DESCRIPTION The FT75 Laboratory Pasteuriser accurately reproduces in miniature the industrial high temperature, short time process (HTST). Nominal throughput is only 10 litres/hour. Although primarily designed for use with milk, other food liquids can be pasteurised providing that their solids content is not too high. Pasteurising temperatures and holding times are easily adjusted, enabling the effectiveness of the product treatment to be investigated. When correctly operated, cleaned and sterilised the FT75 can produce a correctly treated and pasteurised product. However it is not intended that this apparatus be used to manufacture products for human consumption. The HTST process involves heating the process liquid (milk) to a minimum temperature of 72°C, holding this temperature for 15 seconds and cooling to a storage temperature as quickly as possible. The three-stage plate heat exchanger of the FT75 (ffg. 1) achieves these parameters by (1) heating the process liquid with hot water prior to its entry into the holding tube and then by (3) cooling with cold water to storage temperature. An intermediate heat exchanger (2) transfers heat from the treated product to the feed liquid. This provides dual beneffts in reducing the energy required to reach the pasteurising temperature and in reducing the cooling required. An optional CW17 Chilled Water Circulator is available. Full instrumentation and controls are provided to regulate heating water temperature and also feed pump speed, which in turn regulates holding time. Optional computer linkage is available to control the process and to log production data. A user instruction manual provides installation, commissioning and maintenance data together with project exercises. For secondary/high school use, a full set of worksheets and simple explanations is available on request.
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