Electricity and Control June 2024

Simple flow switch for water, oils, gases and more “Senseca recently introduced the FF type series flow switch which has applications specifically in the water, oils, gas, food and beverage sectors as well as in general industry where pump protection is required. Its 200-bar pressure and piston valve seat design make it a unique flow switch for various industry applications,” says Jan Grobler, Managing Director of Senseca South Africa. The simple mechanical operating principle of the pis ton valve seat design makes it space-saving and means the flow meter can be installed economically for high unit counts. The meter is practically maintenance free across all applications. In operation, the flow volume raises a piston (fitted with a magnet) out from a valve seat against a spring force. The stroke causes a change in the magnetic field, where a her metically isolated Reed switch is actuated and an electrical signal is generated. With spring-assisted stabilisation of the piston, the flow meter can be installed in all positions. The vertical positioning of the Reed switch adjusted at the factory enables recognition of flow rates from about 2% to 60% of the recommended maximum volume. Grobler says the Senseca FF Flow Switch offers the largest switching value selection and the widest housing spectrum with a valve seat design. It is a cost effective and low maintenance flow switch which delivers effective sys tem safety. The FF series includes housing sizes for nominal pipe widths from DN8 to DN50 and freely selectable switching values from 0.41 l/m. The swift reaction times of less than 100 ms ensure rapid actuation time for applications. An ad ditional feature is the high switching value repeat accuracy with a minimal pressure loss of less than 0.1 bar. “The FF series of flow switches suit high-pressure clean ing technology applications as they are available in various housing sizes – and they can be used in any sector where water, oils and gas are processed,” Grobler adds. “They offer high efficiency and provide a tamper-proof switching value, offering high system safety,” he says. When applied in process water in industrial systems, contamination situations often arise due to sediments and other ordinary content in the water. Here, the filtration is a recommended design feature. The FF flow switch enables horizontal flow through the housing where the vertical func tional design is highly resistant to water contaminants. This supports the filtration efficiency of the overall system, de livering enhanced safety and functional reliability in such applications. The flow switch FF can be ordered to meet customers’ specific requirements. There is no switching value drift with the FF flow monitor, an advantage in flow monitoring for heat exchangers in cleaning technology applications with hot water systems. “We adjust the flow switch to meet specified require ments,” Grobler says. □

Ultrasonic flowmeters – Comprehensive portfolio for gases, liquids and steam • Accuracy and reproducibility regardless of medium properties such as viscosity, temperature, density and electrical conductivity • Self and process diagnostics (acc. NAMUR NE107), excellent long-term stability, large dynamic range, bi-directional measurement • DN25...3000 / 1…120“, –200…+600 °C / –328…+1112 °F, up to 490 bar / 7107 psi From process and utility applications to custody transfer and energy measurement

More information about Ultrasonic flowmeters: krohne.link/ultrasonic-za

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JUNE 2024 Electricity + Control

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