Αποτελέσματα Αναζήτησης
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.
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.
2 Δεκ 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.
Basics of 4-20mA Current Loop. Figure 1 shows a schematic of the simplest 4-20 mA current loop. There are mainly four components: A DC power supply; A 2-wire transmitter; A receiver resistor that converts the current signal to a voltage; The wire that interconnects it.
28 Ιουν 2024 · Current Loop System. The DC power supply provides the power to the system. 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.
To understand, what is the 4-20 mA current loop? we need to first understand a simple circuit shown below, which is working on ohm’s law. Ohm’s law saying that voltage(V) is equal to the current(I) multiplied by the resistance(R).
The 4-20mA current loop is a very robust and popular sensor signalling standard. Current loops are ideal for data transmission because of their inherent insensitivity to electrical noise. In a 4-20mA current loop, all the signalling current flows through all devices.
