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05-20-2019, 02:27 PM
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#1
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Rivet Master
1992 29' Excella
Virginia Beach
, Virginia
Join Date: Jul 2012
Posts: 747
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Best LPG Monitor System
I have two (2) 30lb. Aluminum tanks. Is there a good monitoring system I can use? Up to this point I just keep an eye on them, but I'd like something better that I can read from my truck or the AS cabin.
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Pete
Virginia Beach, VA
1992 29' Excella Classic
TV 2006 Dodge Ram 2500
Mega Cab Diesel 4x4
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05-20-2019, 03:13 PM
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#2
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Registered User
2016 28' International
Birmingham
, Alabama
Join Date: Feb 2013
Posts: 119
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05-20-2019, 03:15 PM
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#3
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Rivet Master
2007 22' International CCD
Corona
, California
Join Date: Jul 2013
Posts: 9,180
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Best LPG Monitor System
Yup. That works, as many have reported. The tank tire ring also positions the tank properly and help reduce rust or corrosion on the tank bottom ring. Readout can also be on your phone or a stand-alone display inside the trailer.
Some of my tanks also have built in mechanical gauges, but you have to open the cover to see them. DW won’t like me putting windows in the tank comer....
__________________
Rich, KE4GNK/AE, Overkill Engineering Dept.
'The Silver HamShack' ('07 International 22FB CCD 75th Anniversary)
Multiple Yaesu Ham Radios inside and many antennae sprouting from roof, ProPride hitch, Prodigy P2 controller.
2012 shortbed CrewMax 4x4 Toyota Tacoma TV with more antennae on it.
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05-20-2019, 04:53 PM
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#4
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Site Team
2009 25' FB International
2018 27' Globetrotter
Hanover
, Pennsylvania
Join Date: Mar 2014
Posts: 3,727
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The OP has aluminum tanks which prevents the use of the magnetic sensors. I don't know of any units that will work with aluminum tanks.
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05-20-2019, 04:55 PM
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#5
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Rivet Master
2007 22' International CCD
Corona
, California
Join Date: Jul 2013
Posts: 9,180
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Best LPG Monitor System
The magnets just stick them to a steel tank. There is also a set of rubber pads in the kit to hold the sensor against the bottom of an aluminum or fiberglass tank as well.
The sensor uses sound pulses to detect propane level.
__________________
Rich, KE4GNK/AE, Overkill Engineering Dept.
'The Silver HamShack' ('07 International 22FB CCD 75th Anniversary)
Multiple Yaesu Ham Radios inside and many antennae sprouting from roof, ProPride hitch, Prodigy P2 controller.
2012 shortbed CrewMax 4x4 Toyota Tacoma TV with more antennae on it.
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05-20-2019, 05:11 PM
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#6
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Site Team
2009 25' FB International
2018 27' Globetrotter
Hanover
, Pennsylvania
Join Date: Mar 2014
Posts: 3,727
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Quote:
Originally Posted by rmkrum
The magnets just stick them to a steel tank. There is also a set of rubber pads in the kit to hold the sensor against the bottom of an aluminum or fiberglass tank as well.
The sensor uses sound pulses to detect propane level.
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Ah, I wasn't aware that provisions have been made to use the sensors with aluminum or fiberglass. Thanks for the info.
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05-20-2019, 08:55 PM
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#7
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Rivet Master
2007 22' International CCD
Corona
, California
Join Date: Jul 2013
Posts: 9,180
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As far as I know the tank type does not matter much. Check the manual and the manufacturer website to double check. My tanks are steel...
__________________
Rich, KE4GNK/AE, Overkill Engineering Dept.
'The Silver HamShack' ('07 International 22FB CCD 75th Anniversary)
Multiple Yaesu Ham Radios inside and many antennae sprouting from roof, ProPride hitch, Prodigy P2 controller.
2012 shortbed CrewMax 4x4 Toyota Tacoma TV with more antennae on it.
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05-20-2019, 09:00 PM
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#8
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Rivet Master
1992 29' Excella
Virginia Beach
, Virginia
Join Date: Jul 2012
Posts: 747
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Quote:
Originally Posted by rmkrum
The magnets just stick them to a steel tank. There is also a set of rubber pads in the kit to hold the sensor against the bottom of an aluminum or fiberglass tank as well.
The sensor uses sound pulses to detect propane level.
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That's really good to know. I was have not seen that information before. As you mentioned in your last post, I'll check the manual and the website. Thanks
__________________
Pete
Virginia Beach, VA
1992 29' Excella Classic
TV 2006 Dodge Ram 2500
Mega Cab Diesel 4x4
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05-20-2019, 09:03 PM
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#9
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Rivet Master
1992 29' Excella
Virginia Beach
, Virginia
Join Date: Jul 2012
Posts: 747
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My thanks to everyone who replied.
__________________
Pete
Virginia Beach, VA
1992 29' Excella Classic
TV 2006 Dodge Ram 2500
Mega Cab Diesel 4x4
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05-20-2019, 09:30 PM
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#10
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Rivet Master
2007 22' International CCD
Corona
, California
Join Date: Jul 2013
Posts: 9,180
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Was just looking at website. Can’t find a definitive answer on aluminum tank usage. Might be a good idea to call them. Theoretically they should work if the rubber covered sensor is in firm contact with a metal tank bottom.
__________________
Rich, KE4GNK/AE, Overkill Engineering Dept.
'The Silver HamShack' ('07 International 22FB CCD 75th Anniversary)
Multiple Yaesu Ham Radios inside and many antennae sprouting from roof, ProPride hitch, Prodigy P2 controller.
2012 shortbed CrewMax 4x4 Toyota Tacoma TV with more antennae on it.
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05-21-2019, 09:36 AM
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#11
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PSU1981
2015 27' Flying Cloud
Conroe
, Texas
Join Date: May 2015
Posts: 284
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PSU1981
Join Date: May 2015
Posts: 222
So I performed a little test last weekend to see how accurate the Mopeka system is using a scale to measure the weight of each tank.
Empty Steel 30 lb Tank = 24 lbs
Full Tank = 54 lbs
Tank 1 37.8 lbs = 46% Mopeka reading = 55%
Tank 2 40.2 lbs = 54% Mopeka reading = 48%
So accuracy was +/- 6 to 9 %
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05-21-2019, 09:39 AM
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#12
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PSU1981
2015 27' Flying Cloud
Conroe
, Texas
Join Date: May 2015
Posts: 284
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I decided to go with an old system - open 1 at a time & when it’s empty - switch to other tank & fill the 1st - this way you always have at least 1 full tank...
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05-21-2019, 11:07 AM
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#13
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retired USA/USAF
2001 30' Excella
Somerset
, New Jersey
Join Date: Jan 2009
Posts: 2,418
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I have aluminum 40# tanks. No sensor attachments so when I suspect I'm getting low I simply remove the cover and lift and shake them. Works for me and margin of error is pretty low.
Originally it came with 30# aluminum tanks each with a dial gauge and a lug to attach the wire.
__________________
Roger in NJ
" Democracy is the worst form of government. Except for all the rest"
Winston Churchill 1948
TAC - NJ 18
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05-21-2019, 11:25 AM
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#14
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2 Rivet Member
2006 28' International CCD
Saint Paul
, Minnesota
Join Date: May 2013
Posts: 51
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Pitch as in music. When propane tank is full, knock on it with your knuckle. It makes a sound, F# maybe (App tuner on iPhone, "Total Energy Tuner" for instance, will tell you). Tap when tank is empty, different pitch, E perhaps. Different tanks different pitches. You'll soon know yours. Perfect pitch helps (I don't have it) but the tuner app works perfectly. Most of us have two tanks. One empty, one full produces a minor third. Go from there. It works and with the app it's foolproof.
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05-21-2019, 11:26 AM
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#15
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Rivet Master
2017 26' Flying Cloud
Tampa
, Florida
Join Date: Feb 2017
Posts: 7,657
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Pour a cup of hot water down the side of the tank.
There will be a line where the liquid propane feels colder to the touch.
Or, if you need higher tech:
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05-21-2019, 05:04 PM
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#16
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Rivet Master
1992 29' Excella
Virginia Beach
, Virginia
Join Date: Jul 2012
Posts: 747
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Quote:
Originally Posted by rmkrum
Was just looking at website. Can’t find a definitive answer on aluminum tank usage. Might be a good idea to call them. Theoretically they should work if the rubber covered sensor is in firm contact with a metal tank bottom.
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I went to the Mopeka website and another for an Amazon distributor. I sent an email to Mopeka and left phone messages for both Mopeka and AP (amazon distr.).
I could not find any information that was encouraging with regard to using with non steel tanks.
Here's a post from Amazon Q&A:
Quote:
Q: Will this work on and aluminum tank, if attached with something other than a magnet, and will it work with any liquid, rather than just propane?
A: I WAS a fan now not so much. It's important the sensor makes contact with the tank. The sensor is directly on the bottom with a good magnet on each side, that won't help you with an aluminum tank, plus condensation and the fact that they actually stick out slightly from the bottom of a steel propane tank (you'll notice some single units are pictured with little green pieces of plastic, this set will probably come with them. You'll place 3 of them on the bottom of the tank to add some height to it so you don't smash the be-jesus out of your precious sensor, you'll also pray & promise to buy the metal spacers when you can afford them or a do it yourself hack & assure the gods you will always make sure all spacers are in place before setting it on any uneven surface & never on gravel or dog poo. (HUH, I wonder why they don't picture the spacers?)) So that being said, I sealed the bottoms (which is really the top b/c it goes against the bottom of the tank upside down) with a thin coat of epoxy. They worked well at first then moisture set in. I sanded down the epoxy, cleaned inside with a good contact cleaner, charged the batteries, coated with synthetic grease. It was at this point I didn't notice one of the spacers fell off & smashed one of the sensors on a bolt head in my propane tank rack. I have one sensor left.
In short, you could epoxy the plastic sides of it (plastic to metal around the unit with the sensor touching the metal bottom) to the bottom of the tank. That may work. I don't know about other liquids. I WAS a fan now not so much. see less
By The most awesome Captain Aweso… on February 6, 2019
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Seems like a pretty good product for those with steel tanks.
__________________
Pete
Virginia Beach, VA
1992 29' Excella Classic
TV 2006 Dodge Ram 2500
Mega Cab Diesel 4x4
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05-21-2019, 05:19 PM
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#17
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Rivet Master
2017 26' Flying Cloud
Tampa
, Florida
Join Date: Feb 2017
Posts: 7,657
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Quote:
Originally Posted by Re-Pete
Seems like a pretty good product for those with steel tanks.
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Yeah, it attached with a magnet. I'll assume it sends some sonic wave through the liquid and measures the time it takes for the blip to return.
The question is, could it be glued/taped to the bottom?
Or perhaps aluminum doesn't have the conductivity that makes the sensor accurate?
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05-21-2019, 05:57 PM
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#18
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Rivet Master
Kensington
, Maryland
Join Date: Jan 2016
Posts: 554
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Quote:
Originally Posted by Mhphhoward
Pitch as in music. When propane tank is full, knock on it with your knuckle. It makes a sound, F# maybe (App tuner on iPhone, "Total Energy Tuner" for instance, will tell you). Tap when tank is empty, different pitch, E perhaps. Different tanks different pitches. You'll soon know yours. Perfect pitch helps (I don't have it) but the tuner app works perfectly. Most of us have two tanks. One empty, one full produces a minor third. Go from there. It works and with the app it's foolproof.
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So I'm not the only one who went to Interlochen Music Camp No, really I did.
That's what I do, rap the sides with my knuckles and listen. Saddly, it works.
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05-26-2019, 10:38 AM
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#19
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New Member
2017 23' Flying Cloud
Coral Gables
, Florida
Join Date: Jun 2017
Posts: 2
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Propane monitoring
We have been full time for almost 2 years and find that using 1-tank until empty and switching tanks and getting empty filled works well, we were not using the furnace to often and primarily electric sites with 10 day boondocking occasionaly. So when the propane supply shut off we would close valve and open other valve, replacing empty tank that week or so and repeating the process as needed.
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05-26-2019, 11:32 AM
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#20
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Rivet Master
2017 26' Flying Cloud
Tampa
, Florida
Join Date: Feb 2017
Posts: 7,657
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BTW, I tried the water method and it was surprisingly easy and accurate.
I filled a 4 cup measuring cup with hot water, not boiling, straight from the tap. I then walked outside and slowly poured it down the side of the tank.
I started at the top and slid my hand down, and Bingo! The line was so dramatic I was shocked. Try It!
Question to you experts. I have the usual regulator, and I've always left both tanks open. I figured it will select one and when empty, switch to the other.
BUT....when I had the tank off for the water test, I closed both valves, even though I just removed one tank. When I restored the tank, the regulator showed red, even though I never removed the other tank. I cracked the valve, it popped green, and I shut the valve again, stayed green.
I went in and ran all three stove burners for a test, fine.
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