Thermo Scientific Accela 1250, Руководство по оборудованию

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5
Maintenance
Replacing the Secondary Piston Seals
Thermo Scientific Accela 600 and 1250 Pump Hardware Manual 101
Replacing the Secondary Piston Seals
The secondary piston seals rarely require replacement. Replace the two secondary piston seals
if a Thermo Fisher Scientific representative has instructed you to do so as part of a corrective
or troubleshooting procedure.
The secondary piston seals are made of polyethylene (PE) for the Accela 600 Pump and GFP
for the Accela 1250 Pump.
 To replace the secondary piston seals
1. Remove the LDA from the pump (see “Removing the LDA from the Pump” on page 79 ).
2. Disassemble the LDA (see “Disassembling the LDA” on page 85 ).
3. Remove the used secondary piston seal as follows:
a. Carefully pull the piston out of the holding hook.
b. Dispose of the used secondary piston seal.
4. Check the piston for contamination and scratches, and then do the following:
• If the piston is in good condition, go to the next step.
• If the piston is scratched or appears cloudy, replace it.
• If the piston needs cleaning, clean it as described in “Cleaning the Pistons” on
page 103 .
5. Install a new secondary piston seal as follows:
a. Carefully guide the piston through the bore of the holding hook (see Figure 102 ).
b. Carefully slide a new secondary piston seal over the piston with the spring facing
away from the holding hook.
Figure 102. Holding hook with piston and seal
6. Remove the secondary piston spring from the piston guide bushing.
Secondary piston seal (for the Accela 600 Pump)
Holding hook