Photosynthetically Active Radiation (PAR) Sensor

Product Introduction

The KH.FS Photosynthetically Active Radiation (PAR) Sensor is a high-precision agricultural light sensor designed to measure photosynthetically active radiation in the 400–700 nm wavelength range, which is the primary light spectrum used by plants for photosynthesis.

Using a high-precision optical detector, the sensor measures the intensity of solar radiation and provides reliable PAR and Photosynthetic Photon Flux Density (PPFD) data through an RS485 communication interface.

By monitoring the available light environment, the KH.FS helps agricultural and environmental monitoring systems evaluate crop growth conditions, optimize greenhouse lighting, and support data-driven precision agriculture.

The KH.FS is suitable for:

• Greenhouse light environment monitoring
• Crop growth monitoring
• Agricultural ecology monitoring
• Smart agriculture IoT systems
• Plant photosynthesis research
• Solar radiation and light environment monitoring
• Precision agriculture applications

The sensor provides continuous light environment data to support crop growth analysis, agricultural environmental monitoring, and intelligent farming management.

How It Works

The KH.FS uses a high-precision optical detector to measure radiation within the 400–700 nm photosynthetically active radiation spectrum.

This wavelength range corresponds to the portion of solar radiation that plants can utilize for photosynthesis. The sensor converts the detected optical radiation into measurable PAR and PPFD data and transmits the measurement results through RS485 communication.

By continuously monitoring light intensity and PPFD, agricultural monitoring systems can evaluate whether crops are receiving suitable levels of photosynthetically active radiation.

This measurement principle provides several advantages:

• Direct monitoring of the light spectrum used by plants for photosynthesis
• Reliable PAR and PPFD measurement
• Stable long-term monitoring
• Easy integration with agricultural IoT monitoring systems
• Suitable for greenhouse and outdoor agricultural environments

Key Features

• Industrial-Grade Durability: Waterproof, anti-condensation design with lightning protection and a wide operating temperature range for reliable field operation.

• Non-Contact Radar Measurement: Flow velocity measurement is not affected by weather conditions, sediment, floating debris, or vegetation.

• High Measurement Accuracy: Provides measurement accuracy of ±0.01 m/s with a resolution of 0.01 m/s for precise hydrological monitoring.

• Energy-Efficient Operation: Intelligent switching between measurement and sleep modes reduces power consumption, ideal for remote monitoring stations.

• Compact and Easy Installation: Lightweight design allows rapid deployment, maintenance-free operation, and seamless integration with IoT monitoring systems.

Application Scenarios

High-Precision PAR Measurement

The KH.FS uses a high-precision optical detector to provide accurate measurement of photosynthetically active radiation and stable performance during long-term agricultural monitoring.

400–700 nm Photosynthetically Active Radiation Detection

The sensor is specifically designed to monitor radiation within the 400–700 nm wavelength range, covering the primary spectrum utilized by plants for photosynthesis.

PAR and PPFD Measurement

The KH.FS supports measurement of both PAR power density and Photosynthetic Photon Flux Density (PPFD), providing useful data for crop growth analysis and plant light environment monitoring.

Compact Integrated Design

The integrated sensor structure provides a compact design that is easy to install and maintain, making it suitable for distributed agricultural monitoring stations and greenhouse IoT systems.

Low Power Consumption

With a power consumption of only 0.036 W, the sensor is suitable for long-term continuous operation in agricultural monitoring systems and IoT sensor networks.

RS485 Communication

The RS485 communication interface allows the KH.FS to connect with data loggers, RTUs, IoT gateways, and agricultural environmental monitoring platforms.

Strong Environmental Durability

The solid-state sensor structure provides good durability, weather resistance, corrosion resistance, and waterproof performance for long-term deployment in agricultural environments.

Stable Long-Term Monitoring

The sensor provides annual stability of ≤±3%, supporting reliable long-term monitoring of agricultural light environments and crop growth conditions.

Applications

Greenhouse Light Environment Monitoring

The KH.FS continuously monitors PAR and PPFD levels inside greenhouses, providing light environment data for crop growth management and greenhouse environmental control.

Crop Growth Monitoring

PAR and PPFD are important indicators of the light available for photosynthesis. The sensor provides quantitative light data to support crop growth analysis and precision agriculture.

Smart Agriculture IoT Systems

The RS485 interface enables integration with agricultural IoT gateways, data loggers, RTUs, and cloud-based monitoring platforms for centralized environmental data collection.

Agricultural Ecology Monitoring

The KH.FS can be used to monitor photosynthetically active radiation in agricultural and ecological environments, supporting analysis of plant growth conditions and environmental changes.

Plant Growth & Photosynthesis Monitoring

Continuous PAR and PPFD monitoring provides useful environmental data for evaluating the light conditions affecting plant photosynthesis and growth.

Precision Agriculture

Combined with temperature, humidity, soil moisture, soil temperature, and other environmental sensors, the KH.FS can form part of a multi-parameter crop growth monitoring system for data-driven agricultural management.

Technical Specifications

Sensor Parameters