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The loop-powered instrument concept

The loop-powered instrument concept

Reducing complexity with standardized field instrumentation

Selection of measuring technology is becoming increasingly complex due to the broad range of measuring tasks to be performed and the wide array of instrument families and manufacturers to choose from. At the same time, operational safety and plant availability requirements are becoming ever more strict. As a result, there are growing calls for uniformity as indicated in NAMUR Recommendation NE 131 (NAMUR standard device).

The new loop-powered (two-wire) instrument concept offers unparalleled uniformity across the following instrument components:


The concept is based on an array of standards which will govern all new Endress+Hauser instrument concepts going forward. They enable a conceptual shift towards simplicity through uniformity across the entire product portfolio, delivering lasting benefits throughout the entire life cycle of field devices.


  • Intuitive, uniform operation: Removes complexity and cuts the cost of training, commissioning, maintenance and operation. Automatic data backup enables easy replacement of electronics without recalibration.

  • Modular instrument concept for spare parts and components: Inventory costs go down thanks to fewer in-stock replacement components, while plant availability goes up owing to the flexible interchangeability of component parts.

  • Seamless system integration: Less engineering work and harmonized software version management ensure stable plant operation.

  • Uniform Ex concept for maximum safety and ultimate flexibility in applications around the world. The systematic implementation of relevant industry standards guarantees a high level of operational safety.

  • A fast decision-making aid in the event of an error, in accordance with NE 107, prevents or shortens plant downtime.