Ultrasonic Depth Sensor - ADS TRITON+ Installation, Operation And Maintenance Manual

2-30 ADS TRITON+ Manual
Based on this information, the sensor determines the peak velocity
of the oncoming flow. ADS's analytical and data processing
software calculates an average velocity from this peak by applying
a user-defined average-to-peak ratio.

Ultrasonic Depth Sensor

The Ultrasonic Depth Sensor with a standard 30-foot (9.1-m) cable
(ADS p/n 8K-CS5-D1-00-30) mounts at the crown of the pipe and
measures ultrasonic depth and air temperature.
This sensor first transmits an ultrasonic signal downward from one
of the crystals on the sensor face that bounces off the flow surface
and returns to the other crystal. The monitor measures the travel
time elapsed between transmission and reception of the reflected
sound signal. Based on the elapsed time and the speed of sound,
the monitor determines the range. The range represents the
distance between the sensor face and flow surface. The monitor
calculates the depth of the flow by subtracting the range from the
pipe diameter. It compensates for the speed of sound in the air
using the temperature recorded by a temperature sensor housed
within the ultrasonic depth sensor.
The ultrasonic depth sensor is located in the front, horizontal
portion of the sensor and has two downward-facing ultrasonic
crystals covered with a clear, moisture-shedding Teflon
Ultrasonic Depth Sensor
®
coating.