Comprehensive filter monitoring for industrial dust control

Why measure at the stack?

The stack is the final release point into the atmosphere. Monitoring here ensures you're capturing true emissions, including leaks or bypasses downstream of the filter, residual dust not captured by filtration, re-entrainment or secondary emissions from ducts or fans.

Why certified systems are essential

After complex filtration, exhaust gases become more challenging to measure:

• Lower dust concentrations require high-precision instruments
• Wet or sticky gases (e.g., post-FGD) demand specialized monitors like the D-R 909
• Variable gas compositions need high accuracy and robust calibration

Certified systems are engineered for these conditions and are mandatory under regulations like EN 15267 QAL1 and US EPA 40 CFR 60 PS 11.

DURAG GROUP’s certified particulate monitors:

• D-R 320 – Scattered light in situ dust monitor for emissions compliance in power, cement, metal smelting, etc. offering single-side and non-intrusive installation, adapted for ATEX & IECEx zones and use in wide stack diameters, ensuring automatic checks, and the lowest certified range (0–7.5 mg/m³) for precise dust measurement.
• D-R 808 – A robust in-situ PM-CEMS using backward scattering technology, QAL1 certified, compliant with US EPA 40 CFR 60 PS 11, designed for continuous and reliable particulate monitoring across industrial processes, including ATEX & IECEx zones.
• D-R 290 – Compact and cost-efficient in-situ opacity monitor for continuous particulate measurement in industrial stacks, offering reliable performance for medium to high dust concentrations. Compliance with regulatory frameworks like EN 15267, and exceeding US-EPA and ASTM standards, ATEX & IECEx certified.
• D-R 909 – Wet stack dust monitor for continuous particulate measurement in wet, sticky exhaust gases after FGD, wet scrubbers, and high-moisture dryers/boilers in industries such as power generation, waste incineration, pulp and paper, metallurgical, chemical, and drying processes. QAL1 certified for the range 0-7.5 mg/cm3, the lowest achievable on the market, US EPA 40 CFR 60 PS 11 compliant, cETLus listed (UL 61010-1).

Built for compliance and confidence

Certified systems include:

• Automated zero and span checks
• Contamination compensation
• Long-term stability and traceability

These features ensure data integrity and support QAL1, QAL2, and QAL3 quality assurance levels as required by EN 14181.

Demonstrating environmental accountability

Using certified monitors shows your commitment to:

• Environmental stewardship
• Corporate responsibility
• Transparent and compliant operations

It also helps avoid fines, shutdowns, and reputational risks.