This part of IEC 61326 covers all equipment within the scope of IEC 61326-1, but is limited to systems and equipment for industrial applications within a specified electromagnetic environment and intended to perform safety functions as defined in IEC 61508 with SIL 1-3. The electromagnetic environments encompassed by this product family standard are industrial, both indoor and outdoor, and based on the requirements of the process industry, specifically chemical/petrochemical/pharmaceutical manufacturing plants using the mitigation measures given in Annex C. The difference between the electromagnetic environment covered by this standard compared to the general industrial environment (see IEC 61326-3-1) is due to the mitigation measures employed against electromagnetic phenomena leading to a specified electromagnetic environment with test values that have been proven in practice. The environment of industrial application with a specified electromagnetic environment typically includes the following characteristics: industrial area with limited access; limited use of mobile transmitters; dedicated cables for power supply and control, signal or communication lines; separation between power supply and control, signal or communication cables; factory building mostly consisting of metal construction; overvoltage/lightning protection by appropriate measures (for example, metal construction of the building or use of protection devices); pipe heating systems driven by a.c. main power; no high-voltage substation close to sensitive areas; presence of CISPR 11 Group 2 ISM equipment using ISM frequencies only with low power; competent staff; periodical maintenance of equipment and systems; mounting and installation guidelines for equipment and systems. Equipment and systems considered as proven-in-use according to IEC 61508 or prior use according to IEC 61511 are excluded from the scope of IEC 61326-3-2. Fire alarm systems and security alarm systems intended for protection of buildings are excluded from the scope of IEC 61326-3-2.