SR50AT-Series Sonic Ranging Sensors
4
5. Select any other sensors you have, then finish the remaining
Short Cut
steps to complete the program. The remaining steps are outlined in
Short
Cut Help
, which is accessed by clicking on
Help
|
Contents
|
Programming Steps
.
6. If
LoggerNet
,
PC200W
,
PC400
, or
RTDAQ
is running on your PC, and the
PC to datalogger connection is active, you can click
Finish
in
Short Cut
and you will be prompted to send the program just created to the
datalogger.
7. If the sensor is connected to the datalogger, as shown in the wiring
diagram in step 4, check the output of the sensor in the datalogger support
software data display to make sure it is making reasonable measurements.
5. Overview
The SR50AT-series sensors measure the distance from the sensor to a target.
They determine the distance to a target by sending out ultrasonic pulses
(50 kHz) and listening for the returning echoes that are reflected from the
target. The time from transmissions to return of the echo is the basis for
obtaining the distance measurement.
Since the speed of sound in air varies with temperature, an independent
temperature measurement is required to compensate the distance reading for
these sensors. The SR50AT makes a temperature measurement and calculates a
corrected distance reading.
The SR50AT-series sensors are capable of picking up small targets or targets
that are highly absorptive to sound, such as low density snow. They use a
unique echo-processing algorithm to help ensure measurement reliability. If
desired, these sensors can also output a data value indicative of measurement
quality.
The SR50AT-series sensors meet the stringent requirements of snow depth
measurement that make them well suited for a variety of other applications.
The SR50AT and SR50ATH have rugged aluminum chassis that withstand
many environments, but the aluminum chassis is not suitable for marine (salty)
environments.
The SR50AT-316SS has a stainless-steel chassis with a
parylene-coated transducer head that allows the sensor to be used in marine or
other corrosive environments. The SR50ATH includes a heater that prevents
ice from coating the transducer, but the heater increases the power
consumption of the sensor; see Appendix
(p. F-1)
, for more information. Throughout this document SR50AT will refer to
all of the models unless specified otherwise.
SDI-12, RS-232, and RS-485 output options are available for measuring the
SR50AT. The SR50AT is factory configured as an SDI-12 sensor (address 0)
because Campbell dataloggers typically use the SDI-12 format. To use the
RS-232 or RS-485 format, three jumpers inside the SR50AT need to be moved
Disassembly/Assembly Procedures
(p. 16)
, and Appendix
(p. C-1)
). Refer to Appendix
(p. D-1)
, for more information
.
