I have an X model compressor running a Y model cryopump(s), what should be the static pressure of the compressor before we start the system.
There are several models of compressors made by Austin Scientific and CTI - each model has a specified static pressure to run the system. Below is a table of popular compressors out in the field with their respective static pressures. (Static pressure means the pressure reading on the gauge(s) when the compressor is not running and has sat for about 30 minutes - there can be a deviation from the cold of night to the heat of the day of about 5 - 10 psig).
Whatever the static pressure of each compressor, the discharge pressures and return pressures will be in the same ballpark to run a cryopump. Typically, the discharge pressure will be in the 255 - 295 psi range and the return pressure will be in the 55 - 95 psi range.
The supply (discharge) and return pressures will change through the above ranges as the pump cools down.
(note - A/W means air or water cooled)
Compressor model. Static pressure Type of gauge on the compressor
(supply or/and return)
ASC model 125A/W 195 +/- 5 psig supply
ASC model 450A/W return
ASC model M600A/W 240 +/- % psig both gauges
CTI model SC(W) 250 +/- 5 psig supply
CTI model 8300 250 +/- 5 psig supply
CTI model 1020(R) 200 +/- 5 psig both gauges
CTI model 8500 200 +/- 5 psig return
CTI model 8510 200+/- 5 psig return
CTI model 9600 return
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