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S2-412 Downward-Looking SDI-12 NDVI Sensor

Updated:2023-06-05

Brand:APOGEE
Model: S2-412
Product description: The S2-412 NDVI downward-looking sensor is a unique two-channel digital sensor for measuring 650 nm (Red) and 810 nm (NIR) with SDI-12 communication protocol. The sensor features a rugged, aluminum ho
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S2-412 Downward-Looking SDI-12 NDVI Sensor Introduction：

user's manual

The S2-412 NDVI downward-looking sensor is a unique two-channel digital sensor for measuring 650 nm (Red) and 810 nm (NIR) with SDI-12 communication protocol. The sensor features a rugged, aluminum housing that is built to withstand harsh conditions, and high-quality cable terminating in pre-tinned pigtail leads for easy connection to dataloggers and controllers. The sensor cable includes an IP68 marine-grade stainless-steel cable connector to simplify sensor removal and replacement from permanent installations for maintenance and calibration. Typical applications of NDVI sensors include measuring monitoring plant canopies. NDVI is related to leaf area of the plant canopy and canopy chlorophyll content of leaves and is often used to monitor green up n the spring and senescence in the fall.

The analog version of this sensor (S2-112) comes with the inline cable connector placed 30 cm from the sensor head for either standard use as a long-cable pigtail sensor, or for use with our microCache Bluetooth Micro Logger by unscrewing the connector, discarding the long section of cable and then screwing the sensor to the mating connector on the microCache.

S2-412 Technical Drawing：

S2-412 Specifications:

Calibration Factor (recipricol of sensitivity)	Custom for each sensor and stored in firmware
Calibration Uncertainty	± 5 %
Output Range	SDI-12
Power Supply	5.5 to 24 V DC
Wavelength Ranges	Red detector = 650 nm with 10 nm full-width half-maximum ± 3 nm; NIR detector = 810 nm with 10 nm full-width half-maximum ± 3 nm
Measurement Range	2x full sunlight
Measurement Repeatability	Less than 1 %
Long-term Drift	Less than 2 % per year
Response Time	Less than 0.6 s
Field of View	35°
Directional (Cosine) Response	± 2 % at 45˚; ± 5 % at 75˚ zenith angle
Temperature Response	Less than 0.1 % per C
Housing	Anodized aluminum body with acrylic diffuser
IP Rating	IP68
Operating Environment	-40 to 70 C; 0 to 100 % relative humidity
Dimensions	23.5 mm diameter, 43 mm height
Mass (with 5 m of cable)	110 g
Warranty	4 years against defects in materials and workmanship