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Old 07-14-2015, 02:10 PM   #1
cqr
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Tank level sensors

My tank grey & black tank sensors are not reading correctly. Showing near full after I empty tanks. Any suggestions?
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Old 07-14-2015, 02:40 PM   #2
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Ignore them.
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Old 07-14-2015, 02:43 PM   #3
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Quote:
Originally Posted by Gary RVRoamer View Post
Ignore them.
Finding out that myself.
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Old 07-14-2015, 02:52 PM   #4
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CQR,
Try back flushing your black tank using a "Flush King" www.flushking.com The sludge in the tank on the sensors is causing the misreading. If you want other tips go to: www.allprowaterflow.com


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Old 07-14-2015, 02:59 PM   #5
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You didn't say which rig you have .....but if you have the Aladdin system there is a calibration you can do to see if that is the problem.

the URL below will download an '04 Aladdin tank interface module doc with the sensor calibration instructions.

https://www.google.com/url?sa=t&rct=...97653015,d.dGo
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Old 07-14-2015, 03:09 PM   #6
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I agree with another post: Ignore them. I have had several RVs and none of them seem to do well. I currently have a Winnebago and they are supposed to be based on outside the tank - but still not reliable. Just look at the calendar or come up with a schedule if long term camping. Tank censors are just not there yet in my view.
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Old 07-14-2015, 04:26 PM   #7
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The fresh water gauge works well on mine so when it gets down under a quarter tank I figure it is about time to drain the tanks. I don't connect to park water unless filling the tank. I've had four motorhomes and one 5th wheel and never did the black/gray gauges work on any of them.
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Old 07-14-2015, 05:08 PM   #8
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We are on RV number six. The first four had monitoring systems that did not work. Our last two have been American Coaches with oem Sensa Tank Leveling Monitoring Systems. This system has worked flawlessly on both our coaches.
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Old 07-14-2015, 06:33 PM   #9
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I had the same problem on my Sanibel. I changed to Horst probes and it works great now. They were easy to change out.
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Old 07-14-2015, 07:26 PM   #10
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There's info on the forum to clean the sensors i.e. driving with full tanks to slosh around the sensors, putting cube ice in before driving. Mine are erratic but seem to settle down.
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Old 07-14-2015, 07:36 PM   #11
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We never had any trouble with our two Dutch Stars but they use external sensors. Having trouble with the Magna now (also external sensors) as the original owner didn't know or care to take care of it. When we first got it the black tank read 25% full when empty, now it takes a while to get there but I'm still getting old "stuff" out. Spent an hour last weekend doing nothing but flushing and draining the tank. Since I think we're not going to be able to go out for a while (DW's liver cancer treatments coming up) I'll get some Rid-X and let it work for a while.
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Old 07-15-2015, 08:34 PM   #12
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This method works. It might take a few dumps but it does work. My 14 year old sensors work fine,
https://sites.google.com/site/cbruni/
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Old 07-16-2015, 12:26 AM   #13
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cqr, does your system have any calibration capability?


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Old 07-16-2015, 03:07 PM   #14
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It isn't the sensors, it is crudded up tank walls that fool the sensors. Any thing that cleans the tank walls might help.

I have the TrueLevel non-contact system that Winnebago went standard with in 2005 (right after I bought mine of course so I had to add it) and right now my black tank reads full all the time. The gray started reading 2/3 full all the time few months after I installed the system.

I have pressure washed the black tank wall twice and it worked okay for a while then started reading full all the time.
In my years of trying all of the things people recommend I have not found anything that keeps the tank walls clean enough.

Summer before last the rig sat unused next to the house all summer with the gray tank valve open and a hose that drained into a stone filled hole. When we got ready to head south and ran some water, a bunch of dried crud that had been on the side of the tank ran out. Since then (including all last winter) the gray water level has been accurate.

Some people have reported that the Horst Miracle Probes work well. They shield and move the sensors out from the tank walls so the gunk doesn't fool them. However their web site is no longer active so I don't know if they are still in business. "www.horstmiracleprobes.com"
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