Hitachi CHROMASTER 5160, Instruction Manual

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4.4.2 Abnormal Pressure
Abnormal high pressure
Abnormal variation of pressure
Flow path
system
Clogging of piping
between Drain
valve and Column
lnlet.
Clogging of
Drain valve filter.
Remove the filter, and clean it with an ultrasonic cleaner.
Has the pressure become high?
Remove the piping one by one from the Column side, and find
an abnormal point.
Yes
No
Replace the filter. (See 5.5.)
OK
Column
Clogged Column Filter.
or Clogging caused by
contamination of Fillers.
Remove the Column, and pump the liquid.
Has the pressure become close to zero?
Yes
No
Replace the column.
OK
(1) Attach the piping in the reverse direction, perform pumping with
a high flow rate to remove foreign matters.
(2) Cut the piping from the inside of the Ferrule part, and use it
again.
(3) After using a salt solvent, substitute distilled water for the inside
of the Flow path system.
Check valve
Bubbles are
generated in
Check valve.
Foreign matters in
Check valve.
Open the Drain valve fully, pump liquid for 3-5 minutes with
the maximum flow rate. (This should be performed when
bubbles are generated in the Pump after leaving the Pump
for a long time (2-3 days or longer).)
Open the Drain valve fully, pump liquid for 3-5 minutes with
the maximum flow rate.
Pump seal
Flow path system
Solvent filter
Contamination of
Solvent filter. (Clogging)
Bubbles in Pump
inlet tube.
Clogging of Drain
valve filter.
Life of Pump seal.
(Leakage)
Replace the seal. (See 5.3.)
See "Abnormal high pressure

Flow path system".
Degassing solvent
Cleaning with an ultrasonic cleaning, or replace the filter.
Symptom Check position Possible cause Check Result Remedy