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| Identification of transmitter sensors |
| 2011-11-23 13:57:47 |
The concept of a transmitter is an instrument that converts non-standard electrical signals into standard electrical signals . Sensors are devices that convert physical signals into electrical signals. Physical signals were often used in the past, but other signals are now available. The primary instrument refers to the on-site measurement 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.
A sensor is a general term for a device or device that can be measured and converted into a usable output signal according to a certain rule. It usually consists of a sensitive element and a conversion element. When the output of the sensor is a specified standard signal, it is called a transmitter .
Sensors and transmitters were originally the concept of thermal instruments. The sensor converts non-electrical physical quantities such as temperature, pressure, liquid level, material, and gas characteristics 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 to transfer or activate the control element. Or convert the non-electrical input from the sensor into an electric signal and amplify it at the same time for a remote source for measurement and control. The analog quantity can also be converted into digital quantity as required. The sensor and transmitter together form an automatically controlled monitoring signal source. Different physical quantities require different sensors and corresponding transmitters. There is another type of transmitter that does not convert physical quantities into electrical signals. For example, a " differential pressure transmitter " for a boiler water level gauge. The remote side of the transmitter's bellows is a remote instrument that uses a differential pressure on both sides of the bellows to drive the mechanical amplification device to indicate the water level with a pointer. Of course, there is also a transmitter that converts electrical analog to digital.