Holding tank sensors in RVs and travel trailers often provide inaccurate readings, causing frustration for many mobile homeowners. The typical sensors, usually mounted on the sidewalls of the tanks, are prone to problems such as false positives or negatives due to debris, corrosion, or misalignment.
Common Issues
Debris and Build-Up: Over time, solid waste, grease, or toilet paper can cling to these sensors. This build-up causes consistent false readings, often showing full when the tank is not, or vice versa. Regular cleaning might help, but it won’t eliminate the problem entirely.
Corrosion and Sensor Degradation: Many holding tank sensors are made of materials that are prone to corrosion, especially if the contents are acidic or if there's prolonged exposure to water. Once corroded, they either stop working or give intermittent false readings.
Electrical Problems: Wiring issues can also contribute, where bad connections or shorts lead to incorrect level displays on your monitoring system.
Solutions and Alternatives
Upgrade Sensors: Consider upgrading to more advanced sensors, such as those using ultrasonic technology. These sensors can measure the distance from the sensor to the surface of the liquid, providing a more reliable measurement.
External Sensors: There are sensors available that can be adhered externally to your tank and use technology such as sonar or infrared to provide more accurate measurements. These avoid problems associated with internal buildup and corrosion.
Regular Maintenance: Regularly cleaning tanks and using sensor-friendly chemicals can help maintain accurate readings longer, although this won't solve inherent design flaws.
Visual Checks: When possible, performing a physical check of tank levels if accessible and safely possible can provide confirmation of sensor readings.
Experienced Estimation: Some RVers develop a good sense of how long they can go between dumps based on their usage patterns and the capacity of their tanks, reducing reliance on sometimes faulty sensors.
Dealing with unreliable holding tank sensors is a common reality for many RV dwellers. Upgrading technology or using a combination of methods to verify fill levels can mitigate the inaccuracies and improve the overall RV living experience.