AVS 4, AVS 6 and AVS 7 Switching
Valve Maintenance Checklist
The following parts of the AVS 4, AVS 6, and AVS 7 require routine maintenance.
Any maintenance procedures not specifically mentioned should be carried
out only by Agilent-trained, Agilent-qualified or Agilent-authorized field
service engineers.
Daily
- Clean the surface of your switching valve accessories (spills should
be cleaned up immediately).
- Inspect the switching valve tubing if present. Replace if necessary.
- Check that the sample loop is filling completely for the first
few samples in the first run of the day.
- Check there are no blockages in the uptake line, sample probe or
connectors used on the uptake line.
- Check for blockages in the switching valve. If the loop still does
not fill completely, the rotor may need to be replaced.
- Check for increases in carryover in blanks. If carryover is increasing,
the valve may require the rotor and/or stator to be cleaned or replaced.
- Flush the sample flow path to remove acidic solutions. At the end
of each period of operation, always flush through the flow paths of
the switching valve accessory with deionized water or an appropriate
solvent for organic applications, such as isopropyl alcohol (propan-2-ol).
See also: