DURAG GROUP announces cETLus certification for D-R 909 wet stack extractive particulate monitor

Hamburg, Germany, March 25, 2026 – DURAG GROUP is pleased to announce that its established D‑R 909 extractive wet dust monitor has now received cETLus certification, confirming compliance with applicable U.S. and Canadian electrical safety requirements. This new certification broadens the product’s accessibility for customers in North America who need proven, safety‑tested particulate monitoring equipment.

Alongside this certification update, DURAG GROUP is introducing a refined version of the D‑R 909 featuring a lighter and more efficient cable structure. This enhancement makes installation and maintenance even easier for operators and service specialists, further improving the user experience of an already trusted solution.

The D‑R 909 is designed for continuous particulate measurement at small to medium concentrations in humid or wet flue gases, particularly where the gas stream is below dew point. Its reliable performance makes it an excellent choice for wet scrubbers, FGD systems, WESPs, and other moisture‑laden gas streams where traditional optical systems struggle.

The monitor is fully approved to meet international regulatory standards, including EN 15267, EN 14181, UL 61010-1, and US EPA 40 CFR 60 PS 11. It also carries QAL1 certification from TÜV and MCERTs for the 0–7.5 mg/m³ range, the lowest achievable market-wide for a PM‑CEMS. This allows operators in regulated industries to meet demanding emissions limits with confidence.

Engineered for durability, the D‑R 909 is certified to operate reliably from -40 °C to +60 °C, giving it an extended usable temperature window compared to other available systems and offering greater flexibility for global deployment such as cold outdoor stacks, exposed platforms and warm industrial environments. A certified six‑month maintenance interval - validated in a year‑long power plant field test - further demonstrates the system’s stability and low life‑cycle cost. The optical system is self‑checking, purge air keeps critical components clean, and the design requires no heated sample lines, ovens, or moving parts.

A key advantage of the D‑R 909 is its exceptionally low operating expenditure (OPEX). The monitor’s design avoids cost‑intensive components such as heated sample lines or vaporizing ovens. Instead, the D‑R 909 uses an efficient heated sampling probe that evaporates droplets with significantly lower energy demand and reduced component stress. With operating temperatures up to 160 °C, this design keeps the sampling path compact and easy to maintain, contributing directly to the system’s very low OPEX. Automated optical checks and purge‑air cleaning reduce the need for manual intervention, and the system’s certified six‑month maintenance interval, validated by a long‑term field test, minimizes service visits and downtime. Together, these design features result in significantly lower energy consumption, life‑cycle cost and a highly predictable service routine.

With its robust construction and application flexibility, the D‑R 909 is well suited for industries such as power generation, waste‑to‑energy, chemicals, steel, and process manufacturing. Additional application guidance and technical details are available on the product detail page: 
https://www.durag.com/en/product-filter-837.htm?productID=D-R%20909