Thermo Scientific Accela 1250, Hardware Manual

Page: 131 / 170

5
Maintenance
Cleaning the Displacement Chambers and the Inlet Module
Thermo Scientific Accela 600 and 1250 Pump Hardware Manual 107
Cleaning the Displacement Chambers and the Inlet Module
If the primary piston seals have started to decompose and you observe black, fibrous particles
in the chamber, clean the displacement chambers.

To clean the displacement chambers and the inlet module
1. Remove the LDA from the pump (see “Removing the LDA from the Pump” on page 79 ).
2. Dismantle the LDA (see “Disassembling the LDA” on page 85 ).
3. Pry the piston seals out of the bores of the displacement chambers:
a. Carefully insert a piston into the hole in the center of the seal without pushing the
piston further into the bore of the displacement chamber.
b. Gently pry the seal out of the bore.
4. Using a needle, graphite pencil, or equivalent tool, carefully remove the PEEK film seals.
Be careful not to scratch the displacement chambers as you remove the film seals, as this
might cause leaking.
5. Place the displacement chambers and the inlet module in a container of water and place
the container in an ultrasonic bath for 10 minutes.
6. Place the displacement chamber and the inlet module in a container of acetone and place
the container in an ultrasonic bath for 10 minutes.
7. Install the PEEK film seals if they are not damaged; otherwise, replace them.
8. Replace the primary and secondary piston seals (see “Replacing the Primary Piston Seals”
on page 97 and “Replacing the Secondary Piston Seals” on page 101 , respectively).
9. Continue with one of the following:
• Perform other procedures that require access to the LDA (see “Removing the LDA
from the Pump” on page 79 ).
• Reassemble the LDA and reattach it to the pump (see “Reassembling the LDA” on
page 89 and “Reattaching the LDA to the Pump” on page 92 , respectively).
Note Both ends of the lower displacement chamber, the lower end of the upper
displacement chamber, and the bottom of the outlet module contain a PEEK film
seal. There is also a PEEK film seal between the LDA adapter and the lower check
valve for a total of five film seals.