Total suspended particulate dust sensor D-FW 440 L

for particulate matterfine dustfor air quality monitoring

Product overview
The D-FW 440 L is an in-situ filter leakage monitor certified to EN 15859 (TÜV). Based on the triboelectric principle, it provides real-time detection of solid particles in gas flows with low maintenance and direct duct measurement.

Benefits

• Reliable leak detection
  Real-time, direct measurement inside the duct for immediate detection of filter failures.
• Standards compliance
  Designed for monitoring in accordance with EN 15267-1/-2, EN 15859 and related international standards.
• Proven triboelectric technology
  Particle detection based on charge interaction, suitable for demanding industrial environments.
• Easy installation and integration
  Compact design, ready to mount; standard 4–20 mA output and two independent alarm relays for system integration.
• Low maintenance operation
  No moving parts or consumables reduce downtime and operating costs.
• Supports predictive maintenance
  Detects changes in cleaning pulse magnitude and emission trends to prevent unplanned shutdowns.
• Wide industry applicability
  Applicable in cement, steel, power, pharmaceuticals, wood, food processing and other industries.

Compliance & Certifications

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

Applications

• Filter leak detection and dust emission control
  Continuous surveillance of baghouses, cyclones and exhaust ducts to ensure early detection of filter deterioration.
• Process control and trend monitoring
  Detects disturbances (cleaning, ventilation) and supports long-term performance analysis.
• Retrofit and compact installations
  Suitable for upgrades and confined spaces where direct in-situ measurement is required.

Technical specifications

• Measured parameter: Solid particles in gas flow
• Measuring principle: Triboelectric, in-situ, single-sided installation
• Measuring range: Detection limit 0.01 mg/m³; certification range 0 ... 7.5 mg/m³; additional ranges 0 ... 15 mg/m³ and 0 ... 100 mg/m³; up to several g/m³ depending on conditions
• Protection rating: IP66
• Power supply: 24 V (±10%) or 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 4 ... 20 mA output loop (max. loop resistance 250 Ω)
• Communication: 2 × RS-485, 1 × USB; Modbus RTU (VDI 4201 compatible)
• Ambient conditions: Temperature –20 … 50 °C; Humidity ≤ 95% RH (non-condensing)
• Process conditions: Max. 300 °C (option up to 700 °C); Pressure up to 600 kPa at ≤300 °C; flow velocity tested 3–40 m/s
• Materials: Housing aluminium (painted); probe stainless steel 316L; insulation Ryton (PPS)
• Probe lengths: Standard 500 mm; options up to 1,750 mm in 250/500 mm steps
• Weight: 1.5 kg (without probe)