Agilent Technologies PL-GPC 220, Руководство пользователя

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PL-GPC 220 User Manual 91
Maintenance
7
Back Pressure Regulator (BPR)
Back Pressure Regulator (BPR)
Replace the Back Pressure Regulator (BPR)
The BPR is located at the rear of the solvent delivery module and is designed
to provide a small backpressure (75 psi) on the purge line, when the purge
valve is open so that flow is maintained in the analytical columns during a
purge. Therefore, when the purge valve is opened, the solvent flow is split
between the chromatography columns and the reference side of the RI cell
maintaining flow through the column during the purge cycle. To ensure
optimum performance of the chromatography columns, it is important to
maintain flow through the columns at all times when operating at high
temperature.
The purge valve is operated from the software and can be opened either
manually or automatically programmed as part of the instrument set-up
rountine. During PURGE mode the backpressure displayed will be that of the
BPR and at all times should be less than the NORMAL operating pressure.
Figure 16 Purge Valve Purge Mode and Solvent Flow
1
Turn off the solvent flow.
2
Locate the BPR at the back of the solvent delivery module and remove it.
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