Electricity and Control March 2023


The hygienic solution to pressure surges in plants

Valve specialist GEMÜ, which is based in Ingelfingen, Germany, and operates internationally through a network of commercial partners, has developed the GEMÜ 652 pulsation damper. Based on the company’s tried and tested diaphragm valve technology, it is also suitable for use in sterile applications. This means it is complete ly drainable and CIP/SIP capable, taking the specified draining angle into account. In many production plants, unwanted pressure surges arise, generated by switching on pumps, by tempera ture changes in enclosed liquids or by quickly switching valves, for example. Opening valves can also result in pressure surges if the media supply is at a high level and the fluid column to lower plant components sudden ly starts moving. Such pressure surges can damage plant components such as filters, sensors, pumps and piping. Likewise, the pressure surges can result in shut-off valves briefly opening inadvertently. This, in turn, can result in possible contamination of the medium. In the worst case, it can result in downtime due to repair work being required, or a loss of product. GEMÜ has introduced the GEMÜ 652 pulsation damp er as a solution to this problem. The unit is designed to When sourcing instrumentation to supply a complete solution to meet a client’s requirements, sometimes the optimum response comes from collaboration between companies within the same group. Martens and Val. Co, both members of the GHM Messtechnik Group of companies, do this with their temperature measurement transducers and temperature probes. Jan Grobler, Managing Director of GHM Messtechnik South Africa said, “The MU125 Temperature Measuring Transducer from Martens can integrate the Val.Co Thermo VST Temperature Probe into its functionality. The shared technical expertise from both companies enables us at GHM to customise instrumentation to a client’s specific requirements and to ensure the instrument delivers high-quality performance at a cost-effective level. The transducer and probe are suitable for use across all industries where temperature measurement is required,” he said. The Martens MU125 converts a temperature meas urement value or resistance measurement value from various sensors to a current signal of 4...20 mA. The uni versal configurability of the measuring inputs reduces the stock requirement for various applications. It has a universal input for PT100, PT1000, thermocou ple, NTC and resistance measurement value. The zero point and limit value can be adjusted via trim potentiom eters on the front. The housing width of 12.5 mm enables space saving in the switch cabinet. Intra-group collaboration delivers the solution

open up as much volume as possible in a given operat ing range and thus absorb and compensate for the pres sure surge. A sealing weir is not included in the body, so the damper is not suitable for shutting off media. The ex pansion volume is opened up by the moving diaphragm. By using different actuator sizes and spring sets, it is possible to adjust the operating range and the volume that can be compensated for. Increased expansion volume can be achieved by installing multiple pulsa tion dampers in series. The control air connector is used only for assembly. Actuation via control air is not required for operation, as its function is accomplished solely using spring force. The GEMÜ 652 pulsation damper is available in the nominal sizes DN 15 to DN 80 (diaphragm size 25 to 80). To ensure flexibility for different applications, the valve bodies and diaphragms are available in various materi als and designs. Due to the diaphragm valve technology used, the product complies with the current standards in the foodstuffs and pharmaceutical industries, such as BSE/TSE, FDA, USP Class VI and Regulation (EC) no. 1935/2004.

The GEMÜ 652 pulsation damper.

For more information visit: www.gemu-group.com

Val.Co’s compatible Thermo VST Temperature Probe offers temper ature sensors in compact form for simple and efficient control, measure ment and monitoring of temperature in industrial and OEM applications. The Thermo VST Temperature Probe is easy to install, compact and rugged. It has a maximum operating pressure of 50 bar and, as a mini mum, an IP65 protection rating. The temperature probe is available with sensors PT100, PT1000, PTC and NTC. “The intra-group collaboration on interconnecting technologies offers

The Val.Co Thermo VST Temperature Probe can be integrated into the MU125 Temperature Measuring Transducer from Martens to deliver an optimum measurement solution.

all the advantages that would be expected from a single source of supply in terms of technical support and ser vicing. The GHM Group of companies is well known for its Centres of Excellence and technical innovation, and it makes sense for customers to benefit from the com panies’ technical collaboration, delivered to the German standard of high-quality instrumentation associated with our group of companies” Grobler said. For more information contact Messtechnik SA. Tel: +27 (0)11 902 0158 Email: info@ghm-sa.co.za

MARCH 2023 Electricity + Control


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