NWD-10 forward-scatter visibility sensor for highways, tunnels and airports, using 870 nm infrared pulses for fog monitoring.
Overview
The NWD-10 is a new-generation meteorological visibility sensor based on the forward-scatter principle of aerosols, consisting of an optical transmitter, an optical receiver and a microprocessor. The transmitter emits 870nm infrared pulses; the receiver detects the pulse light scattered forward by atmospheric aerosol particles, and the microprocessor converts it into Meteorological Optical Range (MOR) via a mathematical model. The unit mounts two cylindrical optical heads facing each other on a U-shaped bracket, with an anodized aluminium housing, weather-sealed, suitable for continuous coastal operation. Widely used at weather stations, automatic weather stations, airports, expressways, waterways, harbours and large vessels for continuous on-line visibility monitoring.
Applications
• Road and highway engineering laboratory testing
• Construction material quality control and acceptance
• Research and teaching laboratories
• Third-party inspection and certification bodies
Features
• Robust construction suitable for both laboratory and field use
• Compliant with relevant Chinese and international testing standards
• Complete with calibration certificate and operation manual
Technical Specifications
| Item | Specification |
| Method | optical forward scatter |
| Scatter angle | 39°–51° forward |
| Wavelength | 870nm; bandwidth 100nm |
| Range | 5m–10km (optional up to 80km) |
| Accuracy | ≤2km ±2%; 2–10km ±5%; 10–50km ±15%; 80km ±20% |
| Repeatability | ≤±4% |
| Update interval | 15s |
| Linear dynamic ratio | 3000:1 |
| MTBF | >20,000h |
| Power supply | 10–18V DC |
| Power consumption | <4.5W |
| Output | RS-232 / RS-485 |
| Housing | anodised hard aluminium, painted |
| Dimensions | 562×295×220mm |
| Weight | 6.5kg |
| Operating temp. | -40 to +70°C |
| Operating humidity | 0–100%RH |
| Maintenance | clean optics every 3–5 months |
| Application | weather stations, airports, highways, waterways, harbours, ships |
Standards
GB/T, JTG, ASTM
Standard Delivery
• Main instrument unit
• Power cable
• Operation manual
• Spare parts kit
FAQ
Q1: What standards does the NWD-10 Forward-Scatter Visibility Meter comply with?
A1: The NWD-10 Forward-Scatter Visibility Meter is designed and manufactured in accordance with relevant Chinese national (GB) and transport industry (JTG) standards, as well as applicable ASTM and AASHTO international standards. A calibration certificate traceable to national standards is provided with each unit.
Q2: How often should the NWD-10 Forward-Scatter Visibility Meter be calibrated?
A2: We recommend annual calibration by authorized technicians or by iRoad after-sales service center. For high-frequency laboratory use, semi-annual calibration is advised. The instrument is supplied with a factory calibration certificate.
Q3: What is the lead time and do you provide training?
A3: Standard units are usually shipped within 7-15 working days. Custom configurations may require 20-30 days. iRoad provides on-site installation, commissioning and operator training for major equipment; remote video guidance is available for standard laboratory instruments.
Overview
The NWD-10 is a new-generation meteorological visibility sensor based on the forward-scatter principle of aerosols, consisting of an optical transmitter, an optical receiver and a microprocessor. The transmitter emits 870nm infrared pulses; the receiver detects the pulse light scattered forward by atmospheric aerosol particles, and the microprocessor converts it into Meteorological Optical Range (MOR) via a mathematical model. The unit mounts two cylindrical optical heads facing each other on a U-shaped bracket, with an anodized aluminium housing, weather-sealed, suitable for continuous coastal operation. Widely used at weather stations, automatic weather stations, airports, expressways, waterways, harbours and large vessels for continuous on-line visibility monitoring.
Applications
• Road and highway engineering laboratory testing
• Construction material quality control and acceptance
• Research and teaching laboratories
• Third-party inspection and certification bodies
Features
• Robust construction suitable for both laboratory and field use
• Compliant with relevant Chinese and international testing standards
• Complete with calibration certificate and operation manual
Technical Specifications
| Item | Specification |
| Method | optical forward scatter |
| Scatter angle | 39°–51° forward |
| Wavelength | 870nm; bandwidth 100nm |
| Range | 5m–10km (optional up to 80km) |
| Accuracy | ≤2km ±2%; 2–10km ±5%; 10–50km ±15%; 80km ±20% |
| Repeatability | ≤±4% |
| Update interval | 15s |
| Linear dynamic ratio | 3000:1 |
| MTBF | >20,000h |
| Power supply | 10–18V DC |
| Power consumption | <4.5W |
| Output | RS-232 / RS-485 |
| Housing | anodised hard aluminium, painted |
| Dimensions | 562×295×220mm |
| Weight | 6.5kg |
| Operating temp. | -40 to +70°C |
| Operating humidity | 0–100%RH |
| Maintenance | clean optics every 3–5 months |
| Application | weather stations, airports, highways, waterways, harbours, ships |
Standards
GB/T, JTG, ASTM
Standard Delivery
• Main instrument unit
• Power cable
• Operation manual
• Spare parts kit
FAQ
Q1: What standards does the NWD-10 Forward-Scatter Visibility Meter comply with?
A1: The NWD-10 Forward-Scatter Visibility Meter is designed and manufactured in accordance with relevant Chinese national (GB) and transport industry (JTG) standards, as well as applicable ASTM and AASHTO international standards. A calibration certificate traceable to national standards is provided with each unit.
Q2: How often should the NWD-10 Forward-Scatter Visibility Meter be calibrated?
A2: We recommend annual calibration by authorized technicians or by iRoad after-sales service center. For high-frequency laboratory use, semi-annual calibration is advised. The instrument is supplied with a factory calibration certificate.
Q3: What is the lead time and do you provide training?
A3: Standard units are usually shipped within 7-15 working days. Custom configurations may require 20-30 days. iRoad provides on-site installation, commissioning and operator training for major equipment; remote video guidance is available for standard laboratory instruments.
