SQ-421X-SS digital SDI-12 optical quantum sensor/photosynthetically active radiation sensor-Global supplier

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SQ-421X-SS digital SDI-12 optical quantum sensor/photosynthetically active radiation sensor

SDI-12 digital, 370nm~650nm spectrum, suitable for use in sunlight

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SQ-421X-SS is a digital optical quantum sensor that supports SDI-12.

It can be used to measure the photosynthetic photon flux density (PPFD) and photosynthetically active radiation (PAR) of plant canopies, reflections, or under canopy transmissions in the field, greenhouse, and growth chamber. It supports spectra from 370nm to 650nm and is suitable for natural light sources such as sunlight.

The sensor is equipped with an M8 aviation plug, which simplifies the disassembly and replacement of the sensor, making it easy to maintain and recalibrate.

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	SQ-100X-SS	SQ-202X-SS	SQ-204X-SS	SQ-205X-SS	SQ-301X-SS	SQ-421X-SS	SQ-422X-SS
power supply	self-power	5~24VDC	7~24VDC	5.5~24VDC	self-power	5.5~24VDC
type of output	0~250mV	0~2.5V	4~20mA	0~5V	0~250mV	SDI-12	Modbus
electric current	——	10μA	22mA(maximum); 2mA(Static)	10μA	——	1.8mA(Work); 1.4mA(Static)	RS-232：37mA RS-485Static 37mA; Dynamic 42mA
calibration factor	10µmol/m²/s/mV	1.6µmol/m²/s/mV	250µmol/m²/s/mV	0.8µmol/m²/s/mV	10µmol/m²/s/mV	Set and store each one in the firmware
sensitivity	0.1mV/µmol/m²/s	0.6mV/µmol/m²/s	0.004mA/µmol/m²/s	1.5mV/µmol/m²/s	——
Nonlinear	<1%（≤2500μmol/m²/s）	<1%（≤4000μmol/m²/s）			<1%（≤2500μmol/m²/s）
repeatability	<0.5%					<1%
response time	<1ms					<0.6s	<0.2s
Long-term Drift	<2%/year
angle of view	180°
spectral range	370nm~650nnm
directional response	± 5% (75 ° zenith angle)
Temperature response	-0.04%/℃
work environment	-10℃~60℃； 0~100RH%， Underwater depth<30m
Probe size	Diameter 24mm x Height 33mm	Diameter 30.5mm x Height 37mm			Length 616.4mm x Width 16.5mm x Height 13.6mm	Diameter 30.5mm x Height 37mm
weight	90g	140g			310g	140g

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