Humidity sensors offer high reliability in harsh environments

June 30, 2021 // By Jean-Pierre Joosting
Humidity sensors provide high reliability in harsh environments
Texas Instruments has introduced the first devices in a new family of humidity sensors that are offered as providing the industry's highest reliability and accuracy and the lowest power consumption - along with built-in protection of sensing elements.

The HDC3020 and HDC3020-Q1, says the company, will allow engineers to create more reliable industrial and automotive systems that withstand potential damage caused by moisture, and react as needed to changing water vapor conditions over time.

Moisture affects system performance and product longevity of applications in vehicles, appliances and medical equipment. From extending the life of produce during transport and storage, to keeping automotive cameras clear of fog, to controlling air quality and flow in buildings, the need for improved reliability and safer, more comfortable environments has increased the adoption of relative humidity (RH) sensors.

Offering improved relative humidity measurement accuracy with reduced long-term error, when compared to existing RH sensors, the HDC3020 and HDC3020-Q1 preserve data integrity under stress conditions and are the industry's first to provide integrated correction to adapt to drift caused by natural aging, environmental stress or interactions with contaminants.

The HDC3020 and HDC3020-Q1 humidity sensors achieve lower drift in extreme conditions than competing devices, with less than 0.21% RH accuracy drift per year and less than 5% RH drift from temperature and humidity stress (tested up to 85% RH and 85°C). This sustained accuracy enables longer system lifetimes, eliminating the need to frequently replace or recalibrate the sensor.

When exposed to stress or contaminants, the sensors also provide a second line of defense, where even a small accuracy drift from the sensor's time-zero specification can be removed using integrated drift correction technology. Low drift is especially important in long-life applications, because it enables better performance and greater reliability over time.

Increase system efficiency with high accuracy

The HDC3020 and HDC3020-Q1 provide the highest accuracy – verified with a procedure traceable to the National Institute of Standards and Technology – across the full supply voltage of 1.62 V to 5.5 V and the widest temperature and humidity range at ±1.5% RH. This high accuracy enables more precise control of a system, increasing efficiency by ensuring that the


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