ADS Environmental Services FlowShark Pulse QR 775004 A1 - Manual (Page 36)

4-6 ADS FlowShark Pulse O&M Manual
Air-Ultrasonic Depth Sensor
An air-ultrasonic depth sensor uses horizontal sensor crystals to determine the
distance (range) from the sensor to the flow surface based on the time difference
between transmitting and receiving a pulse reflected off the flow surface (the transit-
time method). The flow depth is calculated by subtracting the range and the sensor
offset from the pipe height. The sensor offset represents the distance from the top of
the pipe to the sensor crystal position.
The air-ultrasonic sensor is not effective for depth measurement when the sensor
becomes submerged or depths occur within 4 inches of the sensor crystal, known as
the deadband.
1 Plug with spigot nut, IP68 (only for PCM)
2 Sensor cable
3 Sensor body
4 Ground plate
5 Cable gland
6 Sensors (crystals) for depth measurement using air-ultrasonic
Figure 4-7 Air ultrasonic sensor