4 -20 ma

How to Troubleshooting  4 -20 mA Current Loops with Loop Calibrator?

Introduction Special-purpose electronic test instruments called loop calibrators are manufactured for the express purpose of 4-20 mA current loop circuit troubleshooting. These versatile instruments are generally capable of not only measuring current, but also sourcing current to unpowered devices in a loop, and also simulating the operation of loop-powered 4-20 mA transmitters. A very popular loop calibrator unit is the Altek …

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What is a 4-20 mA Current Loop?

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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