CS120 Visibility Sensor

Operational

• Maximum Reported Visibility: 32 km (~20 miles)
• Accuracy:
  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

Mechanical

• 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)

Electrical²

• 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)

Interface

• 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)

Optical

• 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.