Using The Pressure Display As Diagnostic Tool - Agilent Technologies SD-1 User Manual

Using the Pressure Display as Diagnostic Tool

The sensitivity of the pressure display is within 68.9 kPa (10 psi). The
pressure display can be used as a diagnostic tool. Following issues cause
characteristic pressure fluctuations in HPLC systems (parameters valid for
HPLC operating at normal pressure):
• Zero to several hundred kPa: Bubbles in the solvent
• 68.9 – 275.8 kPa Sticking check valve
If fluctuations > 68.9 kPa try to eliminate bubbles in the solvent (see
H I N T
from the Liquid Head"
If this does not solve the problem, a check valve is probably sticking. It may be possible to
rectify this problem by cleaning the check valve (see
SD-1 Solvent Delivery - User Manual
Using the Pressure Display as Diagnostic Tool
on page 84).
Troubleshooting and Diagnostics
"Clearing Air Bubbles
"Cleaning Check Valves"
6
on page 95).
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