Waters 2998 - Page 70

4-8 Diagnostic Tests and Troubleshooting
Change in reference
spectrum
Mobile phase contains
gas or is contaminated
Prepare fresh mobile
phase and degas
thoroughly.
Air bubbles trapped in
flow cell
Reseat and check
alignment of flow cell.
Flush the flow cell (see
page 3-4), or apply
slight backpressure of
207 to 345 kPa (2 to
3 bar, 30 to 50 psi) on
the detector waste
outlet. For example,
connect a 1- to 2-foot
(30- to 60-cm) length of
0.009-inch (0.23-mm)
ID tubing connected to
the detector waste
outlet.
Continuous audible
tone
Detector failure Power the PDA detector
off and on again.
Detector not
responding to console
Bad or disconnected
cable
Inspect cable
connections, tighten
connectors, or replace
cable.
Configuration problemCheck Ethernet
configuration. For
details, see Empower
online Help.
Lamp light flashes
green and power light
constant green
The detector is
initializing.
No corrective action
required. Wait until
initialization completes
(both lights constant
green).
PDA detector troubleshooting (Continued)
Symptom Possible cause Corrective action