Which dust sensor is of better quality?

The green forest, snow Dilong, Xinmei environmental protection, when doing CPA certification, the calibration benchmarking equipment of the Beijing Institute of Metrology is to take the green forest sensor, the quality must be the top in the industry, but ** is indeed a bit expensive, Xue Dilong's is also a brand manufacturer, but I don't know what's going on, there are very few dust monitoring systems on the market with their home sensors, it may be that the application field is different, Xinmei environmental protection uses a lot of people, our family also uses a lot of home to use their home, their family is really stuffy to make money, I rarely hear them on the market, they are not famous, and the technology is realized, many of them are that their modules go to OEM into their own, and several companies sell dust sensors behind, I bought one back, and found that the use is also a copy or pirated version of Xinmei.

Loefmeer dust sensor.

1. Dust sensors can be applied to instruments such as air purifiers and dust detectors;

2. The main common dust sensors are infrared dust sensors and laser dust sensors, and infrared dust sensors are cheaper than laser dust sensors;

3. The main function of the dust sensor is to detect and monitor the air dust concentration value, and provide data for air purifiers.

At present, air pollution is relatively serious, and we need to take corresponding measures to protect our ecological environment and health, so that we can avoid the harm of environmental pollution. The main source of urban environmental pollution is the source of dust pollution, which is mainly generated in construction sites and has become an important factor of air pollution, and strengthening the prevention and control of dust pollution at construction sites has also become an important task of urban governance.

CW-76S construction site dust sensor (dust detector) is a high-tech product integrating aerodynamics, digital signal processing and photoelectric integration independently developed by Shenzhen Senavi, which is mainly used to detect dust mass concentration (PM value) in the atmosphere, suitable for construction sites, urban grid monitoring, mobile monitoring and other fields and occasions, and is the core module of the air quality detection system.

Depending on your accuracy requirements for dust particle detection, if the accuracy requirements are not high, you can use the Loefmai infrared dust sensor series, based on the principle of infrared light scattering, the detection of diameter particles in the range, and the cost performance is also relatively high. If high-precision dust detection is required, you can choose the Löfmeier laser dust sensor series, which is based on the Mie MIE spherical scattering principle, which can detect the diameter particles in a wide range and have a wide range of applications, without the need for air duct design, and is compatible with multi-protocol output.

Loefmeer dust sensor is divided into infrared dust sensor and laser dust sensor, infrared dust sensor has HPD05 and GDS06 two models, laser dust sensor has LD07, LD09, LD11, LD13, etc., can be installed in vacuum cleaners, sweeping robots, fresh air systems and other dust detection equipment. The measurement principle of the two types of sensors is different, and there are also differences in the measurement accuracy, size, and interface, which can be learned more on the official website.

1) First of all, because it is used in the outdoor environment, it is necessary to consider the geographical environment and meteorological environment, so it must be industrial-grade;

2) The user's requirements for accuracy and range, the general construction site dust monitoring is mainly for the TSP particulate matter concentration, the range can generally reach 10-30mg m3, and the accuracy is OK;

3) The sensor should be able to sample the constant current, and the temperature and humidity can be automatically adjusted and calibrated, otherwise the sensor will be inaccurate in case of wind, rain, fog, freezing, high temperature and other special circumstances.

4) Dustproof, waterproof and insect-proof treatment, if the sampling port is not dust-proof, waterproof and insect-proof treatment, after a period of time, the data must be inaccurate.

5) Among all the manufacturers that meet the requirements, find one with the highest cost performance.

I will only help you tell you the direction of identification, and I will not advertise the specific manufacturer, and find it myself.

The dust sensor is a detection mechanism that uses an advanced detection mechanism to achieve detection, and the detection unit in the dust sensor adopts the principle of particle counting, which can sensitively detect dust particles above the diameter. At present, the principle of dust sensor is mainly based on four principles: gravimetric method, micro-oscillation balance method, ray method and light scattering method, each with its own advantages and disadvantages.

1. The principle of gravimetric method of dust sensor

The principle of gravimetric method is to draw a certain volume of air at a constant speed through a sampler with certain cutting characteristics, so that the PM10 in the ambient air is intercepted on the filter membrane of known quality, and the concentration of dust is calculated according to the quality difference of the filter membrane and the sampling volume before and after sampling. It must be noted that the volume of the denominator in the unit ug m3 of the measured particulate matter should be the volume of 0 under the standard condition, and the volume under the measured temperature and pressure should be converted to the volume under the standard condition.

Advantages: The national standard method is the benchmark for verifying the accuracy of other methods;

Disadvantages: Instantaneous values cannot be displayed, only averages.

2. The principle of micro oscillation balance method for dust sensor

The micro-oscillation balance method uses an oscillating hollow conical tube inside the sensor with a replaceable filter membrane installed at its oscillating end, and the oscillation frequency depends on the characteristics of the conical tube and its quality. When the sample gas flows through the filter membrane, the particulate matter in it is deposited on the filter membrane, and the quality change of the filter membrane leads to the change of the oscillation frequency, and the mass concentration of the particulate matter marker in the period is calculated according to the flow rate, on-site ambient temperature and air pressure.

Advantages: accurate, high sensitivity, wide adaptability, continuous monitoring;

Disadvantages: large size, **expensive.

3. Dust sensor ray method principle:

The ray method is the use of the principle of beta ray attenuation, the ambient air is sucked into the sampling tube by the sampling pump, discharged after the filter membrane, and the particles are precipitated on the filter membrane, when the rays pass through the filter membrane deposited with particles, the energy of the beta ray is attenuated, and the concentration of particulate matter can be calculated by measuring the amount of attenuation.

Advantages: High sensitivity.

Cons: Slow response, usually only uses its hourly average.

4. Principle of light scattering method of dust sensor:

Scattered light is produced when light hits suspended particles in the air, and the intensity of the scattered light is proportional to its mass concentration. The particle concentration value is obtained by measuring the intensity of the scattered light and applying a mass concentration conversion. Multiply by the k-factor for digital signal processing to convert the dust concentration signal into an electrical signal.

Advantages: fast detection speed, small size, cheap, suitable for particle concentration measurement in public places;

Disadvantages: Not sure if its accuracy is higher than the other three principles.

CW-76S construction site dust sensor (dust detector) is a high-tech product integrating aerodynamics, digital signal processing and photoelectric integration independently developed by Shenzhen Senavi, which is mainly used to detect dust mass concentration (PM value) in the atmosphere, suitable for construction sites, urban grid monitoring, mobile monitoring and other fields and occasions, and is the core module of the air quality detection system.

The construction site will cause dust because of large-scale operations, is the main source of urban dust pollution, the installation site dust monitoring system at the construction site can effectively improve the dust environment, when the dust caused by the operation reaches a certain concentration, take certain dust reduction measures, reduce dust pollution. There are many foreign and domestic manufacturers of dust sensors for light scattering method, and they are divided into ordinary light scattering and laser light scattering method. Because of the good repeatability and stability of the laser light scattering instrument, the ordinary light scattering method has been completely replaced in Europe, the United States and Japan.

If you choose a good manufacturer, you can achieve high cost performance. However, the quality of domestic sensors varies greatly, and attention should be paid to choosing manufacturers with guaranteed quality.

It is recommended that Loefmeier's laser dust sensor adopts the principle of laser Mie spherical scattering combined with Loewmeier's spatial measurement patent to achieve accurate measurement; Zero false alarm rate; Real-time response and continuous acquisition; Minimum resolving particle size; The service life of the electronic control device is 8 years, and the average working time without failure is 5 years; The six-sided all-round shielding combined with the software anti-jamming algorithm has stronger anti-jamming performance; Wide range of application, no need for air duct design, compatible with multi-protocol output; The design is thin and lightweight, suitable for detectors, wearable devices, air purifiers, fresh air systems, etc.

Dust concentration sensors, that is, sensor products used for the monitoring of powdery materials, the total amount of process transportation, the emission monitoring of various fuel boilers and other productive soots, include infrared and laser: infrared dust sensors (including Shenrong, GE, Sharp and other brands) and laser dust sensors (including Shenzhen Senavi, Nuofang Electronics, Sifang Optoelectronics, Panteng Technology and other brands), the two are very different.

First of all, the laser sensor is higher than the infrared generally. Then from the structure, the laser dust sensor has a complex structure, the light source is a laser diode, the air flow in and out is generally specially designed, the sampling air is pushed by a fan or blower, and the output is generally a serial output, like SDS011 and PWM output to save serial port resources of the host computer. Infrared, on the other hand, is relatively simple.

Functionally, the detection data of the laser dust sensor is very close to that of professional instruments, and the credibility of the data is relatively high, while the data performance of the traditional infrared dust sensor is far behind.

CW-76S construction site dust sensor (dust detector) is a high-tech product integrating aerodynamics, digital signal processing and photoelectric integration independently developed by Shenzhen Senavi, which is mainly used to detect dust mass concentration (PM value) in the atmosphere, suitable for construction sites, urban grid monitoring, mobile monitoring and other fields and occasions, and is the core module of the air quality detection system.

Compared with the automatic atmospheric monitoring station, dust monitoring, smart city monitoring station, air micro station and other related air quality monitoring equipment is low cost and easy to deploy, and has become an auxiliary tool for environmental supervision and monitoring of departments at all levels. There are a variety of sensor brands on the market, and the consistency, stability, and quality of the sensor are uneven, in order to reduce after-sales maintenance, the right sensor manufacturer must be selected before product integration.

CW-76S construction site dust sensor (dust detector) is a high-tech product independently developed by Shenzhen Senavi that integrates aerodynamics, digital signal processing and optoelectronics, and is mainly applied to detect dust mass concentration (PM value) in the atmosphere, suitable for construction sites, urban grid monitoring, mobile monitoring and other fields and occasions, and is the core module of the air quality detection system.

Laser dust sensors from Loefmeier.

The laser Mie MIE spherical scattering principle combined with the Löfmeier space measurement patent achieves accurate measurement;

Zero false alarm rate;

Real-time response and continuous acquisition;

Minimum resolving particle size;

The service life of the electronic control device is 8 years, and the average working time without failure is 5 years;

The six-sided all-round shielding combined with the software anti-jamming algorithm has stronger anti-jamming performance;

Wide range of application, no need for air duct design, compatible with multi-protocol output;

The design is thin and lightweight, suitable for detectors, wearable devices, air purifiers, fresh air systems, etc.