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Burkert’s new 8201 pH system and 8285 transmitter have been chosen by Müller’s for the largest dairy in Europe, after 10-months of testing against a major competitor’s unit. At the conclusion of the tests only the 8201 pH system was shown to have met the demands of the continuous process; the enamelled stainless steel finish of its sensor still looking and measuring like it was new.

Whereas the competitive pH system needed to be cleaned and calibrated weekly - and also needed to be replaced during the 10- month testing period, Burkert’s 8201 pH system was only calibrated at the beginning of the tests and stayed in- process thereafter After 8 weeks, the customer checked the values of the electrode on the Burkert unit, but it did not require any adjustment. Even more surprising for Müller was the final measurement against the company’s reference laboratory pH standard using pH 1.08 hydrochloric acid; here again the 8201 proved itself superior.

As a result of the extended trials, Burkert’s new 8201 pH system is now being specified in Müller’s whey treatment process, where the whey undergoes ultra- and nano-filtration and reverse osmosis to get all the goodness out. The concentrate is dried and used in the production of yoghurt and many other food products. The pH measurement is necessary during the cleaning process of the filters; and in order to get an effective and short cleaning time the pH value on the one side has to be as low as possible; on the other side it must not fall below a minimum limit to avoid damaging the filter units. During nano-filtration the pH value has to be controlled precisely and must remain at pH=6.2. This value is regulated by adding acidic carbon dioxide to the whey.

Key to the superior performance of the Burkert 8201 pH system is a ‘fit-and-forget’ design that enables the measuring sensor to stay in process, even during CIP purification. This feature saves users both time and cost, by removing the requirement for sensor removal, cleaning and recalibration.                                   

In addition, the design also integrates a non-breakable sensor that obviates the problems of fracture with glass sensors; while its enamelled stainless steel finish provides the highest levels of non-stick performance for maximised hygiene whilst pH values are measured.

The hygienic design and robust, glass-free construction of the 8201pH sensor mean that the unit is particularly suitable for use in high- end hygienic processes; for example, in the production of foods and active ingredients where the pH value of liquid media - including those which are viscous or contain solids - is measured. The 8201 provides long service life in these processes and high levels of accuracy with its ability to measure absolute pH values between pH 0 and pH 12, at medium temperatures up to 140°C, and process pressures up to 6- bar. 


Easy to use, the 8201 pH sensor is a highly integrated device, operating as a single-rod measuring cell, with the measurement electrode and reference electrode combined in one element. The sensor probe is a stainless steel tube, which also houses a Pt 1000 for temperature compensation. It is coated with an ion-sensitive enamel layer, providing an extremely smooth surface that prevents media from sticking during measurement, making the sensor very easy to clean. Importantly during cleaning operations - and even, CIP purification, - the sensor stays in the process. This saves both time and costs and means that expensive fittings can be dispensed with.                                 

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For editorial enquiries contact Brett Davies, DMA Europa Ltd, 2nd Floor, Snuff Mill Warehouse, Park Lane, Bewdley, Worcs. DY12 2EL. Tel: 01299 – 405454 Fax: 01299 403092 E-mail: admin@dmaeuropa.com

For further information contact: Graham Oliver, Burkert Fluid Control Systems Brimscombe Port Business Park Brimscombe STROUD GL5 2QQ United Kingdom  Tel:  +44 (0)1453 731353 Fax:  +44 (0)1453 731343   E-mail: graham.oliver@burkert.com


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