Level measurements can present challenging problems. First, the properties from which the level can be inferred usually vary. Further, mechanical and electrical complications exist, such as swirling, swishing, and frothing at the top layer. No single level sensor fits all applications. Every level measurement situation must be evaluated separately. The design engineer must consider the metallurgy and configuration of the vessel, the temperature and pressure ranges, the chemical and physical characteristics of the liquid, the nature of the agitation, the electrical area classification, maintenance practices, and perhaps other factors.
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