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Old 01-02-2017, 08:26 AM   #1
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Tank Level Sensors

We have a 2010 36QSH and the grey tank level indicator never drops below 2/3 full. Where are the sensors located, how easy are they to get to, and is it possible to clean/lubricate or replace them. Thanks for any help!
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Old 01-02-2017, 09:39 AM   #2
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The sensors are mounted directly to the tanks. You would need to remove the passenger side wet bay access door to see them. Clean your heart out - they really will never be accurate (nature of the design and all coaches using this system will have the same problem).

You can choose to ignore them and use the time method (dump the tank, it's been three days) or invest in a better system. We had our dealer install a SeeLevel system (Garner Industries) before we even picked up the coach. You can install this yourself or have someone do it for you. However, the old sensors will never work as you think they should so replacement is your best option.
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Old 01-02-2017, 01:17 PM   #3
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Roger & Mary,
Thanks, appreciate the response!
Ken
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Old 01-02-2017, 03:52 PM   #4
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Quote:
Originally Posted by chiavet View Post
Roger & Mary,
Thanks, appreciate the response!
Ken
I agree with Roger, Tank sensors have never worked. But if you want to read what some folks have done to clean the sensors there is a thread on The Class A motor home site title Grey Water Tank where respondents talk about what they do to their tanks.
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Old 01-02-2017, 04:45 PM   #5
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Standard sensors are little more than nails, driven in through the side of the tank (Well, slighly more complex they are rods. with holes drilled and tapped in one end for the screw the wire attaches to) Sealed to the tank

That's all, There is NOTHING that can go wrong with teh sensor save for the resistor pack and it nearly never fails

The circuit is a wire from your sensor panel to the resistor pack and from there on to the FULL prob
Then wires off the resistor pack go to the different "partial" probes

The sensor simply measures the current through the resistor pack (Resistance of the pack) or voltage relative to battery voltage. Take your pick. (Same measurement in either case)

Now if the resistor pack fails.. You get an EMPTY reading..

So here is what happens.. The wall gets "Slimed' by the tank contents, thus it is always "Moist" and always conducting.. nothing wrong with the sensor. Something wrong with the concept.

Horst Miricle Probes are supposed to be more immune to this. I've yet to order a set (Got to do that some day)

See Level uses a different type of sensor

And there is still one other type of sensor that I know of... Or 2, these are all supposed to be immune.. but are, of course, more expensive.
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Old 01-02-2017, 04:49 PM   #6
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Old 01-02-2017, 09:51 PM   #7
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Quote:
Originally Posted by wa8yxm View Post
Standard sensors are little more than nails, driven in through the side of the tank (Well, slighly more complex they are rods. with holes drilled and tapped in one end for the screw the wire attaches to) Sealed to the tank

That's all, There is NOTHING that can go wrong with teh sensor save for the resistor pack and it nearly never fails

The circuit is a wire from your sensor panel to the resistor pack and from there on to the FULL prob
Then wires off the resistor pack go to the different "partial" probes

The sensor simply measures the current through the resistor pack (Resistance of the pack) or voltage relative to battery voltage. Take your pick. (Same measurement in either case)

Now if the resistor pack fails.. You get an EMPTY reading..

So here is what happens.. The wall gets "Slimed' by the tank contents, thus it is always "Moist" and always conducting.. nothing wrong with the sensor. Something wrong with the concept.

Horst Miricle Probes are supposed to be more immune to this. I've yet to order a set (Got to do that some day)

See Level uses a different type of sensor

And there is still one other type of sensor that I know of... Or 2, these are all supposed to be immune.. but are, of course, more expensive.
You are absolutely correct about the concept and you are also absolutely correct about why they don't work. 47 years of RVing in more that 15 good motor homes and have never had sensors that work properly.
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Old 01-09-2017, 08:33 AM   #8
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Why does the sender gauge read in reverse and can it be reset?
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Old 01-09-2017, 11:28 AM   #9
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Why does the sender gauge read in reverse and can it be reset?
Mikespeak944
Be nice if you posted your model and year but I'm assuming it is a late model Allegro.

Have you tried unplugging the AC power and disconnecting the 12V power and rebooting everything?

If you don't get answers here, 1) Call Tiffin Service; 2) visit tiffinrvnetwork dot com and join the group. This has come up before and the fix is pretty easy.
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