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4-20 mA Current Loops Overview. The 4-20 mA current loop is the prevailing process control signal in many industries. It is an ideal method of transferring process information because current does not change as it travels from transmitter to receiver. It is also much simpler and cost effective.
4-20mA Current loops are widely used to transmit process variable data such as temperature, pressure, flow rate, level, consistency, speed, etc between the process controllers and the field devices. Transmitters convert these process signals to 4-20mA DC for the purpose of transmitting the signal.
23 paź 2024 · The 4-20mA current loop has been the standard for analog signal transmission in the industrial environment for more than 70 years and, judging by number of transducers that support it today, will be around for a bit longer yet!
A major application of current loops is the industry de facto standard 4–20 mA current loop for process control applications, where they are extensively used to carry signals from process instrumentation to proportional–integral–derivative (PID) controllers, supervisory control and data acquisition (SCADA) systems, and programmable logic ...
2 gru 2020 · The 4-20 mA current loop has become the standard for signal transmission and electronic control in most analog control systems. A 4-20mA current loop circuit is shown in Figure 1.
4…20 mA current is commonly used to connect process signals to a controller in industrial applications. The principle of using a 4-20 mA loop is that a process range e.g. 0-100 degrees is reflected by a corresponding 4-20 mA range for easy interfacing with connected equipment.
28 cze 2024 · The transducer regulates the flow of current through the wires at 4 to 20 mA, where 4 mA represents a live zero and 20 mA represents the maximum signal. A 0 mA signal signifies a break in the loop. The data acquisition device measures the regulated current flow.
