Vacuum gauge for a vacuum plate - any recommendations?

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27 May 2023 18:58 #272280 by knipknap
I built myself some vacuum plates like this:

 

To run this thing, I am considering one of these sets:

 

The reason being:
- They are very cheap.
- I want to use the container as a vacuum buffer so that the pump doesn't have to run the whole time.

I am missing one piece of the puzzle though: A vacuum gauge that I can connect to my interface card (MESA 7i76e).

Any recommendations?
Attachments:

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27 May 2023 21:36 #272287 by tommylight
Wrong vacuum pump, you need the other type with high flow, this one is very low flow.
You can always use a normal air compressor as a vacuum pump, just reverse the in/out pipes.
And it has a much bigger buffer, just keep in mind it will not switch off as there is no pressure at the output anymore.

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27 May 2023 21:40 #272288 by knipknap
Are you sure that you aren't thinking of big vacum plates that allow for leakage? The small ones are made to be actually air-tight and do not need high flow.

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27 May 2023 21:49 #272290 by tommylight
Your picture shows a 3D printed plate, those leak, always, although PETG should be OK for leaking with at least 5 perimeters.
Also, HIPS is very good at layer adhesion, but probably PETG is better for this.
Give it a try, might just work OK.

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27 May 2023 21:51 #272291 by knipknap
It's not 3D printed, it's milled from HD-PE.

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27 May 2023 22:49 #272295 by rodw
Some things like this
www.aliexpress.com/item/1005005042915668....product.mainProduct

You should be able to find a LM358 low signal amplifier to bring it back up to near 24v for a Mesa analog input or simply use a Mesa THCAD-5 to read the voltage output which would be much more accurate.

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28 May 2023 05:09 #272313 by itsme

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28 May 2023 10:24 #272324 by knipknap
Thanks for the recommendations, these sensors are what I am looking for.

Though meanwhile I realized that the plan may not work out at all, because I am not sure whether the pump has a valve to keep the vacuum when turned off.

At least I may need more parts to make this work. I guess I'll start with buying only a pump and order additional stuff step by step to improve the overall setup.

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28 May 2023 12:33 #272335 by itsme
I used a similar setup. The pump will leak a bit, but not that much.
The hysteresis setting of the sensor will deal with that...

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28 May 2023 22:12 #272370 by knipknap
Cool, that's good to hear. I placed the order for the pump today and will see how it goes.

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