Abstract
An electronic flow transmitter with square root extraction, the output of which is directly proportional to the flow, has such features as suitability for flow measurement of large turn down and easy applicability to flow signal computation. As this type of force balance system has a nonlinear element in its feedback path, there are more difficult problems in the design of flow transmitters than that of the conventional differential pressure transmitter. Initially presented in this paper are some points to be considered at the time of design, where special empasis is placed on the effects of the nonlinearity upon the overall characteristics and some methods to improve both static and dynamic characteristics are discussed. Finally given are the fundamental equations and a typical design procedure of the electromagnet system which is a feedback element acting as a squaring device and is one of the most important components in this transmitter.
