NOSHOK

A: The ASME B40.100 (formerly ASME B40.1) and EN 837-1 are both standards for pressure gauges, but they serve different regions and regulatory frameworks. ASME B40.100 is the U.S. standard for dial-type, elastic-element pressure gauges, providing guidelines for design, accuracy, performance, and testing. Primarily used in North America, it includes similar technical requirements to EN 837-1 within a mandatory appendix. EN 837-1, on the other hand, is the European standard specifically for Bourdon tube pressure gauges, enforcing strict requirements for dimensions, metrology, and testing to ensure compliance within the European Union. While both standards cover similar aspects of pressure gauge design and performance, EN 837-1 is a regulatory requirement for products sold in Europe, often necessary for CE marking, whereas ASME B40.100 serves as an industry guideline aligned with ANSI-approved U.S. standards. A: A diaphragm is used to isolate and protect the instrument from the process media. Damaging process media may include corrosives, particulates, temperatures, or any state that is not suitable for direct contact with the measuring element. Diaphragms indirectly transmit system p