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This European Standard specifies requirements and test methods for pressure sensing devices (PSDs) for the control of pressures of combustible gases of the first, second and third families, air, combustion products and mixtures thereof for operating pressures up to 5 bar. It covers all types of PSD including electronic, differential and inferential types. The requirements for 'S' class PSD are intended to meet the need for increased reliability for steam boilers. The methods of test given in this European Standard are intended for product type testing. Tests intended for production testing are not specifically included. This European Standard covers type testing only.