Meteorological Sensors

SR50A-L Sonic Ranging Sensor


Primarily used for snow level

The SR50A measures the distance from the sensor to a target. The most common applications are measuring snow depths and water levels. The sensor is based on an electronic transducer that determines the distance to a target by sending out ultrasonic pulses and measuring the time it takes for the echoes to return.



  • The SR50A was designed to meet the stringent requirements of snow depth measurement, so it is well-suited to a variety of other applications. It can pick up small targets or those that are highly absorptive to sound, such as low-density snow. Campbell Scientific Canada builds it to withstand extreme conditions in harsh environments.
  • Since it uses the SDI-12 protocol, the SR50A supports various commands. The different commands are entered as options in the SDI-12 recorder instructioin. The user has the option to output the distance to target in either meters or feet, or to include measurement quality numbers.



  • Less than 1 sec measurement time
  • Low power drain on datalogger
  • Accurate to 1 cm or 0.4 percent of distance to target (whichever is greater)
  • Measurement range 0.5 to 10 m
  • Weight: 0.4 kg


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Sonic Ranging Sensor Brochure

File Size 496KB   Filename b_sr50a.pdf   Download