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VCM101 bảng dữ liệu(PDF) 3 Page - List of Unclassifed Manufacturers |
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VCM101 bảng dữ liệu(HTML) 3 Page - List of Unclassifed Manufacturers |
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3 / 20 page ![]() 20 Mechanical pressure switches Definitions Definitions Pressure data Overpressure Pressure over the relevant atmospheric pressure. The reference point is atmospheric pressure. Vacuum Pressure under the relevant atmospheric pressure. The reference point is atmospheric pressure. Absolute pressure Overpressure relative to absolute vacuum. Differential pressure Difference in pressure between 2 pressure measuring points. Relative pressure Overpressure or vacuum relative to atmospheric pressure. Pressure data in all FEMA documents refers to relative pressure. That is to say, it concerns pressure differentials relative to atmospheric pressure. Overpressures have a positive sign, vacuums a negative sign. Permissible working pressure (maximum permissible pressure) The maximum working pressure is defined as the upper limit at which the operation, switching reliability and water tightness are in no way impaired (for values see Product summary). Bursting pressure (test pressure) Type-tested products undergo a pressure test certified by TÜV affirming that the bursting pressure reaches at least the values mentioned in the Product summary. During the pressure tests the measuring bellows are permanently deformed, but the pressurized parts do not leak or burst. The bursting pressure is usually a multiple of the permissible working pressure. Setting range Pressure range in which the cutoff pressure can be set with the setting spindle. Pressure units Important: All pressure data refers to overpressures or vacuums relative to atmospheric pressure. Overpressures have a positive sign, vacuums a negative sign. Unit bar mbar Pa kPa MPa (psi) Ib/m2 1 bar 1 1000 105 100 0.1 14.5 1 mbar 0.001 1 100 0.1 10-4 0.0145 1 Pa 10-5 0.01 1 0.001 10-6 1.45 · 10-4 1 kPa 0,01 10 1000 1 0.001 0,145 1 MPa 10 104 106 1000 1 145 In FEMA documents pressures are stated in bar or mbar. Pressure data for a pressure switchbased on the example of DWR625: Setting range: 0.5-6 bar Perm. working pressure: 20 bar Bursting pressure: >100 bar |
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