SR50ATH-L Sonic Ranging Sensor with Heater and Temperature Sensor

Overview

The SR50ATH is a sonic ranging sensor with an integrated external temperature probe and heater. Sonic ranging 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 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 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 comes with a standard ten-foot lead and requires a 6-plate Gill 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 dataloggers, 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 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
Compliance CE compliant
Temperature Accuracy
  • ±0.2°C (at 0° to 50°C)
  • ±0.75°C (at -45° to 0°C)
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

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.


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