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Section 4
Page 87
In-Pipe Ultrasonic Sensor
4.11 In-Pipe Ultrasonic Sensor
4.11.1 Mounting the In-Pipe Sensor
• Mount the sensor over the center of the flow stream where the surface
turbulence is minimized (Figure 37).
• Mount the sensor 2 m (82 in.) away from obstructions located in front of
the in-pipe senor to prevent inaccurate liquid level readings (Figure 38).
• Level the sensor using the built-in bubble level.
• Ensure the isolation gasket is in place and the mounting bracket
thumbscrews are finger-tight to avoid sensor ringing.
• Install the sensor within 4.12 m (13.5 ft) of the lowest expected level (the
maximum range of the sensor). The intensity of the echo decreases with
distance at a maximum of 1.31 dB/m (0.4 dB/ft)
Figure 37 End View of In-Pipe
1. Pipe (size may vary) 5. Bracket Thumbscrew (3.17 cm (1.25 in.) long)
2. Mounting Clip 6. Bubble Level
3. Vibration Isolation Gasket 7. Sound Waves
4. Sensor 8. Flow