PESSL INSTRUMENTS PAR QUANTUM
Photosynthetically Active Radiation (PAR) is typically measured as Photosynthetic Photon Flux Density (PPFD), which has units of quanta (photons) per unit of time per unit of surface. The units most commonly used are micromoles of quanta per second per square meter (μmol s-1 m-2). Plant scientists, horticulturists, ecologists, and other environmental scientists use MD507D Quantum Sensors to accurately measure this variable.
SENSOR | PESSL INSTRUMENTS PAR QUANTUM |
Part No. | IM507D IM5071D IM5079D |
Technical specifications
Sensor | EG&G VACTEC VTB1012B |
Calibration | Calibration against LI-190SZ under daylight Absolute difference max. 5%, typical 3% |
Linearity | Maximum deviation of 1% up to 3000 W/m² |
Stability | 2% change over a 1 year period |
Response Time | 150 ms |
Temperature dependency | 0.15% per °C |
Cosines correction | Sensor corrects up to 80° degrees |
Azimuth | 1% error over 360 degree at 45 degree elevation |
Working temperature | -20°C to 65°C |
Relative Humidity | 0 to 100% |
Sensor | Photodiode |
Housing | Weatherproof PAS case with acrylic diffuser, stainless steel hardware |
Size | 35 mm diameter, 45 mm height |
Weight | 114g |
Evaluation | PWM: 0-80% duty cycle. = 0–20 kJ/m² |

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