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pdf on humidity sensor seminar topic

Single-Chip Relative Humidity and Temperature Sensors
Silicon Labs’ Si70xx state of the art relative humidity and temperature sensors utilize proven techniques for measuring humidity using polymer dielectric film along with CMOS mixed signal integrated circuits. These monolithic ICs combine fully calibrated humidity and temperature sensing elements, an I2C or PWM interface and on-chip signal conditioning into a compact, rugged and reliable package.

Humidity sensors from Measurement Specialties are designed to improve performance, reduce energy consumption, and increase safety. In any environment where temperature affects performance, compensating for humidity should also be considered. Typical applications for analog humidity sensors and digital humidity sensors include automotive, appliances, HVAC, and medical.

Humidity Sensors & HumidIcon™ Line Guide

humidity sensors
Performance and reliability. At Honeywell Sensing and Control (S&C), each sensor is designed to provide enhanced stability, reliability and sensitivity.

Honeywell Sensing and Control offers a full line of humidity sensors to meet your needs from our premier Honeywell HumidIcon™ combined Digital Humidity / Temperature sensors to our relative humidity absorption-based humidity sensor products.

Honeywell HumidIcon Digital Humidity/Temperature sensors offer a range of accuracies from ±1.7 %RH to ±4.5 %RH, wide operating temperature ranges and low hysteresis.

All Honeywell Sensing and Control humidity sensors are configured with integrated circuitry to provide on-chip signal conditioning offered on all products.

Potential applications for Honeywell humidity or humidity / temperature sensors are as diverse as heating, ventilation and air conditioning equipment (HVAC), refrigeration, office automation, and medical equipment.
Industrial Applications:
• HVAC/R - Heating, ventilation, air conditioning, refrigeration
• Air compressors
• Meteorology / weather stations
• Humidifiers and dehumidifiers
• Telecom cabinets
• Incubators/microenvironments
• Industrial drying equipment
• Hygrometers, consumer goods
• Battery-powered systems
• OEM assemblies
Medical Equipment Applications:
• Respiratory therapy
• Incubators/microenvironments

Humidity sensor - HH10D
Description: The HH10D relative humidity sensor module is comprised of a capacitive type humidity sensor, a CMOS capacitor to frequency converter and an EEPROM used to hold the calibration factors. Due to the characteristics of capacitor type humidity sensor, the system can respond to humidity change very quickly. Each sensor is calibrated twice at two different accurate humidity chambers and two unique sensor related coefficients are stored onto the EEPROM on the module.

Features:
I2C interface
2.7-3.3V Input
150uA current consumption
-10 to 60 degrees C temperature range
+-3% accuracy

Humidity Sensors
ST’s digital humidity and temperature sensor is based on a planar capacitance technology that integrates the humidity and temperature sensors in the sensing element.Using our extensive experience in reading small capacitance variations in accelerometers and gyroscopes, ST has developed a differential capacitance sensing element that, when combined with the temperature sensor, provides the relative humidity. It is easy to use with the sensor, signal processing circuitry, onboard calibration and proprietary algorithm integrated in a single package. The small size and low power consumption is ideal for use cases in consumer mobile, smart home (home appliances and HVAC), and storage and logistic applications.


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