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Joined: Feb 2018
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Hi,

I have a Sweetwater aq101 rocking piston compressor. Last year I installed a pressure gauge coming right out of the compressor (9” of line in between compressor and gauge). When I turned the compressor on the needle would rapidly oscillate between two values. I assumed this might be because of “how rocking pistons work”. This spring I went to turn the compressor on and the gauge was jammed. Opening up the gauge I found that the gear on the needle was completely worn out. I assume this is from several months of oscillating back and forth.

Any suggestions on how I might better set up a new gauge so that this doesn’t happen again?

Thanks in advance.

Ted

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IMHO you get what you pay for. I THINK a liquid filled gauge will cure the oscillating and a higher quality gauge will last much longer.

Last edited by wbuffetjr; 04/12/20 03:14 PM.

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An oil filled gauge will sure help. Another must on this type of pump is an in-line orifice of sorts. Best way to do this is fill the inside of hose barb going to gauge with solder then drill a very small hole in center. 1/32" would be sufficient for airflow, if it was liquid in the line, 1/16" would be ok. This will baffle the pressure and allow a much steadier reading.

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This is an interesting idea Snipe. If I get a better oil gauge, do you the solder modification is a “nice to have” or a “must have”?

Last edited by ted_1209; 04/12/20 07:31 PM.
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As mentioned, a liquid filled gauge will dampen the bouncing of the needle on the gauge. A liquid filled gauge should last on that compressor at least 8-10 years.


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Originally Posted by ted_1209
This is an interesting idea Snipe. If I get a better oil gauge, do you the solder modification is a “nice to have” or a “must have”?

We use this in several of our aircraft systems to stabilize critical readings in certain avionics that still use what we call "steam" gauges (direct, non electrically modified signal).
I won't say it's a must have, but it takes the pulse down to a buffered level without changing actual pressure values.

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Very helpful, thanks everyone. I will order a liquid filled and see what happens, and modify with solder if needed

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Closing the loop on this. I ordered and installed this gauge: https://www.amazon.ca/Winters-Stainless-Pressure-Internals-Accuracy/ . Everything now seems to be working well now, so I guess I just needed a better gauge.


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