Campbell Scientific CS120A CS120A Visibility Sensor - Page 15

User Guide Supported formats  RS232 (Full duplex only), default  RS485 (Half duplex)  8 bit data bytes  1 stop bit  Parity checking is not supported as most communication protocols used by the CS120A have built in checksums as well as checks that communications have been understood 5. Environmental specifications Minimum Nominal Maximum Value Value Value Sensor temperature ranges Operating temperature Extended operating temperature Storage temperature -25°C -40°C -40°C - +60°C - +70°C (1) - +85°C Sensor humidity ranges Operating humidity range 0% - 100% Sensor heater thresholds Dew heater Turn On Dew heater Turn Off Hood heater Turn On Hood heater Turn Off - 40°C - - 15°C - (1) Extended temperature ranges are only guaranteed if the sensor has been tested by Campbell Scientific and verified within this temperature range. Some degradation of absolute accuracy can be expected at the extremes of the extended ranges. 6. Mechanical specifications Main body including base mount Height: 447 mm Width: 640 mm Depth: 245 mm Sensor weight: 3 Kg Sensor mounting : Bracket mounts on a vertical pole 32-52.5 mm diameter. The mounting bracket has cut-outs for band clamps for larger diameter masts. Shipping weight: 6 Kg (including packing box) 7. Installation procedure The CS120A measures environmental variables and is designed to be located in harsh weather conditions. However there are a few considerations to take into account if accurate and representative data from a site are to be obtained. 5