Glossary Updates12 new terms added to the glossaries · October 2, 2026, 22:44 CEST
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Glossary · Protective devices and interlocks

Electro-sensitive protective equipment (ESPE)

Also known as: ESPE

In machine safety, electro-sensitive protective equipment (ESPE) is protective equipment that detects persons by optical, capacitive, ultrasonic or other non-contact means and initiates a protective response in the machine control.

  • Machine safety
  • EU

In one sentence

ESPE such as light curtains and laser scanners detects people without contact; IEC 61496 sets product requirements and the application sets the distance.

Example

An AGV carries a safety laser scanner as ESPE; when a person enters the protective field, the vehicle's safety controller brakes it to standstill.

How it applies

  • Machine safety: ESPE allows access without opening a guard, which suits frequent loading and material flow. It cannot hold back ejected parts or fluids, and it only protects if the machine stops before the person reaches the hazard (minimum distance).
  • Standards: IEC 61496 defines requirements for the equipment itself and uses types to express its fault behavior. The positioning follows ISO 13855.
  • Functional safety: The ESPE is the input of a safety function. Its type and data feed into the Performance Level or SIL of the whole function.
  • Technical documentation: Describe the detection zone, resolution, response time, reset behavior and test procedure. Include restrictions of use, for example environmental conditions that affect detection.

ESPE vs. presence-sensing device

ESPE is the IEC term for non-contact equipment. Presence-sensing device is used mainly in US practice and can include contact-based devices such as mats.

By knowledge.aitechdoc.world · Published September 25, 2026 · Last reviewed

Source: IEC 61496 series, Safety of machinery — Electro-sensitive protective equipment

Definitions follow the cited standards and specifications. Where a source is a copyrighted publication, such as an ISO, IEC or EN standard, the definition is a close paraphrase, not a verbatim quotation, so as not to infringe copyright. We recommend reading the original publication. The sections “How it applies” are editorial commentary by AI TechDoc Knowledge and are not part of any standard.

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