PREN 12952-11 : DRAFT 99

Foreword
1 Scope
2 Normative references
3 Definitions
  3.1 Limiter
  3.2 Fail-Safe
  3.3 Self-Monitoring
  3.4 Redundancy
  3.5 Diversity
4 Requirements for limiters
  4.1 General
  4.2 Materials and design
  4.3 Electrical equipment
  4.4 Fault assessment
5 Special requirements for water limiters
  5.1 Components
  5.2 Design
  5.3 Floating devices
  5.4 Level electrode devices
  5.5 Examination of functional capability
  5.6 Fault Detection
6 Special requirements for pressure limiters
  6.1 Components
  6.2 Additional requirements regarding 4.4 "Fault
      assessment"
  6.3 Design
  6.4 Electrical equipment
  6.5 Examination of functional capability
  6.6 Fault detection
7 Special requirements for temperature limiters
  7.1 Components
  7.2 Design
  7.3 Electrical equipment
  7.4 Examination of functional capability
Annex A (informative) Limiting safety devices
Annex B (informative) EC-Type examination plan
Annex C (informative) Marking of limiters
Annex ZA (informative) Clauses of this European
         Standard addressing essential or other
         provisions of the Pressure Equipment
         Directive

Provides requirements for limiting devices, and safety circuits of water-tube boilers as defined in EN 12952-1.