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Instrument Expert
Original factory packaging
Service Hotline：
(+86)010-52867771
Updated:2025-03-13
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NDVI Manual PRI Manual
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.
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.
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.
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.
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.
| 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 |
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