Is the ultimate pressure of a vacuum pump gauge pressure or absolute pressure?
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The ultimate vacuum of the WLW-300BC vacuum pump is 2000 Pa; is this value referred to as gauge pressure or absolute pressure?
Generally, it refers to absolute pressure...
Generally speaking, the vacuum level is equal to atmospheric pressure minus the absolute pressure inside the pump; for example, if the vacuum gauge reads 90 kPa, the atmospheric pressure is 0.1 MPa, so the absolute pressure inside the pump is 10 kPa. Gauge pressure equals absolute pressure plus atmospheric pressure
Gauge pressure; for this oil-free reciprocating pump, the vacuum gauge reading is at most -0.08 MPa
It must be absolute pressure; for gauge pressure, one standard atmosphere needs to be added. In the case of gauge pressure, it is expressed as a negative value, meaning it is a negative pressure