Replacing Seals - Agilent Technologies SD-1 User Manual

8
Maintenance and Repair

Replacing Seals

Replacing Seals

Seals need to be replaced every so often because friction from the moving
pistons causes the seals to wear. Seal wear is accelerated under adverse
conditions, such as pumping at a high flow rate or pressure, pumping aqueous
solutions, or dirty or contaminated mobile phase. More gentle operation (low
flow, low pressure, organic solutions, fresh clean HPLC-grade mobile phases)
will result in longer seal life. However, every seal will eventually need
replacing. Software in the Agilent SD-1 allows you to both check the seal wear
and to log when the seals are changed. Each pump head in the Agilent SD-1
has one high-pressure piston seal, one washing section seal, and one o-ring.
Seals and o-rings are supplied in pairs. Both high pressure seals should be
replaced at the same time, both washing section seals should be replaced at
the same time, and both o-rings should be replaced at the same time. However,
you do not have to replace different types of seal at the same time. For
example, it is not necessary to replace the o-ring because you are changing the
washing section seal. Seals will wear at different rates: in general, you will
need to replace the high-pressure seals more often than the washing section
seals or the o-rings.
86 SD-1 Solvent Delivery - User Manual