4–20 mA Process Control Loops
In electrical signalling an analog current loop is used where a device must be monitored or controlled remotely over a pair of conductors. Only one current level can be present
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How-to Create Instrument Loop Diagram (ILD) ?
How to create a instrumentation loop drawing, say for instrument air vessel ? Piping and Instrumentation (P&ID) diagram shows the several instrumentation loops connected with particular equipment. P&ID shows signal path