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Black Tank Sensor

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Blackcloud

Newbie
Joined
Jan 24, 2022
Messages
2
I also had the screen lock up on me. After I finally got a read on the screen it looked like it was going to work. 5% then 10% then topped out at 20%. It should have been reading 50-60%. Can’t trust it when dry camping. When my read only zero, per a service tech in Atlanta, I disconnected coach power for a few seconds. It came back up to a read but never in proper calculations.
 

NWIP

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Joined
Nov 4, 2019
Messages
1,434
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No Where In Particular
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2020
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Newmar
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Dutch Star 4369
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43’ 9”
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Spartan K2
Engine
Cummins ISL9
TOW/TOAD
2016 Colorado
Fulltimer
Yes
Have you tried this procedure to recalibrate. You need to have a flow meter to know how much water you put into the back tank prior to setting full level
 

Attachments

  • Tank calibration.pdf
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redbaron

Staff member
RVF Moderator
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2020 Jeep Wrangler Unlimited Rubicon
@Blackcloud I think the first recalibration you did messed up. The original problem was a typical kib freeze on communication. The power reset is the correct action.

Once you have done a reset, then do the full recalibration again. That should fix it.

Fwiw, the pressure sensor seems to be working, or dead. The dead ones are usually revived with power reset.

The working ones, once calibrated, are very accurate.
 

DavidL

At Cruise Speed
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Metamora, MI
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MountainAire
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Cummins 500hp
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Grand Cherokee
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No
The problem with ARD's picture is the pressure sensor is not oriented correctly. It needs to be level with the bottom of the tank. It is measuring the water column pressure. Pointed the way it is, it won't measure the last 20% of the tank and all measurements would need to be calibrated less the 20%. The problem with water pressure sensors is the port / sensor getting plugged and not sensing pressure anymore. Rotate it 90 more degrees and recalibrate.

A better design would be a fitting to allow air to be pushed to clear the "crap" in the port...but without ruining the sensor that has to be pretty sensitive. 2.31 feet of water / per PSI. So looks like their sensor is rated up to 3psi so can support a tank that is 7 ft tall. I think that'll do it....
Nothing new with this design...but new apparently to RVs.
 

redbaron

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The sensor is in the pipe attached to the bottom of the tank. The pipe will fill first before the tank holds water, since gravity dictates water will always flow downwards.

The orientation of the sensor does not matter, as that pipe will be the first to fill.

As the tank above collects more volume, this sensor will detect it.

I have personally experienced this sensor design in both black and gray, and can report that it is very accurate all the way from 0 to 100.
 

Dona40

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Agree with Redbaron. That's what "calibration" is for.
 

Dona40

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As long as the sensor is at or below the bottom of the tank, you would need real high-tech equipment to tell the difference, and do we have to worry about 1 pint or so at the beginning of the fill?
 

DavidL

At Cruise Speed
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No
No "high tech" equipment required. In reality, just a voltmeter and a conversion chart...
The pressure sensor needs to be fairly sensitive as the pressures are pretty low.

Another type is a pressure sensor that is on a wire and is submerged...I use these for Wakeboard boat ballast tank level sensing (lake water, no solids). Industry uses these for sludge tank monitoring.

But the issue of blockage remains. If the pressure sensor was on a T and the other side of the T went Up and over the top of the tank vented to air, then you could push air down that tube to clean...but the pressure sensor has to be rated to not get damaged with the increase in pressure. And the sensor needs to be at the bottom (or lower) of the tank to near fully show 0 - 10% full.
 

FrankE

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No
Can I just say Hallelujah! Newmar is done with KIB. As many of you know, I, as many others, have had issues with my black tank sensors reading properly from year 1. I've had new sensors, water pump relocated, new board, software updates, tons of recalibrations to no avail. This past visit to Newmar has taken care of my problem. Newmar unplugged the KIB pad on the tank and installed a a sensor by the gate valve that works by pressure (gravity). The higher the water level, the more pressure you have. It is working so far. No red lights, no showing 100% full when empty. It's the little things! Oh and the floater is still in the tank, so IF you do get a full tank reading when you think it's not full, you can pull the famous yellow wire and if it is still red, you know you are full. ?
thank you for posting this cause we have the red light and can’t flush either toilets. Hopefully we can get this red light turned off so we can flush and then have your fix done. Thank you again
 

Buly

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Messages
992
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RV Length
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2014 Honda CRV
There is a way to measure the increasing pressure in the tank, without the sensor being in contact with the sludge. ( I want royalties for that 😂).
Imagine a tube with the sensor at one end and open at the other. Submerge it with the open end down. The increasing fluid level in the tank will create increasing pressure in the air pocket, without reaching the sensor. All you have to do is calibrate it
 

ARD

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thank you for posting this cause we have the red light and can’t flush either toilets. Hopefully we can get this red light turned off so we can flush and then have your fix done. Thank you again
If you are connected to city water and you know your tank is empty, you can pull the fuse in the half bath for "monitor and water pump" and you will be able to flush. Good luck.
 

Robert07

Just Idling Around
Joined
Aug 30, 2021
Messages
41
Cleaning the RV holder tank sensor will help you regain control of your exciting RVing adventure, freeing up foul-smelling tanks and ensuring the sensor is working properly. Open the RV toilet by pushing the flush lever and inserting the wand straight into the holder. Start cleaning the bottom of the tank, working your way up. Pay attention to the sidewalls of the tank. It helps if you move the wand in a circular motion to ensure a more thorough cleaning.
 

NWIP

RVF Supporter
Joined
Nov 4, 2019
Messages
1,434
Location
No Where In Particular
RV Year
2020
RV Make
Newmar
RV Model
Dutch Star 4369
RV Length
43’ 9”
Chassis
Spartan K2
Engine
Cummins ISL9
TOW/TOAD
2016 Colorado
Fulltimer
Yes
Cleaning the RV holder tank sensor will help you regain control of your exciting RVing adventure, freeing up foul-smelling tanks and ensuring the sensor is working properly. Open the RV toilet by pushing the flush lever and inserting the wand straight into the holder. Start cleaning the bottom of the tank, working your way up. Pay attention to the sidewalls of the tank. It helps if you move the wand in a circular motion to ensure a more thorough cleaning.
This will work on coaches with gravity toilets, however most Newmar coaches the toilets are not located over the black tank.
 

AbdRahim

RVF Supporter
Joined
Dec 25, 2019
Messages
2,155
RV Year
2020
RV Make
Newmar
RV Model
BayStar 3626
RV Length
37’
Chassis
Ford
Engine
V10
TOW/TOAD
None
I probably should not join this discussion, as I have different sensors. However, I got the black tank working fine. The gray tank always reads 1/3 when empty. I have cleaned it with tons of Blur power, a cup of Dawn and drive several hundred miles three times. No change. I put 30 oz of Dawn and 5 gallons of water in this time and will use lots of water on the way to the service center and see what happens. Hopefully I won't suds over. :unsure:

The sensor is on the outside of the tank. The only thing I could think of on the inside of the tank at this point is hard water deposits. They have lined the tube going from the toilet into the black tank. Scraping that out is not easy. Suggestions welcome.
 

Dona40

RVF Groupie
Joined
Feb 22, 2021
Messages
246
Location
Oregon
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2016
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Thor
RV Model
Tuscany 40DX
RV Length
41
Chassis
Freightliner XC
Engine
Cummins 8.9
TOW/TOAD
Jeep Grand Cherokee
Fulltimer
Yes
This will work on coaches with gravity toilets, however most Newmar coaches the toilets are not located over the black tank.

I probably should not join this discussion, as I have different sensors. However, I got the black tank working fine. The gray tank always reads 1/3 when empty. I have cleaned it with tons of Blur power, a cup of Dawn and drive several hundred miles three times. No change. I put 30 oz of Dawn and 5 gallons of water in this time and will use lots of water on the way to the service center and see what happens. Hopefully I won't suds over. :unsure:

The sensor is on the outside of the tank. The only thing I could think of on the inside of the tank at this point is hard water deposits. They have lined the tube going from the toilet into the black tank. Scraping that out is not easy. Suggestions welcome.
There is a mineral called Struvite that builds up on the inside of the tank. There is a company that makes a dissolving compound (mostly for sewer pipes) that is supposed to take care of it. It is pretty expensive so I opted to build a high pressure wand to feed up the dump valves. Seemed to make a big difference. Flakes of whitish stuff came out. I think there's even a guy that goes around and does this procedure for a business.
 

Robert07

Just Idling Around
Joined
Aug 30, 2021
Messages
41
Cleaning the RV holder tank sensor will help you regain control of your exciting RVing adventure, freeing up foul-smelling tanks and ensuring the sensor is working properly. Open the RV toilet by pushing the flush lever and inserting the wand straight into the holder. Start cleaning the bottom of the tank, working your way up. Pay attention to the sidewalls of the tank. It helps if you move the wand in a circular motion to ensure a more thorough cleaning.
Learning how to clean RV holding tank sensors will help you regain control of your delightful RVing adventures, freeing you of foul-smelling tanks and ensuring well-functioning sensors.
 

AbdRahim

RVF Supporter
Joined
Dec 25, 2019
Messages
2,155
RV Year
2020
RV Make
Newmar
RV Model
BayStar 3626
RV Length
37’
Chassis
Ford
Engine
V10
TOW/TOAD
None
Learning how to clean RV holding tank sensors will help you regain control of your delightful RVing adventures, freeing you of foul-smelling tanks and ensuring well-functioning sensors.
On the third or fourth cleaning, each time with more dish detergent (Dawn) on this run, six hundred miles over four days with 30 ounces of dawn in the gray tank. We will see.
 

Texas Clodhopper

RVF Supporter
Joined
Nov 16, 2019
Messages
279
Location
Spicewood, TX
RV Year
2017
RV Make
Newmar
RV Model
Ventana 4369
RV Length
43
Chassis
Freightliner
Engine
Cummins
TOW/TOAD
2018 GMC Canyon
On the third or fourth cleaning, each time with more dish detergent (Dawn) on this run, six hundred miles over four days with 30 ounces of dawn in the gray tank. We will see.
I'm in the same state...it always shows 1/3. I should have bought P&G stock for all the Dawn I've used. I've tried Cascade Dishwasher Soap also.
\
 

AbdRahim

RVF Supporter
Joined
Dec 25, 2019
Messages
2,155
RV Year
2020
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Newmar
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BayStar 3626
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Ford
Engine
V10
TOW/TOAD
None
Well, Newmar saysput 8 oz of AquaKem in a tank of clear water and leave it for seven days. Since I am in it most of the time, it took two tries. I put in the AquaMax and used the tank as normal for three days, then dumped. 2/3 cleared, but not 1/3. Tried again and left in for 6 1/2 days. Oh, and I drove 300 miles withit in the tank before dumping. The 98* day probably helped also.
Voila, it registered empty after dumping for the first time in months. The tech at Newmar said they have done studies and it seems to take four days to start working.
 
Last edited:

Texas Clodhopper

RVF Supporter
Joined
Nov 16, 2019
Messages
279
Location
Spicewood, TX
RV Year
2017
RV Make
Newmar
RV Model
Ventana 4369
RV Length
43
Chassis
Freightliner
Engine
Cummins
TOW/TOAD
2018 GMC Canyon
Well, Newmar saysput 8 oz of AquaKem in a tank of clear water and leave it for seven days. Since I am in it most of the time, it took two tries. I put in the AquaMax and used the tank as normal for three days, then dumped. 2/3 cleared, but not 1/3. Tried again and left in for 6 1/2 days. Voila, itregistered empty after dumping for the first time in months. Thetech atNewmar said they have done studies and it seems to take four days to start working.

Thanks, I ordered a 6 pack.
 

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