Advanced Vacuum Control

Our most recent post addressed the benefits of proportional – only vacuum process control. Though this approach is well suited to many processes, in some cases more accurate (or precise) control of the pressure level is necessary. Under such circumstances, employing PI (proportional-integral), or full PID (proportional-integral-derivative) control algorithms are appropriate solutions. If a P-only approach…

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Proportional (2 Point) Vacuum Control

In our prior post, we talked about using variants of the classic PID algorithm in order to control vacuum processes.  In the simplest form, the PID control loop can be reduced to a P-only, or 2-point, algorithm.  For example, by using a PLC or other control module to read an accurate vacuum sensor and actuate…

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Approaches to Vacuum Control

Establishing good control over vacuum processes has numerous benefits, such as helping to improve process yields, achieve more repeatable results, and reduce process times.  And there are several options for controlling vacuum processes to achieve these various benefits.  This post will briefly review some of the more common approaches to vacuum control.  Subsequent posts will…

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School Lab Vacuum Installation by Parent Volunteers

In order to support a strong STEM program, DeMatha Catholic High School (Hyattsville, MD) renovated and modernized their science classrooms and laboratories in 2011.   Students and their parents participated quite actively in this project, donating their time and talents in order to help avoid cost overruns on this tightly budgeted project.  The school was fortunate…

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Operating Cost Benefits of Oil-Free Vacuum Part 2

In part 1 of this, we reviewed the general advantages of using dry, chemical-resistant diaphragm pumps for process scale-up applications.  In part 2, we will delve into the process of configuring the mini-plant in order to realize the benefits of oil-free pumps. MINI-PLANT OPTIMIZATION The processes conducted in DSM’s mini-plants are normally multi-step operations including rectifications, distillations,…

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Operating Cost Benefits of Oil-Free Vacuum – Part 1

INTRODUCTION Historically, mini-plants have utilized oil-sealed rotary vane vacuum pumps as a vacuum source because they provide relatively high flow rates and because they can reach relatively deep vacuum levels, such as 10-3 mbar. The same can be said of kilo labs. However, rotary vane pumps also include several critical disadvantages which make their use in…

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Dry, Chemical Resistant Vacuum for Process Development and Kilo Labs

VACUUBRAND’s dry, chemical resistant pumps provide an ideal solution for use in process development, scale-up work, and kilo labs.  With no sealing fluid to replace, our dry pumps provide a low maintenance, low operating cost alternative to oil-sealed rotary vane pumps and water ring pumps.  With 15,000 hour service, these pumps can increase productivity by…

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Vacuum Measurement – Pirani Gauges

Pirani gauges are a group of indirect measuring pressure gauges which measure the thermal conductivity of the gas sample.  Pirani gauges are typically used in the fine vacuum range (1 torr – 10-3torr), as this is the range where they achieve the best accuracy.   A typical accuracy spec for these indirect-reading gauges is ±15%…

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Vacuum Measurement – Capacitive Gauges

In one of our prior posts, we talked about the key differences between direct and indirect vacuum gauges.  One of the most common direct gauge technologies is the capacitive gauge.  This post will review how these gauges are constructed and how they work. At their core, capacitive gauges consist of a thin diaphragm and two…

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Vacuum Measurement Made Easy

Finding a vacuum gauge for monitoring chemical processes can be a challenge.  There are few gauges that simultaneously cover the appropriate vacuum range with sufficient accuracy and have the ability to cope with regular exposure to aggressive chemicals.  VACUUBRAND’s VACUU·VIEW™ and VACUU·VIEW extended™ gauges address these needs. These compact, easy-to-use gauges are designed for long life,…

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