Material selection cannot be made simply based on generic terms like 'acid' or 'alkali.' Sizing requires confirming chemical composition, concentration, temperature, pressure, and the presence of impurities or mixed media, followed by assessing the suitability of 316L, Hastelloy, Tantalum, Titanium, or PTFE. For highly corrosive, viscous, or crystallizing media, diaphragm seal systems may be required to isolate the sensing element from the process medium. FRD offers a broad range of specialized wetted alloys and remote diaphragm solutions.

Beyond pressure ranges and process media, one must confirm hazardous area zoning, gas or dust atmosphere classifications, required explosion protection methods, temperature classes, and installation site requirements. Suitability cannot be judged solely by whether a vendor claims 'ATEX certified' or 'IECEx certified'; specific product model designations, certificates, and certified operating parameters must be verified. The IECEx scheme issues Certificates of Conformity based on third-party accredited laboratory testing and ongoing quality surveillance of specific apparatus.

When media exhibit high viscosity, polymerize, crystallize, carry suspended solids, operate at elevated temperatures, or are aggressively corrosive, standard impulse ports and piping are prone to clogging, corrosion, or severe maintenance burdens. In such scenarios, flush diaphragm or remote capillary diaphragm seal systems should be evaluated. For storage tank level and differential pressure measurements, single-flange or double-flange remote configurations can be selected based on installation conditions.

No. Hazardous area instrumentation must precisely match the actual zone classification, protection concept, gas/dust group, temperature class, and local installation standards. The specific certificate scope of the selected model must fully cover the actual operating conditions. The official IECEx system emphasizes third-party conformity assessment for specific apparatus and standards, while engineering installation, selection, and subsequent maintenance are governed by the relevant standards within the IEC 60079 series.