The SR50A is a rugged acoustic sensor for measuring the distance from the sensor to a target. This sensor is typically used for snow depth or water depth measurements, but it is well-suited for other uses. Because the speed of sound in air varies with temperature, an independent temperature measurement is required to compensate the distance reading. A simple calculation is applied to initial readings for this purpose.
For more information go to: https://www.campbellsci.com/sr50a
| SR50A-L: Sonic Distance Sensor | |
| Measurement Time | < 1.0 s |
| 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) |
| Measurement Range | 0.5 to 10 m (1.6 to 32.8 ft) |
| 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 |
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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 (196.9 ft) |
| RS-232 | 30 m (98.4 ft) Baud rates ≤ 9600 bps |
| RS-485 | 300 m (984.3 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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