Pressure transmitter is a commonly used sensor suitable for industrial self-control environments. There are many types of sensors, including resistance strain gauges, semiconductor strain gauges, piezoresistive, inductive, capacitive, resonant, and capacitive acceleration sensors.

　　So, what are the characteristics of pressure transmitters?

　　In the two-wire transmission method, pressure transmitter manufacturers connect the power supply, load resistance, and transmitter in series, that is, two wires simultaneously transmit the power supply and output current signal required by the transmitter. Currently, most transmitters are two-wire transmitters; In the four wire system, the power supply and load resistance are respectively connected to the transmitter, that is, the power supply and the output signal of the transmitter are transmitted through two wires.

　　It is very easy to add one or two lightning and surge protection devices at the two wire output port, which is beneficial for safe lightning and explosion protection. The two wire current transmitter is not easily affected by parasitic thermocouples and resistance voltage drop and temperature drift along the wire, and can use very cheap and thinner wires; Can save a lot of cable and installation costs; When the output resistance of the current source is large enough, the voltage inside the wire loop induced by magnetic field coupling will not have a significant impact, because the current caused by the interference source is extremely small. Generally, twisted pair can be used to reduce interference; Two wire and three wire systems must use shielded wires, and the shielding layer of the shielded wire must be properly grounded.

　　In many applications controlled by microcontrollers, transmitters are used to convert signals that cannot be directly measured by microcontrollers into electrical analog signals that can be processed by microcontrollers, such as current transmitters, pressure transmitters, temperature transmitters, flow transmitters, etc.

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