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There are a ubiquitous number of pressure transducer designs available for use in any number of industrial or laboratory applications. These include the industrial pressure transducer, the liquid pressure transducer, and the micro pressure transducer, among others.
Pressure transducers can come in a number of shapes and sizes, but the majority of transducers have a cylinder-shaped center which houses the diaphragm and the measurement pressure chamber, a pressure port at one end which is typically a threaded, bolted, barbed fitted, or open, and on the other end a location for signal transmission.
Mechanical methods for pressure measurement have been known for centuries. U-tube manometers were among the first pressure indicators. Originally, these tubes were made of glass, and scales were added to them as needed. But manometers are large, cumbersome, and not well suited for integration into automatic control loops. Therefore, manometers are usually found in the laboratory or used as local indicators. Depending on the reference pressure used, they could indicate absolute, gauge, and differential pressure.
Differential pressure transducers often are used in flow measurement where they are designed for differential pressure measurement across a venturi, orifice, or other type of primary element. The detected pressure differential is related to flowing velocity and therefore to volumetric flow. Many features of modern pressure transmitters have come from the differential pressure transducer. In fact, one might consider the differential pressure transmitter the model for all pressure transducers.
"Gauge" pressure is defined relative to atmospheric conditions. In those parts of the world that continue to use English units, gauge pressure is indicated by adding a "g" to the units descriptor. Therefore, the pressure unit "pounds per square inch gauge" is abbreviated psig. When using SI units, it is proper to add "gauge" to the units used, such as "Pa gauge." When the measurement of the pressure is in absolute units, the reference is full vacuum and the abbreviation for "pounds per square inch absolute" is psia.
| Item | Compair Pressure Sensor |
| Brand | DFS- Made in China |
| Model | 060G6763 |
| Range | -1~15bar |
| Output | 4~20mA |
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