Campbell Scientific SR50A Distance Sensor - Manual (Page 7)

SR50A Sonic Ranging Sensor
1. Specifications
Power Requirements: 9 to 18 Vdc
Power Consumption: Quiescent
SDI-12 Mode < 1.0 mA
RS-232/RS485 Mode < 2.25 mA Note1
Peak Measurement Current
250 mA typical
Measurement Time: Less than 1.0 second
Selectable Outputs: SDI-12 (version 1.3)
RS-232 (1200 to 38400 bps)
RS-485 (1200 to 38400 bps)
Measurement Range: 1.6 to 32.8 ft (0.5 to 10 m)
Accuracy: ±0.4 in (±1 cm) or 0.4% of distance to
target, whichever is greater.
Accuracy specification excludes errors in
the temperature compensation.
Resolution: 0.01 in (0.25 mm)
Required Beam Angle Clearance: 30°
Operating Temperature: -45° to +50°C
Maximum Cable Length: SDI-12 196.9 ft (60 m)
RS-232 (9600 bps or less) 98.4 ft (30 m)
RS-485 984.3 ft (300 m) Note2
Cable Type: 4 conductor, 2-twisted pair, 22 AWG,
Santoprene jacket
Dimensions: Length 4 in (10.1 cm)
Diameter 3 in (7.6 cm)
Weight:
Sensor only 0.88 lbs (0.4 kg)
Cable (SR50A) 15 feet 0.55 lbs (0.25 kg)
1: The quiescent current draw is less than 1.25 mA if the baud
rate is 9600 bps or less. NOTES
2: Power supply must not drop below 11.0 Volts or heavier
gauge wire is required.
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