CN211978226U - Leak detector with double measuring ranges and automatic heating compensation - Google Patents
Leak detector with double measuring ranges and automatic heating compensation Download PDFInfo
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- CN211978226U CN211978226U CN202020452701.XU CN202020452701U CN211978226U CN 211978226 U CN211978226 U CN 211978226U CN 202020452701 U CN202020452701 U CN 202020452701U CN 211978226 U CN211978226 U CN 211978226U
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- 238000005070 sampling Methods 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
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Abstract
The utility model relates to a leak detector with double measuring ranges and automatic heating compensation, which comprises a main controller, a high-range infrared double-wave sensor, a low-range infrared double-wave sensor, a first heating module, a second heating module, a temperature sensor, a PWM temperature control module, a gas circuit switching module and a power supply module; the high-range infrared double-wave sensor and the low-range infrared double-wave sensor are respectively connected with the main controller; the temperature sensor is respectively connected with the main controller, the high-range infrared double-wave sensor and the low-range infrared double-wave sensor; the first heating module is respectively connected with the high-range infrared double-wave sensor and the PWM temperature control module; the second heating module is respectively connected with the low-range infrared double-wave sensor and the PWM temperature control module; the gas circuit switching module is used for switching a range mode. The utility model discloses be equipped with the heating module, can let the sensing work at the temperature point that keeps a invariant to exert its best performance.
Description
Technical Field
The utility model relates to a gas leak hunting field, concretely relates to leak detector with double-range and self-heating compensation.
Background
The SF6 gas has excellent arc extinguishing performance and is widely applied to power systems. The SF6 gas leak detector has important effect in links such as electric power safety production, inspection, patrol and examine, and along with the improvement of product voltage level, has provided higher requirement to the precision, stability, the convenient to use nature of leak detection device. In order to ensure the reliability of measurement, the utility model relates to a measurement of SF6 gas leakage quantity in GIS, the equipment range is 0-1000ppm, the concentration of leaking gas is sampled by adopting an infrared double-wave sensor mode, and the measurement device has the advantages of higher precision, fast response and the like. Because the sensor is greatly influenced by temperature, when the sensor works at low temperature (-10 to-20 ℃), the precision of the sensor has a certain difference with the measurement at normal temperature, and a special heating device needs to be made, so that the sensor can have excellent performance under severe use environment and temperature.
Based on the current development of infrared double-wave leak detectors at home and abroad, various detection schemes are provided, such as high-frequency magnetic field ionization, Electronic Capture Detector (ECD), laser photoacoustic detection principle, negative ion capture, infrared (NDIR) double-wave type and the like. In the application of the portable leak detector, the infrared double wave method has the advantages of simple structure, better precision, high cost-to-price ratio and the like. On the basis of absorbing the advantages of the leak detectors at home and abroad, the product improves the measurement accuracy of the environmental leakage gas at low temperature by matching a current mainstream hardware platform and a software algorithm with a high-range and low-range infrared sensor, a temperature PID control circuit, a sensor gas chamber semiconductor heater, a temperature sensor and a circuit.
Most of infrared portable leak detectors widely used in the market at present have the defects of low precision in low concentration, poor precision and repeatability in high concentration and the like. And the accuracy of the sensor is greatly influenced at low temperature (-10 ℃ to-20 ℃), so that the accuracy of the sensor is greatly influenced. In order to ensure the measurement reliability, a sealed air chamber is needed, the sensor is placed in the air chamber, the heating circuit is started to heat the air chamber, the temperature sensor in the air chamber reflects temperature information in real time, and the heater is turned off when the temperature rises to a certain value. When the temperature drops to a certain value, the heating is restarted, so that the temperature is kept at the low temperature of the infrared sensing and has the performance of normal temperature.
Disclosure of Invention
In view of this, the utility model aims at providing a leak detector with dual-range and self-heating compensation to it is low to solve current leak detector precision when low concentration, precision and repeatability subalternation problem during high concentration.
In order to realize the purpose, the utility model adopts the following technical scheme:
a leak detector with double measuring ranges and automatic heating compensation comprises a main controller, a high-range infrared double-wave sensor, a low-range infrared double-wave sensor, a first heating module, a second heating module, a temperature sensor, a PWM (pulse width modulation) temperature control module, a gas circuit switching module and a power supply module; the high-range infrared double-wave sensor and the low-range infrared double-wave sensor are respectively connected with the main controller; the temperature sensor is respectively connected with the main controller, the high-range infrared double-wave sensor and the low-range infrared double-wave sensor; the first heating module is respectively connected with the high-range infrared double-wave sensor and the PWM temperature control module; the second heating module is respectively connected with the low-range infrared double-wave sensor and the PWM temperature control module; the gas circuit switching module is used for switching a range mode.
Furthermore, the main controller reads the numerical values of the high-range infrared double-wave sensor and the low-range infrared double-wave sensor through the RS485 circuit.
Further, the temperature sensor adopts a three-wire type PT100 temperature sensor.
Compared with the prior art, the utility model following beneficial effect has:
the utility model discloses be provided with the heating module, start the heating at the low temperature, hardware cooperation software drive semiconductor heater can compensate infrared formula SF6 sensor performance under the lower temperature.
Drawings
Fig. 1 is a schematic block circuit diagram of the present invention;
FIG. 2 shows an embodiment of the present invention in which the temperature control heating module
Fig. 3 is a temperature sampling circuit according to an embodiment of the present invention;
fig. 4 is a circuit of the gas circuit switching module according to an embodiment of the present invention.
Detailed Description
The present invention will be further explained with reference to the drawings and the embodiments.
Please refer to fig. 1, which illustrates an embodiment of a leak detector with dual ranges and automatic heating compensation, including a main controller, a high-range infrared dual-wave sensor, a low-range infrared dual-wave sensor, a first heating module, a second heating module, a temperature sensor, a PWM temperature control module, a gas path switching module, and a power supply module; the high-range infrared double-wave sensor and the low-range infrared double-wave sensor are respectively connected with the main controller; the temperature sensor is respectively connected with the main controller, the high-range infrared double-wave sensor and the low-range infrared double-wave sensor; the first heating module is respectively connected with the high-range infrared double-wave sensor and the PWM temperature control module; the second heating module is respectively connected with the low-range infrared double-wave sensor and the PWM temperature control module; the gas circuit switching module is used for switching a range mode.
In this embodiment, the MCU is a main controller, the current temperature sensors of the sensors are sent to the AD ports of the MCU for data sampling, so as to realize heating control of the sensors, and when the sensors are in a low temperature environment (set to-10 ℃), the sensors start the heating module to perform accurate temperature control in a PID manner. And the MCU reads the concentration indicating value of the sensor through the RS485 circuit.
Referring to fig. 2, in this embodiment, the PWM temperature control module has two heating outputs, and when the temperature of the sensor does not reach a predetermined temperature, the IO port of the single chip outputs a PWM signal to control the PMOS transistor to be turned on and off, and finally control the semiconductor heater to be turned on and off. The software adopts an incremental algorithm to accurately control and compensate the temperature parameter, so that the temperature parameter is kept between 0.05 ℃. Thus, the sensor works at the optimal temperature point, and the compensation algorithm on the software becomes simple due to the temperature compensation on the hardware.
Referring to fig. 3, in the present embodiment, a temperature sampling circuit is designed, specifically: the operational amplifier U411 is a precise constant current circuit, outputs a constant current signal to the temperature sensor RT410(PT100), samples difference signals at two ends of the PT100, sends the difference signals to a precise instrument amplifier with high precision, low noise and high anti-interference, outputs the difference signals to an AD acquisition port of the singlechip through an RC filter circuit (R412, C403) for analog-to-digital conversion, and converted digital signals correspond to analog temperature signals before single processing. And then digital filtering and analysis are carried out through a software algorithm of the singlechip, and PWM control signals are input and output, so that the heating state of the heater is changed.
In this embodiment, an air path switching module is further provided, the default operating state is a wide range mode (0-1000 ppm), and when the measured gas concentration is less than 50ppm, the air path switching module is switched to a small range mode (0-50 ppm) through an electromagnetic valve, as shown in fig. 4, the air path switching module is a range switching circuit. The system adopts a 12V electromagnetic valve to realize range switching.
The above is only the preferred embodiment of the present invention, and all the equivalent changes and modifications made according to the claims of the present invention should be covered by the present invention.
Claims (3)
1. A leak detector with double measuring ranges and automatic heating compensation is characterized by comprising a main controller, a high-range infrared double-wave sensor, a low-range infrared double-wave sensor, a first heating module, a second heating module, a temperature sensor, a PWM (pulse width modulation) temperature control module, a gas circuit switching module and a power supply module; the high-range infrared double-wave sensor and the low-range infrared double-wave sensor are respectively connected with the main controller; the temperature sensor is respectively connected with the main controller, the high-range infrared double-wave sensor and the low-range infrared double-wave sensor; the first heating module is respectively connected with the high-range infrared double-wave sensor and the PWM temperature control module; the second heating module is respectively connected with the low-range infrared double-wave sensor and the PWM temperature control module; the gas circuit switching module is used for switching a range mode.
2. A leak detector with dual range and auto-heat compensation as defined in claim 1, wherein: and the main controller reads the numerical values of the high-range infrared double-wave sensor and the low-range infrared double-wave sensor through the RS485 circuit.
3. A leak detector with dual range and auto-heat compensation as defined in claim 1, wherein: the temperature sensor adopts a three-wire PT100 temperature sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020452701.XU CN211978226U (en) | 2020-04-01 | 2020-04-01 | Leak detector with double measuring ranges and automatic heating compensation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020452701.XU CN211978226U (en) | 2020-04-01 | 2020-04-01 | Leak detector with double measuring ranges and automatic heating compensation |
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| Publication Number | Publication Date |
|---|---|
| CN211978226U true CN211978226U (en) | 2020-11-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020452701.XU Active CN211978226U (en) | 2020-04-01 | 2020-04-01 | Leak detector with double measuring ranges and automatic heating compensation |
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| Country | Link |
|---|---|
| CN (1) | CN211978226U (en) |
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2020
- 2020-04-01 CN CN202020452701.XU patent/CN211978226U/en active Active
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A leak detector with dual range and automatic heating compensation Effective date of registration: 20231007 Granted publication date: 20201120 Pledgee: Bank of China Limited Xiamen hi tech Park sub branch Pledgor: Xiamen Jiahua Electrical Technology Co.,Ltd. Registration number: Y2023980060154 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |