Why Use a Current Loop?
A Little Bit of History Before the advent of electronic circuitry, process control was a wholly mechanical endeavor. Facilities used pneumatic control signals where controllers were powered by varying pressures...
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Basics of 4 to 20 mA analog Signals
The most popular form of signal transmission used in modern industrial instrumentation systems is the 4 to 20 milliamp DC standard. This is an analog signal standard, meaning that the...