CS120 Visibility Sensor
The CS120 Visibility Sensor uses tried-and-tested, infrared forward-scatter technology, and uses the proven 42° scatter angle to report meteorological observable range (MOR) for fog and snow in the range 10 to 30,000 m.
It combines a high specification with a very competitive price and is ideal for stand-alone applications or in combination with automatic weather stations in road, marine, aviation, and wind-energy environments.
Benefits and Features
- High performance visibility sensor at a competitive price
- Incorporates automatic dew and hood heaters for all-weather operation
- Simple field calibration using optional calibration kit
- Low power - suitable for remote application
- Automatic status check for faults or window contamination
- Sensor design minimises airflow disruption at measurement volume
Compared to many such sensors the CS120 design means that visibility is being measured in a relatively clean space because the position of the heads and body minimize disturbance of the airflow at the measurement volume.
High speed sampling improves the accuracy of measurements taken during mixed weather and during events which return intermittent signals such as rain and hail, both known weaknesses of some competing systems.
Integrated low power heaters prevent the build up of dew and higher powered anti-icing heater are also included. All heaters are automatically controlled for simple operation in all types of weather.
The sensor is very power efficient drawing just 3 W during normal operation including the dew heaters, power can be reduced further by reducing the sample rate and manual control of the heaters.
- Maximum Reported Visibility: 32 km (~20 miles)
0 to 10,000 m ±10%;
10,000 to 20,000 m ±20%
- Operating Temperature:
-25° to +60°C
- Operating Humidity: 0 to 100%
- Wind Speed: Up to 60 m/s
- Sensor Sealing: rated to IP66
- Weight: ~3 kg (dependent upon mounting system)
- Height: 447 mm
- Width: 640 mm
- Depth: 246 mm
- Mount1: Stainless steel V-bolt mounting to pole (diameter of 32 mm to 52.5 mm)
- Electronic Supply Voltage: 8 to 30 Vdc
- Hood Heater Supply Voltage: 24 Vdc or Vac
- Hood Heater Power: 2 x 30 W, total of 60 W
- Dew Heater Power: 2 x 0.6 W, total of 1.4 W
- Total Unit Power: < 3 W while sampling continuously (including dew heaters)
- Serial Interface: RS232 or RS485
- Serial Data Rates: 1200 to 115,200 bps (38,400 bps default rate)
- Alarm Outputs: 2 x 0 to 5 V outputs, 32 mA (max)
- Emitter Light Frequency: 850 nm
- Lens Contamination Circuitry: Monitors both the source and detector lenses for contamination/blockage at 1 s intervals; sensor adjusts its calibration for low to moderate window contamination.
- Light Source Stability Control: Ensures stable operation through variations in temperature and with sensor aging; corrected at 1 s intervals.
1 - An optical mount is available to place the sample volume at 1.5 m as recommended by the WMO.
2 - Lower power states can be achieved by less frequent sampling and remote control of heaters.