{"product_id":"apogee-instruments-sm-500-full-spectrum-guardian-cea-multi-sensor-monitor","title":"Apogee Instruments SM-500 Full-Spectrum Guardian CEA Multi-Sensor Monitor","description":"\u003cdiv class=\"container\"\u003e         \n    \u003cp\u003e\n        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).  \n    \u003c\/p\u003e\n    \u003cp\u003e\n        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. \n    \u003c\/p\u003e\n    \u003cp\u003e\n        \u003ci\u003eTo 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.\u003c\/i\u003e\n    \u003c\/p\u003e\n    \u003cp\u003e\nThe 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.  \n    \u003c\/p\u003e\n    \u003chr\u003e\n        \u003cp\u003e\u003cstrong\u003eApogee Instruments SM-500 Specs\u003c\/strong\u003e\u003c\/p\u003e\n    \u003cul style=\"list-style-type: none; padding-left: 18px;\"\u003e\n      \u003cli\u003e\n\u003cstrong\u003eCalibration Uncertainty\u003c\/strong\u003e: ± 5 %\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eLong-term drift (non-stability)\u003c\/strong\u003e: Less than 2 % per year\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eMeasurement Repeatability\u003c\/strong\u003e: Less than 0.5 %\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eMeasurement Range\u003c\/strong\u003e: 0 to 4000 µmol m-2 s-1\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eSpectral Range\u003c\/strong\u003e: 389 to 692 nm\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eField of View\u003c\/strong\u003e: 180°\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eDirectional Response\u003c\/strong\u003e: ± 5 % at 75° zenith angles\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eAzimuth Angle\u003c\/strong\u003e: Less than 0.5 %\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eTilt Error\u003c\/strong\u003e: Less than 0.5 %\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eNon-linearity\u003c\/strong\u003e: Less than 1 % (up to 4000 µmol m-2 s-1)\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eResponse Time\u003c\/strong\u003e: Less than 1 ms\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eTemperature Response\u003c\/strong\u003e: -0.11 % ± 0.04 % per C\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eUncertainty in Daily Total\u003c\/strong\u003e: Less than 5 %\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eOperating Environment\u003c\/strong\u003e: -40 to 60 C with 0 to 95 % relative humidity\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eHousing\u003c\/strong\u003e: White ASA housing\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eCO2\u003c\/strong\u003e: Range 0-2000; ± 50 ppm + 2 %\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eTemperature\u003c\/strong\u003e: ± 0.2 C\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eHumidity\u003c\/strong\u003e: Range 0-95 %; ± 3 % 20-80 %\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eVapor Pressure Deficit (25 C)\u003c\/strong\u003e: ± 0.08 kPa\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eBarometric Pressure\u003c\/strong\u003e: 70 to 110 kPa\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eConnectivity\u003c\/strong\u003e: Modbus (RS232 and RS485) and Bluetooth\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003ePower Requirements\u003c\/strong\u003e: 5-32 V DC; Typical: 100 mA; Peak: 500 mA\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eData Storage Capacity\u003c\/strong\u003e: 9 months of 1 min data\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eIP Rating\u003c\/strong\u003e: IP53 rating for harsh environments\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eDimensions\u003c\/strong\u003e: 105 mm diameter, 157 mm height\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eMass\u003c\/strong\u003e: 392 g\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eCable\u003c\/strong\u003e: 5 meter, 6 conductor, shielded wire with TPR jacket and M8 connector\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eWarranty\u003c\/strong\u003e: 4 years against defects in materials and workmanship\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eManufactured\u003c\/strong\u003e: Assembled in the USA\u003c\/li\u003e\n    \u003c\/ul\u003e\n\n\u003c\/div\u003e","brand":"Apogee Instruments","offers":[{"title":"5 Meter Pigtail","offer_id":51065535365398,"sku":"SM-500","price":1415.53,"currency_code":"USD","in_stock":true},{"title":"5 Meter USB Cable and AC Power Brick","offer_id":51065554567446,"sku":"SM-500-AC","price":1415.53,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0910\/5912\/6550\/files\/SM-500_1.webp?v=1772228913","url":"https:\/\/hydrobuilder.com\/products\/apogee-instruments-sm-500-full-spectrum-guardian-cea-multi-sensor-monitor","provider":"Hydrobuilder","version":"1.0","type":"link"}