Transmitter principle
As the name suggests, transmitters contain the meanings of "change" and "send".
The so-called "change" refers to the transformation of various physical quantities from sensors into an electrical signal. For example, using thermocouples to convert temperature into electric potential; Use a current transformer to convert large current into small current. Due to the ease of processing electrical signals, modern transmitters convert various physical signals into electrical signals. Therefore, when we talk about transmitters, they usually become "electrical".
The so-called "sending" refers to unifying the electrical signals from sensors through electronic circuits (such as 4-20MA) in order to facilitate the reception and transmission of various transformed electrical signals by other instruments or control devices. The method is achieved through multiple operational amplifiers. This combination of "transformation" and "transmission" constitutes the most commonly used transmitter in modern times.
For example, Model A is a type of current transmitter that converts the output current of a current transformer into a standard 4-20MA current transmitter; For example, a certain model B can convert the weight signal from the weight sensor into a standard 4-20MA weight transmitter.
