Oil Mist Filter Change for DS 402 Foreline Pump in ICP-MS Systems

Answer

This Information Applies To: Agilent ICP-MS (7700/7800/8800)

Issue

How to replace the Foreline Pump Oil Mist Filter in the DS 402 foreline pump.

Background

The oil mist filter element should be replaced yearly, or when the level of oil in the filter casing is above the mark on the oil-level sight-glass.

Items Required

• Oil mist filter for DS 402 (p/n 9499342M002)

Warning:  The surface of the foreline pump may be HOT, do not touch the pump until it has cooled. Never replace the oil mist filter while the pump is on. Properly dispose of the oil mist filter according to local law and regulations. Wear chemical-resistant gloves and safety glasses (goggles).

Steps to Follow

Checking the Oil Mist Filter

1. Locate the oil-level sight-glass on the side of the filter casing. If the level of the oil is above the mark, replace the oil mist filter.
   

   
   Figure 1. Checking the oil level in the filter casing
   
   

Replacing the Oil Mist Filter

1. Turn off the foreline pump (vacuum off) and confirm the foreline pump breaker switch on the back of the ICP-MS is in the off (O) position (down).
2. Disconnect the clamp and exhaust hose from the top of the oil mist filter assembly (Figure 2).
   

   
   
   Figure 2. Exhaust hose removed from filter case
   

3. Remove the cover fixing screws on the filter case using a 3 mm hex wrench (Figure 3).
   

   
   
   Figure 3. Remove the cover fixing screws of the oil mist filter casing
   

4. Remove the top cover, spring, and old oil mist filter (Figure 4).
   

   
   
   Figure 4. Remove the spring and old oil mist filter
   

5. Clean inside the case and the cover with paper towels (Figure 5).
   

   
   
   Figure 5. Clean inside the oil mist filter case
   

6. Confirm that there is an O-ring attached to the new oil mist filter element (Figure 6).
   

   
   
   Figure 6. Check for O-ring on new filter
   

7. Install the new oil mist filter inside the filter case, spring, and cover (Figure 7).
   Note: Ensure that there is an O-ring installed on the base of the casing cover!
   

   
   
   Figure 7. Install the new oil mist filter
   

8. Refit and tighten the cover fixing screws. When tightening the screws, tighten each screw a little at a time and evenly (Figure 8).
   

   
   
   Figure 8. Tighten the cover of the oil mist filter casing
   

9. Reconnect the clamp and exhaust hose to the top of the oil mist filter assembly (Figure 9).
   

   
   
   Figure 9. Exhaust hose reconnected to oil mist filter assembly
   

10. After maintenance is complete, turn on the foreline pump (Vacuum on)
11. Dispose of the used oil mist filter using correct laboratory procedures and according to local law and regulations.

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