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Hidden features of the vacuum oven

A vacuum drying oven offers unique advantages. In this article you will learn more about its benefits.

The heating and drying ovens sector finds several laboratory ovens in use. Often these have special purpose given the applications they are dealing with. For users involved in application sectors such as the following will find a vacuum oven most useful:

  1. Pharmaceutical industry:  powder and granulate drying, determination of water content for quality assurance
  2. Medical technology: drying of titanium powder for orthopedic materials
  3. Food industry: drying of cultures and probiotics, drying of fruits, preservation and dehydration of food
  4. Electronic industry: drying of components and printed circuit boards

Detailed information is now available in the vacuum oven whitepaper. Register here to access it in our downloads section. For further information on drying ovens, its technology, uses, versatility and more, read this explainer blog.

What is a vacuum oven?

This device, also called a vacuum drying oven, is used for its versatility in laboratories, engineering and industries. Such a device, as per Handbook of Food Powders, uses a “method for drying materials sensitive to heat or oxygen (such as microorganisms and enzymes) due to the advantage of removing moisture at low temperature and minimizing the possibility of oxidation reactions” (A. Ghandi, ... I.B. Powell, 2013).

What is a vacuum oven used for?

As the description above suggests, the laboratory vacuum oven usage is quite diverse and a good indicator of that are the list of applications listed in the beginning.  

Areas of fruits, vegetables, packaged food materials, storage stability of foods, production of probiotic cells, drying of powders with microorganisms and enzymes, preservation of starter cultures, foodstuffs to cosmetics, granulate, watches, books, printed circuit boards, to electronic components or injection molds and more can be explored with it.

How does a vacuum oven work?

The vacuum drying oven principle explains that drying takes place where moisture can be removed at low temperature values. It is a “particularly suitable technology for drying oxygen and heat sensitive compounds or microorganisms. Indeed, it can be operated at low temperature since the boiling point of water decreases with a decrease in pressure” (F. Grattepanche, C. Lacroix, in Microbial Production of Food Ingredients, Enzymes and Nutraceuticals, 2013). This explains the working principle for the vacuum drying oven method.

Features of a Memmert vacuum oven

  • Temperature range up to +200 °C
  • Vacuum control range: 5 to 1100 mbar
  • 3 model sizes (29 to 101 litres volume)
  • 1 model variant: TwinDISPLAY
  • Anti-splinter; VDE-tested door construction for all models
  • Pump control: Optimised rinsing of the pump membrane as well as signal output for switching the pump ON/OFF according to requirements.
  • Optional: Pump base cabinet and energy-efficient vacuum pump

Hidden features of a vacuum oven

A Memmert vacuum drying oven offers unique advantages. Firstly, here are some takeaway features:

  1. Intelligent direct heating with calibration function
  2. Short process times due to digitally controlled vacuum cycles
  3. Enormous energy saving due to stepless adjustable vacuum pump
  4. Longer service life of the pump diaphragm
  5. Pressure reduction lowers the boiling point of water which means the water can already evaporate at temperatures below 100 °C
  6. Gentle for the load

Read about the features of a vacuum oven in this infographic.

Read about the features of a vacuum oven in this infographic.

Multi-level sensing & heating

The intelligent direct heating via individually positionable thermoshelves with separate sensors guarantees the shortest possible heating and process times. The control circuits react precisely to different loads or humidity and maintain the set temperature uniformly during vacuum drying. Due to the direct contact between the heating and the load, there is practically no heat loss. Each thermoshelf can be controlled and calibrated separately.

This image shows the heating system temperature distribution of the Memmert lab vacuum oven using thermoshelf technology.
Heating system of the Memmert vacuum oven.
Temperature and deviation values of various sizes of a Memmert vacuum oven. This table shows temperature values from 50-100 degrees Celsius. The sizes of the vacuum drying ovens shown here range from 29 to 101 liters.
Temperature and deviation values of various sizes of a Memmert vacuum oven.
This feature inside the laboratory vacuum oven makes use of the individual thermoshelves for direct heating which guarantees the shortest possible heating and process times.

Intelligent direct heating via individually positionable thermoshelves.

Significantly reduced process times

Digitally controlled vacuum cycles, in which the working chamber is vented at short intervals, considerably shorten the drying time. Ramps with different temperature and vacuum setpoints can be programmed easily and quickly via the AtmoCONTROL software.

With the software, intuitive programming of different temperature and vacuum setpoints are seen. Furthermore, display of all logged set and actual values are noted as well as archiving of ramps and program sequences.

Digitally controlled vacuum cycles considerably shorten the drying time through the software interface in a Memmert drying oven.

AtmoCONTROL software interface when using the Memmert vacuum oven.
This image taken from the Memmert AtmoCONTROL software on a vacuum oven shows how the individual thermoshelves are calibrated and adjusted.

Calibration and adjustment of the thermoshelf using the user friendly software AtmoCONTROL.

Speed-controlled vacuum pump and turbo drying

In combination with the speed-controlled, chemically resistant vacuum pump, the VO series saves around 70% energy in ramp operation compared to an uncontrolled pump. The ultimate vacuum of up to 2 mbar enables a wide range of applications, and due to demand-oriented pump control and thus optimised flushing processes, the diaphragms have a significantly increased service life. Another feature is that of the turbo drying feature in a Memmert lab vacuum oven.

For more information on Memmert, visit the product page, contact the  sales team or subscribe to the newsletter to learn about more hidden features.

These comparitive graphs show how the Memmert vacuum drying oven, VO series, saves around 70 % energy in ramp operation compared to an uncontrolled pump.

Comparison between a convention pump and a Memmert speed-controlled vacuum pump.
These graphs taken from the Memmert laboratory vacuum oven shows the temperature, pressure and time distribution under the influence of the turbo drying feature.

Turbo drying feature of the Memmert VO.