Summary

Durante a produção de produtos lácteos, o leite cru transita entre processos sucessivos através de tubagem em aço inoxidável. Válvulas de controlo rotativas mantêm as sequências do processo corretamente, garantindo que nenhuma contaminação cruzada ocorre durante o processo de limpeza CIP após cada lote ser terminado. Sensores indutivos Washdown robustos, montados em atuadores rotativos existentes, monitorizam o estado de controlo da válvula permanentemente, disponibilizando realimentação posicional em tempo real ao sistema de controlo global da fábrica num modo simples e económico.

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Valor acrescentado para o cliente

  • Operação segura e fiável num ambiente de lavagens hostil
  • Sem risco de contaminação cruzada entre as sequências do processo e da limpeza
  • Fácil integração com o sistema de controlo global da fábrica
  • Solução económica requerendo manutenção mínima

Vantagens específicas do produto

  • Sensor para lavagens robusto com proteção IP68 e IP69K
  • Resistência excecional aos choques e vibrações
  • Sensor de alto-desempenho competitivo com excelente fiabilidade

Customer Application

At a European dairy-processing plant, milk products, made from pasteurized or raw milk, require hygienic transportation between successive operations. Process engineers use stainless-steel pipework to transport liquid ingredients from one operation to the next. Fluid flow is managed using control valves fitted with electrical, hydraulic or pneumatic actuators.

Multiple rotary-shaft valves deliver raw milk from holding tanks to each process station in sequence, maintaining specified flow rates and volumetric limits. Once processing of each batch is completed and all process vessels are drained, closed-loop CIP cleaning commences. Accurate, repeatable valve sequencing is essential to prevent any chance of cross-contamination between processing and cleaning sequences.

A robust, highly reliable sensor system, capable of withstanding the harsh washdown regimes in force, is needed to monitor control-valve positions during processing. Where possible, sensors must be mounted on existing rotary actuators, and real-time communication with existing plant-wide control systems is mandatory.

Customer Solution

Sensing the position of a rotary-valve actuator is a routine task for Contrinex Classics washdown inductive sensors. These sensors interface directly with a range of industrial process controllers and provide cost-effective confirmation of control-valve status around the clock.

A purpose-designed bracket, mounted on the top surface of each actuator, holds two sensors; these are positioned with the sensing faces vertically aligned, one above the other, and facing the actuator shaft. NAMUR-compatible (VDE/VDI 3845) mountings on the actuators provide a known datum for the sensors.

A solid plastic disc, mounted on the shaft, carries two or more stainless-steel targets, positioned at 90 degrees to each other around the outer peripheral surface of the disc. Each target occupies either an upper or a lower position corresponding to height of one of the sensors. As the shaft rotates, opening and closing the valve, the targets pass in front of the sensing faces, triggering the sensors.

These M12-diameter devices, rated to IP68/IP69K, have all-metal bodies with PBTB sensing faces and vacuum-encapsulated electronics; each features an industry-standard PNP normally open output. Fully embeddable, and with a sensing range up to 2mm, they are well suited to the hostile operating conditions of a washdown environment.

Each sensor has an integral M12 connector, interfacing with the customer’s control system via a TPE-S-sheathed cable. Reliability is excellent; the system is simple and cost-effective.