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