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Vacuum knowledge straight from the source. Browse DigiVac's products and educational materials for vacuum experts by vacuum experts.

QF/KA Flange Connection Tips For Improved Vacuum System Performance

QF/KA Flange Connection Tips For Improved Vacuum System Performance Quick-Flange vacuum fittings, known as QF, KF, NW or, in some instances DN, are a widely used flange-type connection system serviceable in rough to medium-vacuum systems. They offer reliable, convenient interconnecting of vacuum components.   QF flange connections are simple to implement.These guidelines will ensure that your system delivers the best vacuum performance:

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Moisture in Oil Transformer Tanks: Avoiding Mechanical Breakdowns

Moisture in Oil Transformer Tanks: Avoiding Mechanical Breakdowns Remember the ol’ transformer oil purification experiment from applied chemistry class? Thinking of it as you learn about moisture and oil contamination can be very useful. Internal moisture in transformer oil tanks is not distributed uniformly, and can be concentrated in the most dangerous parts of the system. Water in the presence of oxygen, even at microscopic levels, is a contaminant that reduces the insulation properties of Oil. Water enters into the transformer oil over time, which reduces the oil’s dielectric (insulation) properties.  As the transformer becomes wetter, it decays even faster, which increases the

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Controlling Vacuum Ramp Rate to Solve Manufacturing Process Challenges

Controlling Vacuum Ramp Rate to Solve Manufacturing Process Challenges In the manufacturing industry, it is common practice to manually turn valves to achieve a ramp rate that ensures the material of interest is not sucked out.  Consistent process control is critical; if manual, this can be very difficult to do accurately in medium or high vacuum situations. Sometimes, a few modifications to existing technology achieves a very slow initial evacuation using a ramp rate of 126 Torr/hour so as not to disturb the material of interest, while achieving an ultimate vacuum below 100 microns, all automatically. To learn about a

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Custom Vacuum Solutions-Practical Application + Engineering Excellence

Custom Vacuum Solutions-Practical Application + Engineering Excellence A custom vacuum solution approach starts with a customer who has an engineering challenge in a specific, unique environment. By going to an OEM with a strong team of engineers, a customer can often get free advice initially, and, ultimately, the solution s/he needs. Often, though, research and product design engineers wrestle with an engineering challenge longer than necessary, which can often be costly in terms of system failure, downtime and loss of productivity. Why wait? The types of engineering challenges that come to an OEM are robust, otherwise the customer would have

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8 Installation Tips For a Leak Free Vacuum System

8 Installation Tips For a Leak Free Vacuum System INTRODUCTION: Vacuum sensors that have a threaded interface (e.g., like those found on Model 215v or Model 200) require threaded pipe connections. Threaded pipe connections are commonly used in vacuum sensors, vacuum pumps and rough-vacuum systems. This type of connection can provide economical, reliable service if properly installed. By following a few guidelines you can use threaded pipe to make connections that should be leak free in pressures down to 10 -4 Torr or better. However, low quality pipe and cheap pipe fittings are commonly used in rough vacuum systems, which usually results in

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Solutions to Prevent Oil Backstreaming in High Vacuum Environments

Solutions to Prevent Oil Backstreaming in High Vacuum Environments Oil backstreaming can occur in the event of a power outage when oil from the rotary vane pump backs up through the forelines into the vacuum chamber of the turbo pump. In some applications, minor backstreaming has no impact; in others, where the purity of materials is critical, backstreaming cannot be tolerated. It is advantageous in high vacuum systems to include automatic interlocks to avoid the effects of backstreaming and contamination of the turbopump. This can happen during a power outage or other system failure. Many high vacuum systems do not have

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Flow Measurement & Vacuum Control in Plasma Treating Systems

Flow Measurement & Vacuum Control in Plasma Treating Systems INTRODUCTION: Plasma is an effective form of surface treatment. It is a crucial process step to ensure that surface contaminants don’t prevent bonding.  For a low pressure plasma treatment process, maintaining a precise vacuum level can make plasma runs more repeatable by isolating the vacuum pressure variable.  PROBLEM: Some plasma treating systems do not have flow measurement and process control features, which are required for hitting a target vacuum level. Furthermore, as vacuum pumps age over time, their base pressure changes.  A changing base pressure and thus plasma pressure may cause inconsistent

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Industry Spotlight: Medical Application of Aspiration Vacuum Control

Industry Spotlight: Medical Application of Aspiration Vacuum Control A surgical equipment manufacturer asked us to craft a product that would help physicians maintain consistent vacuum control during surgical procedures such as liposuction. Existing vacuum pressure controllers could not maintain consistent pressure, resulting in a build-up of vacuum pressure during a blockage of the cannula, resulting in a stall of vacuum, followed by an increase in vacuum pressure after the blockage was removed.  THE SOLUTION An enthusiastic team of engineers began the iterative process of determining the customer’s exact usage context so that the solution would be practical, effective and safe. This

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Evacuation During HVAC Installation: An Important First Step

Evacuation During HVAC Installation: An Important First Step With every HVAC installation, there are a lot of steps to be followed. It doesn’t help when you have frazzled customers who haven’t had A/C in 4 days, where  the old man is disgruntled because this system is costing hundreds of dollars, and the wife looks like hell and just wants you to get out of there.

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Death, Vacuum Tube Contamination & Taxes: How to Diagnose and Clean

Death, Vacuum Tube Contamination & Taxes: How to Diagnose and Clean One thing is for sure in the HVAC industry: at some point you will run into contaminated sensors… just like death and taxes, guaranteed!  If your chosen micron gauge uses thermocouple vacuum tubes, read on!  Let’s review the mechanics of thermocouple tubes. The inside of a thermocouple tube has two wires in the shape of an X, and measureable gas surrounds those wires.  The thermocouple element senses temperature  as the surrounding gas cools the thermocouple. Because the temperature of the wire is directly proportional to the amount of gas in

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