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Dust Opacity Monitor

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Dust Opacity Monitor

  • Advanced detector for dust emissions and process flow applications
  • Easily selectable alarm threshold level and time delay
  • wo independent SPDT relay contacts for alarm indications with selectable fail-safe mode
  • Industrially hardened, noise resistant design; can operate on an ESP and other challenging applications
  • Suitable for all particulates - Accurate sensing method
  • Virtually maintenance-free - Low cost of ownership
  • Suitable for virtually all dust collectors
  • Data Logger with RS232/485 and USB Computer Interface
  • Web based data Transfer through GSM/GPRS technology

DSL-340 is an optical, double-pass dust/opacity monitor designed to measure dust, smoke, and particulate matter concentration in exhaust gas streams from ducts, stacks or flues in industrial settings. It provides real-time digital readings that help industries monitor emissions for air quality compliance and process control.

Core Technology & Principle

  • Measurement Principle: Innovative Dynamic Detection Principle (DDP) — based on detecting fluctuations in light intensity caused by particles passing through a light beam between a Transceiver (TRX) and Reflector.
  • Optical Sensing: Continuous in-situ optical monitoring directly in the exhaust gas path with no sample extraction
  • Output Units: Reports particulate concentration as mg/m³ (when calibrated against reference measurements).

⚙️ Key Features

  • Dynamic Detection Principle (DDP): Reduces drift and is less affected by changes in light source intensity compared with conventional opacity monitors.
  • Rugged Construction: Durable 316 stainless steel body designed for harsh industrial environments.
  • Calibration: Built-in electronic calibration check facility for accuracy assurance.
  • Interfaces: Flexible interfaces — 4–20 mA analogue, Modbus RTU (RS485), USB communication, and optional operator interface.
  • Free Utility Software: For PC-based setup, configuration, and data logging.
  • Low Maintenance: No moving parts and rugged design for reliable continuous operation.

Typical Applications

DSL-340 is widely used for continuous emission monitoring in industrial processes such as:

  • Boilers, furnaces & kilns in cement and steel plants
  • Air filtration systems, ESP outlets and bag houses
  • Power plants and waste-to-energy facilities
  • Incinerators, industrial stacks, and other high particulate environments

Why It’s Used

This monitor provides continuous, real-time dust/opacity readings to help facilities:

  • Meet regulatory air emission standards
  • Control pollution and improve environmental compliance
  • Optimize combustion and filtration processes

Typical Specifications (example ranges)

Measuring Range Typically up to ~1000 mg/m³ particulate concentration.
Accuracy High measurement accuracy with low drift over time.
Operating Temperature: Standard ambient range ~-20 °C to +55 °C.
Power ~24 V DC (with optional AC supply models available)
Ingress Protection IP65 rated for outdoor/industrial environments.
Output 4-20mA & SPDT Relay
Probe Insertion length 3” to 36” ( 7.6 Cm to 91.4 Cm)
Installation Weld the supplied fitting into the pipe or Duct and insert Sensor
Sensor Mounting Flanged, ½”MaleNPT NPT, Quick release