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Old 07-17-2015, 02:06 PM   #1
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Blackwater sensor

Anyone care to explain the way the black tank sensors operate? Is it a float or tank wall mounted sensor? I noticed after the first week of use (and probably poor operating technique) that it seemed to read full way before I thought that it should. I've since really cleaned out the tank with using a clear extension to monitor and got lots more waste to flush out (after about 30 hot minutes of doing so) even after it initially appeared to have stop draining. The upside is that I probably lost 5 pounds in sweat by doing so. Anyway, it doesn't seem to fill up as quickly now and I wondered if I had a sensor covered/blocked. Also curious as to how the flush jets are positioned if anyone has pics or diagrams.
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Old 07-17-2015, 02:16 PM   #2
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The sensors are easily clogged with paper and other things. Most don't get to obsessed with the black water sensor, you can lose your religion trying to keep them clean.

Just keep water in the tank and don't open it to dump until it is almost full. We know when ours is getting ready to be full without the sensors.

There are better sensors available but it would make to much sense to install them on a new rig?
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Old 07-17-2015, 02:51 PM   #3
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norty1 - This may be a stupid question, but how do you know it's almost full? Looking into the tank? We try to be quick with the flushes to not allow much odor to escape.
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Old 07-17-2015, 03:03 PM   #4
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Quote:
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Anyone care to explain the way the black tank sensors operate? Is it a float or tank wall mounted sensor? I noticed after the first week of use (and probably poor operating technique) that it seemed to read full way before I thought that it should. I've since really cleaned out the tank with using a clear extension to monitor and got lots more waste to flush out (after about 30 hot minutes of doing so) even after it initially appeared to have stop draining. The upside is that I probably lost 5 pounds in sweat by doing so. Anyway, it doesn't seem to fill up as quickly now and I wondered if I had a sensor covered/blocked. Also curious as to how the flush jets are positioned if anyone has pics or diagrams.
I had to chuckle when I read your first sentence "the way the black tank sensors operate". They don't operate!

Seriously, these sensors don't work most of the time and when they act like they are working they don't necessarily work correct either. After I dump my sensors still show 1/3 full and after a few hours they read full again. So I don't even worry about them. You can tell the tank is almost full when you flush and you start to see a bubble of air coming out of the tank vs everything just falling into the opening. With mine when I start to see this bubble I have a half dozen or so flushes remaining so if it happens in the evening I'm good until the next morning.

After several cycles of this you will learn to read the bubble even when it is first starting. You will also get a good feel for how long it should be from empty to full depending on how many people are using it. For me by myself I have to dump every 2-2.5 weeks.
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Old 07-17-2015, 03:12 PM   #5
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For sure looking into the tank is the best solution for us. We were in a panic mode after three days of camping when we first got our trailer. Sensors showed full on the third day just from paper probably floating by. It appears to look high quickly because the tank is not that deep but is wide and the pipe you look into is set in below the top of the tank. Anyhow we can easily go 6 days with the two of us and i just watch to see if it is at the top of the pipe then i know its time to dump. I use a small flashlight when checking and we have a 30 gallon tank.
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Old 07-17-2015, 03:25 PM   #6
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Daham, you people are lucky!


My 19RD has an elbow under the toilet. No knowing what is downstream of that. Other than the lying-sack-of-[excrement] sensors and monitoring panel.


Arrive: empty. End of day 1: 1/2 full. No, wait that's 2/3 full. What're we gonna do for the next 3 days?!?!?!. After lunch day 2: E light steady and 1/3 light blinks as the button is pressed. 30-odd hours to get a good reading? Sheesh!


Rest of trip: Reasonable reading. After dumping 2/3 full.


Get home flush the BW tank 2X. Finally reads empty again.


Is this anyway to run a railroad?


We're going glamping again next month...
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Old 07-17-2015, 03:47 PM   #7
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I think I'll just get a yardstick and put "Empty", "Close", "Closer", and "Uh-Oh" markings on it. Stick it down in the toilet after each use and I've got an answer. Now just where to put it in between...
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Old 07-17-2015, 03:50 PM   #8
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norty1 - This may be a stupid question, but how do you know it's almost full? Looking into the tank? We try to be quick with the flushes to not allow much odor to escape.
My wife tells me. We also have a bend in the pipe so there is no looking but she can tell by the sound!.
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Old 07-17-2015, 07:31 PM   #9
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I can't speak for other models, but my 33RLDS black tank flushing spray nozzle is located on the same side of the tank as the gauge probes. (underbelly is open)You would think that Jayco would install the spray nozzle on the opposite side so it would wash off the probes, but that makes too much sense.
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Old 07-18-2015, 10:31 AM   #10
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So how much water should be in the black water tank when I start my stay? After I finish getting the site setup, I plan on adding water to the black water.

Is there an optimal amount? Am I being to anal about this?
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