Akustischer Schneehöhensensor
Der SR50A ist ein robuster akustischer Sensor zur Messung der Distanz zu einem Ziel. Normalerweise wird er genutzt, um Schneehöhe 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. Campbell Scientific empfiehlt dafür den SR50A-316SS-L .
Lesen Sie mehrThe SR50A was designed to meet the stringent requirements of measuring snow depth, and it 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.
Measurement Description | Snow depth |
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 data logger’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 |
Temperature Accuracy |
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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 |
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Maximum Cable Length |
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-NOTE- | Cable lengths greater than 60 m require a heavier gage wire if the power supply drops below 11 Vdc. |
SDI-12 | 60 m (200 ft) |
RS-232 |
60 m (200 ft) Baud rates ≤ 9600 bps |
RS-485 | 300 m (984 ft) |
Power Consumption |
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Active | 250 mA (typical) |
Quiescent SDI-12 Mode | < 1.0 mA |
Quiescent RS-232/RS-485 Modes |
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Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.
Product | Compatible | Note |
---|---|---|
CR1000 (retired) | SDI-12 and RS-232. For RS-485, requires an MD485 interface or similar RS-485 to RS-232 interface. | |
CR1000X | SDI-12 and RS-232. For RS-485, requires an MD485 interface or similar RS-485 to RS-232 interface. | |
CR200X (retired) | SDI-12 | |
CR216X (retired) | SDI-12 | |
CR300 (retired) | 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. | |
CR310 | SDI-12 and RS-232. For RS-485, requires an MD485 interface or similar RS-485 to RS-232 interface. | |
CR350 | SDI-12 and RS-232. For RS-485, requires an MD485 interface or similar RS-485 to RS-232 interface. | |
CR5000 (retired) | 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 (retired) | SDI-12 and RS-232. For RS-485, requires an MD485 interface or similar RS-485 to RS-232 interface. | |
CR850 (retired) | SDI-12 and RS-232. For RS-485, requires an MD485 interface or similar RS-485 to RS-232 interface. | |
CR9000X (retired) | SDI-12 and RS-232. For RS-485, requires an MD485 interface or similar RS-485 to RS-232 interface. |
Product | Compatible | Note |
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GRANITE 6 | SDI-12 and RS-232. For RS-485, requires an MD485 interface or similar RS-485 to RS-232 interface. |
CR6 and CR1000X programs that directly read each type of SR50A output (SDI-12, RS-232, RS-485), and a CR1000 program that reads the RS-485 output using an MD485 Multidrop interface. A 107 sensor provides the temperature measurement needed for temperature compensation. The programs use the data filtering method described in the manual.
Number of FAQs related to SR50A-L: 15
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