The relationship and difference between transmitter and sensor

What is the difference between a transmitter and a sensor? Sensors and transmitters are the concepts of thermal instruments. Sensor is a general term for devices or devices that can be measured and converted into usable output signals according to certain rules, usually composed of sensitive elements and conversion elements. When the output of the sensor is a specified standard signal, it is called a transmitter. The concept of a transmitter is an instrument that converts non-standard electrical signals into standard electrical signals, and a sensor is a device that converts physical signals into electrical signals. In the past, physical signals were used, but now other signals are available. The primary instrument refers to the on-site measuring instrument or the base control meter, and the secondary instrument refers to the instrument that uses the primary meter signal to complete other functions: such as control, display and other functions. The sensor converts non-electrical physical quantities such as temperature, pressure, liquid level, material and gas characteristics into electrical signals or directly sends physical quantities such as pressure and liquid level to the transmitter. The transmitter is to amplify the weak electrical signal collected by the sensor in order to transmit or start the control element. Or a signal source that converts the non-electrical input from the sensor into an electrical signal and amplifies it for remote measurement and control. The analog quantity can also be converted into a digital quantity as required. The sensor and the transmitter together form an automatically controlled monitoring signal source. Different physical quantities require different sensors and corresponding transmitters. There is also a transmitter that does not convert physical quantities into electrical signals, such as a 'differential pressure transmitter' of a boiler water level gauge. On both sides of the bellows of the transmitter, the differential pressure on both sides of the bellows drives the mechanical amplifying device to indicate the water level with a pointer.

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