SR50AT-L Sonic Distance Sensor with Temperature Sensor
Temperature-Compensated Output
weather applications water applications energy applications gas flux & turbulence applications infrastructure applications soil applications

Overview

The SR50AT-L is an acoustic distance sensor that measures the elapsed time between emission and return of an ultrasonic pulse. This measurement can be used to determine snow or water depth. The SR50AT-L includes an external temperature sensor and outputs a temperature-corrected distance reading, eliminating the need for further post-processing.

Note: Campbell Scientific recommends model SR50AT-316SS-L for marine environments.

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Benefits and Features

  • Integrated temperature probe for providing temperature correction of measurements
  • Non-contact method for determining snow or water depth
  • Wide operating temperature range
  • Rugged enough for harsh environments
  • User-selectable options for output
  • Uses a multiple echo processing algorithm to help ensure measurement reliability
  • Compatible with most Campbell Scientific dataloggers

Images

SR50AT-L with cable
SR50AT-L with cable
SR50AT-L with cable
Image shown is an SR50A-316SS-L mounted to a 19517 SR50A Mounting Kit (sold separately).<br />The SR50A and the SR50AT use the same chassis design.
SR50AT-L mounted to a 19517 SR50A Mounting Kit and crossarm (sold separately).<br />MetSpec RAD06 multi-plate shield is shown being used to house the temperature sensor (sold separately).
SR50AT-L mounted to a<br />19484 SR50A Mounting Stem<br />(sold separately)
SR50AT-L mounted to a crossarm using 19484 SR50A Mounting Stem and 17953 1 x 1 inch Nu-Rail crossover<br />fitting (sold separately). MetSpec RAD06 multi-plate shield is shown being used to house the temperature<br />sensor (sold separately).

Detailed Description

The SR50AT is an identical unit to the SR50A with the addition of an external temperature sensor. The temperature sensor comes with a standard ten-foot lead and requires a 6-plate Gill radiation shield. The SR50AT will output a temperature-corrected distance reading, eliminating the need for further post-processing, as well as a separate temperature reading.

The SR50AT was designed to meet the stringent requirements of measuring snow depths and uses a multiple echo processing algorithm to help ensure measurement reliability. The SR50AT is compatible with all current Campbell Scientific dataloggers, as well as many other data acquisition systems. An air temperature measurement is required to correct for variations of the speed of sound in air. Either the SR50AT or an existing on-site air temperature sensor can be used. The SR50AT is available with a heater option for locations where rime ice is a problem.

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 datalogger’s 12 Vdc power supply)
Measurement Range 0.5 to 10 m (1.6 to 32.8 ft)
Beam Acceptance Angle ~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 (-49°F to +122°F)
Compliance CE compliant
Temperature Accuracy
  • ±0.2° at 0° to 50°C (32° to 122°F)
  • ±0.75° at -45° to 0°C (-49˚ to +32˚F)
Cable Type 4 conductor, 2-twisted pair, 22 AWG, Santoprene
Diameter 7.6 cm (3 in.)
Length 10.1 cm (4 in.)
Weight 375 g (13.2 oz) without cable
Cable Weight 250 g (8.2 oz) for a 4.57-m (15-ft) cable

Power Consumption

Active 250 mA (typical)
Quiescent SDI-12 Mode < 1.0 mA The quiescent current draw is less than 1.25 mA if the BAUD rate is 9600 BAUD or less
RS-232/RS-485 Mode < 2.0 mA

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) 9600 BAUD or less
RS-485 300 m (984 ft)

Compatibility

Datalogger Considerations

One single-ended channel per probe is required; an excitation channel can be shared by several probes.

Compatible Contemporary Dataloggers (SDI-12)

CR200(X) Series CR800/CR850 CR1000 CR3000 CR9000X CR300 Series CR6

Compatible Retired Dataloggers (SDI-12)

CR500 CR510 CR10 CR10X 21X CR23X CR9000 CR5000 CR7X

Compatible Contemporary Dataloggers (RS-232)

CR200(X) Series CR800/CR850 CR1000 CR3000 CR9000X CR300 Series CR6

Compatible Retired Dataloggers (RS-232)

CR500 CR510 CR10 CR10X 21X CR23X CR9000 CR5000 CR7X

Compatible Contemporary Dataloggers (RS-485)

CR200(X) Series CR800/CR850 CR1000 CR3000 CR9000X CR300 Series CR6
* * * * *

Compatible Retired Dataloggers (RS-485)

CR500 CR510 CR10 CR10X 21X CR23X CR9000 CR5000 CR7X
*

*Requires an MD485 interface or similar RS-485 to RS-232 interface.

Downloads

SR50A/AT OS v.1.3 (52 KB) 08-22-2007

Current SR50A / AT firmware.
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