HIH8121-021-001 Sensors, Transducers

Series:	HumidIcon™, HIH-8000
Packaging:	Tape & Reel (TR)
Part Status:	Active
Sensor Type:	Humidity, Temperature
Humidity Range:	0 ~ 100% RH
Output Type:	I²C
Output:	14b
Accuracy:	±2% RH
Response Time:	6s
Sensitivity:	--
Voltage - Supply:	2.3 V ~ 5.5 V
Mounting Type:	Through Hole
Operating Temperature:	-40°C ~ 125°C
Package / Case:	4-SIP Module
Supplier Device Package:	4-SIP

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Humidity and moisture sensors are devices used to measure humidity and moisture in the environment. The HIH8121-021-001 is a humidity and moisture sensor developed by Honeywell. This article will discuss the application field and working principle of the HIH8121-021-001.The HIH8121-021-001 is a two-wire, analog output, capacitive humidity and temperature sensor that can recommend itself to a wide range of applications in home automation, HVAC, and industrial control. This sensor features a ±2.5% accuracy, an operating temperature range of -40 to +125°C, and a measurement range of 0 to 100% humidity.The HIH8121-021-001 is primarily intended for indoor applications, but it can also be used in outdoor environments if the device is properly protected from the elements. Applications that require monitoring the moisture content of air or liquids, such as dehumidifiers, humidifiers, air conditioners, and evaporative coolers, can all benefit from the use of this sensor. The HIH8121-021-001 can also be used in systems that require monitoring of relative humidity, such as greenhouses, cultivation systems, fermentation processes, and food production.The HIH8121-021-001 uses a capacitive measurement principle. This measurement principle is based on the fact that different materials will hold different amounts of electrical charge. The sensor has two layers of electrodes – a sensing capacitance and a reference capacitance. The sensing capacitance is exposed to the environment and is affected by the humidity. As the humidity of the air changes, this affects the electrical charge in the sensing capacitance, which in turn changes the capacitance between the two electrodes. The reference capacitance remains constant, providing a reference for detecting changes in humidity.The AC signal generated by the HIH8121-021-001 is then sent to an ADC, and the output is processed into a linear voltage from 0 to 5 Volts. This voltage can then be used to determine the relative humidity of the environment. The sensor is stable and accurate over a wide range of environmental conditions, and it requires no external components for its operation.In conclusion, the HIH8121-021-001 is an accurate and reliable humidity and moisture sensor that is capable of operating in a wide range of environments. It can be used in applications such as home automation, HVAC, and industrial control. This sensor uses a capacitive measurement principle and requires no external components for its operation. The output of this sensor is a linear voltage from 0 to 5 Volts that can be used to determine the relative humidity of the environment.

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