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| Vacuum |
Any
pressure below atmospheric pressure, measured as the extent of the
reduction below ambient atmospheric pressure. |
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Free
air |
Volume
of air at ambient conditions. |
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Expanded
air |
Volume
of air at ambient atmospheric temperature at a given vacuum level. |
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Vacuum
pump capacity |
The
air moving capacity of the vacuum pump when it has attained working
temperature, at a specified speed and vacuum level at the inlet, expressed
in a volume of free air per minute. |
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Working
vacuum |
The
controlled vacuum level, measured at a test point when all units (with
liners plugged) are operating. Accessories are connected, but not
necessarily operating. |
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Effective
reserve |
Reserve
vacuum pump capacity measured by admitting air near the regulator to lower
the vacuum 2.0kPa below the working vacuum. |
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Manual
reserve |
Reserve
vacuum pump capacity measured with the regulator inoperative by admitting
air near the regulator to lower the vacuum 2.0kPa below the working
vacuum. |
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Pulsation
chamber vacuum |
Each
cycle of the pulsation chamber is described as having four phases. |
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