Hitachi PRIMAIDE 1440, Instruction Manual

Page: 145 / 204

4 - 32
Symptom Cause Judgment/Check Remedy
Excessive drift The warm-up period is
not sufficient.
⎯
Wait until the instrument
becomes stable (at least
10 minutes).
Mobile phase is leaking
from a fitting. Check each fitting. Retighten the offending
fitting.
An impurity is eluting
from the column. Stop feeding liquid
from the pump. Wait until elution is
completed, or replace the
column with a new one.
There is a significant
change in the ambient
temperature. Or low
purity solvent is used. Check solvent. Control the temperature
variation.
Purify the solvent or
replace it with one of a
higher quality.
Poor S/N ratio Flow cell contaminated Visual check Clean the flow cell
(see 4.4).
Xenon lamp off-position Check lamp energy
level Adjust lamp position
(5.2.1).
Error in flow cell
mounting Visual check Correctly mount flow cell
(4.4).
Flow cell surface
scratched Visual check Replace flow cell (4.4).
Poor wavelength
accuracy Water is not injected in
the flow cell.
⎯
Inject water into the flow
cell.
Bubbles have entered
the flow cell. Visual check Remove bubbles (4.4).
Poor adjustment of
xenon lamp position Check lamp energy
level. Adjust Xe lamp position
properly.
Error in flow cell
mounting Visual check Correctly mount the flow
cell (4.4).
Monochromator off-
position Check wavelength
accuracy. Perform wavelength
accuracy (4.3).
Leak error occurs Liquid has leaked. Visual check Wipe off the liquid which
has leaked to the drain
receptacle. Also wipe off
the liquid stuck to the leak
sensor (4.2.5).
Contaminant has stuck
to the leak sensor. Visual check Wipe off the contaminant
stuck to the leak sensor
(4.2.5).