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

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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Working With Multiple Ranges of Vacuum in the Semiconductor Industry

Working With Multiple Ranges of Vacuum in the Semiconductor Industry If you are managing a vacuum process in the Semiconductor industry, you need the accuracy and isolation of several capacitance manometers, optimally all in one reading, but often have to look at several confusing displays. When dealing with 4 or more decades of vacuum, single readings are difficult to interpret, time consuming and frustrating!  A solution to this problem is

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HVAC Repair and the Black Hole: Diagnosing Poor System Performance

HVAC Repair and the Black Hole: Diagnosing Poor System Performance Ever been in the black hole of HVAC service calls: you’ve checked x, and y, and z…and still a call back?? Let us help you out of that dark, creepy place!  First, using a vacuum gauge during HVAC troubleshooting helps you to avoid the 4 common pitfalls of poor HVAC performance, which are: Half charged systems,  Over charged systems, System not clean and free of contaminants, and System is not leak free. How do you use a vacuum gauge to tell the status of your system and detect leaks and

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Vacuum Gauges And Connectivity: Accessing Your Data From Anywhere

Vacuum Gauges And Connectivity: Accessing Your Data From Anywhere Having a network-connected vacuum gauge enables you to save your vacuum data (great for troubleshooting at a distance with a master tech or scientist) and makes it accessible wherever you need it, across the hall or around the world.  Connectivity Options The vacuum gauge connectivity required for the job depends on the system being used. Basic analog readings work for quick, simple measurement, when you want to observe vacuum pressure at a given moment. Other applications require detailed analytics that leverage current vacuum measurements and trends over time. This data may need to

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Vacuum Magic: Houdini’s Guide to How A Vacuum Gauge Regulates Pressure

Vacuum Magic: Houdini’s Guide to How A Vacuum Gauge Regulates Pressure Understanding how a vacuum gauge regulates pressure can be a mystery.  Watch Nicole, as she demonstrates vacuum pressure regulation using a digital vacuum controller, balloon, and glass jar.  Before our experiment, let’s review some vacuum vocabulary: Vacuum controller: a device that is used to maintain pressure for a period of time.  The method of vacuum regulation used is called downstream pressure control. Set point:  the targeted vacuum value the user wishes to maintain. In our experiment, the set point is chosen and the switch is turned to regulate (on). The

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Safety 1st: Benefits of Using a Vacuum Gauge to Perform a Leak Test

Safety 1st: Benefits of Using a Vacuum Gauge to Perform a Leak Test When troubleshooting an HVAC system, using a micron vacuum gauge (that has on board analytics) as a leak test is a safe way to assess why the system is not performing. A common problem in vacuum systems is that they are wet and have contaminants. Using a vacuum gauge enables you to determine when your system is dry, without damaging it. Vacuum testing is safer than pressure testing (implosion vs. explosion).  The last  thing you want to do is damage the HVAC system and be responsible for

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