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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 S2-141 PAR-FAR sensor is a unique two-channel sensor for measuring both the PAR (PPFD) and Far-red outputs of electric grow lights and is self-powered. 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 (700-760 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.
The analog version of this sensor (S2-141) 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.
| Power Supply | Self-powered |
| Output (sensitivity) [varies per sensor] | 0.01 mV per μmol m?2 s?1 (PAR); 0.03 mV per μmol m?2 s?1 (Far-Red) |
| Calibration Factor (reciprocal of sensitivity) [varies per sensor] | 100 μmol m?2 s?1 per mV (PAR); 38 μmol m?2 s?1 per mV (Far-Red) |
| Calibration Uncertainty | ± 5 % |
| Output Range | 0 to 40 mV (PAR); 0 to 20 mV (Far-Red) |
| 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 1 ms |
| 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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