Electricity and Control April 2023

MEASUREMENT + INSTRUMENTATION

There are certain applications where pressure reducing valve failure would cause disastrous results. For exam ple, in the offtake from a high-pressure supply line into a low-pressure pipeline; and in place of break pressure tanks/reservoirs. Break pressure tanks are expensive and vulnerable to tampering/malfunction. They also need space on the surface which might not be easy to secure. □

ly used in these applications and most of them can handle a maximum of 4:1 pressure drop ratio. So, anything above a pump delivery pressure of 4 bar would need a pressure sustaining valve to handle this, in order to prevent cavitation. Here, a ratio reducing valve provides an ideal solution. If the pressure is anything up to 20 bar, a 5:1 valve can be installed upstream of the pressure sustaining valve. If the pressure is above 20 bar, two ratio reducing valves can be installed upstream. Pressure reducing stations for critical applications –

For more information visit: www.ultravalves.co.za

MEASUREMENT + INSTRUMENTATION : PRODUCTS + SERVICES

Non-stop transmission of sensor signals via fieldbus

The digital input modules expand ifm’s IO-Link master family.

Decentralised Digital Input (DI) modules from ifm serve as a gateway between binary sensors and the fieldbus. This means that binary switching signals in the field can be transmitted directly via the fieldbus using PROFINET, EtherNet/IP or Modbus TCP. No further transmission sys tems are needed in the fieldbus topology. The robust ifm modules are suitable for use in wide ranging environments, including demanding environ ments where washdown cleaning requirements must be met. The materials and production methods employed are identical to those used for the ifm jumper cables of the tried-and-tested EVC and EVF product series. The ecolink technology guarantees reliable, permanently ingress-resistant M12 connections of the connection cables. Key benefits The Ethernet modules extend ifm’s IO-Link master fami ly. They feature the same design, port configuration and standardised M12 connections.

The integrated high-frequency counter function can be activated via the PLC. The pulses transmitted by the sensor are counted within the module and are cyclically transmitted to the PLC as a counter packet. This ensures accurate counting that is not affected by the cycle time of the PLC. The Ethernet modules offer different

connection options for the voltage supply: an A-coded M12 connector with 1 x 4 A and an L-coded M12 connector with 2 x 16 A. The latter can be daisy-chained to other modules of the product family. For more information contact ifm South Africa. Tel: +27 (0)21 450 0400 E-mail: info.za@ifm.com Visit: www.ifm.com

APRIL 2023 Electricity + Control

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