When

  • Impaired permeability of the static mixer

  • Damage of static mixer

  • Leaky capillary mixer

Parts, tools and additional items required

  • As applicable

    • Static mixer

    • Capillary mixer

  • Depending on the capillary connection:

    • Viper capillary: Viper knurl (usually present on the capillary)

    • Conventional capillary (non-Viper): Open-end wrench, size 1/4"

  • Solvent suitable for purging

Preparations

  1. To flush out harmful substances, purge the pump with an appropriate solvent.

  2. To remove harmful substances from the components in the flow path after the purge unit, have the pump deliver for a short time with the solvent that was used for purging.

  3. Turn off the pump flow and wait until the system pressure is down to zero.

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. On the static mixer outlet, disconnect the capillary that connects the static mixer to the autosampler injection valve.

  1. Disconnect the capillary mixer on the purge/sensor unit.

  2. Pull the static mixer out of the mounting bracket.

  3. Remove the assembly of static mixer and capillary mixer from the pump.

  4. Disconnect the capillary mixer from the static mixer.

  1. Connect the capillary mixer to the static mixer.

    Mind the direction of flow through the static mixer and capillary mixer (indicated by the arrow on the mixer).

  2. Insert the assembly of static mixer and capillary mixer into the pump.

  3. Insert the static mixer into the mounting bracket.

  4. Connect the capillary mixer on the purge/sensor unit.

  5. On the static mixer outlet, connect the capillary to the autosampler injection valve.

  1. Apply the flow rate of your application and have the pump deliver for a short time.

  2. Inspect the flow connections on the mixer for indications of leakage before resuming operation.

  3. When the static mixer has been replaced: In the Chromeleon software, consider updating the Predictive Performance information for the static mixer (MixerChanged command).