SR50AT
SR50AT
Limited availabilitySonic Distance Sensor with Temperature Sensor
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 SR50AT 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 depth. The SR50AT includes an external temperature sensor and outputs a temperature-corrected distance reading, eliminating the need for further post-processing.
Note: The main image shows an SR50AT mounted to a 19484 SR50A Mounting Stem, which is sold separately.
Key Advantages
Technical Description
The SR50AT is an identical unit to the SR50A with the addition of an external temperature sensor. The temperature sensor requires a six-plate 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 data loggers, 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.
Benefits
- Integrated temperature probe for providing temperature correction of measurements
- Non-contact method for determining snow 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 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)
- 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).
- Operating Temperature Range
- -45° to +50°C
- Compliance
- CE compliant
- Temperature Accuracy
- ±0.2°
(at 0° to 50°C)
±0.75°(at -45° to 0°C)
- 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)
Accessories
(12)SR50ATCBL
Replacement SR50AT Cable
Orderable19517
SR50A and SnowVue Mounting Kit
Orderable19484
SR50A and SnowVue Mounting Stem
Orderable17953
1- x 1-in. Nu-Rail Crossover Fitting
OrderableCM221
Right-Angle Mounting Kit
OrderableCM230
Adjustable Inclination Mounting Kit
OrderableCM230XL
Adjustable Angle Mounting Kit, Extended Length
OrderableRAD06
6-Plate Solar Radiation Shield
Orderable41303-5A
6-Plate Solar Radiation Shield
Orderable33815
SDI-12 Terminal Bus Kit
Orderable39120
DIN Rail Terminal Kit with 2 Terminals and 5 Wires
Orderable39642
SDI-12 DIN Rail Terminal Bus Kit without Mounting Bracket
Orderable
Common Accessories
(11)SR50ATCBL
Replacement SR50AT Cable
The SR50ATCBL cable may be ordered to add or replace a cable
Orderable19517
SR50A and SnowVue Mounting Kit
This mounting kit attaches directly to a CM206 crossarm or user-supplied pole with a 1-in. to 1.75-in. outside diameter.
Orderable19484
SR50A and SnowVue Mounting Stem
This mounting stem attaches to a sensor. The stem is then attached to the CM206 crossarm or a user-supplied pole via a CM220 mount, 17953 Nu-Rail fitting, or CM230 Adjustable Inclination Mount.
Orderable17953
1- x 1-in. Nu-Rail Crossover Fitting
The 17953 connects a vertical 1-inch pipe to a horizontal 1-inch pipe. The 17953 is typically used to attach a sensor with a 1-inch vertical pipe mount to a CM202, CM204, or CM206 crossarm. This usage provides functionality similar to the CM220 right-angle mounting bracket.
OrderableCM221
Right-Angle Mounting Kit
The CM221 mounts a pipe or tube at 90° to another pipe or tube. It is typically used to attach a sensor with a vertical pipe (including most wind sensors) to a crossarm. The cast aluminum, right-angle mounting bracket has 3.8 cm (1.5 in.) U-bolts and hardware and will accommodate tubing with a 1- to 1.5-in. outer diameter.
OrderableCM230
Adjustable Inclination Mounting Kit
The CM230 is an adjustable mount to point directional antennas or sensors at a specific target. The inclination can be adjusted to any angle from horizontal to vertical, supporting the use of upward-directed antennas or downward-directed infrared thermometers or snow-depth sensors.
OrderableCM230XL
Adjustable Angle Mounting Kit, Extended Length
The CM230XL is an adjustable mount to point directional antennas or sensors at a specific target. The inclination can be adjusted to any angle from horizontal to vertical, supporting the use of upward-directed antennas or downward-directed infrared thermometers or snow-depth sensors.
Orderable41303-5A
6-Plate Solar Radiation Shield
The 41303-5A is a naturally aspirated, 6-plate radiation shield. Its louvered construction allows air to pass freely through the shield, serving to keep the probe at or near ambient temperature. The shield's white color reflects solar radiation.
OrderableRAD06
6-Plate Solar Radiation Shield
When exposed to sunlight, the SR50AT must be housed in a radiation shield. The RAD06 uses a double-louvered design that offers improved sensor protection from driving rain, snow, and insect intrusion. It also has lower self-heating in bright sunlight combined with higher temperatures (> 24°C (~75°F)) and low wind speeds (< 2m/s (~4.5 mph)), providing a better measurement.
Orderable39120
DIN Rail Terminal Kit with 2 Terminals and 5 Wires
The 39120 provides the needed DIN rail terminals, separator, and wires to connect any product to a data logger or other peripheral that requires five wires for connection. This kit provides the following wires: black, green, red, white, and clear. The color-coding of these wires matches the wire coloring of the product for ease in connection, maintenance, and troubleshooting.
Orderable39642
SDI-12 DIN Rail Terminal Bus Kit without Mounting Bracket
The 39642 makes it easier for you to connect wires from multiple SDI-12 sensors into one set of terminals on a data logger. The 39642 uses six DIN-rail mountable (pn 27479), 6-wire terminal blocks. The 39642 is a jumper that electrically connects two terminal blocks together at a time (pn 32918). This setup allows up to 11 SDI-12 sensors to be connected to one set of terminals on a data logger.
Orderable
Replacement Parts
(4)SR50ATCBL
Replacement SR50AT Cable
The cable may be ordered to replace a cable that has become lost or damaged.
Orderable19486
SR50A or SR50AT Transducer Maintenance Kit
The 19486 provides one replacement transducer with connector, an O-ring, six #4091 desiccant bags, and two #905 desiccant bags. The transducer can typically be replaced in the field by the customer (assumes reasonably favorable weather conditions).
Orderable42816
1/2-Unit Desiccant Bags (quantity of 10)
The 42816 desiccant is used to desiccate small subassemblies. For example, the KH20 Krypton Hygrometer and the base of the CR3000 Measurement and Control Datalogger each require two bags. Multi-packs are recommended for customers who need to desiccate multiple enclosures or systems.
Orderable42945
1 g Bag of Desiccant (quantity of 10)
The 42945 consists of 10 1-g bags of desiccant for drying the air in the area above an instrument. Six bags of the desiccant are used to dry the air in the area above the transducer. Purchase of additional bags is recommended to use as spares or to rotate bags with time.
Orderable
Ships With
(2)- Test Report
SR50ATCBL
Replacement SR50AT Cable
Orderable
Compatibility
Data Logger Considerations
One single-ended channel per probe is required; an excitation channel can be shared by several probes.
Compatible Products
(3)CR6
High-Capacity Data Acquisition System
OrderableNotesSDI-12, RS-232, and RS-485
CR310
Measurement and Control Datalogger
OrderableNotesSDI-12 and RS-232. For RS-485, requires an MD485 interface or similar RS-485 to RS-232 interface.
CR350
Measurement and Control Datalogger
OrderableNotesSDI-12 and RS-232. For RS-485, requires an MD485 interface or similar RS-485 to RS-232 interface.
Related Resources
Documents
- Brochure
SR50AT Sonic Ranging Sensor
June 2026
View Document - Manual
SR50A-Series Sonic Ranging Sensors
September 2021
View Document - Compliance
SR50AH, SR50ATH, SR50A, and SR50AT UK Declaration of Conformity
March 2022
View Document - Compliance
SR50AH, SR50ATH, SR50A, and SR50AT EU Declaration of Conformity
March 2022
View Document
Showing 4 of 5 results
See all DocumentsDownloads
- SR50AT example programsv1Login required
January 22, 2020
Software ApplicationsCR6 and CR1000X programs that directly read each type of SR50AT output (SDI-12, RS-232, RS-485), and a CR1000 program that reads the RS-485 output using an MD485 Multidrop interface. The programs use the data filtering method described in the manual.
- SR50A/AT OSv1.3Login required
August 22, 2007
OS and FirmwareCurrent SR50A / AT firmware.