The role of the transmitter in the automatic detection and control system is to detect various process parameters, such as temperature, pressure, flow, liquid level, composition and other physical quantities, for display, recording or control purposes, to obtain accurate and reliable The value of the process parameter is the basis for control.
The transmitter is a converter that converts the output signal of the sensor into a signal that can be recognized by the controller (or converts the non-electricity input from the sensor into an electrical signal and amplifies the signal source for remote measurement and control). Transmitter is a device that converts physical measurement signals or ordinary electrical signals into standard electrical signal output or can be output by means of communication protocol.
(1) Signal conversion: Convert the electrical parameters output by the sensor into voltage or current.
(2) Amplification: Amplify the weak voltage or current signal. In some cases, signal isolation is also required.
(3) Filtering: filter out interference signals.
(4) Linearization: The measured physical quantity and the electrical signal often show a nonlinear relationship. Through the linearization circuit, the electrical signal and the physical quantity become an approximately linear relationship.
(5) Standardization: In order to facilitate the interchangeability of instruments, the long-distance signal transmission and the improvement of the anti-interference ability of the signal, the electrical signal is generally finally converted into a standard 4-20 mA DC current signal. Within the range, the measured physical quantity has a linear relationship with the current.
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