8 | Help with faults
Büchi Labortechnik AG
80/102
Operation Manual Pure Chromatography Instruments
Malfunction
Possible cause
Solution
Pulsation of pump
Open or close time of the inlet
or outlet valves are not correct
u
Rinse the pump module with
high flowrate with ethanol
or hot distilled water.
u
Change check valves.
Residues in solvent
Sealing abrasion outlet valve
Inconsistent solvent
flow
Loose fitting/air leak into the
pump
u
Find the loose fitting
between mobile phase
reservoir manifold and
pump inlet fitting and
tighten it up.
Liquid leak/pump seals worn
out
u
Fix the leak/replace the
pump seals.
Pump head temperature
reaches solvent boiling tem-
perature, causing the pump to
lose prime and stop flow (this
is likely to occur when running
methods with highly volatile
solvents such as diethyl ether
and methylene chloride)
u
Premix the solvents to
reduce solvent volatility.
u
Place the highly volatile
solvent bottle in an ice bath
to eliminate boiling.
System pump pres-
sure is higher than
expected
Blocked solvent lines
u
Find the blocked lines and
replace it.
Over-tightened fitting
u
Loosen the fitting or replace
it.
Blocked columns or fluidic
path
u
Locate the component that
caused the blockage, repair,
or replace the component.
Leaks
Fitting connection not tight
u
Find the loose fitting and
tighten it up.
Damaged solvent line
u
Find the damaged solvent
line and replace it.
Pump not running
Pump sensor cable becomes
disconnected
u
Locate the cable and
reconnect to the pump
sensor.
Pump power cable becomes
disconnected
u
Locate the power cable and
reconnect to the main board
or to the pump.
Incorrect flow path Incorrect fluidic connections
to/from the mode switching
valve
u
Check/correct the fluidic
connections.
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