Cruisers Forum
 


Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 24-05-2022, 04:11   #1
Registered User

Join Date: Aug 2017
Posts: 208
Black water sensor - any recommendations / best practise?

I'm looking for the best recommendation/experience on a black water sensor.
Reliable measurement over a long period of time and easy replacement if the sensor fails should be possible.
If possible, it should be possible to measure “from above”. Each additional hole in the lower tank area is another potential source of error and unpleasant when replacing the sensor.
The type of measurement result is basically irrelevant (voltage, current, resistance, switching stages, N2k, SAE1939, CANopen...). But a continuous measurement (0...100%) is advantageous.

I've searched the forum but couldn't find a post with a relevant title.

Recommendations or links to specific products are most welcome.

Cheers
Dirk
Dirk01 is online now   Reply With Quote
Old 24-05-2022, 04:17   #2
Registered User

Join Date: Jan 2022
Posts: 64
Re: Black water sensor - any recommendations / best practise?

https://www.amazon.com/Moeller-03576...3390998&sr=8-1

Here you are. Should do it.
Sailorman97 is offline   Reply With Quote
Old 24-05-2022, 04:19   #3
Nearly an old salt
 
goboatingnow's Avatar

Join Date: Jun 2009
Location: Lefkas Marina ,Greece
Boat: Bavaria 36
Posts: 19,862
Images: 3
Re: Black water sensor - any recommendations / best practise?

The common ones are a simple float magnet and a set of reed switches in a watertight tube , usually surrounded by a slotted “debris “ shroud. In mine I fitted a small nipple to allow water to be flushed down the inside of the shroud , as the problem I found is the material gums the float up . The wash down cured that.

Other then that these sensors are very simple and reliable and fitted from the top.
__________________
Interested in smart boat technology, networking and all things tech
goboatingnow is online now   Reply With Quote
Old 24-05-2022, 04:30   #4
Senior Cruiser
 
GordMay's Avatar

Cruisers Forum Supporter

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 47,078
Images: 241
Re: Black water sensor - any recommendations / best practise?

Just a few of our relevant discussions:

“Tank liquid level senders” ➥ https://www.cruisersforum.com/forums...ml#post3050637

“Stick-on Holding Tank Level Sensor” ➥ https://www.cruisersforum.com/forums...ml#post2036839

“Ultra sound water tank sensor” ➥ https://www.cruisersforum.com/forums...ml#post1127379

“Black water tank level indicator” ➥ https://www.cruisersforum.com/forums...ml#post1981576

“Black Water Tank Level Indication” ➥ https://www.cruisersforum.com/forums...ml#post1051038
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is offline   Reply With Quote
Old 24-05-2022, 04:39   #5
Registered User

Join Date: Aug 2017
Posts: 208
Re: Black water sensor - any recommendations / best practise?

Sensors with a moving part tend to clogg. Like goboatingnow describes it needs to be serviced more or less regularly. That's what I like to avoid.
Addition: The power consuption is not of a concern. I'll have a remote controlled switch which will be activated after a flush into the BW tank (deverting valve will have a switch also). The actual value is stored with a time stamp and can be checked on a display. Reaching a certain level gives a warning (70%) and an alarm (90%).

Cheers
Dirk
Dirk01 is online now   Reply With Quote
Old 24-05-2022, 04:43   #6
Registered User

Join Date: Aug 2017
Posts: 208
Re: Black water sensor - any recommendations / best practise?

Quote:
Originally Posted by GordMay View Post
Just a few of our relevant discussions:

“Tank liquid level senders” ➥ https://www.cruisersforum.com/forums...ml#post3050637

“Stick-on Holding Tank Level Sensor” ➥ https://www.cruisersforum.com/forums...ml#post2036839

“Ultra sound water tank sensor” ➥ https://www.cruisersforum.com/forums...ml#post1127379

“Black water tank level indicator” ➥ https://www.cruisersforum.com/forums...ml#post1981576

“Black Water Tank Level Indication” ➥ https://www.cruisersforum.com/forums...ml#post1051038
Many thx to you GordMay.
I've A LOT to learn to find that discussions.
Hopefully there's an appropriate answer.

Ashes on my head.

Cheers
Dirk
Dirk01 is online now   Reply With Quote
Old 24-05-2022, 06:25   #7
Registered User

Join Date: Nov 2015
Location: Naples FL
Boat: Cheer Men PT41
Posts: 90
Re: Black water sensor - any recommendations / best practise?

Gobius Pro - sends an ultrasonic pulse through the tank at intervals you determine. Wifi and an easy install
mickand is offline   Reply With Quote
Old 24-05-2022, 06:27   #8
Registered User

Join Date: Sep 2020
Location: Seabrook, TX
Boat: Catalina 30
Posts: 265
Re: Black water sensor - any recommendations / best practise?

Saw this installed on a Ronco plastic holding tank:

https://www.emarineinc.com/SCAD-TM1-TM2-Tank-Monitor

No holes in tank. Everything is external.

Not sure how well it works, but there is a lot of crap (pun intended) in the holding tank that can foul a floating or pressure-operated tank monitoring sensor.

cheers
sinnerman is offline   Reply With Quote
Old 24-05-2022, 06:51   #9
Registered User

Join Date: Nov 2011
Location: Naples, Florida
Boat: Seapiper 35
Posts: 92
Re: Black water sensor - any recommendations / best practise?

Quote:
Originally Posted by goboatingnow View Post
The common ones are a simple float magnet and a set of reed switches in a watertight tube , usually surrounded by a slotted “debris “ shroud. In mine I fitted a small nipple to allow water to be flushed down the inside of the shroud , as the problem I found is the material gums the float up . The wash down cured that.

Other then that these sensors are very simple and reliable and fitted from the top.
Could you explain in greater detail what you did to solve the fouling problem which can be expected with such an arrangement as a donut sliding up and down a tube in a very hostile environment?
hgd137 is offline   Reply With Quote
Old 24-05-2022, 07:24   #10
Registered User

Join Date: Jan 2020
Location: Sweden
Boat: Swan 57
Posts: 181
Re: Black water sensor - any recommendations / best practise?

I'm using Maretron TLM100 which is an ultra sonic device with a special "stand tube" for black water. I use the same in all other tanks, eight in all. It works flawlessly and you can calibrate each tank sensor, taking account of the curvature of the tanks, to show the actual content i Gallons or Liters. View the whole thing through the N2K-viewer which has endless options.
Hermia II is offline   Reply With Quote
Old 24-05-2022, 07:34   #11
Nearly an old salt
 
goboatingnow's Avatar

Join Date: Jun 2009
Location: Lefkas Marina ,Greece
Boat: Bavaria 36
Posts: 19,862
Images: 3
Re: Black water sensor - any recommendations / best practise?

Quote:
Originally Posted by hgd137 View Post
Could you explain in greater detail what you did to solve the fouling problem which can be expected with such an arrangement as a donut sliding up and down a tube in a very hostile environment?


I drilled the top plate and fitted a nipple with a small shut off , the output of this is inside the shroud

My experience is that over time solid material jammed the movement of the float magnet because the shroud is supposed to ensure the float is exposed to primarily liquid. However some solids get in and especially if you tend to have a empty tank most of the time the float jams.

Water can be introduced through the washing nipple and this helps clean the inside of the shroud

This is the typical float based black water sender

Click image for larger version

Name:	IMG_1653402849.713323.jpg
Views:	17
Size:	129.3 KB
ID:	258296
__________________
Interested in smart boat technology, networking and all things tech
goboatingnow is online now   Reply With Quote
Old 24-05-2022, 10:10   #12
Registered User
 
Lancerbye's Avatar

Join Date: Mar 2007
Location: Cormorant Island, BC, Canada
Boat: Lancer 44 Motorsailer
Posts: 1,874
Images: 38
Re: Black water sensor - any recommendations / best practise?

I use Tank Tender which has four ports, no electric components, I measure Diesel, 2 tanks, fresh water, and waste water. This has been on this boat for 40 years, no problems. Simplicity is best.
__________________
The basis of accomplishment is in never quitting
Mengzi Meng-tse
Lancerbye is offline   Reply With Quote
Old 24-05-2022, 10:35   #13
Registered User
 
Russ's Avatar

Join Date: Jul 2008
Location: Satellite Beach, FL
Boat: Brewer 44' Steel
Posts: 357
Re: Black water sensor - any recommendations / best practise?

Yup a big ditto for Tank Tender. Occam’s Razor
__________________
Russ
Russ is offline   Reply With Quote
Old 24-05-2022, 11:09   #14
Registered User

Join Date: Aug 2017
Location: Rochester, NY
Boat: Beneteau 41.1
Posts: 265
Re: Black water sensor - any recommendations / best practise?

Gobius Pro is a great solution, requiring no holes or complex installation, other than providing a trickle of 12V power (I even used a small dedicated LiOn battery to avoid any wiring… one charge lasts all season).

If you’re interested, send me a PM as I have two for sale: one used a few seasons and one new, never removed from the box. I also have extra 3M custom adhesive pads for attaching the used sensor to the tank.
__________________
USCG master
Certified sailing instructor
Howler is offline   Reply With Quote
Old 24-05-2022, 11:20   #15
Registered User
 
blubaju's Avatar

Join Date: Mar 2008
Location: where my little boat is ;-) now Philippines
Boat: Catamaran Schionning Wilderness 1320, built myself
Posts: 463
Re: Black water sensor - any recommendations / best practise?

Quote:
Originally Posted by Lancerbye View Post
I use Tank Tender which has four ports, no electric components, I measure Diesel, 2 tanks, fresh water, and waste water. This has been on this boat for 40 years, no problems. Simplicity is best.
Same here, since 1990, no problems, well, a red led for night viewing could be an improvement
blubaju is offline   Reply With Quote
Reply

Tags
men, sensor, water

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Using a flow sensor instead of a tank level sensor for water vpbarkley Plumbing Systems and Fixtures 4 04-07-2021 17:25
Looking at doing a DIY capacitive black water tank sensor GILow Marine Electronics 28 28-07-2020 15:53
Fresh Water, Gray Water and Black Water Holding Tanks vweber Plumbing Systems and Fixtures 10 13-07-2018 20:25

Advertise Here


All times are GMT -7. The time now is 10:49.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2022, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2022, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.