SR50A-L Sonic Ranging Sensor
Rugged acoustic distance sensor
Typically used for snow depth or water depth measurements
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Überblick

Akustischer Schneehöhensensor

Der SR50A ist ein robuster akustischer Sensor zur Messung der Distanz zu einem Ziel. Normalerweise wird er genutzt, um Schneehöhe oder Wasserstand zu messen, andere Anwendungen sind aber auch möglich. Er wurde von Campbell Scientific Canada entwickelt und enthält einen Algorithmus, der mehrfache Echos auswertet, um bessere Genauigkeit zu erhalten. Er ist mit fast allen Campbell Datenloggern kompatibel, da er ein SDI-12-Signal ausgibt.

Temperaturkompensation

Der SR50AT enthält einen externen Temperatursensor zur Kompensatione der Schwankungen der Schallgeschwindigkeit mit der Temperatur, es kann aber auch ein Temperatursensor an der Station mit dem SR50A verwendet werden.

Beheizte Variante

Der SR50A und der SR50AT sind mit eingebauter Heizung erhältlich, um Vereisung zu vermeiden. Man kann auch noch nachträglich eine Heizung anbauen.

Hinweis: Beim Einsatz in marinen Umgebungen kann es Probleme geben.

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Funktionen und Vorteile

  • Wide operating temperature range
  • Nutzer kann unter verschiedenen Ausgabeoptionen wählen
  • Kompatibel mit fast allen Datenloggern von Campbell Scientific

Bilder

Technische Beschreibung

The SR50A was designed to meet the stringent requirements of measuring depths and uses a multiple echo processing algorithm to help ensure measurement reliability.

SDI-12, RS-232, and RS-485 output options are available for measuring the SR50A. Campbell Scientific’s MD485 interface can be used to connect one or more SR50A sensors in RS-485 mode to an RS-232 device. This can be useful for sensors that require lead lengths that exceed the limits of either RS-232 or SDI-12 communications.

The SR50A replaced the SR50 in March 2007. The newer SR50A is smaller and has different output options than its predecessor. The SR50AH is available with a heater option for locations where rime ice is a problem.

Spezifikationen

Measurement Time < 1.0 s
Measurement Range 0.5 to 10 m (1.6 to 32.8 ft)
Output Options SDI-12 version 1.3, RS-232, RS-485 (output options selected by configuring internal jumpers)
Baud Rates 1200 to 38400 bps (RS-232, RS-485 modes)
Power Requirements 9 to 18 Vdc (typically powered by datalogger’s 12 Vdc power supply)
Beam Acceptance ~30°
Resolution 0.25 mm (0.01 in.)
Accuracy ±1 cm (0.4 in.) or 0.4% of distance to target (whichever is greatest). Requires external temperature compensation.
Operating Temperature Range -45° to +50°C
Compliance CE Compliant
Length 10.1 cm (4.0 in.)
Diameter 7.5 cm (3 in.)
Cable Weight 250 g (8.2 oz) for a 4.57-m (15-ft) cable
Weight
  • 375 g (13.2 oz) without cable
  • 1.0 kg (2.2 lb)

Maximum Cable Length

-NOTE- Cable lengths greater than 60 m require a heavier gage wire if the power supply drops below 11 Vdc.
SDI-12 60 m (196.9 ft)
RS-232 30 m (98.4 ft)
Baud rates ≤ 9600 bps
RS-485 300 m (984.3 ft)

Power Consumption

Active 250 mA (typical)
Quiescent SDI-12 Mode < 1.0 mA
Quiescent RS-232/RS-485 Modes
  • < 1.25 mA (≤ 9600 bps)
  • < 2.0 mA (> 9600 bps)

Kompatibel mit

Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.

Datenlogger

Product Compatible Note
CR1000 SDI-12 and RS-232. For RS-485, requires an MD485 interface or similar RS-485 to RS-232 interface.
CR200X SDI-12
CR216X SDI-12
CR300 SDI-12 and RS-232. For RS-485, requires an MD485 interface or similar RS-485 to RS-232 interface.
CR3000 SDI-12 and RS-232. For RS-485, requires an MD485 interface or similar RS-485 to RS-232 interface.
CR5000 SDI-12 and RS-232. For RS-485, requires an MD485 interface or similar RS-485 to RS-232 interface.
CR6 SDI-12, RS-232, and RS-485
CR800 SDI-12 and RS-232. For RS-485, requires an MD485 interface or similar RS-485 to RS-232 interface.
CR850 SDI-12 and RS-232. For RS-485, requires an MD485 interface or similar RS-485 to RS-232 interface.
CR9000X SDI-12 and RS-232. For RS-485, requires an MD485 interface or similar RS-485 to RS-232 interface.

Miscellaneous

Product Compatible Note
CR310 SDI-12 and RS-232. For RS-485, requires an MD485 interface or similar RS-485 to RS-232 interface.

Additional Compatibility Information

Datalogger Considerations

One single-ended channel per probe is required; an excitation channel can be shared by several probes.

Downloads

SR50A/AT OS v.1.3 (52 KB) 22-08-2007

Current SR50A / AT firmware.
Liste der Änderungen

FAQs für

Number of FAQs related to SR50A-L: 17

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  1. Yes, but more routine maintenance of the sensor is needed in marine environments.

  2. Yes. The accuracy of the sensor is 1 cm or 0.4% of distance to water (whichever is greater). As long as the water level is deeper than this, the water height can be confidently determined.

  3. No. This causes echoes and reflections that confuse the sensor.

  4. Because the speed of sound changes with temperature, Campbell Scientific recommends using the SR50A-L in tandem with a temperature sensor for the most accurate measurements.

  5. Approximately 800 feet. This is a function of the limitations of the SDI-12 signal.

  6. This sensor requires regular maintenance in a marine environment. The SR50A-L functions properly if care is taken to keep the vent free of salt accumulation and the interior free of moisture by replacing the desiccant as needed. It may also be necessary to carefully clean the face of the sensor to remove salt deposits.

  7. The sensitivity can be adjusted slightly at the factory, but it cannot be recalibrated. Typically, the transducing diaphragm needs to be replaced periodically to maintain calibration. This can be done by the user or at the factory.

Anwendungsbeispiele

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