Various Types of the Humidity Sensor

When it comes to devices and gadgets that are used in order to monitor and control indoor climate, people should not overlook the humidity sensor. Humidity sensors are used in order to monitor humidity, which is the amount of water vapors that are present in the air.

Various Humidity Terms

There are actually a variety of different terminologies when it comes to calculating and monitoring the humidity content in air. Here are just a few:

  • Absolute Humidity: This refers to the ratio of water to air. It is the total amount of water vapors that are in the air at any given time.
  • Relative Humidity: This refers to the totally quantity of air that is in the form of gaseous vapors to the total quantity of the moisture that the air can absorb in it.
  • Specify Humidity: This term means the specified amount of water vapors in a specified amount of air.

Typically humidity is measured by gram per cubic centimeter or g/cm3. The humidity content within the atmosphere is then measured by the humidity sensor.

There are a variety of different sensors that can be used when it comes to measuring humidity. Here are just a few types:

  • Psychrometer/Hygrometer: Using this system, a pair of almost identical thermometers are used. One is kept wet while the other one is kept dry. The differences between them or their values are then recorded. The moisture that is within the air is calculated by the device.
  • Bulk Poly Resistive Sensor: This sensor is an electric type of humidity sensor that uses resistors and capacitors. There is a grid of electrodes that are interlocked and placed onto an insulating substrate, or a humidity sensitive salt. The humidity is calculated after a brief measuring process.
  • Capacitive Sensor: This type of humidity monitoring system, electrodes are placed into a parallel position on a substrate. Dielectric material within the center of the electrodes will absorb the water from the air. This type of sensor can be used even at high altitudes and is efficient to calculate and determine low humidity values.

There are many other humidity sensors as well as controllers out there to choose from. Some include the bang-bang controller, the proportional controller, the proportional-integral-derivative controller or PID controller.

These controllers and sensors will help to control and maintain the humidity levels within residential or industrial buildings. They are also beneficial because they will help to maintain the humidity levels of electric equipment rooms.

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