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Old 06-05-2014, 11:04 AM   #11
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KDH, I do the same as you- I take my tanks to the local hardware store for filling vs. paying the campground.

I just have crappy luck for timing.
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Old 06-05-2014, 01:39 PM   #12
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When weighing, the TARE WT of the cylinder is stamped on the side.

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Old 06-05-2014, 01:49 PM   #13
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WOW, You are using a full tank a day. It seems like maybe you have a leak or are you running a LP generator?? A tank will last me almost two trips running the heater and the refer while driving.
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Old 06-05-2014, 01:51 PM   #14
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Maybe I'm doing things the wrong way... But why not use one tank... And when it runs out, you switch over and replace the empty?
You are doing things the (Correct) way! Your way there is (Always) a backup! The tanks are stamped on what they weigh,just add the weight of propane and there is No guessing! Youroo!!
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Old 06-05-2014, 01:51 PM   #15
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Maybe I'm doing things the wrong way... But why not use one tank... And when it runs out, you switch over and replace the empty?
That's how I do it.
Never get a bad surprise this way!
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Old 06-05-2014, 08:10 PM   #16
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these gauges measure pressure.
The pressure in the propane line is basically constant, as long as there is liquid in the tank, the pressure will be what is known as the vapor pressure, and its only dependant on the temperature, not the level in the tank.
When you are using propane form the tank you can sometimes see the condensation line marking the liquid level in the tank. Otherwise, pour warm water over the tank while propane is being used (the faster the flow out the better) then you can feel the level.... cooler below the liquid level.
I use a fish scale to check my tanks. The tank should be labled with a Tare Weight, which is the weight of the tank when empty, marked TW. Subtract that from the measure weight, and that's how much you have left!
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Old 06-05-2014, 08:39 PM   #17
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Just got a 277HW and it has the automatic switch over but how do I know how much is in each tank?
The simple answer - you don't!

Other than weighing, which is a PITA if your gas tanks are tied down to the frame, you don't really know. There are a couple devices in the market but their accuracy is dubious. One looks like a pressure gage, but it's calibrated in Full - Empty. Another is basically a thermometer strip that runs up and down the tank. You pour warm water on it and the gas level appears as a difference in temperature. The best one I've seen looks like a pen. It has a ultrasonic device that can find the level of the tank as you run it up and down the side, kind of like a stud finder. Runs about $29. Just saw it in another thread here a few days ago.
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Old 06-05-2014, 09:00 PM   #18
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Thanks everyone the input was very helpful.
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Old 06-05-2014, 09:04 PM   #19
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Maybe I'm doing things the wrong way... But why not use one tank... And when it runs out, you switch over and replace the empty?
That's the best way of doing it, that way you always have a full tank and don't run out in the middle of the night or on a weekend when you can't get them filled. Been doing it that way since our first trailer in 1975.
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Old 06-05-2014, 09:10 PM   #20
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Like KDHfan said

Fully agree with KDHfan. Unless you are going to be far away from a propane source and was wondering how much was left in the one tank, why would you care? Just look at the guage every day and when one tank is empty and it has switched, fill it. If you have doubts about how much is in the primary tank and are going on a trip with no propane source, just fill it prior to departure.

I feel a lot better getting that off my chest.
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