U-Tube Manometer
What is this device?
The device you are seeing is a U-Tube Manometer. This small, U-shaped tube filled with liquid measures pressure or airflow within your mitigation system. Its purpose is straightforward: it provides a quick and easy readout to verify that the system is functioning properly.
Key Functions
The liquid in both arms of the manometer should not be at the same level.
If the levels are both at "0," it indicates that the fan and mitigation system are unable to create a pressure field.
Possible Issues Indicated by the Manometer
If you see equal liquid levels or levels that do not indicate normal pressure differentials, it could mean one of the following:
Radon Fan Malfunction: The fan may be burned out, blocked, or unable to draw sufficient power.
System Damage: There may be large amounts of air entering the system, preventing the creation of a pressure field. This could be due to:
A cracked PVC pipe.
Compromised lining in your sub-membrane depressurization system.
Recent home renovations affecting airflow.
Common Misconceptions
Many customers confuse the U-Tube Manometer with an active radon monitor.
Understanding the Readings
The liquid levels in the U-Tube Manometer should be uneven. A normal functioning radon system will create pressure differentials that cause one side of the manometer to be between 0.5 to 2 inches higher than the other side.
If the difference is less than 0.5 inches, your system may not be drawing enough air, potentially affecting its ability to reduce radon levels.
If the difference exceeds 2.0 inches, your system may be pulling too much air, indicating that large amounts of fresh air are entering from another source.
Note: These are general guidelines. Your system may have been designed intentionally, and the readings on the manometer may not tell the whole story.
Important Reminder
The height of the columns on either side of the manometer should NOT be the same.
Clarification on Radon Levels
Lastly, it's essential to note that the U-Tube Manometer does not measure radon levels in your home or within the system. We've received calls from concerned customers who see a reading around 2 on their manometer. While we appreciate their vigilance regarding radon, we assure them that these numbers are indicators of system functionality, not radon levels.
