Gauge pressure basics |
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| Pressure is represented by defining atmospheric pressure as zero. Pressure higher than atmospheric pressure is positive pressure, while pressure lower than atmospheric pressure is negative pressure. |
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Absolute pressure |
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| Pressure is represented by defining absolute vacuum as zero. |
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Gauge pressure is generally used. Absolute pressure is
used for scientific calculations, etc., and is distinguished
from gauge pressure by putting “abs” after the unit (for
example, mmHg abs). |
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| note: |
Atmospheric pressure varies depending on the weather, the altitude, etc. Therefore, a gauge pressure measuring instrument in which atmospheric pressure is defined as zero may not display the pressure value under absolute vacuum as “-760 mmHg”. |
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Withstanding pressure |
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| The maximum pressure that can be applied to the
pressure sensor. Applying pressure exceeding this value
will cause the pressure sensitive element to lose its
repeatability or to be damaged. |
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Display resolution |
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| The minimum unit that can be displayed. With the AP-31,
for example, the display resolution is 1 mmHg. Displayed
values change sequentially as follows; 99, 100, 101 .... |
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Repeatability |
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| Represents the detecting point tolerance range when
pressure is repeatedly applied under set conditions. |
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Responsibility |
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| Represents the delay time, that is, the time required from
pressure application to signal output. |
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Temperature characteristics |
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| Represents the fluctuation of the detecting point within the ambient temperature range. |
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Noncorrosive gases |
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| Noncorrosive gases include gases in the air (nitrogen
gas, carbon dioxide gas, etc.) and inert gases (argon
gas, neon gas, etc.). The AP Series cannot be used with
oxygen gas and hydrogen gas because they are highly
combustible. The AP Series also cannot be used for
helium gas because the molecular structure is extremely
small. |
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