Application of temperature and humidity sensors in various fields

Application of Temperature and Humidity Sensor in Subway Environment

The passenger flow in the subway is large, and the amount of fresh air required varies greatly. Therefore, the air conditioning load of the subway varies greatly, and it is necessary to use automatic control means to achieve energy saving.​

​In this regard, indoor temperature and humidity sensors are installed in public areas such as station halls and platform areas of subway stations, as well as in important equipment rooms, so that the real-time temperature and humidity of the station can be monitored. These parameters can help the operator to make reasonable adjustments to the system conditions of the station to keep the public area of the station in a more comfortable environment and ensure that the equipment room is always at a suitable temperature.

At the same time, a pipeline temperature and humidity sensor is installed in the fresh air chamber and the return air chamber of the station to monitor the temperature and humidity of the outdoor fresh air and the station. The environmental control system can judge the environmental quality of the station according to the data collected by the temperature and humidity sensor, and automatically switch according to various pre-designed working conditions to realize automatic control of the station environment by the automatic control system, so that the station environment is always In a more comfortable environment, and ultimately achieve the purpose of energy-saving emission reduction. Pipe temperature and humidity sensors are generally installed on the walls of the fresh air chamber and the return air chamber.

Application of Temperature and Humidity Sensor in Storage and Transportation of Vaccine Cold Chain

Vaccine storage must have strict temperature control standards, and the formal vaccine storage distribution chain should be equipped with temperature and humidity monitoring equipment throughout the process to meet the requirements of the Good Manufacturing Practice (GSP). Therefore, the participation of temperature and humidity sensors is essential. In the vaccine storage, transportation and distribution process, the cold chain has a temperature monitoring record and is filed. When the CDC checks and inspects each batch, it must check the temperature and humidity records on the way at the same time, and confirm that the temperature records in transit meet the relevant GSP regulations and then re-examine the income bank.

The combination of temperature and humidity sensors and electronic tag technology provides a better solution for temperature and humidity monitoring and measurement in such applications. The electronic tag is an information carrier chip that uses RF technology for short-range communication. It is compact and easy to install and use. It is very suitable for information labeling and identification of scattered items.

By integrating the temperature and humidity sensor onto the electronic tag, the electronic tag can measure the temperature and humidity values of the installed article or application environment, and transmit the measured value to the reader by radio frequency (RF). Finally, it is sent to the application backend system by the reader in a wireless/wired manner.

The vaccine management staff of the disease control department can view the temperature and humidity data from the temperature and humidity sensors of the cold chain equipment such as refrigerators and cold chain transport vehicles in the whole district or the unit in real time through the computer or mobile phone APP, and can be retrieved at any time. The historical temperature record of the cold chain equipment accurately grasps the operation status of the cold chain equipment in any time period.

In the event of an emergency such as a power outage, the manager will receive an alarm message at the first time and process it in time to reduce the loss caused by the cold chain temperature to a relatively low level.

Energy-saving application of temperature and humidity sensor on textile setting machine

The textile industry setting machine has both water vapor, flue gas and hot air in the exhaust gas. Increasing the amount of water vapor and flue gas and reducing the amount of hot air discharged can reduce energy consumption. The National Development and Reform Commission's "Entry Requirements for Printing and Dyeing Industry" requires "on-line monitoring devices for setting humidity and various drying processes."

At present, the temperature and humidity adjustment methods adopted by most printing and dyeing factories are simple manual adjustment methods. The specific adjustment is controlled by the exhaust fan at the top of the equipment, and the exhaust pipe is equipped with a manual regulating valve. The use of intelligent monitoring methods is an effective way to save energy.

During a given drying time, the amount of water evaporation in the oven is related to the raw material composition of the fabric, the density of the fabric, the width, the moisture content of the fabric before and after drying, and the drying speed. The change in "evaporation efficiency" and "energy consumption" of the dryer is non-linear under different exhaust humidity conditions. The heat utilization efficiency of the setting machine is less than 30%, and a considerable heat loss is during the exhaust process. It has been determined that when the exhaust gas humidity is 5%, the air volume is 19 times that of water vapor; and when the exhaust gas humidity is 20%, the air volume is four times that of water vapor. The heat carried by the hot air which is 15 times the volume of the water vapor is completely wasted. The high temperature humidity measuring instrument with the temperature and humidity sensor can automatically control the drying humidity of the setting machine, thereby saving a lot of heating costs.

Temperature sensor application in the pharmaceutical industry

In the risk control of the pharmaceutical industry, the effect of *** is the top priority. Most *** uses thermal ***, so monitoring temperature data has a very important position in the pharmaceutical industry. For sterile preparations, the pharmaceutical industry regulations require periodic temperature verification. The heat penetration test directly reflects the *** effect of the *** product by converting the temperature value inside the product into a lethal rate.

Therefore, the accuracy of temperature data collection in the pharmaceutical industry is very high. There are two main types of temperature sensors commonly used in the industry: T-type couples and platinum resistors in thermocouples. It is usually recommended to use a T-type couple. The reason is that the T-type is a thermocouple with good linearity at low temperature, and it is also a thermocouple with an accuracy of 0.5 ¡ãC in the low temperature range. However, since the T-type material is made of copper and constantan, it is prone to oxidation reaction in a high temperature environment, resulting in drift of precision. Therefore, the Pharmacopoeia requires the use of a T-type thermocouple sensor as the verification hardware, which needs to be calibrated before and after each use to determine the accuracy of the T-type thermocouple within the verified temperature range.

Platinum resistance sensors have a very good application in damp heat ***. Damp heat *** refers to the method of using saturated steam, boiling water or circulating steam to use ***, high temperature and high pressure water vapor as the medium, due to the large latent heat of steam, strong penetrating power, easy to denature or solidify proteins, eventually leading to microorganisms Death. Platinum resistance has the advantages of high precision and high stability, so it is especially suitable for use in the pharmaceutical industry where the temperature is controlled below 400 ¡ãC. Since the annual accuracy drift of the platinum resistance is extremely small, the platinum resistance sensor is used as the verification temperature sensor, and there is no explicit requirement for front-back calibration.

As temperature sensors have increased in use in the pharmaceutical industry, their related technologies have matured. However, in the user's use, the difference in details will produce a very different user experience. Only by understanding the specific use environment in the pharmaceutical industry can we better solve the problems faced by users.

​Application of temperature and humidity sensor in air purifier

As consumers' attention to air pollution continues to increase, air purification products have gradually become the focus of the market, and many people have installed air purifiers at home. Currently, air purifiers on the market are generally equipped with three types of sensors - a temperature and humidity sensor, a dust sensor and an odor sensor.

In the air purifier, the current temperature and humidity sensor is more and more miniaturized. Its function is to detect the indoor humidity (dry state). The purifier controls the humidification amount according to the data to ensure that the indoor environment is within a certain humidity range. Maintain a fairly comfortable humidity.

The digital temperature and humidity integrated sensor is used for air quality analysis through data acquisition, and the humidifying device and the air purifying device are controlled to perform air purification. Ability to monitor, respond to, and respond to indoor air quality conditions in real time

​The high-precision, high-stability temperature and humidity sensor is used to provide real-time high-quality air quality monitoring, and the MCU independently detects and judges the environment, and activates the air purifying device and the ultrasonic humidifier in time to save energy and save energy.

Temperature and humidity sensor for monitoring in intelligent agriculture

"Intelligent agriculture" is an integrated technology system that uses technologies such as computers and networks, Internet of Things, and wireless communications to realize the functions of fine management, remote control, and catastrophic warning of modern agricultural production. A multi-layered humidity sensor is installed in the soil. In this process, if the soil moisture sensor is less than 20% for a long time, the entire system will give an early warning to the company's headquarters.

The temperature and humidity sensor promotes the construction of ¡°smart greenhouse¡±. The technician can directly control the remote control at home through a computer or a mobile phone. If the temperature in the shed has exceeded 35 degrees, the technician can directly open the fan in the entire facility through the remote control of the mobile phone. When the soil moisture is less than 35%, spray irrigation is started immediately, and the water supply is started immediately. People can do this control at any time and any place. Using the greenhouse model, the intelligent greenhouse remote management mode is realized.

Temperature and humidity sensor applied to tobacco leaf fermentation process

In the tobacco industry, the storage of tobacco leaves is one of the important factors related to the quality of finished tobacco. A good fermentation process is a prerequisite for making good smoke.

Because the tobacco leaves naturally ferment for a long time, the whole fermentation process will experience 4-6 rainy seasons. In order to ensure that the desired alcoholization results are not solved from start to finish, process management, especially the management of temperature and humidity, must be strengthened. Do a good job of moisture and mildew prevention. The temperature is quite good at around 20 ¡ã C, and the relative humidity is quite good at 60% -70%. In this way, the wireless temperature and humidity sensor is very suitable for monitoring and controlling temperature and humidity.

If the water content of the tobacco leaves is high, the volume of the tobacco pile is too large and the accumulation is tight. When the outside temperature is high, the temperature inside the cigarette pack will increase and heat, causing carbonization of the tobacco leaves (that is, burning). In the case of natural ventilation, the method of window ventilation is adopted to remove the unsuitable hot humid air in the storage to prevent the tobacco from heating.

The moisture content of the first flue-cured tobacco and the sun-cured tobacco is 16.0%-18.0%, and a few cigarette packs reach 18% or more. For tobacco leaves with excessive water content, in order to reduce their moisture as soon as possible, reduce or prevent carbonization and mildew, take isolation measures after storage, loosely ventilate and ventilate, and use the exhaust fan to remove moisture from the reservoir to reduce moisture. Up to 15%. In the absence of ventilation ***, dehumidifiers should be used to reduce the relative humidity of the air in the warehouse, so that the water dispersion of the tobacco leaves is within safe limits.

The wireless temperature and humidity sensor can be connected to the dehumidifier control system to automatically monitor the temperature and humidity.

When the preset value is reached, the dehumidifier can be started and stopped. In the future, the dehumidifier *** is used to ensure the normal temperature inside the store.

In the natural fermentation process, attention should be paid to controlling the water content of the tobacco leaves and the temperature of the cigarette packets. The cigarette packets are often inspected, and the wireless temperature and humidity sensor system can be used to improve the fermentation quality of the tobacco leaves.

Application of temperature and humidity sensor in central computer room

With the rise and rapid development of the Internet, the exchange and dissemination of information is getting faster and faster, and the amount of information is also growing. The central computer room has become an important place for some companies and related organizations to store, process and share data. It is very important for enterprises to ensure the normal operation of servers or processors in the equipment room. Since the equipment room is mostly electronic equipment, the ambient temperature and humidity will directly affect its working condition, so the temperature and humidity sensor becomes an indispensable part of the comprehensive monitoring system of the equipment room.

A large number of various semiconductor devices are used in modern electronic computing devices, and heat is heated up during long-term operation. When the temperature rises, the performance of each device decreases. The heat released by the semiconductor to the air will increase the ambient temperature, which will reduce the heat dissipation effect of the semiconductor, further increasing the temperature of the semiconductor device and affecting the normal operation of the device. The ambient temperature is detected by the temperature and humidity sensor. When the temperature is too high, the room cooling measures are started to ensure that the ambient temperature is normal.

In addition, the humidity in the equipment room needs to be kept within the proper range. Because if the relative humidity of the air is too low, that is, when the air is too dry, the static voltage will rise, which will seriously endanger the safety of equipment and personnel. When the air humidity is too high, the water vapor in the air will easily form a water film on the surface of the circuit, resulting in Circuit and arcing phenomenon.

In consumer electronics applications such as smartphones

The main reason that hinders smartphone manufacturers from using temperature and humidity sensors may not come from the sensors themselves. How to turn it into a good user of mobile phone users becomes the key to the application. There have been more and more applications for temperature and humidity sensors.

In the consumer electronics field, traditional applications for temperature and humidity sensors are weather forecasting and indoor monitoring. With the addition of API support for temperature and humidity sensors in Windows 8 and Android 4.0, related third-party application developers will be able to develop a large number of application software based on this.

The accuracy of temperature and humidity sensors used in consumer electronics may not need to be as high, and 5% humidity accuracy, 0.5 ¡ãC temperature accuracy can meet customer needs. As sensor prices continue to decline, I believe that the future is not just high-end mobile phones, including mid-range and low-end smartphones will consider adding this feature.

Application of temperature and humidity sensor on smart devices

With the development of intelligence, sensors are an inevitable configuration on smart devices, and more temperature and humidity sensors are used in smart devices.