Specification Forms forProcess Measurement andControl Instruments, PrimaryElements, and Control ValvesApproved 30 October 1981ISA–20–1981 Formerly ISA–S20–1981STANDARDISA The Instrumentation,Systems, andAutomation Society –TMCopyright International Society of Automation Provided by IHS under license with ISA Licensee=University of Alberta/5966844001, User=wang, geNot for Resale, 02/07/2015 17:58:29 MST No reproduction or networking permitted without license from IHS--`,````,`,,`,`,`,````,`,,,``,-`-`,,...
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