What are the differences and connections between transmitters and sensors?
Sensor is the general name of devices or devices that can be measured and converted into usable output signals according to certain rules. It is usually composed of sensitive elements and conversion elements. When the output of the sensor is the specified standard signal, it is called a transmitter. The concept of transmitter is an instrument that converts non-standard electrical signals into standard electrical signals, while the sensor is a device that converts physical signals into electrical signals. In the past, physical signals were often used, but now other signals are also available. The primary instrument refers to the field measuring instrument or the base control meter, and the secondary instrument refers to the instrument that uses the signal of the primary meter to complete other functions, such as control, display and other functions. Sensors and transmitters are the concepts of thermal instruments. 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 amplifies the weak electrical signal collected by the sensor to transmit or start the control element. Or convert the non-electrical quantity input by the sensor into electrical signal and amplify it for remote measurement and control. Analog quantity can also be converted into digital quantity as required. The sensor and transmitter together constitute the monitoring signal source of automatic control. 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 the boiler water level gauge. It is a remote instrument that sends the water at the lower part of the level sensor and the condensate at the upper part of the steam to both sides of the transmitter's bellows through the instrument pipe, and drives the mechanical amplification device to indicate the water level with the pointer by the differential pressure at both sides of the bellows. Of course, there is also a transmitter that converts electrical analog quantity into digital quantity.
