SR50ATH

Name: SR50ATH
Brand: Campbell Scientific
SKU: 31340F
Availability: InStock

Sonic Distance Sensor with Heater and Temperature Sensor

SR50ATH

Limited availability

Sonic Distance Sensor with Heater and Temperature Sensor

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Model:: SR50ATH
Item Number:: 31340F
Warranty:: 2 years

Overview

Note: This product has limited availability. Please consider the SnowVue™10 Digital Snow-Depth Sensor for snow-depth measurements and the TempVue™20 Pt100 Digital Air Temperature Sensor or HygroVue™10 Digital Temperature and Relative Humidity Sensor with M12 Connector for air temperature measurements.

The SR50ATH is a sonic distance sensor with an integrated external temperature probe and heater. Sonic sensors determine distance by emitting an ultrasonic pulse and then measuring the elapsed time between the emission and return of the pulse. The temperature probe allows the SR50AT series to output temperature-corrected values (speed of sound varies with temperature). The integrated heater prevents ice and rime from coating the transducer.

Technical Description

The SR50ATH is an identical unit to the SR50A with the addition of an external temperature sensor and transducer heater. The temperature sensor requires a six-plate radiation shield. The addition of a heating element around the transducer prevents ice and rime from coating the transducer with minimal power requirements. The SR50ATH outputs a temperature-corrected distance reading, eliminating the need for further post-processing, as well as a separate temperature reading.

The SR50ATH was designed to meet the stringent requirements of measuring snow depths and uses a multiple echo processing algorithm to help ensure measurement reliability. The SR50ATH is compatible with all current Campbell Scientific data loggers, as well as many other data acquisition systems.

Benefits

Integrated temperature probe for providing temperature correction of measurements
Non-contact method for determining snow 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 data loggers

Specifications

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 data logger’s 12 Vdc power supply)
Quiescent Power Consumption in SDI-12 Mode: < 1.0 mA
without heater
Quiescent Power Consumption in RS-232/RS-485 Mode: < 1.25 mA
(≤ 9600 bps) without heater
< 2.0 mA
(> 9600 bps) without heater
Active Power Consumption: 250 mA typical
without heater
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).
Operating Temperature Range: -45° to +50°C
Temperature Accuracy: ±0.2°C
(at 0° to 50°C)
±0.75°C
(at -45° to 0°C)
Compliance: CE compliant
Diameter: 7.5 cm
(3 in.)
Length: 10.1 cm
(4.0 in.)
Weight: 375 g
(13.2 oz) without cable
Cable Weight: 250 g
(8.2 oz) for a 4.57-m (15-ft) cable

Heater

Heater Resistance: 75 ohm
Nominal Operating Voltage: 12 V
(ac or dc) Use a properly conditioned low-noise power source. A noisy power source will affect operation of the sensor.
Maximum Rated Wattage: 3 W
Maximum Rated Voltage: 15 V
(ac or dc)
Maximum Operating Temperature: 25°C
(Turn the heater power off at temperatures above 25°C. This prevents damage to the sensor and reduces power consumption.)

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
(200 ft)
RS-232: 60 m
(200 ft) Baud rates ≤ 9600 bps
RS-485: 300 m
(984 ft)