Pump down curves and their information value
For the known geometry of the vacuum chamber and pumps, a pump down curve can be calculated. Any deviations between the calculated and the measured pump down curve will often provide information about problems in the vacuum system. This also applies to the comparison of curves measured over long-term use with a reference curve. A reference curve can be measured when the system runs properly and without any problems after startup. Under these conditions, the pressure drop is measured over time during pump down. The measurement can either be taken manually, using a system control, or using the software packages for pressure gauges provided by Pfeiffer Vacuum.
Fig.1: With its broad product portfolio, Pfeiffer Vacuum offers the optimal solution for various vacuum ranges and applications