Black Tank Sensor

[Dona40]

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

 

[Dona40]

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]

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]

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]

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]

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.

 

[NWIP]

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]

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.

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]

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.

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.

 

[AbdRahim]

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]

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]

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.

 

[Texas Clodhopper]

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.

 

[Neal]

I'm curious how many that have been told and tried AquaKem have found it to resolve their problem? Typically it's a Newmar problem with KiB but @Texas Clodhopper you don't have that so let us know how it works for you. I recommend putting in a SeeLevel system if they still sell the Bluetooth version. Let me check...yep, it is. This is what I use:

Garnet 709-BTP3 SeeLevel II Tank Monitoring System with Bluetooth

With the Garnet 709-BTP3 Seelevel II Tank Monitor you will have tank readings on your fresh, grey, black & LP tanks along with battery voltage and a water pump switch.

www.rvupgradestore.com

 

[Texas Clodhopper]

I'm going to start with the cheaper attempt of course I've used enough Dawn, Cascade, Calgon, etc I feel like I could have spent the $300+ on the SeeLevel be money ahead.

I'll give the AquaMax a try and as a word of caution, AquaKem contains formaldehyde which is harmful to septic systems and that is what many rv parks have. AquaMax is formaldehyde is free.