Transmitter working principle and classification

What is a transmitter? What are the classifications of transmitters? How does the transmitter work? 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-electrical input of the sensor into an electrical signal and amplifies it for remote measurement and control). The sensor and the transmitter together form an automatically controlled monitoring signal source. Different physical quantities require different sensors and corresponding transmitters. There are many types of transmitters. The transmitters used in industrial control instruments mainly include temperature transmitters, pressure transmitters, flow transmitters, current transmitters, voltage transmitters, liquid level transmitters, etc. . Glossary A sensor that is used in an industrial field and can output a standard signal is called a transmitter. This term is sometimes used in conjunction with sensors. The transmitter is a converter that converts the output signal of the sensor into a signal that can be recognized by the controller. As for sometimes being common with sensors, it is because the output signal of most modern sensors is already a signal that a general-purpose controller can receive, and this signal can be directly recognized by the controller without being converted by the transmitter. Therefore, the meaning of 'transmitter' in the traditional sense should be: 'an instrument that converts the output signal of the sensor into a standard signal that can be accepted by the controller or measuring instrument'. In automatic control: signal source -->sensor-->Transmitter-->Calculator Controller -->Executive agency -->Control output. There are many types of transmitters. Generally speaking, the transmitter sends a signal to the secondary instrument to make the secondary instrument display the measurement data. It is a device that converts physical measurement signals or ordinary electrical signals into standard electrical signal output or can be output by communication protocol. Generally divided into: temperature/humidity transmitter, pressure transmitter, differential pressure transmitter, liquid level transmitter, current transmitter, power transmitter, flow transmitter, weight transmitter, etc. The principle transmitter As the name suggests, the transmitter contains the meanings of 'change' and 'send'. The so-called 'change' refers to the conversion of various physical quantities from sensors into an electrical signal. For example: use thermocouples to convert temperature into electric potential; use current transformers to convert large currents into small currents. Since electrical signals are easy to handle, modern transmitters convert various physical signals into electrical signals. Therefore, what we call a transmitter usually becomes 'electricity'. The so-called 'send' means to unify the electrical signal from the sensor through the electronic circuit again in order to facilitate the reception and transmission of other instruments or control devices (such as 4-20MA). The method is achieved through multiple operational amplifiers. This 'change' + 'send' constitutes a modern commonly used transmitter. There are many types of transmitters. The transmitters used in industrial control instruments mainly include temperature transmitters, pressure transmitters, flow transmitters, current transmitters, voltage transmitters, and liquid level transmitters. Wait. Unlike sensors, transmitters generally have a certain amplification effect in addition to converting non-electricity into measurable electricity. Pressure transmitter: The pressure transmitter is also called a differential transmitter, which is mainly composed of a pressure measuring element sensor, a module circuit, a display head, a case and a process connection. It can convert the received gas, liquid and other pressure signals into standard current and voltage signals to supply secondary instruments such as indicating alarms, recorders, and regulators for measurement, indication and process adjustment. The measurement principle of the pressure transmitter is: the process pressure and the reference pressure act on both ends of the integrated silicon pressure sensitive element respectively, and the differential pressure deforms the silicon wafer (the displacement is very small, only at the level of μm), so that the semiconductor technology is used on the silicon wafer. The fabricated full-dynamic Wheatstone bridge outputs a mV-level voltage signal proportional to the pressure driven by an external current source. Due to the strength of the silicon material, the linearity and variation index of the output signal are very high. When working, the pressure transmitter converts the measured physical quantity into a mV-level voltage signal, and sends it to a differential amplifier with a high amplification factor that can cancel each other's temperature drift. The amplified signal is converted into a corresponding current signal by voltage and current conversion, and then after nonlinear correction, a standard current and voltage signal in a linear correspondence with the input pressure is generated. Integrated temperature transmitter: The integrated temperature transmitter is generally composed of It consists of a temperature probe (thermocouple or thermal resistance sensor) and a solid electronic unit. The temperature probe is directly installed in the junction box in the form of a solid module to form an integrated transmitter. Generally divided into two types of thermal resistance and thermocouple type.
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