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This post was last edited by Yunmu on 2019-4-12 at 16:04. It’s always unclear what a transmitter is and what a preamplifier is. As you said, this should be an eddy current displacement sensor. Probes, cables, leads, and transmitters are components of sensors. The function of a transmitter is to convert the measured signal into a standardized signal. For the input, it is merely a measurement ； For the output, it must be a standardized and unified standard signal. The function of a lead is to separate a part of an instrument that can perform an independent function, such as the lead in displacement detection. Its role in measurement is to form a high-frequency oscillating circuit with the probe. At the output, the displacement signal is modulated or converted into a DC voltage, which does not necessarily meet the requirements of a standard signal. Preamble codes are used to convert field signals (pressure, temperature, etc.). It is converted into weak electrical signals, amplified, and then output to secondary instruments or DOS systems. The transmitter is a combination of a preamble and an amplifier. With the development of industrial process instruments, pressure transmitters are being used more and more widely. But when it comes to purchasing a pressure transmitter, it is necessary to determine which parameters are relevant, and how these parameters affect the use of the transmitter Next, I will explain the knowledge in this area to you. 1. The Rosemount pressure transmitter must remain stable after operating for an extended period of time. Most transmitters drift after operating for an extended period, so it is necessary to understand their stability before purchasing them. 2. To determine the type of pressure that the transmitter should measure, it is necessary to choose a transmitter with a wider pressure range, one whose pressure range is approximately 1.5 times larger. This is mainly because in many systems, especially in water pressure measurement and processing, there are peak values and continuous irregular fluctuations that can damage the pressure sensors. Continuous high pressure or a value slightly above the transmitter’s calibration will shorten the sensor’s service life.