When

  • Liquid droplets appear at a valve port

  • Liquid has collected in the leak tray

  • Liquid droplets appear at the drain hole

Figure: Drain hole on column switching valve

Follow these steps

  1. As leakage usually occurs at a connection, visually inspect all connections in the flow path.

  2. This step depends:

Situation

Action

Liquid droplets appear at a valve port

  1. Retighten the affected capillary.

  2. If liquid droplets still appear at the valve port, replace the capillary.

Liquid has collected in the leak tray

  1. Retighten all capillaries.

  2. If liquid still collects in the leak tray, replace the capillaries.

Liquid droplets appear at the drain hole

  1. If liquid is present, absorb the liquid with a tissue.

  2. If liquid droplets still appear at the drain hole, replace the column switching valve. See Replacing the Column Switching Valve.