When

Filter clogged

Diagnostics script suggests replacing the filter

Parts required

Flowmeter filter kit

Tools and additional items required

  • Open-end wrench, size 13 mm

  • Solvent suitable to flush out harmful substances

  • Solvent suitable for your application

Parts affected

1233
Figure: Flowmeter filter (left: parts installed; right: filter removed)

No.

Description

1

Pump head

2

Capillary connecting pump head and flowmeter

3

Flowmeter filter

Preparations

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

  1. Prepare the replacement filter.

Preparing the Replacement Filter

1232.1.
Figure: Assembling the flowmeter filter

No.

Description

1

Filter screw

2

Filter screw seal

3

Filter frit

  1. With your fingers, push the seal onto the filter screw until the seal rests on the receiving edge.

  2. Pipette a drop of solvent into the filter screw and insert the filter frit. The solvent keeps the frit in the screw.

Follow these steps

  1. Remove the capillary that connects the pump head and the flowmeter.

  2. With the wrench, loosen the filter screw and remove the filter from the pump.

  3. Insert the new filter and tighten the filter screw with the wrench.

  4. Connect the capillary that connects the pump head and the flowmeter.

  5. Purge the pump and flowmeter using the solvent for your application.

  6. Inspect the connections for indication of leakage. Tighten leaky connections when the system pressure is down to zero.

  7. Check that the new filter works correctly. Run the script: D01 - Test System Back Pressure.

  8. Test the pump for leakage. Run the script: E04 - Detailed Leak test (Pump).