Durag Group D-FW 440 D Dust Filter Monitor

The DURAG D-FW 440 D is an in situ dust filter monitor designed for the continuous, real-time monitoring of particulates emitted from dust arrestment plants. Using the triboelectric principle, the D-FW 440 D measures solid particles directly in the gas flow and can be calibrated in mass concentration units such as mg/m³, making it well suited for trend analysis, filter performance monitoring, and applications that require dust concentration output rather than simple relative indication.

DURAG positions the D-FW 440 D as a cost-effective, low-maintenance monitor that supports environmental compliance and operational efficiency. It is described as certified to EN 14181, EN 15859, EN 15267-1/-2, and as US EPA capable, making it a strong fit for facilities that need reliable dust filter monitoring with recognized compliance support. The monitor also offers direct in-duct measurement, standard 4 to 20 mA output, two independent alarm relays, and integration with PLC and control systems.

Available in Canada through Westech Industrial, the D-FW 440 D fits well within Westech’s emissions and dust monitoring offering for customers who need dependable filter monitoring, long-term dust trend visibility, and practical support for filtration system performance.

Durag_D-FW 440 D Dust filter monitor certified to EN 15859

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PRODUCT FEATURES

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Description

  • Continuous dust filter monitoring for real-time particulate measurement
  • Triboelectric measuring principle
  • Calibratable in mass concentration units (mg/m³)
  • Direct in situ measurement with no sampling or extraction
  • 4 to 20 mA output signal
  • Two independent alarm relays
  • Compact design for quick installation and system integration
  • Designed for low-maintenance operation with no moving parts or consumables

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Manufacturer Info

The DURAG Group is a global provider of intelligent solutions for process and environmental monitoring, combustion and safety monitoring, gas analysis, and continuous emissions monitoring systems. With decades of industry experience, DURAG supports safer, more efficient, and more sustainable industrial operations.

Website: https://www.durag.com/

SPECS

Measured parameter:
Solid particles in gas flow
Measuring principle:
Triboelectric, in situ measurement, single-sided installation
Detection limit:
0 ... 7.5 mg/m³
Additional ranges:
0 ... 15 mg/m³, 0 ... 100 mg/m³
Maximum range:
Up to several g/m³, depending on operating conditions and dust material
Protection rating:
IP66
Power supply:
24 V (±10%) or 100 ... 240 V~, 50/60 Hz
Power consumption:
Max. 10 W DC/AC
Output signals:
2 independent SPDT relays and isolated active 4 ... 20 mA output
Communication:
2 × RS-485, 1 × USB, Modbus RTU, compliant with VDI 4201
Ambient conditions:
–20 ... 50 °C, max. 95% RH non-condensing
Process temperature:
Up to 300 °C, optionally up to 700 °C
Minimum flow velocity:
3 m/s
Housing material:
Painted aluminium
Probe material:
316L stainless steel

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PRODUCT FAQ's

What is the DURAG D-FW 440 D used for?
The DURAG D-FW 440 D is used for continuous monitoring of particulate emissions from dust arrestment plants. It is designed for filter performance monitoring, dust concentration trending, and applications where operators need early warning of filter issues or changing emissions levels.
How does the D-FW 440 D measure dust?
The D-FW 440 D uses the triboelectric principle to measure solid particles directly in the gas duct. This direct in situ approach avoids the need for sample extraction and supports real-time measurement.
Is the D-FW 440 D suitable for compliance-related monitoring?
Yes. DURAG states that the D-FW 440 D is certified to EN 14181, EN 15859, and EN 15267-1/-2, and is also described as US EPA capable, making it suitable for facilities that require recognized dust filter monitoring standards.
What types of applications is the D-FW 440 D suited for?
DURAG lists applications such as dust filter detection, dust arrestment monitoring, process control, and trend monitoring in industrial filtration systems including baghouses, cyclones, and exhaust ducts. It is also described as suitable for industries such as cement, metalworking, wood processing, food and agriculture, chemicals, pharmaceuticals, and plastics processing.
Can Westech assist with selecting the right dust monitoring solution for this type of application?
Yes. Westech Industrial can help customers in Canada review filter monitoring needs, emissions monitoring goals, and application conditions to determine whether a dust filter monitor like the D-FW 440 D is the right fit.