Transmission-Type Smoke Meter

Product Overview

The transmission-type smoke meter is a high-precision instrument designed to measure visible pollutants in the exhaust of compression-ignition engines, such as diesel vehicles. It features a split-flow optical design to protect the optical system, ensuring long-term stable operation.

The device complies with the Chinese standard GB 3847-2018 (Limits and Measurement Methods for Diesel Vehicle Emissions – Free Acceleration & Loaded Deceleration Methods) and accurately measures exhaust opacity and the light absorption coefficient. It is widely used in diesel vehicles and other compression-ignition engines, supporting emission control and regulatory compliance.

Working Principle

The smoke meter measures visible particulate matter using split-flow optical detection. As exhaust gases pass through the measurement chamber, a light beam traverses the gas. Particles in the exhaust absorb and scatter the light, causing a decrease in intensity.

A photodetector measures the transmitted light and calculates exhaust opacity and the light absorption coefficient, reflecting the concentration of visible pollutants. The measurement chamber is temperature-controlled to maintain a stable testing environment, minimizing the influence of ambient temperature fluctuations. The split-flow optical design also protects the optical components, ensuring long-term stability.

Key Features

• Dual Display: Simultaneously shows exhaust opacity and light absorption coefficient, providing comprehensive emission data.
• Temperature-Controlled Chamber: Maintains stable testing temperature to reduce environmental interference.
• Automatic Zeroing: Simplifies operation and ensures accurate measurements before each test.
• Expandable Interface: Includes connections for oil temperature and engine speed to enable more comprehensive exhaust analysis.
• Split-Flow Optical Design: Protects optical system components, enhancing stability and durability.
• Robust Construction: Suitable for complex on-site environments and long-term continuous operation.

Applications

• Vehicle Emission Testing: Measures visible pollutants in diesel and other compression-ignition engine exhaust to ensure compliance with environmental standards.
• Environmental Monitoring & Control: Used by regulatory agencies and monitoring institutions for emission supervision of diesel vehicles and heavy machinery.
• Engine Emission Performance Evaluation: Supports automotive R&D and manufacturing to assess engine emissions and optimize design for reduced pollutants.
• Inspection Stations: Provides high-precision testing tools for inspection stations to ensure vehicles meet national emission regulations.