SR50ATH-L Sonic Distance Sensor with Heater and Temperature Sensor

Overview

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.

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 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

The sensor's heater cable cannot be replaced in the field and must be sent to the Service Department for replacement. A Returned Material Authorization is required.

Images

SR50ATH-L with cable
SR50ATH-L with cable
SR50ATH-L with cable
Image shown is an SR50A-316SS-L mounted to a 19517 SR50A Mounting Kit (sold separately).<br />The 19517 SR50A Mounting Kit works with all SR50A models.
SR50ATH-L mounted to a 19517 SR50A Mounting Kit and crossarm (sold separately)
Bottom view of SR50ATH-L mounted to a 19517 SR50A Mounting Kit and crossarm (sold separately)
Image shows an 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).<br />The SR50ATH mounts in similar manner.

Detailed 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.

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)

Compatibility

Note: The following shows notable compatibility information. It is not a comprehensive list of all compatible or incompatible products.

Data Loggers

Product Compatible Note
CR1000 (retired) SDI-12 and RS-232. For RS-485, requires an MD485 interface or similar RS-485 to RS-232 interface.
CR1000X SDI-12 and RS-232. For RS-485, requires an MD485 interface or similar RS-485 to RS-232 interface.
CR300 SDI-12 and RS-232. For RS-485, requires an MD485 interface or similar RS-485 to RS-232 interface.
CR3000 (retired) SDI-12 and RS-232. For RS-485, requires an MD485 interface or similar RS-485 to RS-232 interface.
CR310 SDI-12 and RS-232. For RS-485, requires an MD485 interface or similar RS-485 to RS-232 interface.
CR350 SDI-12 and RS-232. For RS-485, requires an MD485 interface or similar RS-485 to RS-232 interface.
CR6 SDI-12, RS-232, and RS-485
CR800 (retired) SDI-12 and RS-232. For RS-485, requires an MD485 interface or similar RS-485 to RS-232 interface.
CR850 (retired) SDI-12 and RS-232. For RS-485, requires an MD485 interface or similar RS-485 to RS-232 interface.

Miscellaneous

Product Compatible Note
Granite 6 SDI-12 and RS-232. For RS-485, requires an MD485 interface or similar RS-485 to RS-232 interface.

Additional Compatibility Information

Data Logger Considerations

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

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