Instruction Manual nXDS Pump Accessories

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© Edwards Limited 2013. All rights reserved. Edwards and the Edwards logo are trademarks of Edwards Limited.

© Edwards Limited 2013. All rights reserved. Edwards and the Edwards logo are trademarks of Edwards Limited.

Associated publications Publication title Vacuum pump and vacuum system safety © Edwards Limited 2013. All rights reserved. Edwards and the Edwards logo are trademarks of Edwards Limited.

This page has been intentionally left blank. © Edwards Limited 2013. All rights reserved. Edwards and the Edwards logo are trademarks of Edwards Limited.

This manual provides installation, operation and maintenance instructions for the Edwards range of accessories for the nXDS pump range. The accessories are shown in Figure 1. The Item Numbers for the accessories are listed in the appropriate sections. The accessories must be used as specified in this manual. Read this manual before installing accessories onto the nXDS pump. Important safety information is highlighted as WARNING and CAUTION instructions; these instructions must be obeyed. The use of WARNINGS and CAUTIONS is defined below. WARNING Warnings are given where failure to observe the...

Installation and operation safety WARNING Use the procedures described in this manual to install the accessory. Obey all safety instructions and take note of all appropriate precautions. If not, damage to the accessory or other equipment and injury to people can result. WARNING The user of the nXDS pump system is responsible for the safe operation and monitoring of the system. WARNING Before installing the accessory, ensure the pump is off and the controller is isolated as described below. Before installing the accessory:  Switch off the nXDS pump and wait until the pump has stopped rotating....

Figure 1 - Accessories for nXDS pumps - general view (o-ring seals not shown) 1. Gas ballast adaptor blank 2. Gas ballast adaptor 3a+b. Inlet/exhaust filter 4. Silencer Exhaust nozzle Vibration isolators Chemical resistance conversion kit Pump-to-controller cable (not shown) © Edwards Limited 2013. All rights reserved. Edwards and the Edwards logo are trademarks of Edwards Limited.

This page has been intentionally left blank. © Edwards Limited 2013. All rights reserved. Edwards and the Edwards logo are trademarks of Edwards Limited.

Gas ballast adaptor blank The gas ballast adaptor blank (Figure 1, item 1) allows conversion from a standard nXDS pump into an nXDS-R pump. The gas ballast control is replaced with a blank adaptor to prevent accidental air admittance into the pump. This feature is also useful for applications such as rare gas recirculation or gas recovery. Installation Table 1 - Gas ballast adaptor blank - checklist of components (A735-01-806) Qty Gas ballast adaptor blank O-ring 19.6ID X 2.4 Install the gas ballast adaptor blank The method for installing the gas ballast adaptor blank follows some of the stages...

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The gas ballast adaptor (Figure 1, item 2) fits in place of the gas ballast control. The gas ballast adaptor allows connection of a controlled supply of inert gas such as nitrogen into the low vacuum stage of the pump. The gas purge can be used to dilute flammable gases down to a safe level (Edwards recommends 1/4 of the Lower Explosive Limit). An inert purge can also be used to reduce the likelihood of gas vapours such as iodine from condensing at the outlet stage of the pump. Technical data Table 2 - Gas ballast adaptor technical data Maximum permitted gas ballast inlet pressure Orifice diameter...

Ensure the pump is switched off before fitting. 1. Undo the 2 off retaining bolts and partially remove the fan cowl. Caution: Cooling fan supply lead attached. 2. Carefully disconnect the cooling fan electrical supply lead and remove the fan cowl. 3. Using a 21 mm AF spanner, remove the gas ballast control assembly. 4. Carefully remove the gas ballast control seat and O-ring. 5. Assemble the gas ballast adaptor and new O-ring, ensure the O-ring and seal surface are clean and free of dust or dirt. 6. Reconnect and assemble the cooling fan supply lead and fan cowl (1) in reverse order. Torque the...

Inlet/exhaust filter Description CAUTION This filter is not designed to withstand positive pressures. Ensure that any system valves are correctly scheduled to avoid pumping to a closed exhaust line. Refer to the Installation section of the nXDS pump instruction manual. The inlet/exhaust filter performs a number of functions. It can be connected in-line between the nXDS pump exhaust and the exhaust extraction system (Figure 1, item 3a), this is especially useful for process applications such as gas recirculation. Alternatively, it can be connected in-line between the nXDS pump inlet and the chamber...

Inlet/exhaust filter Installation Table 5 - Inlet/exhaust filter - checklist of components NW25 (A505-97-805)/ NW40 (A505-97-806) Qty Filter assembly Centring ring 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...

Inspection and replacement of the element WARNING Take all necessary precautions if toxic or dangerous substances have been pumped. Wear PPE when handling contaminated filters and filter elements. CAUTION At high temperature (in excess of 250 ºC) tip seal wear product will begin to decompose, giving rise to gaseous fumes which can produce unpleasant symptoms. The filter may be contaminated with the process chemicals that have been pumped during operation. Ensure that the pump is decontaminated before maintenance and that adequate precautions are taken to protect people from the effects of dangerous...