TIP

With the dual pump, test each static mixer separately.

When

If you observe pressure pulsation, inconstant pressure, or high backpressure at the column and pump

Additional items required

  • Water as solvent

  • Tissue

Follow these steps

NOTICE

Turning the static mixer in the mounting bracket when loosening or tightening capillaries can damage the mounting bracket.

To prevent the mixer from turning in the bracket, hold the mixer with an open-end wrench when you loosen or tighten capillaries on the mixer.

  1. Disconnect the capillary on the outlet of the static mixer.

  2. To absorb liquid leaving the static mixer, place the tissue on the mixer outlet.

  3. Apply a flow of 2 mL/min using water.

  4. Observe the pump pressure.

  5. Depends on the pressure reading:

Pressure Reading

Action

Pressure is less than 0.8 MPa

Continue with the next step.

Pressure is 0.8 MPa or higher

Replace the static mixer.

  1. Reconnect the capillary to the outlet of the static mixer.

  2. Test the pump for leakage. See Testing the Pump for Leakage (General Test).