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Original factory packaging
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Instrument Expert
Original factory packaging
Service Hotline：
(+86)010-52867771
Updated:2025-03-13
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Specification Sheet
The S2-441 PAR-FAR sensor is a unique two-channel digital sensor for measuring both the PAR (PPFD) and Far-red outputs of electric grow lights with SDI-12 communication protocol. The sensor features a rugged, aluminum housing that is fully-submersible and 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 PAR-FAR sensors include measuring both the traditional PPFD photosynthetic photon flux and separately quantifying the photon flux of far-red photons (700-750 nm). The outputs include the traditional quantum flux, the far-red photon flux, and the far-red fraction (far-red photon flux density / sum of PPFD and far-red photon flux density). This sensor quantifies far-red photons, and for many applications it reduces the need for a more complex measurement with a spectroradiometer.
| Power Supply | 5.5 to 24 V DC |
| Current Draw | 1.4 mA (quiescent), 1.8 mA (active) |
| Calibration Factor (reciprocal of sensitivity) | Custom for each sensor and stored in firmware |
| Calibration Uncertainty | ± 5 % |
| Output Range | SDI-12 |
| Measurement Repeatability | Less than 1 % |
| Long-term Drift | Less than 2 % per year |
| Non-linearity | Less than 1 % (up to 4000 μmol m?2 s?1) (PAR); Less than 1 % (up to 1000 μmol m?2 s?1) (Far-Red) |
| Response Time | Less than 0.6 s |
| Field of View | 180? |
| Spectral Ranges | 389 to 692 nm ± 5 nm (PAR); 700 to 750 nm ± 5 (Far-Red) |
| 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 | 30.5 mm diameter, 37 mm height |
| Mass (with 5 m of cable) | 140 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), M8 connector |
| Warranty | 4 years against defects in materials and workmanship |
| Manufactured | Made in the USA |
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