PAR Sensor-Photosynthetic Active Radiation Sensors


Product Description:

Photosynthetic active radiation sensors are designed to measure light intensity at frequencies associated with photosynthesis. This par sensor has a measurement range of 0 to 2500 umol/m2/sec and a wavelength range of 400 to 700 nm. All aluminum shell material, good waterproof, can be used outdoor for long-term monitoring. Provide you with RS485/0-5V/0-10V/4-20mA and other signal output methods.

Use in all weather conditions. When illuminated by light, a voltage signal proportional to the intensity of the incident radiation is generated, and its sensitivity is proportional to the cosine of the right angle to the incident light. Each photosynthetically active pyranometer has its own sensitivity that can be read directly in w/m2. This table is widely used in agrometeorology and crop growth research.It can well promote the development of smart agriculture.

PAR Sensor Features

The PAR (photosynthetically active radiation) sensor adopts the principle of photoelectric induction. The par sensor working principle: when there is light, a voltage signal proportional to the intensity of the incident radiation is generated, and its sensitivity is proportional to the cosine of the direct angle of the incident light. This par sensor uses high-precision photoelectric sensing elements, with high absorption in the 400-700nm spectral range and good stability. The shell adopts special treatment to reduce dust adsorption and effectively prevent the external environment from damaging the internal components. It is widely used in the research of meteorology, agriculture, air pollution, and other fields.

Photosynthetic Active Radiation Sensors Parameters

Parameter name Parameter value
Power supply 7V~30V DC
Output signal RS485/4~20mA/0-5V/0-10V
Power consumption 485 output: 0.06W, 4~20mA/0~5V/0~10V: 0.7W
Working temperature ‘-30℃~75℃
Response spectrum 400nm~700nm
Measuring range 0~2500μmol/㎡·s
Resolution 1μmol/㎡·s
Accuracy ±5%(1000umol/㎡·s, @550nm,60%RH,25℃)
Response time 0.1s
Linearity ≤±1%
Annual stability ≤±2%


This par sensor can be used alone for outdoor monitoring of radiation driving photosynthesis, or it can be used with a fixed weather station. Get accurate and cost-effective measurements of photosynthetically active radiation (PAR) from all light sources used to grow plants.

Photosynthetic Active Radiation Sensors are widely used in a agricultural meteorology, crop growth research, and other fields.


(1) Please be careful not to connect the wrong line sequence, because the wrong connection will cause the equipment to burn
(2) By default, 1.0 meters long wire is provided. Customers can extend the wire or connect it in sequence according to their needs.
(3) Note that there is no yellow line in the sequence that may be provided in some factory batches. In this case, the gray line is equivalent to replace the yellow line.


Here are some frequently asked questions about photosynthetically active radiation sensors, Hope they can help you.

How to install this photosynthetic active radiation sensor?

  • Secure the sensor to the mounting bracket using screws through the mounting holes on the sensor
  • Make sure the device is parallel to the ground (adjust the hand screw and check the level of the bubble to determine whether it is parallel)
  • After installation, remove the protective cover.

What is Photosynthetically Active Radiation?

The spectral components of solar radiation that are effective for plant photosynthesis are called photosynthetically active radiation, with a wavelength range of 380-710 nanometers, which basically coincides with visible light. The proportion of photosynthetically active radiation in the direct solar radiation increases with the increase of the sun’s altitude angle, up to 45%. In the scattered radiation, the proportion of photosynthetically active radiation can reach as much as 60~70%.

Can PAR be estimated from total shortwave radiation?

It is better to measure PAR and total shortwave radiation (PYR); however, PAR can be estimated from total shortwave radiation by using a physically-based model.

How are photosynthetically active radiation sensors calibrated?

Our photosynthetic radiation sensors have been calibrated before leaving the factory, and can be used directly without the need for secondary calibration by customers.


Photosynthetic Active Radiation Sensors Introduction Manual


There are no reviews yet.

Be the first to review “PAR Sensor-Photosynthetic Active Radiation Sensors”

Your email address will not be published. Required fields are marked *

Shopping Cart