Humidity and Moisture
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.
Measuring indoor relative humidity is fairly easy and inexpensive. There are several models of sensors to choose from that works with the ezeio system. Indoor RH monitoring is valuable in HVAC applicatons, and to control window glass heating on refrigerators in humid environments.
Indoor humidity sensing can also be important in sensitive building, like museums, to avoid decay or damage.
In greenhouse applications, and for outside monitoring the sensors need to be protected against direct exposure to water. These types of sensors also have a little wider range than the typical indoor sensor.
Moisture sensors need to be in direct contact with the soil. Some models measure the conductivity of the soil to detect the amount of water it contains. Other models use capacitive sensing. It is important to understand the composition of the soil to make good use of the metered data.
Soil moisture sensors can be used to track irrigation needs, or even to directly control the irrigation system through the ezeio controller.