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Conversión rápida en un espacio limitado

Wilhelm Niemann Maschinenfabrik garantiza el funcionamiento confiable de sus máquinas con soluciones de protección Ex seguras y eficientes de Turck, que incluyen sensores precisos y dispositivos de interfaz compactos rápidos

Wilhelm Niemann Maschinenfabrik es una compañía que fabrica mezcladores y molinos para la industria de pinturas, barnices y químicos. Los clientes los usan casi exclusivamente en áreas de explosión peligrosa. El fabricante con sede en Melle instala amplificadores de conmutación aislantes de ahorro de espacio y amplificadores de medición de temperatura de la serie de interfaces IMX12 de Turck en el gabinete de control. Estos envían las señales de los botones del operador al campo y transfieren señales de entrada digitales y analógicas intrínsecamente seguras. Niemann también se ha basado durante muchos años en los amplificadores de potenciómetro IM36 para colocar la altura de los discos dentados. Los iniciadores inductivos de Turck con una salida Namur han sido incluso más tiempo en uso, y pudieron impresionar a Niemann debido a sus grandes distancias de conmutación.

  • Niemann equips its machines, like this Kreis dissolver with sensors and interface technology from Turck

  • IMX12 and IM36 amplifiers guarantee safe signal transmission in the Ex environment

  • The power bridge system simplifies the power supply of the IMX12 devices

  • Inductive proximity switches in the machine column query the height of the hydraulic ram

  • Compact BIM-UNT magnetic field sensors are concealed in the fill openings

  • During the production process a double suction disc in the container rotates at the set height

  • Hendrik Werges, workshop and project manager for electrical engineering at Niemann

Streamlined protection

Niemann produces three basic machine types, the dissolver, the basket mill and the “Butterfly” Kreis dissolver. One thing is common to all machines here – their use in explosion hazardous areas. This must also be taken into account in the control cabinet outside of Zone 1. Encapsulated Profinet or Profibus cables can be run from the PLC in the control cabinet to an operating element. 

The second variant without PLC technology requires hard wiring. This sends signals from the operator button to the field via IMX12 isolating switching amplifiers from Turck. Devices from the IMX12 interface series are also used if users wish to pass certain digital or analog values from the Ex area. Turck's IMX12 devices were chosen thanks to their narrow width of only 12.5 millimeters, but also due to their power supply via a power bridge.

Three environments, three initiators

Niemann had been using Turck sensor technology for a long time before the interface technology devices. For example, the technicians at Niemann install M18 inductive proximity switches in the columns of its machines in order to query heights. The sensor must detect the cylinder and ring in spite of the distance. This demonstrates the benefit of Turck's NI10-G18 proximity switches. 

Anyone wanting to look for the smallest Turck components in a Niemann machine must look really closely. With a housing length of 31 millimeters and a height of six millimeters, the BIM-UNT-AY1X magnetic field sensor is hidden in the cover hinge of a tank fill opening. This detects here whether the cover is open or closed. In addition, a specially designed inductive sensor must withstand wear in the drive. This scans a switch lug in the very demanding atmosphere.

IM36 passes speed test

The position of the toothed disc inside the container is determined by a cable sensor. This supplies resistance values via the contact of the measuring cable, which have to be supplied as analog values. A potentiometer amplifier converts this quickly to an intrinsically safe 4-20 mA value so that connected systems can regulate the height steadily. The process sometimes still caused problems five years ago. 

“If the conversion takes too long, the machine misses crucial points by a few centimeters and then continuously oscillates”, explains Hendrik Werges, workshop and project manager for electrical engineering. A transducer with a cycle time of less than 700 milliseconds was required as a solution. Niemann therefore turned at that time to Turck interface technology. To be precise, the IM36 amplifier, which completes a conversion within 30 milliseconds and thus enables the toothed disc to be positioned within the hysteresis range.

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