Sensors are becoming more widely used in our connected world and are increasingly becoming the core of everyday applications. As more and more sensors are integrated into a variety of products and demand is growing rapidly, design engineers are now facing new challenges in optimizing performance for today's new applications. They usually have to use sensors to monitor parameters such as temperature, humidity, position, and pressure.
The role of the humidity sensorHumidity is the moisture content of the air. Although it can't be observed with the naked eye, we can feel it. It even makes people feel that the temperature is higher than the actual temperature. For people who have been to the world – especially near the equator – the air is hot and heavy, giving people a feeling of sultry and sweaty. This discomfort is not only due to temperature but also from "relative humidity." At 75 degrees Fahrenheit (or 23 degrees Celsius) and relative humidity above 80%, we feel that the temperature exceeds 80 degrees Fahrenheit (or 26.6 degrees Celsius). Humidity plays an important role in our daily activities. It is directly related to personal comfort (keeping food fresh, and opening the HVAC system in hot weather), or more importantly related to life, such as ensuring proper humidity for premature babies to ensure neonatal care and growth.
In today's world, the ability to accurately control the environment is a standard expectation, and leaving the sensor cannot achieve this goal.
At TE Connectivity, our humidity and temperature combination sensors deliver leading response times, measurement accuracy and long-lasting performance even under extreme variations and conditions. In fact, we have been driving the development of sensor technology in digital, wireless and composite solutions, with the aim of making applications smarter and more efficient, and we have been at the forefront of this field.
Here are some of the biggest challenges facing design engineers and how TE's HTU2x humidity and temperature combination sensor design addresses these challenges.
Figure 1: TE Connectivity HTU21D, part of the HTU2x series temperature/humidity sensor. (Image courtesy of TE Connectivity)
Challenge 1 - Today, most applications work over a wide range of humidity and temperatureWhether hot, cold, humid or dry, applications require the same system energy efficiency for the most reliable performance in a wide range of humidity and temperature ranges. This means that the sensor must always achieve optimum performance regardless of external environmental conditions.
Linear response is the key. Regardless of how the temperature and temperature change, the measurement accuracy and stability of the sensor must remain the same. This is critical for applications that are sensitive to environmental changes, such as industrial and electrical applications. For example, when designing a sensor, accurate measurements should be made by providing a linear response and a minimum hysteresis.
The HVAC application is a classic example, and the system can adjust the ambient temperature and humidity to a level that makes you feel comfortable, whether it's hot summer or rainy winter. Regardless of the seasonal change, the humidity sensor undergoes a major phase of relative humidity change and needs to maintain its linear response. The system needs to adapt to seasonal changes that can affect the comfort of home or office.
Regardless of the conditions, the linear response curve of the HTU2x device will allow the HVAC system to maintain the same performance.
Challenge 2 - Applications require fast response times to maintain system performanceSome applications need to be designed to sense the ability of various environmental changes and react quickly to provide best-in-class overall system performance.
Fast response times are an industry requirement. Only measurement accuracy does not meet demand – sensors need to quickly detect environmental changes and trigger operations in the application to maintain the desired level.
For example, weather balloons are the mainstay of modern weather forecasting. If you don't know the situation in the upper atmosphere, it is almost impossible to predict the weather. Perhaps the sea level is sunny and calm, but at 18,000 feet (5,486 meters), a weak storm may soon turn into a more dangerous situation. Meteorologists can closely monitor the formation of storms by regularly sending balloon sets to measure air over the air. HTU sensors – due to their fast response time – will accurately detect the relative humidity of different atmospheres. This helps predict these weather changes and avoids any alarm conditions, such as sending an error message when passing through the cloud.
Another related example is an electrical appliance application. When you open the refrigerator door in the summer, hot air enters the refrigerator, forming condensation and increasing the relative humidity, causing frost or freezing of the interior wall. TE's humidity chip architecture delivers industry-leading response times of 2 seconds. Fast response times allow the system to react in real time to avoid this. In other words, it prevents freezing from forming, which means the defrost cycle will be shorter and energy efficient.
Challenge 3 - Applications exposed to environmental changes must not affect measurementsSystem performance must not be affected after exposure to extreme conditions.
Low hysteresis is a key capability. Even after an important condensation event, the sensor needs to maintain accurate measurement performance.
For example, when the humidity returns to the initial point, the appliance drying cycle will automatically stop. Low hysteresis will allow the drying cycle to be stopped while the "internal" contents are dry without damage.
In another example of an HVAC system, HVAC system performance will be exactly the same as hot summer even when exposed to extreme high humidity for extended periods in the fall and winter seasons.
Challenge 4 - Considering the wide range of sensors, they must be easy to use and easy to incorporate into OEM SMD assembly linesToday, OEMs innovate their products with intelligent solutions such as sensors, but they need to integrate them into the production process without negative consequences.
TE's HTU sensors can be integrated into a standardized, fully calibrated package and integrated into a printed circuit board without any restrictions.
If you're looking to upgrade, or if you want to upgrade your next-generation system to a smarter application without having to drastically change your assembly process, try TE's HTU sensor, which is compatible with the standard SMD assembly process.
Meeting these demanding challengesTE Connectivity believes that technological improvements will help shape the future of energy efficiency. To this end, our humidity and temperature combination sensor (HTU20/HTU21) will make a big difference. The right sensor solution can significantly optimize your application. With more than 20 years of experience, we offer a combination of humidity and temperature sensors that deliver leading response times, measurement accuracy and long-lasting performance even under extreme conditions and conditions.
Available evaluation boardAn evaluation board is available for Adafruit's HTU21DF. The evaluation board allows you to test all the features of the HTU21DF to determine if it will be used in your system.
Figure 2: Adafruit's HTU21DF evaluation board.
If you already have an expandable system board, there are a variety of expansion boards that can be integrated into the following platforms: Arduino, Grove, mikroBUSTM ClickTM, PICtailTM Plus, PmodTM, Raspberry Pi, and Xplained Pro.
in conclusionCompared to competitive solutions, TE's HTU senses true relative humidity and temperature to deliver best-in-class performance and superior value. Whether you're doing new engineering or optimizing existing designs in consumer applications, TE's humidity and temperature sensors provide a high-quality, ready-to-connect solution that delivers the accuracy and reliability you need.
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