6
Maintenance
Minimizing Pump Pulsation
56
Accela Pump Hardware Manual
Thermo Scientific
Figure 37.
View of the tubing connected to the purge valve
Cleaning the LDA Components without Disassembling the LDA
Contaminated check valves and contaminated proportioning valves can cause an excessive
variation in backpressure. To remove the contamination, open the purge valve to bypass the
LC column and pump the appropriate flush solvents through the LDA.
Y
To clean the check valves and the proportioning valves
1. Open the purge valve by turning the wingnut to the left side of the LDA
counterclockwise (see
Figure 37
).
2. Set up the system to pump the same solvent on all four channels by connecting all four
solvent reservoir lines to one solvent bottle.
3. Attach a 10 mL disposable syringe to the tubing attached to the purge valve. The syringe
is supplied in the Accela Pump Accessory Kit (see
“Accela Pump Accessory Kit ”
on
page 97
).
PURGE
PULSE
DAMPENER
FLUSH
Tubing
(with fitting
for syringe)
CAUTION
Opening the purge valve redirects the flush solvent out the purge valve,
rather than out the front of the LDA. If you do not open the purge valve, the flush
solvent flows through the LC components such as the LC column that are
downstream of the LDA.
