current loop

Difference between 2 wire & 4 wire transmitter current loops

Instrumentation

The current loop uses DC power because the magnitude of the current represents the signal level that is being transmitted. If AC power was instead used in the loop, the magnitude of current would be continuously changing, making it difficult to discern the signal level being transmitted.In this session we are gonna discuss about Difference between …

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What is a 4-20 mA Current Loop?

Instrumentation

Introduction Before the age of electronic circuitry the whole process is controlled by mechanically.Facilities used pneumatic control signals where controllers were powered by varying pressures of compressed air.The 3 -15psi standard became the standard.Easier to differentiate a live zero (3 psi) signal from a failure in the system (0 psi).In the 1950s, as electronic systems became …

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