is further included. The liquid level sensor is located in the calibration box, and the liquid level sensor is electrically connected to the controller.

[0015] In one embodiment, a verification unit is further included, and the verification unit is electrically connected to the controller;

[0016] The verification unit may be used to read the measured value of the sensor, compare it with the known value of the system, and calculate whether the relative error meets the preset standard.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The utility model discloses a sensor calibration device that uses multiple mass flowmeters to achieve precise proportioning of standard liquids, avoiding the error accumulation caused by inaccurate proportioning of standard liquids in traditional calibration methods. At the same time, the temperature control module can detect and regulate the liquid temperature in the calibration box, ensuring the stability of the calibration environment temperature and further improving the calibration accuracy. The entire calibration process is automatically controlled by a controller, including the proportioning, mixing, transportation and temperature control of the standard liquid, which greatly reduces manual intervention and improves the automation and efficiency of the calibration. After the liquid preparation process is completed, the current standard liquid is cooled to a preset temperature point for constant temperature. Then, the system begins to collect the response data of each sensor through the data transceiver module and stores it in a database. By analyzing the database left during the calibration process, the calibration concentration points can be scientifically reduced, the calibration plan can be optimized, and the cost can be reduced. Due to the use of automated control and precise temperature and liquid level control, the calibration process is faster and more accurate, greatly improving the calibration efficiency. It can effectively improve the current technical problems in the calibration of sensors before leaving the factory, such as errors caused by manual liquid preparation, low efficiency of manual liquid preparation, and the influence of environmental factors that may affect the performance of the sensor, resulting in inaccurate calibration results. It is also difficult to accurately control the ratio of standard liquid during the calibration process, resulting in poor calibration accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0020] Figure 1 The present invention provides a sensor calibration device according to an embodiment of the present invention.

[0021] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0023] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0024] Referring to Figure 1 , the present invention discloses a sensor calibration device designed to at least address the technical issue of poor accuracy in current pre-factory sensor calibration. Specifically, the sensor calibration device disclosed in the present invention includes a calibration box, a mixing chamber, multiple mass flow meters, and a temperature control module.

[0025] The sensor used for calibration is located in the calibration box and is connected to a controller via a data transceiver module. During the calibration process, the sensor generates relevant data that can be transmitted to the controller through the data transceiver module. The controller calibrates the sensor based on this data.

[0026] Furthermore, during the actual calibration process, a calibration box is usually provided with a preset relevant liquid for calibrating the sensor. The mixing box is connected to the calibration box, and the relevant liquid enters the calibration box after passing through the mixing chamber.

[0027] It is understood that multiple mass flow meters are connected to the mixing box, and different mass flow meters are connected to different standard liquids. It should be noted that, among the multiple mass flow meters, at least one mass flow meter is connected to a standard liquid of pure water, and the remaining mass flow meters are connected to different types of standard liquids.

[0028] Therefore, in the actual calibration process, different standard liquids can be proportioned and mixed in the mixing chamber before entering the calibration box.

[0029] Furthermore, a pump and a valve are disposed within the standard liquid. The valve can be used to connect and disconnect the standard liquid to the mass flowmeter, and the pump can be used to pump the standard liquid into the mixing chamber. It will be appreciated that the valve and pump are each controllably connected to a controller, allowing the controller to regulate the operating states of the pump and valve.

[0030] Specifically, the system can automatically configure the standard solution according to a pre-set automation plan. The control circuit opens the valve corresponding to the standard solution waterway. The pump body pumps the standard solution into the mixing chamber for solution mixing. At the same time, the mass flow meter controls the flow rate of the standard solution to quantitatively configure the solution.

[0031] In certain embodiments, to enhance the performance of this device during actual use, a waste liquid collection tank may be connected to the bottom of the calibration tank, with a control valve positioned between the waste liquid collection tank and the calibration tank. As will be appreciated, the control valve is connected to a controller, which controls its state. Therefore, after the sensor is calibrated, the control valve can be opened to drain waste liquid from the calibration tank into the waste liquid collection tank.

[0032] Since pure water is provided in multiple standard solutions, it is convenient to open the control valve of the pure water channel to clean the water channel and the calibration box. After cleaning, the automatic configuration process of the next standard solution or the next sensor model deployment can be continued.

[0033] To improve the performance of this device during actual use, a temperature control module is electrically connected to the controller and located within the calibration chamber. The temperature control module can be used to detect and control the temperature of the liquid within the calibration chamber. Because sensors are easily affected by temperature during the monitoring process, resulting in inaccurate measurements, temperature calibration is necessary. After the liquid preparation process is complete, the system uses the temperature control module to cool the current standard liquid to a preset temperature point for constant temperature. The system then begins collecting response data from each sensor through the data transceiver module and storing it in a database. It then begins heating to the next temperature point, maintaining constant temperature, and collecting data.

[0034] Specifically, in certain embodiments, the temperature control module may include a heating unit and a temperature measuring unit, each of which is electrically connected to a controller. The controller may control the operating state of the heating unit based on temperature data obtained by the temperature measuring unit. The specific structure of the heating unit may be determined based on actual needs, such as, for example, a heating wire. However, this is not limiting and may be determined based on actual needs.

[0035] Furthermore, a liquid level sensor is provided within the calibration tank. This sensor is located within the calibration tank and is electrically connected to the controller. The sensor senses the liquid content within the calibration tank and helps prevent excess liquid from entering the tank.

[0036] In some embodiments, the controller is electrically connected to a verification unit that can be used to read the sensor's measurement value, compare it with a known value of the system, and calculate whether the relative error meets a preset standard.

[0037] Specifically, a verification unit is added to the sensor verification process. A controller automates the process, randomly configuring concentration points of non-calibrated standard solutions or mixed standard solutions. The system then controls the temperature at different points and compares the sensor's measured value with the system's known value to calculate the relative error and confirm whether the data meets the standard and is stable over a period of time.

[0038] During sensor calibration, the more concentration points you calibrate, the higher the sensor's accuracy. Therefore, by analyzing the database left over from the calibration process, you can scientifically reduce the number of concentration points you calibrate, optimize the calibration plan, and reduce costs.

[0039] In summary, the present invention discloses a sensor calibration device that uses multiple mass flowmeters to precisely mix standard liquids, avoiding the accumulated errors caused by inaccurate standard liquid mixing in traditional calibration methods. Furthermore, a temperature control module detects and regulates the liquid temperature within the calibration chamber, ensuring a stable calibration environment and further improving calibration accuracy. The entire calibration process, including the mixing, mixing, and delivery of the standard liquids, as well as temperature control, is automated by a controller, significantly reducing manual intervention and improving the automation and efficiency of calibration. After the liquid mixing process is completed, the current standard liquid is cooled to a preset temperature point for constant temperature. The system then begins collecting response data from each sensor through a data transceiver module and storing it in a database. By analyzing the database data collected during the calibration process, the number of calibration concentration points can be scientifically reduced, the calibration scheme can be optimized, and costs can be reduced. The use of automated control and precise temperature and liquid level control makes the calibration process faster and more accurate, significantly improving calibration efficiency. This effectively addresses the current technical issue of poor accuracy in pre-shipment sensor calibration.

[0040] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A sensor calibration device, characterized in that: include: a calibration box, wherein the sensor is located in the calibration box, and the sensor is connected to a controller via a data transceiver module; A mixing chamber, connected to the calibration box; a plurality of mass flow meters, each of which is connected to the mixing chamber, and each of which is connected to a standard liquid; as well as a temperature control module, which is electrically connected to the controller and located in the calibration box; The temperature control module can be used to detect and regulate the temperature of the liquid in the calibration box.

2. The sensor calibration device according to claim 1, characterized in that: The bottom of the calibration box can be connected to a waste liquid collection box, and a control valve is provided between the waste liquid collection box and the calibration box.

3. The sensor calibration device according to claim 1, characterized in that: The standard liquid connected to at least one of the mass flow meters is pure water.

4. The sensor calibration device according to claim 1, characterized in that: A pump body and a valve are provided in the standard liquid, the valve can be used to regulate the connection between the mass flow meter and the standard liquid, and the pump body can be used to draw the standard liquid into the mixing chamber; Wherein, the valve and the pump body are controllably connected to the controller respectively.

5. The sensor calibration device according to claim 1, characterized in that: It also includes a liquid level sensor, which is located in the calibration box and is electrically connected to the controller.

6. The sensor calibration device according to claim 1, characterized in that: Also included is a verification unit, the verification unit being electrically connected to the controller; The verification unit may be used to read the measured value of the sensor, compare it with the known value of the system, and calculate whether the relative error meets the preset standard.

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