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SR50AH-L Heated Sonic Ranging Sensor
Cảm biến đo mức siêu âm Campbell Scientific SR50AH-L
The SR50AH heated sonic ranging sensor provides a non-contact method for determining snow or water depth. It determines depth by emitting an ultrasonic pulse and then measuring the elapsed time between the emission and return of the pulse. An air temperature measurement is required to correct for variations of the speed of sound in air. The SR50AH includes an integrated heater that prevents ice and rime from coating the transducer.
Note: Campbell Scientific recommends model SR50A-316SS-L for marine environments.
Non-contact method for determining snow or water depth
Wide operating temperature range
Integrated transducer heater; rugged enough for rime and ice environments
User-selectable options for output
Uses a multiple echo processing algorithm to help ensure measurement reliability
Compatible with most Campbell Scientific dataloggers
The SR50AH was designed to meet the stringent requirements of measuring depths and uses a multiple echo processing algorithm to help ensure measurement reliability. The addition of a heating element around the transducer prevents ice and rime from coating the transducer with minimal power requirements.
SDI-12, RS-232, and RS-485 output options are available for measuring the SR50AH. Campbell Scientific’s MD485 interface can be used to connect one or more SR50AH 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.
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 (RS-232, RS-485 modes): 1200 to 38400 bps
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
Length: 10.1 cm (4.0 in)
Diameter: 7.5 cm (3 in)
15-ft Cable Weight: 250 g (8.2 oz)
Maximum Cable Length
SDI-12: 60 m (200 ft)
RS-232: 60 m (200 ft); baud rates ≤9600 bps
RS-485: 300 m (984 ft); cable lengths greater than 60 m require a heavier gage wire if the power supply drops below 11 Vdc.
Heater Resistance: 75 ohm
Nominal Operating Voltage: 12 V (ac or dc)a
Maximum Rated Wattage: 3 W
Maximum Rated Voltage: 15 V (ac or dc)
Maximum Operating Temperature: 25°Cb
a - Use a properly conditioned low noise power source. A noisy power source will affect operation of the sensor.
b - Turn the heater power off at temperatures above 25°C. This prevents damage to the sensor and reduces power consumption.