BS EN 12953-9:2007 – Shell boilers — Part 9: Requirements for limiting devices of the boiler and accessories
1 Scope
This European Standard specifies requirements for limiters (or limiting devices) which are incorporated into safety systems for shell boilers as defined in EN 1 2953-1 .
A limiter (or limiting device) can be either:
a safety accessory as defined in the Pressure Equipment Directive, Article 1 , clause 2.1 .3, and needs to include the safety logic and final actuator, or
one element of a safety system, for example, a self-monitoring water level sensor used as part of a safety accessory as defined in the Pressure Equipment Directive, Article 1 , clause 2.1 .3. The overall boiler protection function needs to be provided in association with additional safety logic (where appropriate)
and a final actuator.
The design requirements and examination of functional capability for the limiters are covered in this European Standard.
For an explanation of the extent of the limiter (or limiting device) see Figure A.1 .
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 298:2003, Automatic gas burner control systems for gas burners and gas burning appliances with or without fans
EN 501 56-1 :2004, Electrical equipment for furnaces and ancillary equipment — Part 1: Requirements for application design and installation
EN 60529:1 991 , Degrees of protection provided by enclosures (IP code) (IEC 60529:1989)
EN 60664-1 :2003, Insulation coordination for equipment within low-voltage systems — Part 1: Principles,requirements and tests (IEC 60664-1:1992 + A1:2000 + A2:2002)
EN 60730-1 :2000, Automatic electrical controls for household and similar use — Part 1: General requirements (IEC 60730-1:1999, modified)
EN 61 000-4-2:1 995, Electromagnetic compatibility (EMC) — Part 4: Testing and measurement techniques — Section 2: Electrostatic discharge immunity test — Basic EMC publication (IEC 61000-4-2:1995)
EN 61 000-4-3:2006, Electromagnetic compatibility (EMC) — Part 4-3: Testing and measurement techniques — Radiated, radio-frequency, electromagnetic field immunity test (IEC 61000-4-3:2006)
EN 61 000-4-4:2004, Electromagnetic compatibility (EMC) — Part 4-4: Testing and measurement techniques — Electrical fast transient/burst immunity test (IEC 61000-4-4:2004)
EN 61 000-4-5:2006, Electromagnetic compatibility (EMC) — Part 4: Testing and measurement techniques — Section 5: Surge immunity test (IEC 61000-4-5:2005)
EN 61 000-4-6:1 996, Electromagnetic compatibility (EMC) — Part 4: Testing and measurement techniques — Section 6: Immunity to conducted disturbances, induced by radio-frequency fields (IEC 61000-4-6:1996)
EN 61 000-4-8:1 993, Electromagnetic compatibility (EMC) — Part 4: Testing and measurement techniques — Section 8: Power frequency magnetic field immunity test; basic EMC publication (IEC 61000-4-8:1993)
BS EN 12953-9:2007 – Shell boilers — Part 9: Requirements for limiting devices of the boiler and accessories