EasySyS ES-PAR2500 PAR Quantum Light Sensor

EasySyS ES-PAR2500 PAR Quantum Light Sensor

The ES-PAR2500 measures Photosynthetically Active Radiation (PAR) — the 400–700 nm band of sunlight that plants use for photosynthesis. A precision optical detector behind a 400–700 nm optical filter produces a signal proportional to the incident radiation, with a cosine-corrected response to the angle of incoming light.

Readings are delivered directly as photosynthetic photon flux density in µmol/m²·s, ready for any data logger, controller or PLC. The sensor is built for continuous 24/7 outdoor service, with a weather-resistant polymer housing and simple flange mounting on masts and brackets.

A choice of outputs — RS485 Modbus RTU, 4–20 mA, 0–2 / 0–5 / 0–10 V or SDI-12 — lets one sensor fit greenhouse automation, agro-meteorological stations and research platforms alike.

Key features

• True PAR measurement: 400–700 nm optical filter with direct readout in µmol/m²·s.
• High accuracy: ±2 % accuracy with 1 µmol/m²·s resolution over the full 0–2500 range.
• Fast response: response time below 1 second, tracking passing clouds and rapid light changes.
• Long-term stability: drift below ±2 % per year for multi-season datasets.
• Choice of outputs: RS485 Modbus RTU, 4–20 mA, 0–2 / 0–5 / 0–10 V or SDI-12.
• Wide temperature range: operates from −30 °C to +75 °C.
• Simple flange mounting for quick, level installation.
• Good unit-to-unit interchangeability — replace or add sensors without re-engineering.
• In the box: sensor in the selected output version, 2 m pre-wired signal cable and user manual with Modbus protocol.