LASER DUST MONITOR
NPL Certified
LM-318 is an in-situ, single pass, non-contact, cross-stack optical laser dust monitor which measures dust concentration by measuring opacity of the transmission medium.
BENEFITS- Fast response time
- Reasonable cost
- Optimal for stacks up to 10 meters
- No moving parts
- Good stability and reliability
- Long-term accuracy and stability
- Transferable without factory calibration
- Easy beam alignment
TYPICAL APPLICATIONS
Power plants 
Cement factories 
Tunnels
Iron and Steel
Textile
PRINCIPLE OF OPERATIONWhen a monochromatic light beam, such as laser beam, traverses through gas that contains particulate matter, the intensity of the beam will decrease by absorption and scattering processes within the particulate distribution. The opacity of the stack gases which attenuates visible light due to the presence of particulate in the effluent is used to measure the concentration of dust in the stacks.
| SPECIFICATION | ||
|---|---|---|
 | Unit of Measure | mg/Nm³ |
 | Range | 0–2000 mg/Nm³ (user configurable) |
 | Stack Diameter | 0.5 to 10 m |
 | Settling Time | 1 s |
 | Accuracy | ±1% Full Scale |
 | Resolution | 1 mg/Nm³ |
 | Optical System | Single Pass, Visible Laser @ 650 nm |
 | Alignment Verification | Built-in through Lens System |
 | Analog Output formats | Current 4–20 mA, 500Ω max. Voltage 0–10 VDC, 1kΩ output impedance |
 | Digital Output formats | Modbus RTU over RS232 |
 | Relay outputs | Alarm buzzer |
 | Power requirement | 220V AC: 14VA Optional: 110 VAC 14VA |
 | Operating temperature | 0°C to +70°C (32°F to 158°F) |
 | Humidity | 10 to 90% RH |
 | Dimension in mm | Monitor Unit: 213 × 185 × 104.5 mm Transmitter: 125 × 80 × 145 mm Receiver: 170 × 110 × 125 mm |
 | Material | ABS plastic UL-94HB |
 | Degree of Protection | IP65 |
ACCURATE MEASUREMENT
RELIABLE PERFORMANCE
LOW MAINTENANCE
COST EFFECTIVE