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Tips - Συμβουλές

Dry backing pumps

Question:

In my turbo pumping station, I use a diaphragm pump as a backing pump. I would like an alternative dry backing pump with a higher pumping speed and improved base pressure....

Read more about this by clicking here.
 

Leak Detection and Water Pressure Test, Part 1 + Part 2

Question:

Prior to the helium leak test, all our parts are cleaned by washing. Then, the parts are dried by flushing with compressed air. After that the products are submitted to leak testing and are completely dried in the vacuum....

Read more about this by clicking:
here for Part 1.
here for Part 2.
 

The most common errors when using vacuum pumps and how to avoid them, Part 1 + Part 2 + Part 3
Rotary Vane Pumps/Roots/Turbo Pumps

The ideal vacuum solution at the best price is almost always the preference from the viewpoint of the customer. This fact poses the danger that a less optimal pump solution is selected for cost reasons.........

Read more about this by clicking:
here for Part 1.
here for Part 2.
here for Part 3.
 

Vacuum Grease and O-Rings

Question:

The O-ring in my vacuum chamber is not 100 % leak-proof after long use. Tightening the screws doesn't help. I was advised to lubricate the O-ring with vacuum grease. This trick should make the vacuum better. Should I do it?

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Units for expressing the helium leakage rate

Question:

How come the rather odd unit mbar · l/s is used to quantify leakage rates? Is there any explanation for this?

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Using built-in rotary vane pumps

Question:

I am operating a rotary vane pump in an analytical instrument. The heat dissipation of the rotary vane pump leads to a drift of the measurement signal. In addition, the pump compartment is often contaminated with oil. What could be improved here?

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Leak detection in large chambers: Using auxiliary pumps to speed up measurement.

Question:

I have a leak in my chamber and am using my helium leak detector to find the exact location of the leak. But after spraying a leak, it takes a very long time until the signal is actually displayed....

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Leak detection using auxiliary pumps

Question:

In your last tip of the month, you described accelerating the detection of a helium leak through the use of a turbopump. I tried that. But it took me more time just to get the turbopump going than it did for the remaining measurement. What could be the reason for that?

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Cleaning vacuum measuring equipment , Part 1 + Part 2

Question:

What is the best way to clean vacuum gauges? Which equipment and tools are needed?

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here for Part 1.
here for Part 2.
 

Pump down curves and what one can learn from them , Part 1 + Part 2

Question:

The pumps in my vacuum system are starting to get old and it takes much longer for them to pump down. I recently requested an alternative solution for the existing pumping system from you....

Read more about this by clicking:
here for Part 1.
here for Part 2.
 

Limitations of leak testing using the pressure change method

Question:

The tightness requirements for my components are becoming more stringent. This is often the result of increasingly strict environmental regulations. For my process, I use testing technology based on the pressure change method. What are the limitations of this method?

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Virtual Leaks

Question:

What is a virtual leak?

Find out by clicking here.
 

Extending intervals between oil changes in rotary vane pumps

Question:

I am a user of an analytical measurement instrument, a gas chromatograph with mass spectrometric detection (GC-MS). All I want is to obtain the analysis data reliably and without any fuss....

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What is a compression ratio?

A compression ratio is generally the ratio of discharge pressure to intake pressure of a pump. For the turbomolecular pumps, in particular, it is the ratio of the pressure measured at the fore-vacuum flange, to the pressure measured on the high vacuum flange.

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