Choosing the right vacuum pump for your needs:When it comes to selecting the correct vacuum pump for your application there are a number of issues that need to be considered. There is a vast array of vacuum pumps available: Rotary Vane, Diaphragm, Screw and Turbo pumps, just to name a few. The two main specs required for selecting the correct pump are the vacuum level and the flow rate. Once these have been established the range of pumps available for your application will be less confusing.
The next thing you need to look at is the application itself. Is it a clean room application? Is it a large industrial job where there is plenty of water vapour?
These elements need to be discussed and considered carefully. The next subject is the material of the pump. Some applications are subject to a high amount of corrosive or acidic vapours, so Teflon or stainless steel will need to be a major component of the pump. Some pumps however cannot offer a high grade of protection so a special type of oil is required. This is the case with rotary vane pumps.
Power supply is another important aspect. This can be single phase, three phase, DC supply; sometimes even frequency converters are necessary.
It is important that you also consider the type of protection required. The pump could be in a hazardous area, which could possibly cause an explosion if the motor is not of the correct protection class.
As you can see there are a number of variations and performance elements that need to be taken into account when selecting a vacuum pump for your next job. If you are unsure about what is available or need assistance then please contact us for expert advice.
Continuous duty. Vacuum pumps available cover the range all the way from the highest quality European laboratory vacuum pumps all the way down to our budget and very economic vacuum pumps from as low as $395.00. A $395.00 vacuum pump can run forever, at or near, maximum vacuum pressure. However continuous duty at rough vacuum pressures increases exhaust vapour and reduces oil pressure. Coupled with any contamination from the application, the life of the pump will be reduced. Price wise, it is at the lower end of the price/value ladder so expectations should be proportional to the price. A similar high quality laboratory or European manufactured pump could be around $5,000.
Experiencing Poor Vacuum?Ultimate vacuum will not be instantaneous. It is relative to pump capacity and system size. If it appears the rotary pump is not achieving high vacuum, check as follows:
Oil level correct when pumping.
All fitting hoses are tight and valves shut.
If no improvement is achieved, check with a known good McLeod gauge or digital electronic gauge. An adequate vacuum measurement for the refrigeration industry can only be determined with a good quality and accurate digital vacuum gauge. For general vacuum measurement and depending on whether the user already has refrigeration gauges and hoses (excluding the vacuum gauge), you could add on an independent dial vacuum gauge or if you do not have any of the above, buy a manifold with an integrated dial vacuum gauge. These would both also require some adaptors. This assumes a strictly DIY approach as professional installers would not use a dial vacuum gauge.
Alternatively, carry out the following procedure:
Remove pump from system.
Connect gauge to suction fitting positively sealed.
Run pump. A McLeod gauge should indicate a vacuum of between 50 and 1 micron. An electronic gauge will show approximately 250 to 20 micron after five minutes, depending on the type of pump.