The RWS-20 Road Weather Sensor is designed for use in road applications where accurate and reliable visibility measurements are required. The forward scatter measurement principle and unique design ensure the output is both accurate and reliable in all weather conditions and will not be influenced by local light sources, even flashing signs.
The 10m to 7.5km measurement range is optimal for use in road applications. Heating of the optical windows prevents misting and the optional sensor hood heating can be provided, allowing use in the harshest of conditions. Both optical windows are monitored for contamination and the visibility output is automatically compensated to reduce maintenance requirements.
In addition to the serial data interface, the sensor provides analogue voltage output and optional current outputs of visibility (MOR) or extinction coefficient (EXCO). Optional relays provide threshold and self-test switching capability.
| Measurement | Visibility (MOR) and EXCO |
| Output | RS232, RS422 or RS485 |
| 0-10V | |
| 4-20mA and Relay outputs (optional) | |
| Measurement principle | Forward scatter meter with 39° to 51° angle, centred at 45° |
| Measurement Error | ≤10% at 7,500m |
| Sensor Power | 9-36Vdc (5.2W) |
| Hood heating power | 24Vac or dc (24W) |
| Hood heaters | Fitted as an option to both sensor head hoods |
| Window contamination monitoring | Fitted as standard to both sensor head windows |
| Operating Temperature | -40°C to +60°C |
| Operating Humidity | 0-100% RH |
| Protection rating | IP66/IP67 |
| Weight | 4.2kg |
| Colour | Grey – RAL 7045 |
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