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Wuhan Chenyun Technology Co., Ltd
Product Introduction
The Photosynthetically Active Radiation (PAR) Meter is a device used to measure the radiation energy within a specific band (wavelengths of 400nm~700nm) of the solar radiation spectrum that can be absorbed and converted by plant pigments for organic matter synthesis. The instrument is designed in strict accordance with the GB/T 35139-2017 national standard. It consists of sensing components, optical filters, a cosine corrector, a signal output terminal, and structural components.
The PAR Meter adopts an aluminum alloy housing, featuring a robust structure, excellent sealing, long service life, high measurement accuracy, good stability, long transmission distance, and strong resistance to external interference. It is widely applicable in environments such as agriculture, aquaculture, greenhouses, laboratories, and any scenario requiring photosynthetically active radiation measurement.
Photosynthetically Active Radiation Basics
The five photosynthetic reactions of plants—photosynthesis, pigment synthesis, photoperiod phenomena, phototropism, and photomorphogenesis—all occur within the wavelength range of 400–700nm. Therefore, the radiation within the 400–700nm range is commonly referred to as Photosynthetically Active Radiation (PAR). PAR is represented by the symbol Qp, with units of W/m² or μmol·m⁻²·s⁻¹. It is the energy source for plant life activities, organic matter synthesis, and yield formation.
Technical Parameters
| Measurement Range (Energy Type) | □ 0-1500W/m2 | ||
| Measurement Range (Quantum Type) | □ 0-5000umol*m-2*s-1 | ||
| Power Supply | DC 5V | DC 9-30V | |
| Output Signal | Current | 4～20mA | |
| Voltage | 0～5V | ||
| Serial Port | RS485（Modbus） | RS485（Ascii） | |
| RS232（Modbus） | RS232（Ascii） | ||
| Cable Length | □ Standard: 2 meters | □ Other： | |
| Spectral Range | 400～700nm | ||
| Measurement Range | 0-1500W/m2 | ||
| Resolution | 1W/m2 | ||
| Response Time | ≤5 ms（95%） | ||
| Nonlinearity | ±4% | ||
| Directional Response (corrected within zenith angle ≤80°) | ±10％ | ||
| Temperature Response（-20℃～60℃） | ±5% | ||
| Annual Stability | ±3% | ||
| Spectral Response Bandwidth | （400±10）nm～（700±10）nm | ||
| Spectral Selectivity Error | ±5% | ||
| Response Outside Specified Bandwidth | ≤10% | ||
| Protection Level | IP67 | ||
| Working temperature and humidity environment | Operating Temperature：-40～80℃；Relative Humidity：0～100%RH | ||
| Power Consumption | ≤100mW@5V | ||
Product testing
Product Features
Structure Dimensions
Contact Us
Address：Room 01, 3rd Floor, Building 4, Gezhouba Sun City, No. 40 Gaoxin 4th Road, Donghu New Technology Development Zone, Wuhan，Hubei，China
Tel：+8619522958500
Whatsapp：+8615271247832
Room 301, Building 4, Gezhouba Sun City Industrial Park, East Lake High-tech Development Zone, Wuhan, China
+86 027-87915379
info@whchenyun-tech.com
Yigood-wh / +8615271247832
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