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Bought a nice "Inches of Water Column" gauge


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Old 11-18-2017, 02:26:05 AM
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Default Bought a nice "Inches of Water Column" gauge

Have a neighbor that is having some issues with his RV generator not starting. A whole nother story. I read here about gas line lengths and ID size related to generator sizing for proper flow and inches of water column which I find out is a very low pressure to deal with. SO.... I looked on ebay and tried to find a gauge that is US made and reads easily. I found this FISHER Controls Inches of water column with Ounces per square inch on the same scale. I researched the company ans they have been around a long time.
So I bought this gauge used for $19.99 plus $7.50 shipping on ebay. Gauge is nice, lightly rests on the "0" stop. Is there a STANDARD that I can check it against such as my home natural gas supply? What is "Normal" pressure and do you measure it while there is demand? Is the pressure the same on say an RV propane system after the regulator? Thanks for any information.
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Old 11-18-2017, 03:27:40 AM
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Default Re: Bought a nice "Inches of Water Column" gauge

I used to set up gas fired equipment. Never found those gauges accurate enough. You can check it against a u tube manometer. A piece of plastic tubing taped to a ruler works fine, and is always accurate. Put water in plastic tube and ruler reads inches of water.
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Old 11-18-2017, 04:11:41 AM
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Default Re: Bought a nice "Inches of Water Column" gauge

I use a Magnehelic gauge. Accurate to within 2%.
It's very sensitive and can be calibrated to a manometer.
http://magnehelic.com/
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Old 11-18-2017, 10:15:29 AM
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Default Re: Bought a nice "Inches of Water Column" gauge

Quote:
Originally Posted by lokay5 View Post
I use a Magnehelic gauge. Accurate to within 2%.
It's very sensitive and can be calibrated to a manometer.
http://magnehelic.com/
When I worked I carried a dwyer 100 inch slack tube along with a standard manometer along with a magnehelic instrument and transmation calibrating equipment certified to nist standards. Fisher makes excellent equipment.
Bob
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Old 11-18-2017, 10:42:24 AM
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Default Re: Bought a nice "Inches of Water Column" gauge

In case you do decide to check your gauge for accuracy, and you do make up a U tube manometer, google this:
"how to read a u tube manometer"
so you are sure to read it correctly.

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Old 11-18-2017, 01:15:32 PM
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Default Re: Bought a nice "Inches of Water Column" gauge

Water U-tube is a good physical standard to check it against.

Even easier to drop a tube in some water and pull it out till it just starts to bubble, measure depth of tube end. (I wanted a quickie solution, so I taped up end of a short plastic pipe and filled it with water ( plastic vac cleaner wand)
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Old 11-18-2017, 03:04:11 PM
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Default Re: Bought a nice "Inches of Water Column" gauge

Quote:
Originally Posted by PopsGarage View Post
When I worked I carried a dwyer 100 inch slack tube along with a standard manometer along with a magnehelic instrument and transmation calibrating equipment certified to nist standards. Fisher makes excellent equipment.
Bob
Almost all of my jobs were an airplane flight and car rental away. I tried to go with minimum of gear. I carried the first 2 with a vial of Florsheim green to color water. Magnehelic is a expensive, very nice instrument, but did not like the way it was treated in checked baggage.

I used standard manometer to set regulators, vacuum breakers and pressure switches, along with stack gas analysis. I would shut everything off but unit under test and use utility gas meter to determine CFM.
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Old 11-18-2017, 06:36:45 PM
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Default Re: Bought a nice "Inches of Water Column" gauge

I have one of these gauges made by USG.
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Old 11-18-2017, 07:33:10 PM
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Default Re: Bought a nice "Inches of Water Column" gauge

I wouldn't have a propane genset without both high pressure and low pressure gauges. If anything goes wrong, a quick glance gets you a long way with troubleshooting.

I use several of these 0 - 10 and 0 - 30 inch H20 gauges on my woodgas reactor and for other related things. Surplus center used to have them but I told too many people in the woodgas community about them and those gauges are no more!

Lesson learned?

But then, of course, one can always go the microcontroller (arduino) route adding one of these:
https://moderndevice.com/product/pressure-sensor-mpxv/


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Old 11-18-2017, 07:52:22 PM
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Default Re: Bought a nice "Inches of Water Column" gauge

I had removed one of my propane tanks to be refilled. I removed the gas feeder hose to the trailer and attached the gauge. I turned on the tank and it read 11 inches of water column right on. With the gas on, I quickly removed the gauge hose then replaced it on the end of the regulator. It went right back to 11 inches. So I guess I bought a good gauge for $20.00.
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