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Old 09-11-2013, 08:40 PM   #11
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Originally Posted by Tireman9 View Post
I have had problem with the OE sensors since day 1. Have flushed the tank with a wand and then filled the black tank 2 gal at a time. I found that even when clean the OE sensors did not read correctly as they would show 0 when 1/4 full then jump to 1/2 when about 3/8 then 100% full when actually 3/4.
I can see down the toilet and simply use a flashlight.
As you can see from the placement of my tank's sensors:

The "E" means there is power to the display panel and none of the sensors are touching water.

The 1/3 F light is so close to the bottom of the tank that a flush or two will turn it on. It is a "Not Empty" light.

The 2/3 F light is about in the middle so it is actually a 1/2 light.

The F light is almost to the top and is actually a 7/8 full (time to dump) light.
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Old 09-11-2013, 09:34 PM   #12
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I agree that you probably have and electric or panel issue.
But We had this happen on our black tank once on the 2013 295kbh we had. The best we could get was 2/3 on it even after dumping.
I had to rinse with a wand and backflush several times till I could see through the toilet that the tank was full, and then empty. My culprit was I emptied once without the tank being full.
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Old 09-11-2013, 09:53 PM   #13
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Remember the probes have very little to do with the level of the water in the tank; OTHER THAN the resistance the display panel detects.

RED TO ORANGE 0 OHMS
RED TO GREEN 68K OHMS
RED TO YELLOW 188K OHMS

Display to ground reads 0 ohms (shorted) = Full
Display to ground reads less than 68,000 ohms = 2/3 Full
Display to ground reads less than 188,000 ohms = 1/3 Full
Display to ground reads infinite (open) reads empty

ANY PROBE can short out (for example a hair ball touching side of slimy tank wall causing tank to read full when it is empty). Even a single hair or clump of poo can create "less than a short" causing spurious readings of 1/3 or 2/3 or full.



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Old 09-11-2013, 10:02 PM   #14
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Originally Posted by herk7769 View Post
...
ANY PROBE can short out (for example a hair ball touching side of slimy tank wall causing tank to read full when it is empty). Even a single hair or clump of poo can create "less than a short" causing spurious readings of 1/3 or 2/3 or full.
Yep, so now we all agree that it's absurd to continue putting probes inside the tank. We should all switch to capacitive sensors as soon as practical. They mount on the OUTSIDE of the tank. What a concept!
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Old 09-11-2013, 10:05 PM   #15
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Yep, so now we all agree that it's absurd to continue putting probes inside the tank. We should all switch to capacitive sensors as soon as practical. They mount on the OUTSIDE of the tank. What a concept!

If you Google the capacitance systems there are issues with them as well.
No system is without potential problems.
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Old 09-11-2013, 10:10 PM   #16
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Originally Posted by herk7769 View Post

If you Google the capacitance systems there are issues with them as well.
No system is without potential problems.
Potential problems? What could be a bigger "potential problem" than mounting your electronics inside a bucket full of s**t.

(OK, I'll stop now. Have a good night Lou, wherever you are.)
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Old 09-11-2013, 10:27 PM   #17
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I had a different solution to the lousy sensor problem. I went with the SeeLevel system. It is a system that uses new sensor boards to read the level of the tanks through the tank walls, thus eliminating any possibility of sensor fouling. Here is a link to a post I made on install here on the forum. See Level Tank Monitor system install
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Old 09-11-2013, 10:59 PM   #18
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Originally Posted by SargeW View Post
I had a different solution to the lousy sensor problem. I went with the SeeLevel system. It is a system that uses new sensor boards to read the level of the tanks through the tank walls, thus eliminating any possibility of sensor fouling. Here is a link to a post I made on install here on the forum. See Level Tank Monitor system install

I believe this is a capacitance system like Barry was posting about.

Barry, getting pounded with storms in Kansas tonight; sleeping with the Midland weather radio in my ear.
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Old 09-11-2013, 11:31 PM   #19
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Herks in Ks?

So are you in Ks. Herk? Where can I meet you for a autograph?
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Old 09-12-2013, 08:19 AM   #20
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So are you in Ks. Herk? Where can I meet you for a autograph?
jdadoug
Pulling out of Salina in an hour, so the Rally next August will be the next opportunity.
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