A sensor is a general term for a device or device that can be measured by rules and converted into a usable output signal according to certain rules, which is generally composed of a sensitive element and a conversion element. When the output of a sensor is a regular gauge signal, it is called a transmitter.
The concept of a transmitter is an instrument that converts non-standard electrical signals into standardized electrical signals, and a sensor is a device that converts physical signals into electrical signals. The primary appearance refers to the on-site measurement surface or the base control table, and the secondary appearance refers to the appearance of using the primary meter signal to complete other functions: such as control, display and other functions.
Sensors and transmitters are thermal concepts. The sensor converts non-electrical physical quantities such as temperature, pressure, liquid level, material, gas characteristics, etc. into electrical signals or sends physical quantities such as pressure and liquid level directly to the transmitter. The transmitter amplifies the weak electrical signal collected by the sensor in order to transmit or activate the control element. Or convert the non-electric power input from the sensor into an electrical signal, and at the same time expand the signal source for remote measurement and control. Analog quantities can also be converted to digital quantities on request. Together, the sensor and the transmitter form the monitoring signal source for automatic operation. Different physical quantities require different sensors and corresponding transmitters.
There is also a kind of transmitter that does not convert physical quantities into electrical signals, such as a kind of "differential pressure transmitter" of boiler water level gauge, it is a distant appearance that sends the water in the lower part of the liquid level sensor and the condensate of the upper steam to both sides of the bellows of the transmitter through the outer surface pipe, and drives the mechanical expansion equipment to indicate the water level with a pointer by the differential pressure on both sides of the bellows. Of course, there are also transmitters that convert electrical analog quantities into digital quantities. The above is just a conceptual clarification of the differences between sensors and transmitters.
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