Once you have found the best pipe section to clamp bluebot onto, there can be no obstructions (dirt, grime, etc) that would get in the way of a tight snug clamp to the pipe. See article picking good pipe
Sand the pipe using the included sand paper disc.
Use the provided towel to wipe any free debris from the pipe.
Remove all dust from the pipe with the included towel. Dirt or even fine dust may affect the ultrasonic signal quality resulting in lower accuracy. It is key to assure the ultrasonic sensor pads touch the pipe very tightly so the ultrasonic signal can measure flow.
If you would like to speak to a member of the bluebot team, simply navigate to Settings > Support from within the app and choose your preferred method of communication. Otherwise, you can email email@example.com