Multi-concentration point gas sensor automatic calibration
By setting up an electronically controlled ball valve and an electronically controlled three-way ball valve in the gas sensor, combined with a PC control system, the calibration error problem caused by flowmeter drift and leakage is solved, and higher accuracy and reliability are achieved.
Patent Information
- Application Number
- CN202421494498.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-27
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-06-27
AI Technical Summary
In the calibration experiment of gas sensors, leakage of flowmeter and zero-point drift lead to an increase in calibration error, especially when calibration of low-concentration gases, leakage of high-concentration gases affects sensor accuracy, and gas residue leads to zero-point drift.
By setting up an electronically controlled ball valve, an electronically controlled three-way ball valve, a standard gas pipe, a nitrogen pipe, a flowmeter and a PC control system, the flowmeter drift and leakage control control is achieved to ensure that the gas does not diffuse to the rear end, and the residual gas is cleaned after ventilation is completed.
It effectively reduces calibration errors, improves the accuracy and reliability of the gas sensor, and ensures the accuracy of the flowmeter and the cleanliness of the gas.
Smart Images
Figure CN223037895U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of gas sensors, and more specifically, to the automatic calibration of gas sensors at multiple concentration points. Background Technique
[0002] A gas sensor is a converter that converts the volume fraction of a certain gas into a corresponding electrical signal. The detection head conditions the gas sample through the gas sensor, usually including filtering out impurities and interfering gases, and drying or refrigerating the instrument display part.
[0003] Currently, when conducting a calibration experiment on a gas sensor, different concentrations of standards need to be introduced. When introducing these standard gases, a flowmeter is required to control the gas flow rate and on-off. However, when the flowmeter is in the closed state, its solenoid valve cannot completely cut off the gas flow. Therefore, the standard gas leaks into the sensor along the channel of the flowmeter, resulting in a relatively large error in the calibration experiment. Especially when calibrating low-concentration gases, the leakage of high-concentration gases will seriously affect the accuracy of the sensor. Secondly, the flowmeter will experience zero drift due to factors such as temperature change and operating time. When the drift is too large, it is equivalent to the flowmeter opening at a weak flow rate, and the standard gas can still leak into the sensor along the channel of the flowmeter, resulting in a relatively large error in the calibration experiment. Finally, the pipelines connecting each flowmeter are relatively long, and the gas in the pipelines is not easily discharged, resulting in gas residue. These residual gases will also diffuse into the sensor along the pipelines. When the concentration of the standard gas is high, it will seriously affect the zero point of the sensor, resulting in an increase in the error of the calibration experiment. Content of the Utility Model
[0004] Aiming at the problems existing in the prior art, the purpose of the utility model is to provide an automatic calibration of a gas sensor at multiple concentration points. By setting an electric control ball valve, an electric control three-way ball valve, a calibration gas pipe, a nitrogen gas pipe, a flowmeter, and a PC control system, even if the flowmeter has drift and leakage, the gas will not diffuse backward. And when introducing the standard gas, other standard gas inlets are closed and will not affect the sensor. After the ventilation is completed, opening the nitrogen electric control ball valve and the flowmeter, and switching all the electric control three-way valves to the upper gas inlet can clean the residual gas generated during the previous ventilation.
[0005] To solve the above problems, the utility model adopts the following technical solutions.
[0006] Automatic calibration of gas sensors with multiple concentration points, including a gas sensor body, a PC control system, a nitrogen gas cylinder, a first calibration gas cylinder, a second calibration gas cylinder, a third calibration gas cylinder, a fourth calibration gas cylinder, a fifth calibration gas cylinder, a sixth calibration gas cylinder, a seventh calibration gas cylinder, and an eighth calibration gas cylinder. The PC control system is provided with connecting wires. One end of each of the nitrogen gas cylinder, the first calibration gas cylinder, the second calibration gas cylinder, the third calibration gas cylinder, the fourth calibration gas cylinder, the fifth calibration gas cylinder, the sixth calibration gas cylinder, the seventh calibration gas cylinder, and the eighth calibration gas cylinder is provided with a connecting pipe, and one end of each connecting pipe is fixedly installed with an electric control ball valve, a first electric control three-way ball valve, a second electric control three-way ball valve, a third electric control three-way ball valve, a fourth electric control three-way ball valve, a fifth electric control three-way ball valve, a sixth electric control three-way ball valve, a seventh electric control three-way ball valve, and an eighth electric control three-way ball valve. One end of the electric control ball valve, the first electric control three-way ball valve, the second electric control three-way ball valve, the third electric control three-way ball valve, the fourth electric control three-way ball valve, the fifth electric control three-way ball valve, the sixth electric control three-way ball valve, the seventh electric control three-way ball valve, and the eighth electric control three-way ball valve is fixedly connected to a nitrogen gas pipe. One end of the first electric control three-way ball valve, the second electric control three-way ball valve, the third electric control three-way ball valve, the fourth electric control three-way ball valve, the fifth electric control three-way ball valve, the sixth electric control three-way ball valve, the seventh electric control three-way ball valve, and the eighth electric control three-way ball valve is respectively fixedly connected to a first calibration gas pipe, a second calibration gas pipe, a third calibration gas pipe, a fourth calibration gas pipe, a fifth calibration gas pipe, a sixth calibration gas pipe, a seventh calibration gas pipe, and an eighth calibration gas pipe. The surfaces of the first calibration gas pipe, the second calibration gas pipe, the third calibration gas pipe, the fourth calibration gas pipe, the fifth calibration gas pipe, the sixth calibration gas pipe, the seventh calibration gas pipe, and the eighth calibration gas pipe are respectively provided with a first flow meter, a second flow meter, a third flow meter, a fourth flow meter, a fifth flow meter, a sixth flow meter, a seventh flow meter, and an eighth flow meter. By setting the electric control ball valve, the electric control three-way ball valve, the calibration gas pipe, the nitrogen gas pipe, the flow meter, and the PC control system, even if the flow meter drifts and leaks, the gas will not diffuse backward. And when introducing the standard gas, the other standard gas inlets are closed and will not affect the sensor. And after the ventilation is over, opening the nitrogen gas electric control ball valve and the flow meter and switching all the electric control three-way valves to the upper gas inlet can clean the residual gas generated during the previous ventilation.
[0007] Further, the electric control ball valve, the first electric control three-way ball valve, the second electric control three-way ball valve, the third electric control three-way ball valve, the fourth electric control three-way ball valve, the fifth electric control three-way ball valve, the sixth electric control three-way ball valve, the seventh electric control three-way ball valve, and the eighth electric control three-way ball valve are electrically connected to the PC control system through connecting wires, and the opening and closing of each ball valve can be automatically controlled through the PC control system.
[0008] Further, the first flow meter, the second flow meter, the third flow meter, the fourth flow meter, the fifth flow meter, the sixth flow meter, the seventh flow meter, and the eighth flow meter are electrically connected to the PC control system through connecting wires, and the operation of each flow meter can be automatically controlled through the PC control system.
[0009] Further, one end of the first standard gas pipe, the second standard gas pipe, the third standard gas pipe, the fourth standard gas pipe, the fifth standard gas pipe, the sixth standard gas pipe, the seventh standard gas pipe and the eighth standard gas pipe is connected to the gas sensor body, facilitating the detection of each standard gas.
[0010] Further, a plurality of connecting pipes are arranged on the surface of the nitrogen gas pipe. The number of the connecting pipes is the same as the number of the standard gas cylinders, and the number of the standard gas cylinders is the same as the number of the flow meters and the standard gas pipes.
[0011] Further, the connecting pipes are connected to the upper air inlets of the respective electric control three-way ball valves, and the connecting pipes are connected to the lower air inlets of the respective electric control three-way ball valves.
[0012] Further, the gas sensor body is provided with an air inlet end and an air outlet end, facilitating the inlet and outlet of the standard gas.
[0013] Compared with the prior art, the advantages of the present utility model are as follows:
[0014] (1) Switch all the electric control three-way ball valves to the upper air inlets, all the standard gas outlets are closed, and all the flow meters are connected to the nitrogen gas pipeline. At this time, close the nitrogen gas electric control ball valve, and the air inlets of all the flow meters are closed. Because the gas source is closed, even if the flow meters have drift and leakage, the gas will not diffuse backward.
[0015] (2) When it is necessary to introduce the standard gas, just switch the corresponding electric control three-way ball valve to the lower air inlet, and the standard gas can be connected to the corresponding flow meter. Open the flow meter, and the standard gas will enter the sensor. The other electric control three-way ball valves are switched to the upper air inlets, so the other standard gas inlets are closed and will not affect the sensor.
[0016] (3) After the ventilation is completed, open the nitrogen gas electric control ball valve, open the flow meter, and switch all the electric controls to the upper air inlets, which can clean the residual gas generated during the previous ventilation. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the overall structure of the present utility model.
[0018] Explanation of the reference numerals in the figure:
[0019] 1 nitrogen gas cylinder, 11 electric control ball valve, 12 connecting pipe, 13 nitrogen gas pipe, 14 connecting pipe, 2 first standard gas cylinder, 21 first electric control three-way ball valve, 22 first standard gas pipe, 23 first flowmeter, 3 second standard gas cylinder, 31 second electric control three-way ball valve, 32 second standard gas pipe, 33 second flowmeter, 4 third standard gas cylinder, 41 third electric control three-way ball valve, 42 third standard gas pipe, 43 third flowmeter, 5 fourth standard gas cylinder, 51 fourth electric control three-way ball valve, 52 fourth standard gas pipe, 53 fourth flowmeter, 6 fifth standard gas cylinder, 61 fifth electric control three-way ball valve, 62 fifth standard gas pipe, 63 fifth flowmeter, 7 sixth standard gas cylinder, 71 sixth electric control three-way ball valve, 72 sixth standard gas pipe, 73 sixth flowmeter, 8 seventh standard gas cylinder, 81 seventh electric control three-way ball valve, 82 seventh standard gas pipe, 83 seventh flowmeter, 9 eighth standard gas cylinder, 91 eighth electric control three-way ball valve, 92 eighth standard gas pipe, 93 eighth flowmeter, 100 gas sensor body, 101 intake end, 102 outlet end, 200 PC control system, 201 connecting wire. Detailed implementation manners
[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
[0021] Embodiment 1
[0022] Please refer to Figure 1, Automatic calibration of gas sensors at multiple concentration points, including a gas sensor body 100, a PC control system 200, a nitrogen gas cylinder 1, a first calibration gas cylinder 2, a second calibration gas cylinder 3, a third calibration gas cylinder 4, a fourth calibration gas cylinder 5, a fifth calibration gas cylinder 6, a sixth calibration gas cylinder 7, a seventh calibration gas cylinder 8, and an eighth calibration gas cylinder 9. The PC control system 200 is provided with a connecting wire 201. The nitrogen gas cylinder is connected to an electric control ball valve, and the upper end of the ball valve is connected to the upper end air inlet of each electric control three-way ball valve, and the lower end is connected to the nitrogen gas cylinder; the calibration gas cylinder is connected to an electric control three-way ball valve, the lower end air inlet of the ball valve is connected to the standard gas cylinder, the upper end air inlet is connected to nitrogen gas, and the right end air outlet is connected to a flow meter; the wiring terminals of each electric control three-way ball valve are connected to the PC control system 200; the wiring terminals of each flow meter are connected to the PC control system 200. One end of the nitrogen gas cylinder 1, the first calibration gas cylinder 2, the second calibration gas cylinder 3, the third calibration gas cylinder 4, the fourth calibration gas cylinder 5, the fifth calibration gas cylinder 6, the sixth calibration gas cylinder 7, the seventh calibration gas cylinder 8, and the eighth calibration gas cylinder 9 is provided with a communicating pipe 12, and one end of each communicating pipe 12 is respectively fixedly installed with an electric control ball valve 11, a first electric control three-way ball valve 21, a second electric control three-way ball valve 31, a third electric control three-way ball valve 41, a fourth electric control three-way ball valve 51, a fifth electric control three-way ball valve 61, a sixth electric control three-way ball valve 71, a seventh electric control three-way ball valve 81, and an eighth electric control three-way ball valve 91. One end of the electric control ball valve 11, the first electric control three-way ball valve 21, the second electric control three-way ball valve 31, the third electric control three-way ball valve 41, the fourth electric control three-way ball valve 51, the fifth electric control three-way ball valve 61, the sixth electric control three-way ball valve 71, the seventh electric control three-way ball valve 81, and the eighth electric control three-way ball valve 91 is fixedly connected with a nitrogen gas pipe 13. One end of the first electric control three-way ball valve 21, the second electric control three-way ball valve 31, the third electric control three-way ball valve 41, the fourth electric control three-way ball valve 51, the fifth electric control three-way ball valve 61, the sixth electric control three-way ball valve 71, the seventh electric control three-way ball valve 81, and the eighth electric control three-way ball valve 91 is respectively fixedly connected with a first calibration gas pipe 22, a second calibration gas pipe 32, a third calibration gas pipe 42, a fourth calibration gas pipe 52, a fifth calibration gas pipe 62, a sixth calibration gas pipe 72, a seventh calibration gas pipe 82, and an eighth calibration gas pipe 92. The surfaces of the first calibration gas pipe 22, the second calibration gas pipe 32, the third calibration gas pipe 42, the fourth calibration gas pipe 52, the fifth calibration gas pipe 62, the sixth calibration gas pipe 72, the seventh calibration gas pipe 82, and the eighth calibration gas pipe 92 are respectively provided with a first flow meter 23, a second flow meter 33, a third flow meter 43, a fourth flow meter 53, a fifth flow meter 63, a sixth flow meter 73, a seventh flow meter 83, and an eighth flow meter 93.
[0023] The electric control ball valves 11, the first electric control three-way ball valve 21, the second electric control three-way ball valve 31, the third electric control three-way ball valve 41, the fourth electric control three-way ball valve 51, the fifth electric control three-way ball valve 61, the sixth electric control three-way ball valve 71, the seventh electric control three-way ball valve 81 and the eighth electric control three-way ball valve 91 are electrically connected to the PC control system 200 through the connection line 201. Through the PC control system 200, the opening and closing of each ball valve can be automatically controlled. The first flowmeter 23, the second flowmeter 33, the third flowmeter 43, the fourth flowmeter 53, the fifth flowmeter 63, the sixth flowmeter 73, the seventh flowmeter 83 and the eighth flowmeter 93 are electrically connected to the PC control system 200 through the connection line 201. Through the PC control system 200, the operation of each flowmeter can be automatically controlled.
[0024] One ends of the first calibration gas pipe 22, the second calibration gas pipe 32, the third calibration gas pipe 42, the fourth calibration gas pipe 52, the fifth calibration gas pipe 62, the sixth calibration gas pipe 72, the seventh calibration gas pipe 82 and the eighth calibration gas pipe 92 are communicated with the gas sensor body 100, which is convenient for detecting each calibration gas. A plurality of connecting pipes 14 are arranged on the surface of the nitrogen gas pipe 13. The number of the connecting pipes 14 is the same as the number of the calibration gas cylinders. The number of the calibration gas cylinders is the same as the number of the flowmeters and the calibration gas pipes. The connecting pipes 14 are communicated with the upper air inlets of each electric control three-way ball valve. The connecting pipe 12 is communicated with the lower air inlets of each electric control three-way ball valve. The gas sensor body 100 is provided with an air inlet end 101 and an air outlet end 102, which is convenient for the inlet and outlet of the calibration gas.
[0025] During the use of the multi-concentration point gas sensor automatic calibration, first, the lower air inlet of the first electric control three-way ball valve 21 of the first calibration gas cylinder 2 is opened through the PC, and the first calibration gas is connected to the first flowmeter 23. Then, the first flowmeter 23 for controlling the first calibration gas is opened through the PC. Next, the first calibration gas enters the gas sensor body 100 through the pipeline and the sensor data is processed. After the ventilation is over, the upper air inlet of the first electric control three-way ball valve 21 of the first calibration gas cylinder 2 is opened through the PC, and nitrogen gas is connected to the first flowmeter 23. Then, the electric control ball valve 11 of the nitrogen gas cylinder 1 is opened through the PC. The flowmeters are all connected with nitrogen gas. The PC opens all the flowmeters to clean the residues of the first calibration gas in all the pipelines. After the cleaning is over, the PC closes the electric control ball valve 11 of the nitrogen gas cylinder 1, and the PC closes all the flowmeters. When introducing other calibration gases, the above method can be used to detect different calibration gases. Through the set electric control ball valve 11, electric control three-way ball valve, calibration gas pipe, nitrogen gas pipe, flowmeter, and PC control system 200, even if the flowmeter drifts and leaks, the gas will not diffuse backward. And when introducing the standard gas, the other standard gas inlets are closed and will not affect the sensor. And after the ventilation is over, opening the nitrogen gas electric control ball valve 11 and opening the flowmeters, and switching all the electric control three-way valves to the upper air inlets can clean the residual gas generated during the previous ventilation.
[0026] The above are only the preferred specific embodiments of the present utility model; however, the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, making equivalent substitutions or changes according to the technical solution and its improved concept of the present utility model, shall be covered by the protection scope of the present utility model.
Claims
1. Automatic calibration of a gas sensor at multiple concentration points, comprising a gas sensor body (100), a PC control system (200), a nitrogen bottle (1), a first calibration gas bottle (2), a second calibration gas bottle (3), a third calibration gas bottle (4), a fourth calibration gas bottle (5), a fifth calibration gas bottle (6), a sixth calibration gas bottle (7), a seventh calibration gas bottle (8) and an eighth calibration gas bottle (9), wherein the PC control system (200) is provided with a connecting line (201), characterized in that: One end of the nitrogen cylinder (1), the first standard gas cylinder (2), the second standard gas cylinder (3), the third standard gas cylinder (4), the fourth standard gas cylinder (5), the fifth standard gas cylinder (6), the sixth standard gas cylinder (7), the seventh standard gas cylinder (8) and the eighth standard gas cylinder (9) are all provided with a connecting pipe (12), and one end of each connecting pipe (12) is respectively fixedly installed with an electric control ball valve (11), a first electric control three-way ball valve (21), a second electric control three-way ball valve (31), a third electric control three-way ball valve (41), a fourth electric control three-way ball valve (51), a fifth electric control three-way ball valve (52) and a The electric-controlled three-way ball valve (61), the sixth electric-controlled three-way ball valve (71), the seventh electric-controlled three-way ball valve (81) and the eighth electric-controlled three-way ball valve (91), one end of the electric-controlled ball valve (11), the first electric-controlled three-way ball valve (21), the second electric-controlled three-way ball valve (31), the third electric-controlled three-way ball valve (41), the fourth electric-controlled three-way ball valve (51), the fifth electric-controlled three-way ball valve (61), the sixth electric-controlled three-way ball valve (71), the seventh electric-controlled three-way ball valve (81) and the eighth electric-controlled three-way ball valve (91) are fixedly connected to a nitrogen pipe (13), and the first electric-controlled three-way ball valve (21), the second electric-controlled three-way ball valve (31), the third electric-controlled three-way ball valve (41), the fourth electric-controlled three-way ball valve (51), the fifth electric-controlled three-way ball valve (61), the sixth electric-controlled three-way ball valve (71), the seventh electric-controlled three-way ball valve (81) and the eighth electric-controlled three-way ball valve (91) are fixedly connected to one end of ... One end of the first electrically controlled three-way ball valve (21), the second electrically controlled three-way ball valve (31), the third electrically controlled three-way ball valve (41), the fourth electrically controlled three-way ball valve (51), the fifth electrically controlled three-way ball valve (61), the sixth electrically controlled three-way ball valve (71), the seventh electrically controlled three-way ball valve (81) and the eighth electrically controlled three-way ball valve (91) are respectively fixedly connected to the first standard air pipe (22), the second standard air pipe (32), the third standard air pipe (42), the fourth standard air pipe (52), the fifth standard air pipe (62), the sixth standard air pipe (72), the seventh standard air pipe (82) ) and an eighth standard air pipe (92), wherein the surfaces of the first standard air pipe (22), the second standard air pipe (32), the third standard air pipe (42), the fourth standard air pipe (52), the fifth standard air pipe (62), the sixth standard air pipe (72), the seventh standard air pipe (82) and the eighth standard air pipe (92) are respectively provided with a first flow meter (23), a second flow meter (33), a third flow meter (43), a fourth flow meter (53), a fifth flow meter (63), a sixth flow meter (73), a seventh flow meter (83) and an eighth flow meter (93).
2. The multi-concentration point gas sensor automatic calibration according to claim 1 is characterized by: The electrically controlled ball valve (11), the first electrically controlled three-way ball valve (21), the second electrically controlled three-way ball valve (31), the third electrically controlled three-way ball valve (41), the fourth electrically controlled three-way ball valve (51), the fifth electrically controlled three-way ball valve (61), the sixth electrically controlled three-way ball valve (71), the seventh electrically controlled three-way ball valve (81) and the eighth electrically controlled three-way ball valve (91) are electrically connected to the PC control system (200) via a connecting line (201).
3. The multi-concentration point gas sensor automatic calibration according to claim 1, characterized in that: The first flow meter (23), the second flow meter (33), the third flow meter (43), the fourth flow meter (53), the fifth flow meter (63), the sixth flow meter (73), the seventh flow meter (83) and the eighth flow meter (93) are electrically connected to the PC control system (200) via a connecting line (201).
4. The multi-concentration point gas sensor automatic calibration according to claim 1, characterized in that: One end of the first mark gas pipe (22), the second mark gas pipe (32), the third mark gas pipe (42), the fourth mark gas pipe (52), the fifth mark gas pipe (62), the sixth mark gas pipe (72), the seventh mark gas pipe (82) and the eighth mark gas pipe (92) are connected to the gas sensor body (100).
5. The multi-concentration point gas sensor automatic calibration according to claim 1, characterized in that: A plurality of connecting pipes (14) are arranged on the surface of the nitrogen pipe (13), the number of the connecting pipes (14) is the same as the number of the standard gas bottles, and the number of the standard gas bottles is the same as the number of the flowmeter and the standard gas pipe.
6. The multi-concentration point gas sensor automatic calibration according to claim 1, characterized in that: The connecting pipe (14) is connected to the upper air inlet of each electrically controlled three-way ball valve, and the connecting pipe (12) is connected to the lower air inlet of each electrically controlled three-way ball valve.
7. The multi-concentration point gas sensor automatic calibration according to claim 1, characterized in that: The gas sensor body (100) is provided with an air inlet end (101) and an air outlet end (102).