Thermo Scientific Dionex ICS-5000, Operator'S Manual

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8 • DP/SP Troubleshooting
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Pressure fallen below lower limit.
This error occurs if the DP/SP pressure falls below the low pressure limit
specified in Chromeleon.
To troubleshoot:
1. The eluent supply may be depleted. Check the Eluent Level Display on
the Chromeleon 7 ePanel Set or Chromeleon 6.8 panel tabset to verify
that eluent is present in the selected channel. If the eluent reservoir is
empty, refill it (or select a channel that does have eluent). Prime the pump
before resuming operation (see
Section 9.5 ).
2. Check all eluent lines for air bubbles. If air is trapped in a line, replace the
end-line filter (P/N 045987). See Section 4.6 for instructions. Verify that
the end of each filter extends to the bottom of the reservoir and is
submerged in eluent. Prime the pump (see
Section 9.5 ).
3. Eluents may be insufficiently degassed. Check the vacuum degassing
module.
4. Check all tubing connections for leaks; tighten loose fitting connections.
Be careful not to overtighten fittings.
5. Make sure the priming valve is closed (see Figure 2-3 ). To close the
valve, turn the knob clockwise until closed. Tighten no more than
fingertight.
6. A check valve may be defective. Replace the check valve cartridges (see
Section 9.6 ) and then prime the pump (see Section 9.5 ).
Do not use any tools to tighten the priming valve! Overtightening may
destroy the cap seal. Open or close the priming valve only when the
system pressure is down.