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Replacing the in-line filter cartridge on the primary check valve
Replacing the in-line filter cartridge on the primary check valve
Topic LCI-USG-0161, Last Updated 11/08/2024
Users or Waters field service personnel can replace the in-line filter cartridge on the pump primary check valve.
Warning: Observe Good Laboratory Practice (GLP) at all times, particularly when working with hazardous materials. Consult the Safety Data Sheets regarding the solvents you use. Additionally, consult the safety representative for your organization regarding its protocols for handling such materials.
Note: To avoid contaminating system components, wear clean, chemical-resistant, powder-free gloves when performing this procedure.
Required tools and materials
Chemical-resistant, powder-free gloves
Replacement in-line filter cartridge
To replace the in-line filter cartridge on the primary check valve:
Hold the ferrule holder fitting while unscrewing and remove the cap nut from the fitting.
Figure 1: Unscrewing the cap nut and ferrule holder
Ferrule holder fitting
Cap nut
Figure 2: Removing the cap nut from the ferrule holder
Ferrule holder fitting
Cap nut
Slide the cap nut down the tube and disengage the filter from the ferrule holder fitting.
Figure 3: Pulling the cap nut from the tube
In-line filter cartridge
Cap nut
Tube
Figure 4: In-line filter cartridge, locking ring, and cap nut
In-line filter cartridge
Metal locking ring
Cap nut
Tube
Slide the metal locking ring downward off the in-line filter cartridge and slide the cartridge off the tube.
Inspect the filter cartridge to determine whether it is constructed of stainless steel or titanium (Ti), and ensure that you have the correct replacement cartridge. No marking indicates a filter cartridge constructed of stainless steel, and "Ti" indicates a filter cartridge constructed of titanium.
Slide the cap nut over the end of the tube.
Figure 5: Sliding cap nut on tube
Cap nut
Tube
Slide the metal locking ring onto the tube, ensuring that the thicker end of the metal locking ring faces toward the cap nut.
Figure 6: Sliding metal locking ring on tube
Metal locking ring
Thicker end of metal locking ring facing toward cap nut
Tube
Cap nut
Unpack the new in-line filter cartridge.
Place the new in-line filter cartridge onto the end of the tube.
Figure 7: Placing in-line filter cartridge onto end of tube
In-line filter cartridge
Tube
Cap nut
Verify that the cartridge is bottomed out in the tube, and then slide the metal locking ring onto the boss on the bottom of the in-line filter cartridge while making sure the tube stays bottomed out.
Insert the in-line filter cartridge with tubing into the ferrule holder fitting, finger-tighten the cap nut until it bottoms out, and then tighten it 1/4-turn.
Figure 8: Installing the cap nut on the ferrule holder fitting
To avoid risk of personal injury and to prevent damage to laboratory equipment, always operate your Waters products in accordance with the applicable operational and safety information, your organization’s standard operating procedures, and local regulations.
Refer to the English version of this page for the latest information.
Pump maintenance procedures
