Waters 2414 - Page 108

June 11, 2015, 715004754 Rev. A
Page 108
Short-term noise cycling
(30 sec to 60 sec)
Pump pulsing Add pulse dampener, and
stop the flow, to confirm
the correction.
Inadequate solvent
blending in pump
Connect high-flow pulse
dampener.
Use gradient mixer.
Flow cell can contain an air
bubble
Properly purge the
system.
Flow fluctuating Stabilize flow (see pump
overview and maintenance
guide).
Solvent not mixed (short-
or long-term cycling)
Stir the solvent.
Faulty check valve Clean, replace, or rebuild
pump check valves.
AC power source (short- or
long-term cycling)
Disconnect other
instruments on the
electrical circuit; use a
different wall outlet;
determine the suitability of
the line voltage; use
power conditioner.
Radio frequency noise
(short or long-term
cycling)
Eliminate interference.
Improper ambient
environment
Verify and correct ambient
temperature and humidity.
Long-term noise cycling
(approximately 1 hour)
Ambient temperature
fluctuations
Stabilize ambient
temperature.
Integrator or recorder
faulty
Examine integrator or
recorder for excessive
baseline noise.
Faulty check valve Clean, replace, or rebuild
pump check valves.
Flow cell can contain an air
bubble
Properly purge the
system.
Table 7–3: Abnormal baseline troubleshooting (continued)
Symptom Possible cause Corrective action