Maintenance Schedule - Agilent Technologies SD-1 User Manual

Isocratic solvent delivery module

Table of Contents

Maintenance Schedule

User maintenance on the Agilent SD-1 Pump is generally limited to the pump

head, as follows:

• Cleaning the check valves and filter.

• Replacing components subject to wear and tear: piston seals, check valves,

Continuous, unattended operation is common with HPLC components. A

general guideline for the replacement frequency of consumable components is

indicated in the table below. The table assumes the pump is working at half its

maximum flow rate and pressure. Replacement frequency is indicated for

intensive, regular, and occasional pump use.

The solvent used also effects replacement frequency. Mobile phases with

buffers and high ionic strength will cause the seals to fail more frequently.

Table 20

Frequency of component replacement

Component/Use

Intensive (168 hrs/wk)

Piston seal

4–6 months

Check valves

6–12 months

Piston assembly

1–2 years

Seal back-up

1–2 years

Return spring

2 years

This table is only a guideline; pump head components may need to be replaced more or less

N O T E

often than indicated.

Changes in performance, or visible leaks, give more precise indication that a part should be

replaced.

Seals need to be replaced every so often. This is because friction from the

moving pistons eventually abrades the seal and pressurized liquid in the

piston chamber seeps past the seal. Seal wear may be indicated by leaks from

SD-1 Solvent Delivery - User Manual

piston assembly, seal back-up, return spring.

Regular (40 hrs/wk)

1 year

2 years

4–6 years

Maintenance and Repair