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NDVI / PRI Sensor

Updated:2025-03-13

Brand: Apogee
Model: NDVI / PRI
Description: At METER, we think you should spend less time on complexity and more time doing what matters. Apogee NDVI and PRI sensors are easy-to-use. And the best part? They’re pre-configured for use with the ZE
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Product Details

NDVI / PRI Sensor Description：

NDVI Manual PRI Manual

Low cost—low maintenance

By focusing on just two relevant bands, it’s possible to make an accurate multiband radiometer for a fraction of what a full-spectrum spectroradiometer costs. Apogee NDVI/PRI sensors are multiband radiometers that combine an ultra-rugged form with sophisticated cloud data delivery for an unbeatable price-to-performance ratio. They're inexpensive enough to deploy multiple sensors simultaneously, so you can maximize spatial coverage and explore spatial and temporal variability in canopy structure and function.

Deploy for months or even years

Most spectrometers are delicate and expensive, making long-term field deployment risky. Apogee NDVI and PRI sensors are built for long-term exposure to the elements. Encased in a durable housing with an epoxy fill, they are watertight, weatherproof, and have fully sealed optics. Mount them on a fence post, tripod, or a meteorological tower. They’re rugged enough to leave in the field for an entire growing season or longer.

Field ready and radiometrically calibrated

Each sensor is radiometrically calibrated to a NIST-traceable standard. Readings are output in units of radiant flux density. Calibration information is stored on board the sensor, so you never have to worry about keeping track of calibration coefficients.

Collect data and monitor remotely

To simplify your workflow, Apogee NDVI and PRI sensors are plug-and-play with ZL6 data loggers, which means automatic sensor recognition and zero programming. ZENTRA Cloud lets you monitor remote sites in near-real time from any internet-connected device. Observe field conditions, check and configure sensor and system function, or download data from the comfort of your home or office.

Work less. Measure more.

Apogee NDVI/PRI sensors are part of a complete system of affordable, easy-to-use sensors, loggers, and software that require little maintenance and put near-real-time data at your fingertips, so you can publish more and work less.

NDVI / PRI Sensor Specification：

PRI SENSOR SPECIFICATIONS
Calibration factor (reciprocal of sensitivity)	Custom for each sensor and stored in firmware NOTE: The calibration factor (reciprocal of sensitivity) and output range are all approximations and variable from sensor to sensor
Calibration uncertainty	±5%
Output range	SDI-12 NOTE: The calibration factor (reciprocal of sensitivity) and output range are all approximations and variable from sensor to sensor
Power supply	5.5 to 24 V DC
Wavelength ranges	Green detector = 532 nm with 10 nm FWHM Yellow detector = 570 nm with 10 nm FWHM FWHM = full-width half-maximum
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	S2-421-SS (upward-looking): 180° S2-422-SS (downward-looking): 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	S2-421-SS (upward-looking): 30.5 mm diameter, 37 mm height S2-422-SS (downward-looking): 23.5 mm diameter, 43 mm height
Mass (with 5 m of cable)	S2-421-SS (upward-looking): 140 g S2-422-SS (downward-looking): 110 g
Cable	5 m of shielded, twisted-pair wire; TPR jacket (high water resistance, high UV stability, flexibility in cold conditions); pigtail lead wires; stainless steel (316), ZL6 stereo plug termination
NDVI SENSOR SPECIFICATIONS
Power supply	5.5 to 24 V DC
Calibration factor (reciprocal of sensitivity)	Custom for each sensor and stored in firmware
Calibration uncertainty	±5%
Output range	SDI-12
Wavelength ranges	Red detector = 650 nm ± 5 nm with 65 nm FWHM NIR detector = 810 nm ± 5 nm with 65 nm FWHM
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	180°
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 window
IP rating	IP68
Operating environment	-40 to 70 C; 0 to 100 % relative humidity
Dimensions	30.5 mm diameter, 34.5 mm height
Mass (with 5 m of cable)	140 g
Cable	5 m of shielded, twisted-pair wire with TPR jacket and stainless steel connector
Warranty	4 years against defects in materials and workmanship
Data logger compatibility (not exclusive)	METER EM60 series, ZL6 series, ZSC, ProCheck, Campbell Scientific