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Humidity Sensor

Humidity Sensor. Presented by: Key Kai Wong. Outline. What is Relative Humidity Manufacturers of Humidity Sensor Humidity Sensor from Honeywell ( HIH series) Humidity Sensor from Sensirion ( SHT Series) Comparision.. Conclusion Reference. What is Relative Humidity (RH).

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Humidity Sensor

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  1. Humidity Sensor Presented by: Key Kai Wong

  2. Outline • What is Relative Humidity • Manufacturers of Humidity Sensor • Humidity Sensor from Honeywell ( HIH series) • Humidity Sensor from Sensirion ( SHT Series) • Comparision.. • Conclusion • Reference

  3. What is Relative Humidity (RH) Measurement - Relative humidity (RH) is the amount of water vapor in the air compared with the amount of vapor needed to make the air saturated at the air's current temperature Example: At 3 p.m. the air has 9 grams of water vapor per cubic meter of air. We divide 9 by 30 and multiply by 100 to get a relative humidity of 30%

  4. Water vapor air can hold in degrees C 30 degrees 30 grams per cubic meter of air 20 degrees 17 grams per cubic meter of air 10 degrees 9 grams per cubic meter of air .

  5. Honeywell ( HIH series ) Sensirion ( SHT Series ) Manufacturers of Humidity Sensor

  6. Humidity Sensor from Honeywell ( HIH series) • Packages are chemically resistant • operate in ranges of -40 °C to 85 °C ( -40 °F to 185 °F) • Response time -15 sec in slowly moving air at 25 °C • Low power design – 200 microA @ 5 Vdc • Operating volatge 4 – 5.8 v • On-chip signal processing ensures linear voltage output versus %RH. • $35 - $40 per unit price

  7. HIH-3610 Series

  8. Humidity Sensor from Sensirion( SHT Series ) • 2 sensors for relative humidity & temperature • Very easy-to-use due to calibration & digital 2-wire interface • Calibrated & digital output (2-wire interface) • Fast response time < 4 sec. • Temp. accuracy: +/- 0.5°C @ 25 °C • Low power consumption (typ. 30 µW) • Operating Voltage 2.8 - 5.5v • Cost $18 - $24 per unit price

  9. Series interface

  10. Sensirion ( SHT Series ) Fast response time < 4 sec. Low power consumption (typ. 30 µW) Operating Voltage 2.8 - 5.5v Cost $18 - $24 per unit price 2 sensors for relative humidity & temperature Very easy-to-use due to calibration & digital 2-wire interface Calibrated & digital output (2-wire interface) Temp. accuracy: +/- 0.5°C @ 25 °C Honeywell ( HIH series ) Response time -15 sec in slowly moving air at 25 °C Low power design – 200 microA @ 5 Vdc Operating volatge 4 – 5.8 v $35 - $40 per unit price On-chip signal processing ensures linear voltage output versus %RH. Comparision..

  11. Conclusion After considering the aspect of the operating voltage, cost, response time and the output of the sensor. Sensor SHT series is more suitable for our application.

  12. References • Honeywell http://content.honeywell.com/sensing/prodinfo/humiditymoisture/#applications • Sensirion http://www.sensirion.com/en/sensors/humidity/default.htm • USToday http://www.usatoday.com/weather/wrelhum.htm

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