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Apogee SM-500 Full Spectrum Guardian CEA Multi-Sensor Environmental Monitor

Apogee Instruments  |  SKU: SM-500
$1,23900 $1,24900
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Description:

The Apogee Guardian is an elegant device that provides accurate measurements of important indoor environmental parameters. The SM-500 is a user-friendly datalogger with multiple integrated sensors to measure PAR, air temperature, humidity, vapor pressure deficit and dewpoint, CO2 concentration, barometric pressure, and daily light integral* and photoperiod* (*only accessible via Bluetooth). 

Graphical summaries of these measurements can be downloaded to dataloggers via Modbus or smartphones via Bluetooth with the Apogee Connect app (iOS/Android). While the SM-500 can take measurements as a stand-alone device mounted to a mast using the AM-270 mounting bracket or hung by thin wires, it can also integrate into systems for greenhouses, grow rooms, and vertical farms via Modbus or Bluetooth. The SM-500 is constructed from high-quality ASA plastic with low thermal conductivity and a gloss white finish in selective areas to lower emissivity.

Features:

The Guardian is filled with foam to provide additional thermal insulation. The internal airway utilizes a small venturi constriction to maximize airflow efficiency over the thermistor, which minimizes the thermal boundary layer’s influence on temperature measurements. Simultaneously, a separate module used to measure CO2, humidity, and pressure is aspirated by a passive, low velocity airstream using a “fluid entrainment” principle. Additionally, a quantum sensor is mounted on the top of the shield to measure PAR. The Guardian comes in two model versions: the SM-500 and SM-600. The SM-500 and SM-600 models are identical in all ways (size, function, and appearance) except for the embedded light sensor. The SM-600 sensor measures extended photosynthetically active radiation (ePAR), while the SM-500 measures PAR (400-700 nm). For the ePAR option, please see the SM-600 model.

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.

Data Collection and Display

Graphical summaries of environmental measurements can be downloaded to dataloggers via Modbus or smartphones via Bluetooth with the ApogeeConnect app (iOS/Android). While the Guardian can take measurements as a stand-alone device mounted to a mast or hung by thin wires, it can also integrate into systems for greenhouses, grow rooms, and vertical farms via Modbus or Bluetooth. Bluetooth and Modbus connectivity can be simultaneous, allowing for in-person spot checks and supplementary logging even while connected to a larger controller system.

Rugged Design

The Guardian is constructed from high-quality ASA plastic with low thermal conductivity and a gloss white finish in selective areas to lower emissivity with an IP rating of IP53. The Guardian is filled with foam to provide additional thermal insulation. It can operate in 0-95% non-condensing relative humidity. Additionally, a quantum sensor is mounted on the top of the shield to measure PAR (SM-500) or ePAR (SM-600). The internal airway utilizes a small venturi constriction to maximize airflow efficiency over the thermistor, which minimizes the thermal boundary layer’s influence on temperature measurements. Simultaneously, a separate module used to measure CO2, humidity, and pressure is aspirated by a passive, low velocity airstream using a “fluid entrainment” principle.

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.

Calibration

To ensure accuracy, each embedded quantum sensor located in a Guardian is carefully calibrated in controlled conditions and traceable to NIST reference standards.

Warranty and Support

All Apogee products are backed by an industry-leading four year warranty and outstanding customer support.

Downloads:
Apogee SM-500 Guardian User Manual
Apogee SM-500 Guardian Specification Sheet
Apogee SM-500 Guardian Quick Start Guide
Apogee SM-500 Guardian Technical Drawing
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