A digital PPFD sensor with RS485 Modbus RTU communication for measuring the light available for photosynthesis.
Key features
A silicon photodetector with cosine correction, in a metal housing.
Applications
Suited to greenhouses, fields and research where light drives growth.
What this product isThe PAR sensor measures photosynthetically active radiation in the 400 to 700 nm spectral range. The silicon photodetector produces a signal proportional to light intensity, and cosine correction ensures the correct response at different angles of incidence. Each sensor is individually calibrated.
The technical values apply to the 400–700 nm PAR variant with RS485 Modbus RTU communication.
Specifications| Technical parameters | |
|---|---|
| Measured quantity | Photosynthetic photon flux density (PPFD) |
| Spectral range | 400 to 700 nm |
| Measuring range | 0 to 2500 µmol/m²·s |
| Accuracy | ±5 % of reading |
| Response time | < 1 s to 99 % of the final value |
| Temperature effect | < 0.05 %/°C |
| Cosine correction | < 10 % up to an 80° angle |
| Non-linearity | < ±2 % |
| PPFD is expressed in micromoles of photons per square metre per second (µmol/m²·s). | |
| Electrical & construction parameters | |
| Power supply | 5 VDC or 12–24 VDC |
| Communication output | RS485 |
| Communication protocol | Modbus RTU |
| Measured output | Direct PPFD value in µmol/m²·s |
| Sensing element | Silicon photodetector |
| Calibration | Individual sensitivity coefficient for each sensor |
| Operating temperature | −40 to +80 °C |
| Housing material | Aluminium alloy |
| Storage conditions | 10 to 60 °C at 20 to 90 % RH |
| Cable length | 1.5 m standard; 3 m variant available |
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