Total suspended particulate dust sensor D-FW 440 D

for particulate matterfine dustfor air quality monitoring

Overview The D-FW 440 D is an in-situ particulate / dust filter monitor designed for continuous, real-time measurement of solid particles in gas flows. Calibratable in mass concentration (e.g. mg/m³) and certified to standards including EN 14181 and EN 15859; US EPA capable. Engineered for low maintenance and direct duct installation to support regulatory compliance and reliable plant operation.

Technology Triboelectric sensing principle; direct in-situ, single-sided installation for dust arrestment plants and filtration systems.

Benefits

• Direct monitoring of dust filter performance — provides quantitative dust concentration (mg/m³) for filter control and trend analysis.
• Standards compliance — measurement capabilities aligned with EN 14181, EN 15267-1/-2, EN 15859, US EPA and other international standards.
• Proven triboelectric detection — reliable particle detection based on charge interaction, suited to industrial environments.
• Compact, easy installation — suitable for retrofits and confined mounting locations; compatible with control cabinets and process ducts.
• Standard output and alarms — isolated 4 ... 20 mA active loop plus 2 independent SPDT relays (NO/NC) for PLC/process integration and alarm reporting.
• True in-situ measurement — no extraction sampling, enabling immediate response to emission events.
• Low maintenance — no moving parts or consumables, minimizing downtime and operating costs.
• Supports predictive maintenance — detects changes in filter cleaning pulses and emission trends to enable proactive interventions.
• Improves environmental performance — helps meet emission limits and reduce risks of product loss or regulatory penalties.
• Enhanced safety — continuous monitoring reduces exposure and lowers dust explosion risk.
• Wide industry use — applicable in cement, steel, power generation, pharmaceuticals, wood processing, food/agriculture and more.

Compliance & Certifications

• EN 15267-1 (2009)
• EN 15267-2 (2023)
• EN 15859 (2010)
• EN 14181 (2015)
• US EPA capable

Applications

• Continuous dust filter detection and dust arrestment monitoring for baghouses, cyclones and exhaust ducts to detect filter failures early and control emissions.
• Process control and trend monitoring to reveal cleaning cycle faults, ventilation issues and long-term performance shifts.
• Suitable across multiple sectors where dust control and compliance are critical: cement plants, metalworking and welding extraction, sawmill and wood processing filtration, food and agriculture powder processing, chemical and pharmaceutical production, plastics processing.

Technical data (table) Measured parameter: Solid particles in gas flow
Measuring principle: Triboelectric, in situ measurement, single-sided installation
Measuring range: Detection limit 0.01 mg/m³; Certification range: 0 ... 7.5 mg/m³; Additional ranges: 0 ... 15 mg/m³; 0 ... 100 mg/m³; Max. range up to several g/m³ depending on conditions and dust material
Protection rating: IP66
Power supply: 24 V (±10%); 100 ... 240 V~ ±10%, 50/60 Hz
Power consumption: Max. 10 W DC/AC
Output signals: 2× independent SPDT relays (max. 30 V/5 A or 240 V~/5 A); Isolated active 4 ... 20 mA output loop (max. loop resistance 250 Ω), certified to EN 15859
Communication interface: 2× RS-485, 1× USB
Communication protocol: Modbus RTU (RS-485), compliant with VDI 4201
Ambient conditions: Temperature –20 … 50 °C; Humidity max. 95% RH (non-condensing)
Process conditions: Temp. max. 300 °C (optionally up to 700 °C); Pressure: max. 600 kPa up to 300 °C, max. 300 kPa at 300 … 700 °C with high-temperature connection; Flow velocity: min. 3 m/s, max. tested 40 m/s
Operation/configuration: Optional D-ESI FW software
Material: Housing painted aluminium; probe 316L stainless steel; insulation polyphenylene sulfide (Ryton R-4)
Probe dimensions: Standard length 500 mm; other lengths up to 1,750 mm on request in 250 or 500 mm increments
Weight: 1.5 kg (without probe)

Technical specifications

• Model: D-FW 440 D
• Measured parameter: Solid particles in gas flow
• Detection limit: 0.01 mg/m³
• Certification range: 0 ... 7.5 mg/m³ (other ranges available)
• Measuring principle: Triboelectric, in situ
• Protection rating: IP66
• Power supply options: 24 V DC or 100 ... 240 V~
• Max. power consumption: 10 W
• Outputs: Isolated 4 ... 20 mA active loop, 2× SPDT relays
• Interfaces: RS-485 (2×), USB
• Protocol: Modbus RTU, VDI 4201 compliant
• Operating ambient temperature: –20 … 50 °C; process up to 300 °C (optionally 700 °C)
• Probe lengths: Standard 500 mm; up to 1,750 mm on request
• Housing: Painted aluminium; probe: 316L stainless steel
• Weight: 1.5 kg (without probe)