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Light sensors

PESSL INSTRUMENTS PAR QUANTUM

PI_Par quantum

Order number: 600078 / 900005

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.

FEATURE VALUE
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
Operating temperature range
-20°C to 65°C
Operating relative humidity range
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

PESSL INSTRUMENTS PYRANOMETER

PI_Pyranometer

Order number: 600021 / 900002 (µMETOS), 600035 / 900000 (IMT)

The IM506D Pyranometer is designed for field measurements of global solar radiation in agricultural, meteorological and solar energy studies. In clear, unobstructed daylight, the Pessl Instruments pyranometer has favourable results compared to the first class thermopile-type pyranometers, but is priced at just a fraction of the cost.

FEATURE VALUE
Sensor
LI-200SZ
Calibration
Calibration against Kipp and Zonen CMP3 under daylight. Absolute error max. 5%, typically 3%
Stability
2% drift on 2-year use
Time to measure
10 µs
Temperature dependency
0.15% per °C
Cosines correction
Sensor corrects up to 80° degrees
Azimuth
1% error over 360 degree at 45 degree elevation
Operating temperature range
-20°C to 65°C
Operating relative humidity range
0 to 100%
Sensor
Photodiode
Housing
Weatherproof PAS case with acrylic diffuser, stainless steel hardware
Size
35 mm diameter, 45 mm height
Weight
114 g
Evaluation
Pulse Wide Modulation 0-80% = 0-2000 W/m²
Spectral range
300-1100 nm
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