Featuring two fully programmable relay contacts, the RTA 421 is best described as a low-cost combination of a contactor, display and power supply. Its compact housing has three pushbuttons for easy front-end configuration, with a liquid crystal display for simultaneously visible alarm set points and a ten segment bar-graph displaying the percentage value of the connected signal.
Loop power supply means that the RTA 421 is ideal for monitoring current (0,4 to 20 mA) or voltage (0,2 to 10 V) signals through connected sensors. Two independent output relays with changeover contacts are switched if values either exceed or undercut preset alarm setpoints, allowing hassle-free set point monitoring in applications ranging from plant and machine construction to panel builders, process monitoring and process control, enabling safer operation. Typical applications include temperature control and pressure switching, in conjunction with the relevant sensors also supplied by Endress+Hauser.
Grayhill achieves CANopen certification
Operator Interfaces, Switches & Relays
Grayhill has achieved official CANopen certification from CAN in Automation for its Touch Encoder T1 series, giving designers a standards-based communication option for integrating touch encoder controls into CAN-based automotive and industrial systems.
Read more...Why measurement matters in smelting Endress+Hauser South Africa
Analytical Instrumentation & Environmental Monitoring
South African smelters returning to operation after energy constraints face new demands for tighter control, better visibility and environmental compliance. Endress+Hauser explains how modern measurement technology supports safer, more efficient furnace operation and local beneficiation.
Read more...Inspiration for times of change Endress+Hauser South Africa
News
More than 2000 customers, partners and experts gathered in Basel, Switzerland, for the Endress+Hauser Global Forum in April 2026. Under the theme of driving sustainable transformation together, the event combined keynote sessions on strategy, technology and the future of work with practical case studies from across the process industry.
Read more...Optimise sludge treatment and reduce operational costs Endress+Hauser South Africa
Sensors & Transducers
Endress+Hauser’s inline measuring devices, the Proline Teqwave MW 300 and the Proline Teqwave MW 500, determine the total solids content of wastewater directly through microwave transmission.
Read more...Level measurement for hygienic applications Endress+Hauser South Africa
Level Measurement & Control
Endress+Hauser’s Liquiphant is considered to be the most reliable and safe point level detector in industrial plants. The latest generation of devices is ready for Industry 4.0 and, with the Liquiphant FTL63, is ideally suited for applications with hygienic requirements.
Read more...Monitoring relays keep operations running Omron Electronics
Operator Interfaces, Switches & Relays
OMRON’s K8 series relays are designed to prevent breakdowns, protect critical assets and support smarter maintenance strategies on the plant.
Read more...Transforming the process industry through digitalisation Endress+Hauser South Africa
IT in Manufacturing
By connecting field devices, systems and people, digitalisation creates new opportunities to optimise operations, enhance maintenance strategies and support continuous improvement. As a leading instrumentation provider and major source of process data, Endress+Hauser plays a key role in enabling this transformation.
Read more...Verification using Heartbeat Technology is a breeze Endress+Hauser South Africa
Sensors & Transducers
Heartbeat Technology reflects Endress+Hauser’s long-term commitment to enhancing measurement reliability and efficiency across a growing product portfolio.
Read more...Elevating analogue signal processing Endress+Hauser South Africa
Editor's Choice
The RN Series from Endress+Hauser is a powerful and relevant solution for analogue signal processing and conditioning.
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