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Reflow N2 PPM Stability

Views: 681

#90507

Reflow N2 PPM Fluctuation Issue | 1 February, 2024

I am facing a ppm fluctuation issue. The customer provides a limit of 600 to 1500 PPM in the Reflow process and it should be under spec. But we are facing the issue during the running production and the ideal state ppm flucate sometimes goes below 600 and sometimes more than 1500ppm. The higher side goes 1500 to 1900PPM and the lower case 600 to 400PPM. I want to know how we can control the N2 flow velocity and Valume to control the PPM fluctuation.

Please suggest.

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#90544

Reflow N2 PPM Fluctuation Issue | 8 February, 2024

A welding regulator can regulate flow over pressure. Maybe look at one of those.

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#90545

Reflow N2 PPM Fluctuation Issue | 8 February, 2024

Is this bottled N2 or a Generator? Is it 99.995 or 99.999?

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#90546

Reflow N2 PPM Fluctuation Issue | 8 February, 2024

Liquid N2 tank big size 99.9999.

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#90547

Reflow N2 PPM Fluctuation Issue | 8 February, 2024

I know that we maintain lower PPM count from our N2 Generators when we can lower the flow rate. I'm not sure if that would help you or not.

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#90548

Reflow N2 PPM Fluctuation Issue | 8 February, 2024

You face this types issue before.

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#90549

Reflow N2 PPM Fluctuation Issue | 8 February, 2024

Does your nitrogen supplier have any recommendations for controlling flow? Sounds like the regulators are inadequate or not working properly.

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#90550

Reflow N2 PPM Fluctuation Issue | 8 February, 2024

fluctuating PPM is not the Nitrogen if you are using liquid Nitrogen. It is the Oxygen. Your problem is not with the Nitrogen flow, it is Oxygen getting in your oven.

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