沃特世仪器说明书e2695 Head Seals Replace.pdfVIP

REV. A 1 OF 6 Replacing the Head Seals Select this procedure to replace the plunger seal or the face seals in the e2695 Separations Module pump head. When to Replace • If the retention times are erratic • If the pump head is leaking solvent • If there are large pressure fluctuations NOTE: The face seals do not need to be replaced every time the plunger seal is replaced. Replace the face seals after the plunger seals have been replaced two to three times. Use this procedure to replace only the plunger seal or the face seals in the head assembly. Parts Required • (1) Wash Tube Seal Replacement Kit (4/kit), WAT270940 • (1) Plunger Wash Seal Replacement Kit (2/kit), WAT271018 • (2) Seal Wash Face Seal Replacement Kit (1/kit), WAT271017 Tools/Materials Required • 100% Methanol • Lint-free absorbent towel • Seal removal tool, WAT039803 • Seal insertion tool, WAT270969 • Priming syringe, 30 mL, WAT270949 Preparation NOTE: Ensure the gradient proportioning valve is turned off to prevent siphoning of mobile phase. 1. From the e2695 Separations Module Main screen, press the Diagnostics key. The Diagnostics screen appears (Figure 1). Replacing the Head Seals REV. A 2 OF 6 Figure 1 - Diagnostic Screen 2. Press the Other Tests key and select Turn Off GPV from the list. 3. Press OK. A message box appears indicating that the gradient proportioning valve is off (Figure 2). Figure 2 - GPV Status Screen 4. Open the solvent management compartment doors. Replacing the Head Seals REV. A