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Frequently Asked Questions

  • What is lyophilization?
    Lyophilization (or freeze drying) is a method of drying (not only) food. The food is frozen and the water is removed by vacuum. This is the simplest possible explanation. If you are looking for a more sophisticated answer, you can find it here: Basic Principles Of Freeze-Drying.
  • How is lyophilization different from conventional drying?
    Lyophilized foods are much drier, have only 1 to 5% moisture. This will make it last longer. However, the leading properties include the preservation of most nutrients and vitamins or the ability to bring some lyophilized foods fresh. The standard methods of drying cannot do that.
  • What can be lyophilized in AMARU?
    From fruits and vegetables almost everything you can think of. Meat or various dairy products also freeze dry well. Enormously sweet products (honey, condensed milk) or very salty foods cannot be lyophilized.
  • What is the capacity of the AMARU freeze dryer?
    The typical capacity of AMARU is 7.5 kg of food. However, the capacity does not always have to limit the weight, but it can also be the area of the shelves. Example: AMARU has already lyophilized 15 L of water, but it is not possible to store even half a load of herbs, which limits the space on the shelves.
  • How long does drying take in AMARU?
    It completely depends on the amount of water in the product. It can be 14 or 48 hours. Most fruits and vegetables take about 30 hours (without freezing) when loaded with 7.5 kg. However, it depends mainly on the water content in the product, but also on the size of the individual pieces, or on the size of the area where water can leave the product.
  • Can I freeze dry different types of food at once?
    Yes, in theory there is nothing to stop it. During lyophilization, there is no transfer of smells or odors, and we tried to dry cherries and chicken stomachs and hearts together. But it practically doesn't make much sense during production. Always one food will be dried sooner, due to a different moisture ratio, and then it will take up space unnecessarily until the rest of the loading is dried.
  • Does the device meet hygienic standards?
    The product chamber and the product trays on which the food is dried are made of stainless steel 1.4301 (formerly AISI 304). The plastic components of the shelf system that may come into contact with food are made of copolyester, to which we can supply a certificate for contact with food. Compliance with the hygiene requirements was also verified by the State Testing Institute when assessing compliance with Directive on machinery 2006/42/EC.
  • How much does the AMARU freeze dryer cost?
    If there is no official distributor in your country, please contact us and we will send you a complete quote including accessories. We try to send quotes no later than the next working day.
  • What is the return on investment with AMARU?
    It depends on what you will dry in AMARU, for how much you will buy it and for how much you will be able to sell it. So we are not able to answer this question for you, but we will definitely help you to add the variable to the equation. Typically, the return on investment for existing customers is in the range of 3-5 years.
  • What are the operating costs of AMARU?
    It depends on the price of electricity per 1 kWh. One 30-hour batch normally requires about 33.5 kWh. Another item is mineral oil for a vacuum pump. This is a cost of about € 0.5 per batch.
  • Can the device be seen somewhere before purchase?
    If there is no official distributor in your country, do not hesitate to contact us and we will be happy to help you arrange a visit to our demonstration freeze dryer in Prague.
  • Is it possible to try AMARU with my product?
    Yes. Contact us to arrange details. Test lyophilization is free of charge. It is up to you to arrange the transport of the product to our address.
  • How do I order the AMARU freeze dryer?
    If there is no distributor in your country, please contact us directly and we will prepare a quotation for you. If you agree to the offer, just send us an email confirmation. We will immediately send you an invoice for the 50% deposit. Upon completion of production, we will contact you and send you an invoice for the remaining 50%.
  • What is the typical delivery time?
    If we have an instrument in stock or in the pre-finishing stage of production, the delivery time may be 1 - 2 weeks. In the worst case scenario where we have just started manufacturing AMARU we are usually able to ship within 12 weeks.
  • How is the service provided?
    We try to establish an exclusive distributors for each country, which will provide service of devices for that country. If there is no distributor in your country yet, we provide the service from Czechia.
  • What is the life-time of the AMARU freeze dryer?
    Because we have used mostly proven components from laboratory lyophilizers during the development, we can officially guarantee repairability for 10 years. But we believe that AMARU (with maintenance and service) will last as longer than that. The first AMARU was installed in the spring of 2018. Since then, it has been operating in a 24/7 demanding mode. We have a proven track record of 5 years under full usage.
  • What is the warranty for AMARU Freeze-Dryer?
    Standard 12 month warranty during which we provide repair and spare parts. A 2-year extended warranty can be ordered as an option.
  • What conditions must I ensure for the operation of the AMARU freeze dryer?
    AMARU doesn't really need anything more than one 230V socket with its own 16A circuit breaker. To ensure that it serves you for a long time and that you are comfortable enough to work, you need to ensure sufficient space around the unit, an ambient temperature between 15 and 25°C and good ventilation of the area.
  • What maintenance does the freeze dryer require from my side?
    A complete maintenance list is included in the operating instructions. You will definitely need to change the oil in the vacuum pump regularly. Then it's all about keeping the seals, doors, chambers, etc. clean. This is covered in detail in the AMARU Maintenance category on our blog, or you can watch our maintenance video on YouTube:
  • How to pack food after lyophilization?
    Preferably immediately after drying and without access to ambient air containing moisture. It does not have to be vacuum packed or packed in a protective atmosphere. For most of our customers, a sealing bag complete with a moisture absorber is sufficient.
  • Do you also produce a larger lyophilizer than AMARU?
    Not yet. However, AMARU is unique in that it is possible to stack 2 units on top of each other, double the capacity and save space.
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