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About Pressure Gauges
Pressure gauges are used for a variety of industrial and application-specific pressure monitoring applications. Uses include visual monitoring of air and gas pressure for compressors, vacuum equipment, process lines and specialty tank applications such as medical gas cylinders and fire extinguishers. In addition to visual indication, some pressure gauges are configured to provide electrical output of indicated pressure and monitoring of other variables such as temperature.
It is important to select a pressure range that accommodates all anticipated pressure swings, and which prevents excessive needle movement. It is recommended to confine normal operating pressure to 25% to 75% of scale. With fluctuating pressure (e.g., pulsation by a pump or compressor) the maximum operating pressure should be lower (50% of the full range). Choices for pressure gauges measurement ranges include positive pressure, vacuum measurement, compound measurement, differential pressure, absolute pressure, and sealed pressure. A positive pressure gauge measures a pressure range from zero pressure to a higher, positive pressure. Vacuum measurement switches measure vacuum pressure (negative pressure). A compound pressure gauge measures a pressure range from negative pressure (vacuum) to positive pressure. Differential pressure gauges give the relative pressure between two points. If both operating pressures are the same, the measuring element cannot move and no pressure will be indicated. A differential pressure is indicated when one pressure is higher or lower. Low differential pressures can be measured directly in cases of high static pressures. Absolute gauges are used where pressures are to be measured independently of the natural fluctuations in atmospheric pressure. The pressure of the media to be measured is compared against a reference pressure of absolute zero (absolute vacuum) in a sealed reference chamber. Sealed gauge pressure measurement is similar in concept to an Absolute Pressure gauge, except that the pressure of the media to be measured is compared to standard atmospheric pressure (at sea-level).
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Engineering Web: Pressure Gauges
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Part Numbers for Pressure Gauges
| Part # | Distributor | Manufacturer | Product Category | Description |
|---|---|---|---|---|
| 500-S PRESSURE GAUGE | netCOMPONENTS | Not Provided | Not Provided | Not Provided |
| 500-S PRESSURE GAUGE | netCOMPONENTS | Not Provided | Not Provided | Not Provided |
| Manifold Set – with High Pressure Gauges for R-410A, with three 60" | HVAC PLUS | Not Provided | Not Provided | Not Provided |
| MG-1000-A-9V-R | Digi-Key | SSI Technologies Inc | Sensors, Transducers | SENSOR DIGITAL GAUGE 1000PSI LCD |
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