PAR Line Quantum Sensor
Photosynthetically Active Radiation or PAR light lies in the range 400-700nm and is the part of the sun’s spectrum used by plants for photosynthesis. The PAR line quantum sensor consists of 33 individual sensors evenly spaced along an 850mm length. The design and diffusing cover ensures the average of PAR light falling along the whole length is measured. Measuring light profiles with a single sensor under canopies or in growth rooms can introduce errors, as the light is usually not constant or not uniform over the whole area. The Skye PAR line quantum sensor instantaneously measures an average of the light falling on its entire length, hence minimising these errors. The line sensor is often used together with a standard Skye PAR quantum sensor which measures the incident PAR light falling on the plant surface, whilst the line quantum sensor is usually placed within or beneath the plant canopy.
The percentage of light transmission through the canopy can be instantly read using the SpectroSense2 handheld display meter. This sensor can also be used with the SpectroSense2+GPS meter for mapping via plot location or GPS and with the SpectroSense2+ for Leaf Area Index (LAI) Measurements. For long term monitoring both sensors are compatible with Skye DataHog2 loggers or other
manufacturers’ dataloggers. Please ask for further details.
This sensor is designed to give an integrated value of the PAR inside plant canopies. Its cosine response varies whether direct and diffuse light is being measured. In diffuse (overcast conditions) there is no difference between the readings from this sensor and a cosine corrected reference sensor. In direct sunlight the Line Quantum Sensor shows a true cosine response when mounted at a right angle to the radiation source and rotated around its axis (0- 50º angle ).
When mounted in line with the radiation source and rotated (0 – 50º) along its long axis indicated PAR output from the Line Quantum Sensor falls from 100 to 93% of that from the reference sensor.
Where high levels of direct radiation an East-West orientation is recommended.
Materials: Anodised Aluminium, Acrylic. IP65 sealed.
Cable: 5m Enhanced polyethylene screened twin 18 x 0.1mm
Sensor: 33, GaAsP Photodiodes. 350 - 680nm. peak at 640nm.
Sensitivity: 1 mV/10 mmol / m2/s
Temperature Sensitivity: ±0.15%/°C at peak response, from 0 - 50°C
Linearity: 1% over 0 - 2000µmol/m2/s
Uniformity of sensing surface: better than 2% over 0.85 sensing length
Response time: 2µs. 10 - 90%
Output: 200mV / 2,000µmol / m2 / s
Operating temperature range: -20°C - + 50°C
Hand-held Display Meter System – line quantum only
SKP 200 1-channel Display Meter
SKP 2200 2-channel Ratio Display Meter
SKP 215LQC/I Line quantum sensor with connector
Meter ranges for the SKP 215LQC/I sensors are 2000, 200, 20
mmols
Hand-held Meter System – line quantum plus incident sensor
SKL 904 4-channel SpectroSense2 Ratio Display Meter
SKL 908 SpectroSense2+ Logging Ratio Display Meter
SKL 925 SpectroSense2+GPS Logging Display Meter
with GPS mapping
SKP 215LQC/SS2 Line quantum sensor with connector
SKP 215/SS2 PAR Quantum sensor with connector
With waterproof connector for Skye DataHog loggers
SKP 215/I PAR Quantum sensor with connector
SKP 215LQC/I Line quantum sensor with Current output
and connector
SKP 215LQV/I Line quantum sensor with mV output
and connector
Wire ended sensor for own datalogger
SKP 215 PAR Quantum sensor with 3m cable
SKP 215LQC Line quantum sensor with Current output
SKP 215LQV Line quantum sensor with mV output
Accessories
SKM 221/T Levelling unit for PAR Quantum Sensor with
tripod mount