Sensor for plant's growth

Par Sensors

PARMETER Sensor for plant’s growth

Sensor for P.A.R. measures

There are similarities between the photovoltaic phenomenon and the ‘light-dependent reaction’ of photosynthesis. Sun as primary energy source, electrons that jump on the upper orbit, once hit by sunrays.

PARMETER, thanks to a dedicated filter measures the spectral portion of the light in the range 400 to 700nm along a planar surface which correspond to the PAR , Photosynthetically Active Radiation. Plants use that wavelength range to conduct photosynthesis.

Thanks to this filter, PARMETER gives a good measurements of this wavelength range. The measure of PAR along a flat surface is called PPFD orPARMETER in experimental growth chamber for algaePhotosynthetic Photon Flux Density”.
It differs from “Photosynthetic Photon Flux Fluence Rate(PPFFR) which is revealed by spherical sensors of PAR.

PARMETER measures PPFD; it can be used outdoor, in greenhouses, in water or in growth chambers.
Output is in current loop and values can be easily converted in µmol of photons per square meter per second ( µmol /(m2 * s) ) S.I. Units

Price is competitive that bring the ratio ‘precision/price’ very interesting.

PAR SENSOR  
PRODUCTPAR meterPAR sensor
STANDARD REFERENCESIEC 60904-2; 60904-4; 60904-10
Li-190R 
OUTPUTAnalogical
Input range:Irradiation0 ÷ 4600 μmol / m2 • s
Spectrum400 ÷ 740 nm
Temperature-30 ÷ 90 °C
Output:Current4÷20mA
VoltageOptional kit for 0 ÷ 40mV output
Output accuracy:Irradiation± 4 % Temperature Compensated (2)
Non Linearity
Response time
SensorTypePhotovoltaic Silicon with Passband filter
Supply:Ext. Current loop9 ÷ 32 Vdc Protected against reverse polarity, short circ.
EncapsulantUV-resistant transparent resin
Can be submerged until 10m deep water
Cable50cm UV-resistant cable with Female connector
ConnectorFemale M8 3 pin, IP67
Male M8 3 pin, IP67 for field installation
Dimensions62x48x14 mm without fixing bracket
IP gradeIP 67
(2): Note: Recalibration advised after 12 months and then after 2 years.

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