SPM Dust Analyser

DSL-340 MkIII Double Pass Dust Monitor

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The DSL-340 MkIII is a rugged, high-precision optical instrument designed to continuously monitor dust or particulate matter concentrations in the exhaust gas of industrial combustion or air filtration systems. Leveraging the Dynamic Detection Principle (DDP), the DSL-340 provides stable and drift-resistant measurements—making it ideal for long-term stack emissions monitoring and US EPA PS-11 compliant applications.

Wide Measurement Range: Monitors particulate concentrations from 0 to 1000 mg/m³ with selectable range.
Dynamic Detection Principle (DDP): Ensures superior stability and minimal drift over time, even with dirty optics.
Robust Construction: 316L stainless steel Transceiver and Reflector heads with air-purge assemblies.
Dual Operation Modes: Available as a standalone unit or with an optional Operator Interface (OI) for centralized control.
Real-Time Readings: Outputs in mg/m³, calibrated against standard reference measurements.
Simple Maintenance: Easy access to optical components for routine cleaning; no moving parts.
Integrated Calibration Check: Electronic calibration verification without disrupting operations.
Flexible Installation: Choice of wall-mounted or panel-mounted OI, or direct USB/Modbus communication via TRX head.
PC Software Included: Intuitive utility software enables setup, control, and data logging from any PC or laptop.

Measurement Principle: Dynamic Detection Principle (DDP), folded beam with light fluctuation analysis
Measuring Range: 0 – 1000 mg/m³ (user selectable)
Resolution: 0.1 mg/m³
Accuracy: ±2% of full-scale range
Path Length: 0.5 m to 10 m (flange-to-flange)
Operating Wavelength: 510 – 540 nm (green LED)
Drift with Temperature: ±0.5% over full range
Temperature Range (Gas): Up to +600°C (with insulating gaskets; higher on request)
Ambient Temperature: -20 to +55°C
Humidity: 100% RH (non-condensing)
Power Supply: 24 VDC (optional 90–260 VAC PSU available)
Current Consumption: 500 mA (nominal and startup)
Air Purge Flow: 50–200 L/min per head (1” BSP connection)
Data Output Options:
- Modbus RTU via RS485 (TRX or OI)
- USB interface (internal for OI, external for TRX)
- 4–20 mA analog output (isolated, scalable)
- 2 Digital Relay Contacts (signal & data valid)
Construction Materials:
- Heads: 316L stainless steel
- Air-Purge Body: Aluminium or stainless steel
- OI Enclosure: UL polycarbonate or powder-coated steel
Ingress Protection:
- Heads: IP65
- Wall-Mounted OI: IP65
- Panel-Mounted OI: IP64 (front face only)
Weight:
- 2.5 kg per TRX/Reflector head with air purge body
- 1.3 kg (each) for wall/panel OI
Warranty: 24 months (extensions available)
Compliance: US EPA PS-11, 2014/30/EU (EMC), 2014/35/EU (LVD)