More than 60 years of German engineering. More than 60 years of technological leadership. More than 60 years as a partner of research and development. 100% controlled atmosphere - now and in the future. Find out about the reasons for the unparalleled precision of Memmert appliances.
- When the heating elements enclose the interior as completely as possible, an optimum temperature distribution is guaranteed
A conventional temperature control chamber has a cubic interior. Ideally, a uniformly heated cube radiates heat with the same intensity from all six sides. The smaller the area heated in the interior of a temperature control chamber is, as is the case for example with ring heaters radiating heat from a point source, the poorer the temperature distribution is in the chamber. The heat transfer must be supported by motorised air circulation, dark chamber loads are heated too strongly, shaded chamber loads do not absorb any heat. Physics cannot be outsmarted, which is why the concept of heating the interior from all sides developed by company founder today is as up-to-date as ever.
- Figure 1: 52 metres of heating elements surround the interior of a Memmert oven with a volume of 749 litres, 6 separate circuits (see different colours) ensure an absolutely homogeneous temperature distribution
A Memmert oven with a volume of 749 litres is surrounded by 52 metres of heating elements. Six heating circuits are controlled independently of one another so that the temperature required is exactly attained and maintained at every point in the interior (see Fig.1) – linearly and without fluctuations. In Memmert appliances, heating is not simply switched off once the setpoint temperature has been reached. Rather, a permanent, gentle and smooth adjustment takes place at every point in the chamber. Benefits to the customer are paramount for us - we will do all we can for you. This is why we rely on our in-house know-how. A simple ring heater with an externally purchased controller would be considerably cheaper, but physics is also useful here to understand why this would result in our ovens and incubators losing their unique precision.
- Figure 2: Energy output of the Memmert UFP 500 compared to appliances from competitors
- Temperature distribution in an appliance comparison at 150 °C and 50% fan speed
The smaller the heating elements, the more they must be heated up to reach the required temperature in the interior of a temperature control chamber. A ring heater with an overall heating element length of one metre will even start to glow, making a gentle and accurate adjustment considerably more difficult to achieve. Apart from this, it also results in the heat emission (see Figure 2) and thus energy requirements being distinctly higher, as well as heating up the surroundings and increasing air conditioning costs in the laboratory.
Using heat distribution measurements in five technically comparable appliances, the quality advantage of our integrated heating and control concept was verified by an independent accredited test institute.
We will gladly demonstrate the detailed test results to you personally. Just get in touch with us at sales@memmert.com.
