Digital Humidity Sensors

HYT 221 Splash-Proof Digital Humidity Element

HYT 221 is a digital humidity element in a round stainless steel casing which can be easily fitted into housing openings and can be sealed against the wall with the use of an O-ring. In combination with the waterproof membrane filter, it results in an assembly that is splash waterproof and enables a sealed housing construction while providing high dynamic responsiveness.

Like all products in the Hygrochip line, integrated signal processing, and I2C compatible interface is standard. Outstanding accuracy with on-chip calibration and excellent resistance to chemicals and dew formation is part of this model.


  • Measurement range of 0 to 100% rH, -40°C to 125°C
  • Accuracy ±1.8% rH and ±0.2°C (HYT 271-H)
  • I2C interface
  • Splash waterproof with protection filter
  • High chemical resistance
  • Dew formation resistant
  • Low operating voltage of 2.7 to 5.5V
  • Miniature construction of 5 x 7 mm
  • SIL-connections, plug-in type
  • RoHS conformance

Technical Features

Measuring Principle: Capacitive polymer humidity sensor
Humidity Range: 0-100% relative humidity
Humidity Accuracy:

±1.8% rH

Humidity Resolution: 0.02% rH
Temperature Measurement Range: -40 to +125°C
Temperature Accuracy: ±0.2°C
Temperature Resolution 0.015°C
Hysteresis: ±1% rh
Response Time: less than 12 sec
Digital Interface: I2C, Address0x28 Alternative address
Dimensions: 15.3 x 10.2 x 5.3 mm
Connection: SIL, plug-in type, RM 1.27 mm
Meets RoHS conformity: Yes


  • Meteorology
  • Industrial drying systems
  • Medical devices
  • Aviation
  • Extreme sports equipment