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Diaphragm pressure gauges are believed as specialists in the process industries. They come into play when Bourdon tube pressure gauges reach the limits of their performance. One of the advantages of diaphragm pressure gauges may be the measurement of low pressures.
Diaphragm pressure gauges could be recognised from the initial look: From the flanges below the case, between that your elastic pressure element ? the diaphragm element ? is clamped. These instruments can measure pressures from as low as 16 mbar, with the utmost value at around 25 bar (for comparison: Bourdon tube gauges reach their lowest physically possible measured value at 600 mbar). The larger the diaphragm element, the lower the measurable pressure is, relative to the formula ? pressure = force / area. Shameful : with a diameter of 134.5 mm for the measuring ranges of 0 ?16 mbar around 0 ? 250 mbar and a diameter of 76.5 mm for the measuring ranges of 0 ? Direct up to 0?25 bar.
Special variation of diaphragm pressure gauges
With pressures under 16 mbar, diaphragm pressure gauges hit their limits. For this case, their diaphragms would need to be exceptionally thin in order to achieve the mandatory elasticity. Then, however, they might no longer remain reliably stable. This problem can be solved, though, with a particular variation of the diaphragm pressure gauge: the capsule pressure gauge.
Alarmed contain two diaphragms welded together, which are generally packed with pressure from the within. This results in a double diaphragm travel. In this manner, even the cheapest of pressures can be measured without reducing the wall thickness. However, since the pressure chamber is not self-draining, capsule elements aren’t ideal for applications with liquid media.
Note
You can find more info on diaphragm pressure gauges on the WIKA website under the headings Pressure gauges and Pressure gauges with output signal.
See also our article
Advantages of diaphragm pressure gauges (2): High overload protection