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HAPSITE ER Operating Manual
7.6.4 Pressure Flows and Temperatures
The Pressure Flows and Temperatures tab displays various pressures that have
been set by the factory. The only pressure that can be changed by a user is the GC
Column Pressure. When using HAPSITE ER, the BPFB internal standard should
elute from the column between 3:40 and 3:50, with 3:45 being the optimal elution
time. If the standard elutes outside of this range, the pressure can be adjusted. To
increase the retention time by approximately three seconds, decrease the GC
Column Pressure by 1 kPa. To decrease the retention by approximately three
seconds, increase the GC Column Pressure by 1 kPa. After adjusting the
retention time, it is recommended that the user run another blank to verify that the
BPFB retention time is within range. (See Figure 7-66.)
Figure 7-66 Pressure Flows and Offsets tab
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