The 4-20 mA current loop is an important aspect of process
measurement and control circuits. The important components that make up this
loop are:
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- The Sensor
- The Transmitter
- The Power Source
- The Loop itself
- The Receiver
The following diagram shows each component with its
function:
This is a simple illustration of a 4-20 mA current
Loop System.
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A 4-20mA current loop output or signal is a standard scale of testing and troubleshooting the industrial process control or monitoring devices like pressure transmitters, flowmeters, etc. The modern process parameter control instruments like Rosemount pressure transmitter work on highway addressable remote transducer i.e.; HART protocol. The circuit includes an electronic 2-wire system with 4-20mA current loop output. This scale is essential in examining the performance abilities of the pressure transmitters. Therefore, the testing and troubleshooting of a 4-20mA signal output must be learned by the operator.
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