Advantages of using two-wire current transmitters in industrial control

In industry, it is generally necessary to measure various non-electrical physical quantities, such as temperature, pressure, speed, angle, etc. In addition, electrical physical quantities (referred to as electrical quantities), such as current, voltage, power, frequency, etc., need to be converted into standard analog electrical signals before they can be transmitted to the control room or display device hundreds of meters away. This device that converts physical quantities into electrical signals is called a transmitter. The most widely used standard analog electrical signal in industry is to use 4~20mA DC current to transmit analog quantities.