Optical dust monitoring using laser or light for accurate emissions monitoring

Reliable emissions monitoring with automatic self-checks and minimal maintenance

DURAG

With the right in situ dust analyzer, even the lowest dust concentrations can be measured reliably, enabling effective emissions monitoring, process control, and early process intervention. DURAG offers a comprehensive range of dust monitors, each based on application-specific measurement principles and available with a variety of optional features.

Optical transmission analyzers determine dust concentration by measuring the attenuation of a light beam that passes twice across the diameter of the duct. This measurement principle is particularly suitable for larger duct diameters and higher dust concentrations.

Laser-based dust analyzers operate according to the principle of optical back-scattering. For ultra-low dust concentrations, both direct and scattered laser light are detected and evaluated, providing highly sensitive and reliable measurements.

• Continuous measurement of dust concentration (mg/m³)

• High sensitivity, even at very low concentrations (from approximately 0–5 mg/m³)

• Optical back-scattering (light scattering) measurement principle

• Automatic zero, span, and contamination checks

• Automatic background light compensation

• Integrated purge air system for sensor protection and extended service life

• Minimal maintenance and long service intervals

• Simple single-sided installation on standard flanges

• Real-time communication via Modbus (VDI 4201-3)

• Suitable for process temperatures up to 600°C

• EN 15267 certified for emissions monitoring

• Optional fail-safe shutter for additional protection