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Centrifugal Mist Collectors

What You Probably Didn’t Know About The Centrifugal Mist Collector

Are all the brands the same?

If you have a brand that says Aercology, Donaldson, or AER Control Systems then all the parts, filters, and motors are identical. All of the suppliers are the same source. The only difference between them are the color and model numbers.

If you need replacement filters, parts, and motors please contact AER Filter Sales

How long should my filters last before they need to be changed?

That question is always difficult to answer as the life of the filters depend upon how dirty your coolant is, the volume of mist captured, and the type of machining process. If you are grinding or machining cast iron versus cutting then your filters will need to be changed more often, because you are probably collecting very fine metal particulate called swarf along with the coolant.

If you are running the mist collector only an hour or two a day versus 24 hours a day the longer running mist collector will needs its filters replaced sooner. Centrifugal Mist Collector filters should be replaced every 3 to 6 months. If you need filters please contact AER Filter Sales.

I see that the drum houses two filters a thin one (Throwaway Liner) and a thick one (Primary). Do I need to change both of these filters?

No, the throwaway liner will see more dirt than the primary one so it will need to be changed more ofter. If you regularly change the throwaway liner you should not have to change the primary. If you need these two filters please contact AER Filter Sales.

How can I tell if the filters are dirty or need to be changed? Can I place a gage across the filters to measure the pressure drop?

You can’t put a gage across the main filters, because the drum that houses the filters is also part of the fan. It would be the same thing as measuring the pressure drop across the fan; you wouldn’t be measuring the filters just the fan.

The only true method of determining if you have to change the throwaway liner is to look at it and hold it up to the light, if it is more than 50% blocked with dirt then it needs to be thrown away. To determine how long the filter will last check it once a month. We recommend keeping a record on each centrifugal mist collector to know when to change the filter. Please contact AER Filter Sales for filter replacements.

I have had my Centrifugal Mist Collector for a while and at first it ran smooth and quiet, but after a few months it is noisy and it vibrates, why is this happening?

The centrifugal mist collector has a drum which houses the filters throwaway liner and the primary along with the fan blades, the drum spins at 3450 RPM, we balance every drum so that no vibration occurs. If there is a large amount of dirt, metal, or gel in water soluble coolant inside of the drum or filters it will cause the drum to vibrate. If you catch this early we have solutions to prevent this, please contact AER Control Systems.

If you don’t catch this early the vibrating drum will cause damage to the bearings in the motor, either the bearings will need to be changed or you will need a new motor, please contact AER Filter Sales for the motor replacement.

I have replaced both filters in the drum and the unit still vibrates?

It is very important when you position a new primary felt liner, the thicker one, in the drum that you align the ends or seam up to the slot cut into the face of the drum. Believe it or not a shift to either side of the slit will cause an in-balance causing the drum to vibrate. Try to shift the seam so that it aligns with the slot and the vibration should go away.

If it doesn’t then perhaps the bearings in the motor are bad. If after replacing the motor you still have a vibration then perhaps the drum is bad, you can either get it re-furbished by AER Control Systems or purchase a new balanced drum. Please contact AER Filter Sales for a new or re-furbished drum.

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