Quick Answer
A poor ultrasonic signal usually means Bluebot isn’t making clean contact with the pipe, the pipe isn’t ideal, or the app settings don’t match the actual installation. Most issues are resolved by improving pipe contact, alignment, or correcting the pipe type in the app.
What Is Ultrasonic Signal?
Ultrasonic signal measures how well Bluebot’s sensors can send and receive sound waves through the pipe and water inside it. A strong signal is required for accurate flow readings.
In simple terms:
Clean pipe + tight fit + correct alignment = good signal.
When Should I Worry About Signal Quality?
You may need to take action if:
The app shows Poor or Weak Signal in settings
You are not getting accurate readings
Most Common Causes (and Fixes)
1. The Device Isn’t Snug Against the Pipe
Why it matters:
Even a small air gap weakens the ultrasonic signal.
What to do:
Install on at least 4 inches of straight pipe
Make sure the device is tightly clamped
After clamping, give the device a firm squeeze to close any gaps
2. The Pipe or Pads Are Dirty
Why it matters:
Paint, dirt, grime, or debris block ultrasonic transmission.
What to do:
Sand the pipe using the included sandpaper
Wipe clean with the microfiber cloth (slightly damp works best)
Remove the device and inspect the pads
Clean pads with warm water and mild soap, or replace them if dirty
3. Pads Picked Up Dirt From Multiple Install Attempts
Why it matters:
Ultrasonic pads are sticky by design and easily collect debris.
What to do:
Use the included silver C-holders to prop the clamps open
Remove the old pads
Install a fresh set of replacement pads directly over the clear sensor windows
4. Installed on the Wrong Pipe
Common mistakes:
Hot water line instead of cold
Gas line instead of water line
Partially full or empty pipe
What to do:
Confirm the pipe is cold and pressurized
Never install on gas lines
If unsure, locate the main shutoff valve — this usually confirms the main water line
5. Pipe Has Internal Scale or Corrosion
Most common in:
Older homes (pre-1970)
Areas with hard water
Galvanized or older copper pipes
Why it matters:
Internal buildup thickens the pipe wall and weakens the signal.
What to do:
Try a different section of pipe
Consider a plumber inspection if corrosion is suspected
6. Pipe Size Is Not Supported
Bluebot supports specific pipe sizes and materials.
What to do:
Confirm your pipe size and type are supported
Review the Compatibility & Specifications article if unsure
Alignment Issues
Device Is Angled or Off-Center
Why it matters:
Sensors must sit directly over the pipe centerline.
What to do:
Remove the device
Reinstall it straight over the pipe
Use the “^” alignment notches on both sides as guides
Installed Over a Fitting or Elbow
Why it matters:
Fittings and bends cause turbulent flow, which affects accuracy.
What to do:
Move the device to a longer straight section
If outside space is limited, consider installing indoors near the water heater or filtration system (on the cold line)
Fix During Setup
Restart the setup process
Remove the device from your dashboard
Complete the site survey again
Select the correct pipe type before scanning
Still Seeing Poor Signal?
If you’ve:
Cleaned the pipe and pads
Confirmed alignment and pipe type
Verified the pipe is correct and pressurized
…and signal is still poor, contact Bluebot Support or send a photo of your install location. We’re happy to help.