A sensor converts a physical quantity to be measured into another physical quantity that can be read and processed. In modern control, this physical quantity is an electrical signal; the transmitter converts the electrical signal of the primary sensor into a standard electrical signal, such as a current signal. 4--20mA, 0--20mA, voltage signal 0--10V, 1--5V. The primary pressure sensor is a pressure-induced strain that produces a millivolt signal change. If the sensor already has an amplification shaping circuit that outputs a standard current or voltage signal, such a sensor can also be called a pressure transmitter; the pressure transmitter is called Compared with the early pressure sensors, the millivolt signals are output. Most of the modern pressure sensors have directly output standard signals, so the current pressure sensors and pressure transmitters may be combined.
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