Edwards nXDS Series, Instruction Manual, Page: 16 / 32

A735-01-840 Issue B
Page 10 © Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Inlet/exhaust filter
4.3 Installation
4.3.1 Install the inlet/exhaust filter
Ensure the pump is switched off before fitting.
1. Inspect the mating port and seals faces, ensure they are free of dirt or any particulate which could cause the
vacuum seal to leak.
2. Place the centring ring in the end of the NW25 filter port and seat the filter onto the pump mating port. Ensure
the filter is fitted in the correct orientation (refer to Figures 1 and 4 ).
3. Fit the NW25 retaining clamp and tighten to secure the filter.
4.4 Maintenance
4.4.1 Introduction
Edwards recommends that a filter element replacement ( Figure 4 , item 3) should coincide with a tip seal change.
Refer to the maintenance plan in the nXDS pump manual for recommendations on changing the tip seal.
4.4.2 Removal of elements
Remove the filter from the system. Release the clamps ( Figure 4 , item 1) and remove the lid ( Figure 4 , item 3) from
the filter body ( Figure 4 , item 4). Remove the element for inspection.
Table 5 - Inlet/exhaust filter - checklist of components NW25 (A505-97-805)/ NW40 (A505-97-806)
Qty Description Check (

)
1 Filter assembly

2 NW clamp

2 Centring ring 
WARNING
Take all necessary precautions if toxic or dangerous substances have been pumped. Wear PPE
when handling contaminated filters and filter elements.
WARNING
Do not attempt to dismantle the filter whilst the pump is running. Ensure the pump is isolated from
its electrical supply before removing the filter.
Do not inhale the tip seal dust. Do not blow the tip seal dust from the filter with compressed air.