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Old 02-20-2022, 12:33 PM   #1
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Waste tank monitoring

Anyone out there getting good service out of a waste tank monitor? We’ve got a 35 gallon plastic tank that suffers a bit from my Admiral’s frequent flushes. Closer monitoring would save us from the occasional unsavory surprise.

We see lots of choices but wonder if any particular brand of these stick-on devices work. Thanks in advance for any help.
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Old 02-20-2022, 01:01 PM   #2
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I use tank tenders out of Gig Harbor Washington. It uses a finger operated air pump to allow measuring pressure water or fuel height and small nylon lines to bottom of each tank in the boat. Waste, fresh water and fuel are coupled to one station. A rotator allows tank selection. I check levels on a daily basis when I am using the boat.
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Old 02-20-2022, 01:48 PM   #3
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Quote:
Originally Posted by DennisB1 View Post
I use tank tenders out of Gig Harbor Washington. It uses a finger operated air pump to allow measuring pressure water or fuel height and small nylon lines to bottom of each tank in the boat. Waste, fresh water and fuel are coupled to one station. A rotator allows tank selection. I check levels on a daily basis when I am using the boat.
Just read the Webpage of Hart Systems Tank Tender. Very interesting approach in accurate gauging of tank levels. Thanks for the info.
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Old 02-20-2022, 01:49 PM   #4
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Quote:
Originally Posted by DennisB1 View Post
I use tank tenders out of Gig Harbor Washington. It uses a finger operated air pump to allow measuring pressure water or fuel height and small nylon lines to bottom of each tank in the boat. Waste, fresh water and fuel are coupled to one station. A rotator allows tank selection. I check levels on a daily basis when I am using the boat.
I use this system for water and fuel, but not waste. Have been very happy with the system.

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Old 02-20-2022, 02:27 PM   #5
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I've had one of three blue sea ultrasonic sensors in my waste tank for 2.5 years now. Every once in a while it seems to lose track of the level for a bit, bit it's generally been reliable. And no moving parts to get stuck.
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Old 02-20-2022, 02:54 PM   #6
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The SCAD tank level monitors Scad Tank Monitors are top rated, relatively inexpensive, and use sensors that mount on the outside of the tank.


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Old 02-20-2022, 04:29 PM   #7
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I second Peggie's recommendation on the SCAD tank monitor. It has worked great for me on a 40 gallon plastic tank.
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Old 02-20-2022, 05:10 PM   #8
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Gobius also manufacturers a tank monitor whose sensors mount on the exterior of tanks.

I've sold many Gobius and Scad monitors and both work equally well.
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Old 02-20-2022, 05:51 PM   #9
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I seriously considered the SCAD device but wanted something I could also see on my Axiom MFD's. I went with the Veratron NMEA 2K liquid level sensor. EASY install... Just use a hole-saw to cut the small opening, mount the device in the tank. I also added an inspection port at the same time and located the 2 close enough that I could easily inspect/clean the sensor if needed. Been in for a couple months now and seems to work perfectly!

I also added a simple float switch and visible/audible alarm in case the tank gets up to the upper ~10% from full. Float sensor/alarm were about ~$20 off amazon. Nice little back-up, just in case!!!


https://www.boemarine.com/veratron-n...-to-600mm.html

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

https://www.amazon.com/dp/B09BNC9YTB...ing=UTF8&psc=1
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Old 02-20-2022, 06:16 PM   #10
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I switched to a simple KUS waste tank level sensor and a analog gauge some time ago and have found it to be very reliable.
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Old 02-20-2022, 06:55 PM   #11
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The SCAD system uses the Tank Edge capacitative sensor which mounts on the outside of a (non-conducting) tank. The sensor can be purchased directly from Tank Edge for a very modest cost compared to some of the solutions mentioned so far, and read by several different schemes. I'm using a Victron Cherbo, information can be broadcast on N2K if you want to see it elsewhere. About 25 Tank Edge sensors can be bought for the price of the Tank Tender.
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Old 02-20-2022, 07:34 PM   #12
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My methodology is a little more technical.

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Old 02-20-2022, 08:25 PM   #13
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How effective is the SCAD system when used on a fiberglass waste tank?
Anyone with experience??
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Old 02-20-2022, 09:45 PM   #14
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How effective is the SCAD system when used on a fiberglass waste tank?
Anyone with experience??
Scad and Gobius work fine on FG tanks. As long as you follow the instructions exactly.

The sensors adhere easier on FG than polyurethane tanks.

If the FG is extremely thick, there may be issues but I've installed them on 5/16" - 3/8" thick Ronco poly tanks without issue.
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Old 02-20-2022, 10:14 PM   #15
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The new GobiusPro tank monitors are Bluetooth enabled and monitored on your phone or tablet.

Max thickness of various tank materials allowable for Gobius sensors:

Stainless steel, max 3 mm
Steel, max 3 mm
Aluminium, max 5 mm
Polyethelene, max 12 mm
Fibre Glass, max 8 mm
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Old 02-20-2022, 11:08 PM   #16
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Am I wrong in thinking you sell Gobius tank monitors?
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Old 02-20-2022, 11:30 PM   #17
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You are all overthinking this.

1. Remove top inspection plate, insert arm.

2. Tank height minus length of arm from top of tank to "contact!" = available free space.
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Old 02-21-2022, 10:41 AM   #18
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My holding tank is midship, in a fairly tight space with access to the top and not much access along the sides.

I have a Kus float valve type, but it fouls up every season so I need to pull and clean it every year because it gets stuck. I treat my tank well, use NoFlex, pump out often, and flush it.

Regarding the Scad exterior mount system on a FG tank; is everything external and no drilling required? I don't think I could get a drill in there if I wanted to, but should be able to apply the tape and sensors.

The reason I ask is the literature says “1/2 in hole” but I dont see that being needed including on a YT Vid by a do it yourselfer.
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Old 02-21-2022, 11:08 AM   #19
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Quote:
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Am I wrong in thinking you sell Gobius tank monitors?
If you read post #8 I said:

"I've sold many Gobius and Scad monitors and both work equally well."
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Old 02-21-2022, 11:25 AM   #20
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The SCAD (really Tank Edge) sensor does not require any holes and applies to any outside vertical surface of the tank.
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