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Old 09-10-2013, 03:41 PM   #11
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30 Gallons of POOH what kind of animal can do that kind of damage in a week??? I don't think they see that kind of volume at the Zoo's Rhino cage.
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Old 09-11-2013, 07:07 AM   #12
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30 Gallons of POOH what kind of animal can do that kind of damage in a week??? I don't think they see that kind of volume at the Zoo's Rhino cage.
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Old 09-14-2013, 12:40 PM   #13
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When you have time, you can do a little experiment to determine what the full light on the sensor actually means. Once you have dumped your black tank, start filling your tank by pouring water down the toilet using a 1 gallon jug. Check how many gallons have gone in when the sensor shows 1/3, 2/3 and 3/3 full. I tried this and have it written down in the rv. I think mine was at 22 gallons when the sensor panel showed full - the tank is 32.5 gallons!
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Old 09-15-2013, 01:14 PM   #14
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When the black tank is getting too full, it's a good time to go on that diet you know you should be on.
Eat less, poop less...............as the saying (that I just made up) goes.
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Old 09-17-2013, 12:38 PM   #15
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When you have time, you can do a little experiment to determine what the full light on the sensor actually means. Once you have dumped your black tank, start filling your tank by pouring water down the toilet using a 1 gallon jug. Check how many gallons have gone in when the sensor shows 1/3, 2/3 and 3/3 full. I tried this and have it written down in the rv. I think mine was at 22 gallons when the sensor panel showed full - the tank is 32.5 gallons!
I don't believe it works as you are thinking. The lights indicate each 1/3 of the tank is crossed (on mine it is 1/4s). Thus, that last light
indicates you are STARTING the last 1/3 of the capacity, by definition, because you filled it until you just saw it light up. Thus, 2 3rds of 32.5 is 21.6 gal, which actually makes your gauge surprisingly accurate.
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Old 09-17-2013, 04:19 PM   #16
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I don't believe it works as you are thinking. The lights indicate each 1/3 of the tank is crossed (on mine it is 1/4s). Thus, that last light
indicates you are STARTING the last 1/3 of the capacity, by definition, because you filled it until you just saw it light up. Thus, 2 3rds of 32.5 is 21.6 gal, which actually makes your gauge surprisingly accurate.
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Old 09-17-2013, 07:38 PM   #17
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I don't believe it works as you are thinking. The lights indicate each 1/3 of the tank is crossed (on mine it is 1/4s). Thus, that last light
indicates you are STARTING the last 1/3 of the capacity, by definition, because you filled it until you just saw it light up. Thus, 2 3rds of 32.5 is 21.6 gal, which actually makes your gauge surprisingly accurate.
I think we're thinking the same thing, which is exactly why I did the measurement. My panel is marked E, 1/3, 2/3, F. After measuring I know that E means I have 0 - 6 gal, 1/3 means I have somewhere between 6 gal and 13 gal, 2/3 means I have between 13 gal and 22 gal. F means I have 22+ gal. The volume delta for each LED is not the same - presumably because the sensors are fitted without taking into account the shape of the tanks.
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Old 09-17-2013, 08:05 PM   #18
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I think we're thinking the same thing, which is exactly why I did the measurement. My panel is marked E, 1/3, 2/3, F. After measuring I know that E means I have 0 - 6 gal, 1/3 means I have somewhere between 6 gal and 13 gal, 2/3 means I have between 13 gal and 22 gal. F means I have 22+ gal. The volume delta for each LED is not the same - presumably because the sensors are fitted without taking into account the shape of the tanks.
I have actually wondered if these are all capacitive gauges, which most of the new offerings appear to be. This is a method by which a metal disk is placed external to the tank, and it is measuring the capacitience of the water through the wall of the tank. The reason it matters is that the capacitive gauge is going to be calibrated. There is no real exact sensing of the level, it is going to be sensing the level according to when the capacitence of the sensor reaches a set level.

If that is true, it seems possible you might be able to calibrate the thing.
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Old 09-17-2013, 09:44 PM   #19
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The expensive ones may be, but the cheap sensors on most rigs are just probes that make electrical contact via the "liquid". That is why their readings are not very reliable - if toilet paper or other nasties get stuck on the probes they can indicate a non empty tank even if it is empty. Using a black tank flush helps prevent this to some extent.
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Old 09-20-2013, 02:16 PM   #20
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The expensive ones may be, but the cheap sensors on most rigs are just probes that make electrical contact via the "liquid". That is why their readings are not very reliable - if toilet paper or other nasties get stuck on the probes they can indicate a non empty tank even if it is empty. Using a black tank flush helps prevent this to some extent.
I got my tank flusher to work (quickie flush). It seemed to be flushing an endless amount of crud out. The camper has only been used twice! I think it is pushing a lot of excess silicone sealant and other manufacturing swarf out.
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