上海充通大学 SHANGHAI JIAO TONG UNIVERSITY 2.1 Functional Elements of an Instrument Measured Quantity Measured Primary Medium Sensing (Energy) Element It first receives energy from the measured medium and produces an output depending in some way on the measured quantity ("measurand") Functional Elements in an Instrument 上游文通大学 SHANGHAI JIAO TONG UNIVERSITY 2.1 Functional Elements of an Instrument Measured Quantity Measured Primary Variable Medium Sensing Conversion (Energy) Element Element For instrument to perform the desired function,this element converses the physical variable from the Primary Sensing Element to a more suitable variable while preserving the information content. Functional Elements in an Instrument2.1 Functional Elements of an Instrument Measured Quantity Primary Sensing Element Measured Medium (Energy) Functional Elements in an Instrument It first receives energy from the measured medium and produces an output depending in some way on the measured quantity (“measurand”) 2.1 Functional Elements of an Instrument Variable Conversion Element Functional Elements in an Instrument Measured Quantity Primary Sensing Element Measured Medium (Energy) For instrument to perform the desired function, this element converses the physical variable from the Primary Sensing Element to a more suitable variable while preserving the information content