Humidity and Moisture

Humidity tells us how much water vapor is in the air. Relative humidity is the percentage of how much vapor the air holds of the maximum amount it can hold at a specific temperature.


Moisture usually refers to the water content in soil, and is expressed as a ratio between dry (0) and complete saturation.

In many situations, measuring and controlling humidity and moisture is important. Animals and plants can be sensitive to different humidity levels, and too high (or low) humidity can cause problems with machines and electronics.

Some applications where the ezeio is used to monitor humidity includes:

  • Air quality monitoring – sensing in conference rooms, exhibit halls, museums.

  • Economizer control – monitor in/outside air and select the optimal mixture for cooling.

  • Greenhouses – control and monitor humidity for optimal growth conditions

  • Weather stations – log and report humidity over time from multiple sites.

  • Dew point monitoring/ASH control – limit fog build-up on refrigerator glass doors.

  • Irrigation monitoring – tracking soil moisture to control and record irrigation requirements


There are several models of humidity sensors that work with the ezeio system. Some are designed for harsh environments, and are protected from direct exposure to water. There are specially designed sensors for mounting on HVAC ducts and some are for wall-mount.


Moisture sensors also exist in many different forms. The output can often easily be adapted to work with the ezeio controller.

> Indoor Humidity /RH sensing

> Outside/industrial sensing

> Moisture sensors


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