New Digital Humidity and Temperature Sensors

In April 2010 Sensirion (Switzerland) started serial production of the SHT21, the standard version of its new generation of digital humidity and temperature sensors. Now the sensor manufacturer is launching a high-precision version for applications with stringent accuracy requirements. The SHT25 rounds out the familiy of digital humidity sensors, in the same way as the high-end versions of the SHT1x and SHT7x series.

The SHT25 precisely measures relative humidity over a range of 0 to 100% RH and temperature over a range of -40 to +125°C. It achieves a typical accuracy of 1.8% RH (at 25°C) for relative humidity and ±0.2°C for temperature. For both quantities, the typical tolerance is small even at the limits of the measuring range. The maximum tolerance is 2% relative humidity or ±0.3°C over a wide range, as shown by the adjacent figures. This enables the new SHT25 to achieve significantly better accuracy, especially for temperature measurements.

The SHT25 is fully calibrated and exactly matches the other specifications of the already successful SHT21 version. Among other things, the reflow-solderable SHT25 has an I2C interface and features outstanding stability along with extremely low power consumption.