{"title":"RS485 Photosynthetically Active Radiation (PAR) Sensor (400-700nm)","handle":"rs485-photosynthetically-active-radiation-par-sensor-400-700nm","url":"/products/rs485-photosynthetically-active-radiation-par-sensor-400-700nm","description":"The RS485 PAR Sensor measures photosynthetically active radiation in the 400–700 nm wavelength range — the light spectrum that plants use for photosynthesis. It converts incident radiation into a signal proportional to light intensity, with cosine-corrected angular response for accurate readings at varying sun angles.\n\nBuilt for outdoor deployment with an IP67-rated aluminium housing and a specially treated dust cover, this sensor delivers reliable measurements in harsh environments. It communicates via RS485 using the Modbus-RTU protocol and operates on a wide 5–30V DC supply, making it easy to integrate with Arduino and other platforms.\n\nKey Features\n\n\n400–700 nm Spectral Range – Measures the full PAR band used by plants for photosynthesis\n\n0–2,500 µmol/m²·s Range – Covers low-light to full-sun conditions\n\n±5% Accuracy – At 1,000 µmol/m²·s, 550 nm, 60% RH, 25°C\n\n1 µmol/m²·s Resolution – Fine-grained measurement for research applications\n\n10 µs Response Time – Near-instantaneous readings\n\nCosine Corrected – ≤±10% cosine response for accurate angular measurements\n\nRS485 Modbus-RTU – Standard industrial communication protocol\n\nIP67 Rated – Dust-tight and waterproof for outdoor installations\n\n5–30V DC Supply – Wide voltage range, <10 mA working current\n\n\nSpecifications\n\n\nMeasurement Range: 0–2,500 µmol/m²·s\n\nWavelength Range: 400–700 nm\n\nAccuracy: ±5%\n\nResolution: 1 µmol/m²·s\n\nNon-Linearity: <±1%\n\nAnnual Stability: ≤±2%\n\nOperating Temperature: -25°C to +60°C\n\nProtection Level: IP67\n\nSensor Cable Length: 20 cm\n\nAdapter Cable Length: 70 cm\n\n\nIdeal For\n\nAgricultural monitoring and crop growth optimisation\nGreenhouse light management\nPhotovoltaic and solar radiation monitoring\nEnvironmental and ecological research\n\n\nPackage Contents\n\n1× RS485 PAR sensor\n1× Adapter cable\n1× Screw package\n\n\nResources\n\nProduct Wiki (Documentation, Dimensional Drawing, Protocol, Tutorial)\n","vendor":"DFRobot","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":485,"title":"Default Title","sku":"DF-SEN0641","mpn":"SEN0641","price":110.0,"compare_at_price":0.0,"on_sale":false,"in_stock":true,"available_quantity":112,"option1":"Default Title"}]}