![]() ![]() Anything that connects the sensor heads to one another on the inside of the tank, like non RV approved toilet paper, will cause incorrect readings. Yes, all the free flowing contents drained but that doesn’t mean you don’t have some stow away materials. ![]() How is this possible, if there is nothing in the tank? Well, just because you dumped and flushed your tank doesn’t mean there is nothing in it. As we explained the sensors simply complete the circuit in this system and if the system is reading 2/3 full when it is empty it is a good bet the sensor is providing a ground. Most inaccurate readings are going to indicate that the tank is more full than it is in reality, and that is because of the nature of electricity, not the sensors. It just hurts the sensors feelings and makes for an awkward apology when the real culprit is discovered. Again, blaming the sensor doesn’t usually do much good. That is a basics of the correct operation of a holding tank sensor, so what about sensors that read incorrectly. The monitor panel provides the hot when you depress any of the test buttons and, if they are grounded, the corresponding indictor lights illuminate, if not grounded no lights.). (Quick electrical review – at minimum any electrical system needs a hot and a ground to work. Basically as the tank fills, the contents electrically ground the sensors allowing their indicator lights to display on the monitor panel. In the example above an accurate reading would be 1/3 full, as the tank contents have not risen past the level of the 2/3 sensor quite yet. To accomplish this the um…material held in the tank will “ground” each sensor as the tank fills past them. Most tanks provide a reading at four points empty, one-third full, two-thirds full, and the dreaded full. They are mounted through the sidewall of a holding tank so that each sensor’s head is on the inside of the tank and the sensors physically ascend or descend in a line on the body of the holding tank. No, in fact your sensors are probably working and they are working overtime, it is the accuracy of their efforts that are in question.Ī traditional tank sensor completes the circuit in a simple low voltage electrical system. Don’t worry, the sensors are not like your brother in law who is happy to lie on the couch watching game shows and eating nachos when he is supposed to be job hunting. Great! The holding tank sensors aren’t working. You know you dumped it before you left the last campground, but your monitor panel reads full. Tank sensors take a lot of the blame when a monitor panel consistently reads incorrectly, but they are rarely the culprits. This can be cleaned off with standard anti-grease detergent and or a chemical or enzyme based holding tank digestant treatment. When RV holding tank sensors incorrectly read full, it is typically due to residue build-up connecting the sensors. ![]()
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