Servomex SERVOPRO Plasma, Operator'S Manual

Page: 28 / 82

Plasma Gas Analyzer
26 02001001A_9
Figure 12 - IDEAL INSTALLATION EXAMPLE
PR1 is a miniature stainless steel high purity pressure regulator. The internal volume must be at
it’s absolutely minimum. Any unswept dead volume will cause noise and instability and, will
cause poor recovery time. PR1 should be installed close to the sample point. PR1 should be
installed only if there is large pressure excursion (over 69 kPa (10 PSIG)).
Figure 13 - POOR INSTALLATION EXAMPLE 1
Some users wish to monitor the inlet pressure. Connecting a pressure gauge at the inlet will
result in big unswept volume. This will cause poor response time, drift and noise.
Problems caused: long response time, will eventually read below the scale because of error of
calibration.