A-THP Ambient Temperature Humidity VPD Sensor

A-THP Ambient Temperature, Humidity & VPD Sensor is individually factory-calibrated. It integrates temperature,humidity and online Vapor Pressure Deficit (VPD) calculation. Designed for smart agricultural greenhouses, canopy monitoring, greenhouse monitoring,smart agriculture,reference evapotranspiration calculations,etc.

VPD Sensor provides real-time VPD monitoring to directly guide irrigation, ventilation, and heating systems. It helps users optimize crop transpiration, prevent disease outbreaks, and achieve precision environmental management.

Technical Parameters

The Importance of VPD

1.Crop Physiology: When VPD is too low (air too humid), stomata close, inhibiting photosynthesis. When VPD is too high (air too dry), water evaporation accelerates, leading to wilting or nutrient uptake disorders.
2.Disease Prevention & Control: High humidity combined with suitable temperatures promotes mold growth (e.g., gray mold). A low VPD reading serves as an early warning signal.
3.Energy-Saving Control: Adjusting dehumidifiers or fans based on VPD is more precise and energy-efficient than relying solely on temperature control.

Real impact from Aroya：

Yield increases of 15–30%
Growers who optimize VPD consistently report higher grams-per-watt and denser buds at harvest.

Dramatically reduced disease pressure
Maintaining VPD below 1.0 kPa during propagation eliminates most conditions for powdery mildew and botrytis.

Faster canopy development
‍Optimal VPD in veg means faster internode development and a more uniform canopy — reducing veg time by days.

Better terpene retention
‍Dialing in late-flower VPD between 1.2–1.6 kPa supports maximum terpene expression without sacrificing density.