Flushing The Piston Guide Bushings - Thermo Scientific Accela 600 Hardware Manual

Flushing the Piston Guide Bushings

Thermo Scientific
As the pistons move back and forth within the displacement chambers, a small quantity of
mobile phase leaks behind the primary piston seals. With buffered mobile phases, a precipitate
(also known as creep or salt build-up) forms as the liquid fraction evaporates. The abrasion
caused by this precipitate can scratch the piston and shorten the life of the piston seals.
If you use mobile phases that contain a high concentration of salts and you do not have the
seal wash pump, flush the piston seals at least once a day. The seal wash pump is an optional
pump that periodically flushes the piston guide bushings (see
on page 48).
 To flush the piston guide bushings
1. Connect a 10 mL syringe filled with distilled water to the bottom-outer tubing
(see Figure 105).
Figure 105. Syringe connected to the guide bushings for flushing
Purge valve wing nut
2. Gently push the water through the tubing.
Flushing the Piston Guide Bushings
"Seal Wash Pump Installation"
Accela 600 and 1250 Pump Hardware Manual
5
Maintenance
105