This European Standard provides for security grades 1 to 4, (see EN 50131-1) specific or non-specific wired or wire-free opening contacts (magnetic), and includes the requirements for four environmental classes covering applications in internal and outdoor locations as specified in EN 50130-5. A detector shall fulfil all the requirements of the specified grade. Functions additional to the mandatory functions specified in this European Standard may be included in the detector, providing they do not influence the correct operation of the mandatory functions. The two separate parts of the opening contact (magnetic) shall be referred to in the body of this European Standard as the detector. This European Standard does not apply to system interconnections.