Apogee Instruments SM-500 Full-Spectrum Guardian CEA Multi-Sensor Monitor – 5 Meter Pigtail

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 (Apogee Instruments AM-270) or hung by thin wires, the SM-500 model is designed to integrate with and be powered by a Modbus controller. Though, data remains accessible via Bluetooth connectivity even when powered via Modbus controller. To use this as a stand alone Bluetooth-only datalogger, please see the Apogee Instruments SM-500-AC model option, which includes a power cable for use with a standard 120VAC wall outlet. 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. 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 €œfluid entrainment€? principle. Additionally, a quantum sensor is mounted on the top of the shield to measure PAR. Apogee Instruments SM-500 Specs Calibration Uncertainty: ± 5 % Long-term drift (non-stability): Less than 2 % per year Measurement Repeatability: Less than 0.5 % Measurement Range: 0 to 4000 µmol m-2 s-1 Spectral Range: 389 to 692 nm Field of View: 180° Directional Response: ± 5 % at 75° zenith angles Azimuth Angle: Less than 0.5 % Tilt Error: Less than 0.5 % Non-linearity: Less than 1 % (up to 4000 µmol m-2 s-1) Response Time: Less than 1 ms Temperature Response: -0.11 % ± 0.04 % per C Uncertainty in Daily Total: Less than 5 % Operating Environment: -40 to 60 C with 0 to 95 % relative humidity Housing: White ASA housing CO2: Range 0-2000; ± 50 ppm + 2 % Temperature: ± 0.2 C Humidity: Range 0-95 %; ± 3 % 20-80 % Vapor Pressure Deficit (25 C): ± 0.08 kPa Barometric Pressure: 70 to 110 kPa Connectivity: Modbus (RS232 and RS485) and Bluetooth Power Requirements: 5-32 V DC; Typical: 100 mA; Peak: 500 mA Data Storage Capacity: 9 months of 1 min data IP Rating: IP53 rating for harsh environments Dimensions: 105 mm diameter, 157 mm height Mass: 392 g Cable: 5 meter, 6 conductor, shielded wire with TPR jacket and M8 connector Warranty: 4 years against defects in materials and workmanship Manufactured: Assembled in the USA