![]() When a sensor inside the tank gets covered by food particles or toilet tissue it completes the circuit and relays the information to the monitor panel. The black water holding tank is even worse! You have soap scum, grease, food particles, and hair just to name a few. For one minute think about what goes down the kitchen sink, bathroom sink, and shower drains, directly into the gray water holding tank. This is where all the “faulty reading” problems begin. The reason is, when you install a tank sensor through the side of a holding tank a probe sticks out on the inside of the tank to register the tank level when the water reaches the probe inside the tank. When I explained what the tank sensors are you may have noticed I substituted the word sensors with probes at various times. In a perfect world, this is all we need to monitor and know when to empty our RV holding tanks, right? That is wishful thinking on our part. As the content in the tank rises and makes contact with one of the positive tank sensors it completes the circuit which in turn illuminates that tank level reading at the monitor panel. There is a negative tank probe installed at the bottom of the tank in the empty position. Then the probes are wired to their respective positions at the monitor panel. Note: some tank sensors are installed at 1/3, 2/3 and full levels. A sensor is installed at the ¼ tank, ½ tank, ¾ tank and full tank position on the side of each tank. Most tank sensors are permanently installed through the side of the tanks. So the question is, how does the monitor panel in the RV know how full the fresh water, gray water and black water holding tanks are at any given time? The answer is, by way of RV tank sensors or tank probes installed in the fresh water, gray water, and black water holding tanks. RV 101 Tip: For the best results, you want the black water tank nearly full when you empty it, followed by a full gray water tank to help flush and rinse the RV sewer hose. ![]() ![]() Note: Some tank sensors are installed at the 1/3, 2/3 and full levels. ![]() It displays the gray and black water tank levels in ¼, ½, ¾, and full tank increments. To accomplish this, the RV has a monitor panel. While you are camping you need to know how much content is in the holding tanks so you know when it is time to empty them. The gray tank is used for dirty water from the sinks and shower /tub, and the black tank is for waste from the toilet. You guessed it, it is stored in the gray and black water holding tanks. When you travel and camp in an RV the water that goes down the kitchen and bathroom drains, and the waste flushed down the toilet needs to be stored until it can be properly disposed of. Our concern today is with the RV’s gray and black water holding tanks. RVs come equipped with a gray water holding tank, a black water holding tank, and a fresh water holding tank. RV gray and black water holding tanksįor readers not familiar with the inner working of an RV let’s start with RV holding tanks in general. In this post I will explain what the RV holding tank sensors are, how they work, why you sometimes get false tank sensor readings, and what you can do to correct the problem. So today is the day I write about RV holding tank sensors and false tank level readings. I agreed, this is a great topic, and I was surprised when I realized I never wrote an article on RV holding tank sensors article prior to this. She thought this would make a good topic for the ROTV Facebook page. More to the point, it was about why people sometimes get false tank level readings at the monitor panel in the RV. The question was about RV holding tank sensors on the RV’s gray and black water holding tanks. RV Education 101 produces RV how-to segments for the ROTV show. The other day I received an email from a colleague at Rollin On TV (ROTV).
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