SNZ - AS/NZS 4024.2804
Safety of machinery Part 2804: Safety-related sensors used for the protection of persons
|Publication Date:||20 August 2021|
This Technical Specification gives requirements for the development and integration of safety related sensors (SRS) and safety related sensor systems (SRSS) used for protection of persons with special attention to systematic capabilities.
This generic standard only applies if
- protection of persons is to be performed by using sensors, and
- standards for functional safety of electrical control systems address sensor(s) as subsystem or subsystem element, and
- product specific sensor standards (e.g. IEC 61496 (all parts), IEC 60947-5-2) do not contain all necessary provisions, or product specific sensor standards are not developed.
The approach of examination of systematic capabilities by using different safety related sensor standards is described in Annex A.
The requirements and methods within this document are limited to the purpose of protection of persons
- by detection of potentially hazardous objects,
- by detection of a body, parts of a body and objects associated to parts of a body entering a hazardous area, or
- by classification respective discrimination of these against other objects.
NOTE 1 Application of SRS/SRSS in public can require detecting not only of persons, but also their associated equipment, for example wheelchairs, walking sticks or infusion stands.
Performance classes of sensors and sensor systems are defined in accordance with existing functional safety standards (e.g. IEC 62061, IEC 61508 (all parts), and ISO 13849 (all parts)).
NOTE 2 T here will be no definitions of or interconnections to the types as defined in IEC 61496-1 within this document to simplify and prevent misuse. Simplification for end users is achieved by correlation to existing PL, SIL or SILcl.
Special attention is given to the sensing function and dependability of the detection capability. Environmental influences and tests for indoor and outdoor use are defined which influence the sensing function and dependability of the detection capability.
NOTE 3 Environmental influences, their classification and test procedures are primarily specified in accordance with generic environmental standards. More specific requirements and tests are only described in absence of respective standards.
This document can be relevant to applications other than those for the protection of persons in industries, for example, for the protection of persons in public like agriculture or metro stations.
This document does not consider and address proven in use (e.g. processes or elements) as done in IEC 61508-2.