Be wary of low-quality counterfeit DHT11 products DHT11 is a capacitive temperature and humidity sensor product independently developed and produced by Aosong Electronics in 2009. With its good performance and excellent cost performance, it has always been welcomed by the market, and its products are sold well both at home and abroad. When DHT11 was discontinued, the market was flooded with copycat workshops using inferior resistive humidity sensors to counterfeit "DHT11", causing many customers to suffer heavy losses. Aosong Electronics reminds customers to avoid damage to their interests. Customers are requested to carefully identify the "ASAIR®" trademark of Aosong Electronics and purchase high-quality sensor products. DHT11 Product Appearance With the continuous upgrading of advanced MEMS technology in sensor applications, Aosong Electronics has launched a classic-capacitive temperature and humidity sensor module, DHT11, which will withdraw from the stage of history! Instead, Aosong Electronics has carefully crafted a brand-new upgraded intelligent temperature and humidity sensor module, DHT20! This is a calibration-free, low-power, high-precision, high-stability product, with a fully calibrated digital IIC interface, fast response, strong anti-interference ability, and higher cost performance. DHT20 Product Appearance Comprehensive performance upgrade, extraordinary performance DHT20 was developed "standing on the shoulders of giants." Relying on the successful research and development experience of a generation of classic DHT11, DHT20 is equipped with a brand-new temperature and humidity sensor chip in the module. In the sensor manufacturing industry, the accumulation of experience in project development is crucial. Aosong Electronics has nearly 20 years of R&D experience and expertise. With the support of the advanced MEMS semiconductor sensor chip production line, DHT20 has been comprehensively improved, with sufficient production capacity and stable supply. The product has an extraordinary performance. The performance of the product has skyrocketed. While reducing power consumption and cost, the performance parameters of measurement accuracy, power supply voltage, measurement range, response time, stability and other aspects have been greatly improved, far beyond The reliability level of previous generation sensors. Performance Parameter Comparison Chart Wide Range of Applications Each product of DHT20 has been rigorously calibrated and tested before leaving the factory and can maintain stable performance even in harsh environments. It can be widely used in HVAC, dehumidifier, testing and inspection equipment, consumer products, automobiles, automatic control and data Recorders, weather stations, home appliances, humidity control, medical and other related temperature and humidity detection and control fields. Real-time monitoring of temperature and humidity changes in environmental scenes to better create a comfortable environment and better guarantee the safe storage of items. About Aosong Aosong Electronics is a high-tech sensor enterprise integrating R&D, production and sales. It has self-developed sensor chips and advanced MEMS semiconductor manufacturing process production lines. With nearly 20 years of sensor research and development experience, it provides global customers with application terminal solutions. Solutions continue to provide customers with better services and create higher value.
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The temperature and humidity in life are two parts that are closely related to us. Still, the perception of this part is not detectable by the human eye but needs to be detected by the physical quantity itself. Temperature and humidity sensors have this purpose, mainly used to measure temperature and humidity in various environments. With the accelerated development of society and industrial processes, the application of temperature and humidity sensors has been popularized in various fields of industrial life. In the broad application of products, many users do not grasp the precautions when using the products they purchased, resulting in inaccurate measurement data when using the products to detect temperature and humidity. The following is a brief description of the precautions during the use of the temperature and humidity sensor: First of all, you need to know the measurement range when you choose and pay attention to what interval value the instrument you purchased is measuring. Because some sensors measure relative humidity and some are absolute humidity, ask the manufacturer or read the label. The second, the impact of drift. Due to the influence of dust, oil and harmful gases in practical applications, the instrument will age with the extension of use time. Therefore, users need to consider the problem of reduced accuracy. Usually, the annual drift of the product is about plus or minus 2%, or even higher; the user should recalibrate the temperature and humidity range according to the validity period indicated in the product manual. Finally, measurement accuracy is also the most important indicator for selecting a temperature and humidity sensor. Users should consider the company's needs when purchasing, not blindly pursuing precision, but buying the precision they need to improve the cost-effectiveness. Under different ambient temperatures, the indicated value should also consider the influence of temperature drift. At present, Guangzhou Aosong Electronics Co., Ltd. has launched the third-generation integrated temperature and humidity sensor AHT21, which is an accurate and reliable humidity measurement sensor. AHT21 is equipped with a newly designed ASIC special chip, an improved MEMS semiconductor capacitive humidity sensor element and a standard on-chip temperature sensor element. Its performance has been dramatically improved or even exceeded the reliability level of the previous generation of sensors. A generation of temperature and humidity sensors has improved their performance in harsh environments more stable. The integrated temperature and humidity sensor AHT21 of Aosong Electronics is ultra-low power consumption, high-precision digital output temperature sensor. It has many advantages such as I2C interface digital output, excellent long-term stability, rapid response, strong anti-interference ability, etc. It is widely used in HVAC, dehumidifier, testing and inspection equipment, consumer products, automobiles, automatic control, data loggers, meteorology Stations, home appliances, humidity control, medical and other related temperature and humidity detection and control.
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Since temperature and humidity are closely related to physical quantities and actual people's lives, a sensor integrating temperature and humidity will be produced accordingly. Temperature and humidity sensor refers to a device or device that can convert temperature and humidity into electrical signals that can be easily measured and processed. Aosong Electronics' temperature and humidity sensors generally measure temperature and relative humidity. Digital signal temperature and humidity sensors are mainly divided into two programs: 1-wire and I2C. Temperature: A physical quantity that measures the cold and heat of an object. It is one of the seven fundamental physical quantities in the International System of Units. In production and scientific research, many physical phenomena and chemical processes are carried out at a specific temperature, and people's lives are closely related to him. Humidity: Humidity was closely related to living a long time ago, but it is difficult to express it by quantity. The most commonly used physical quantity to express humility in daily life is the relative humidity of the air. Expressed by %RH. The relative humidity is closely related to temperature in the derivation of physical quantities. For a specific volume of airtight gas, the higher the temperature, the lower the relative humidity, and the lower the temperature, the higher the relative humidity. Which involves complex thermal engineering knowledge. Some definitions of humidity: Relative humidity: In the measurement law, humidity is defined as the "quantity of the object's state." The humidity referred to in daily life is relative humidity, expressed in RH%. In short, that is, the percentage of saturated water vapor (saturated water vapor pressure) in the gas (usually in the air) when the amount of water vapor (water vapor pressure) is the same as that of the air. Absolute humidity: refers to the amount of water vapor contained in a unit volume of air, generally in grams. The temperature has a direct effect on absolute humidity. Generally, the higher the temperature, the more water vapor is emitted, and the greater the absolute humidity; on the contrary, the lower the humidity. Saturated humidity: The maximum amount of water vapor that can be contained in the air per unit volume at a specific temperature. If it exceeds this limit, the excess water vapor will condense and become water droplets, and the air humidity at this time will become saturated humidity. The saturated humidity of the air is not fixed. It changes with the change of temperature. The higher the temperature, the more water vapor can be contained in the unit volume of air, and the greater the saturated humidity. Dew point: refers to the air containing a certain amount of water vapor (absolute humidity). When the temperature drops to a certain level, the water vapor contained in it will reach a saturated state (saturated humidity) and begin to liquefy into the water, this phenomenon is called condensation. The temperature at which water vapor begins to liquefy into water is called "dew point temperature" or "dew point," for short. If the temperature continues to drop below the dew point, the super-saturated water vapor in the air will condense into water droplets on the object's surface. In addition, the wind is closely related to the temperature and humidity in the air, and it is also one of the critical factors affecting the changes in air temperature and humidity.
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1. Select The Measurement Range Like measuring weight and temperature, selecting a humidity sensor must first determine the measurement range. Except for meteorological and scientific research departments, those engaged in temperature and humidity measurement and control generally do not require complete humidity measurement (0-99.9%RH). 2. Select The Measurement Accuracy The measurement accuracy is the most critical indicator of the humidity sensor. Every increase of one percentage point is a step up, or even the last level, for the humidity sensor. Because to achieve different accuracy, the manufacturing cost varies greatly, and the selling price also varies greatly. Therefore, users must tailor their clothes, and it is not advisable to blindly pursue "high, precise and sharp." If the humidity sensor is used at different temperatures, the display value should also consider the influence of temperature drift. As we all know, relative humidity is a function of temperature, and temperature seriously affects the relative humidity in a given space. The temperature changes by 0.1°C. A humidity change (error) of 0.5% RH will occur. If it is difficult to achieve a constant temperature in the application, it is inappropriate to propose that the humidity measurement accuracy is too high. In most cases, if there is no precise temperature control method, or the space to be measured is not sealed, accuracy of ±5% RH is sufficient. For local spaces requiring precise control of constant temperature and humidity, or occasions where humidity changes need to be tracked and recorded at any time, then choose a humidity sensor with an accuracy of ±3%RH or more. The requirement of accuracy higher than ±2%RH may be difficult even for the standard humidity generator to calibrate the sensor, not to mention the sensor itself. Relative humidity measuring instrument, even at 20-25℃, it is still challenging to reach the accuracy of 2%RH. Usually, the characteristics given in the product information are measured at room temperature (20℃±10℃) and clean gas. 3. Consider Time Drift and Temperature Drift In actual use, due to the influence of dust, oil and harmful gases, the electronic humidity sensor will age, and the accuracy will decrease after a long time of use. The annual drift of the electronic humidity sensor is generally around ±2%, or even higher. Under normal circumstances, the manufacturer will indicate that the adequate use time for one calibration is 1 or 2 years, and the calibration must be re-calibrated when it expires. 4. Other Matters Needing Attention The humidity sensor is non-sealed. In order to protect the accuracy and stability of the measurement, it should be avoided as far as possible in acidic, alkaline and organic solvent-containing atmospheres. Also, avoid using in dusty environments. In order to accurately reflect the humidity of the space to be measured, it is also necessary to avoid placing the sensor in a blind corner that is too close to the wall or where the air does not circulate. If the room to be tested is too large, multiple sensors should be placed. Some humidity sensors require a relatively high power supply. Otherwise, the measurement accuracy will be affected. Or the sensors interfere with each other or even fail to work. When in use, a suitable power supply that meets the accuracy requirements should be provided by the technical requirements. When the sensor needs to carry out long-distance signal transmission, pay attention to the attenuation of the signal. When the transmission distance exceeds 200m, it is recommended to use a humidity sensor with a frequency output signal.
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As a classic representative of carbonated beverages, Coca-Cola has been enduring in the market and is loved by people worldwide. The unique taste of carbonated drinks is due to the addition of carbon dioxide. After the beverage enters the stomach, with the discharge of carbon dioxide, it takes away the heat from the human body and has a cool and comfortable feeling. Therefore, carbonated beverages are the best cold drinks in midsummer. How are carbonated drinks made? So how is carbon dioxide input into carbonated beverages, and how is the gas flow control performed? Carbonated beverages need to use equipment in the manufacturing process, called a carbonated beverage preparation machine. This equipment is characterized by a container containing liquid, a fluid pipeline connecting the container and an air inlet pipeline, and a gas cylinder containing high-pressure carbon dioxide gas. After the carbonization pump pressurizes the filtered water, it is thoroughly cooled through the coil in the ice water tank. It then enters the carbonization cylinder to mix with carbon dioxide to form carbonated water. The carbonated water is pushed by the high-pressure CO2 in the carbonization cylinder to the valve head for proportional distribution to produce carbonated beverages. The carbonated beverage preparation machine is provided with a fluid pressure reducing valve, which can quickly reduce the pressure of the carbonated beverage containing space to a predetermined pressure value to take out the carbonated beverage in the containing space. Portable Gas Mass Flow Meter In the production process of carbonated beverages, the flow rate of the gas cylinder that provides carbon dioxide needs to be regulated. Otherwise, excessive carbon dioxide will produce a large amount of foam. Generally, manufacturers use portable gas mass flow meters to monitor the flow of CO2 gas delivered by beverage preparation machines. The latest AMS2106 intelligent digital gas mass flow meter developed by Guangzhou Aosong Electronics Co., Ltd. has the characteristics of high sensitivity, flexible output mode, and high stability in the full range. Platinum Chip, High Precision and High Stability Aosong Electronics is a MEMS IDM company and has been deeply involved in MEMS smart sensors for nearly 20 years. With its rich experience, it independently developed the MEMS flow sensor chip used in AMS2106. Some of its materials are made of precious metal platinum. Due to the high stability of platinum, the chips made with it have long-term solid stability and long service life. The product range ratio has reached 50:1, with reasonable accuracy in the full range. Quick Response and High Sensitivity The AMS2106 adopts thermal mass flow measurement without the customer's additional temperature and pressure compensation, which ensures the high-precision calculation of the flowmeter, high sensitivity, and can keenly perceive the minimal starting flow rate and start the calculation. The product can display instantaneous and cumulative flow, which is convenient for users to view, supports the measurement of multiple gases, and allows customers to perform on-site calibration of some special gases. The product has two modes of battery power supply and external power supply, which will not impact the data when switching. Can Detect a Variety of Gases, a Wide Range of Applications In addition to monitoring CO2, the AMS2106 gas mass flowmeter can also monitor various dry, clean, non-corrosive gases such as air, nitrogen, oxygen, and argon. The scope of application is also vast. It applies to various fields such as industrial gas monitoring, medical oxygen monitoring, nitrogen filling of food packaging, mask machine gas monitoring, pharmaceutical and laboratory gas flow ratio.
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