The Apogee Guardian is an elegant device that provides accurate measurements of important indoor environmental parameters.
The Guardian is a user-friendly datalogger with multiple integrated sensors to measure PAR (SM-500) or ePAR (SM-600), air temperature, humidity, vapor pressure deficit and dewpoint, CO2 concentration, barometric pressure, daily light integral, and photoperiod.
Two Models
- SM-500: Full-spectrum is accurate for measuring 389-692 nm under all light sources including LEDs.
- SM-600: ePAR is accurate for measuring the newly discovered extended PAR (ePAR) 383-757 nm range under all light sources.
Accurate, Stable Measurements
Sensors are cosine-corrected to maintain accuracy when radiation comes from low angles (± 5 % at 75° zenith angle). Long-term non-stability determined from multiple sensors in accelerated aging test and field conditions is less than 2 % per year.
Typical Applications
Accurate environmental measurements in controlled environments, such as greenhouses and growth chambers, help aid in decision making and environment management. Monitoring PAR or ePAR intensities, daily light integral and photoperiod, CO2 concentration, barometric pressure, and other parameters is critical for plant health, growth rate, photosynthesis levels, plant morphology, and crop steering. Required levels vary greatly by species and should be measured and controlled for optimum specimen health. |
