Edwards nEXT85 User Manual

Interstage connecon
Interstage connecon is only possible using an 'i' nEXT pump to back another pump.
1. Use suitable vacuum tube and connectors to connect the interstage port to the
vacuum system or to the outlet ange of another turbo or compound turbomolecular
pump.
2. Leave the inlet strainer in the interstage port, unless it is certain that debris cannot be
drawn into the interstage port.
Purge gas connecon
Recommended purge gas ow
The recommended purge gas ow for typical applicaons is
25 sccm (0.42 mbar l s
-1
, 42 Pa l s
-1
). This
ow will protect the pump when pumping oxygen in
concentraons above 20% by volume.
The
ow rate of the purge gas must be limited to the allowed range, specied in Purge gas
specicaon on page 90. To limit the ow rate, use a ow controller or a pressure regulator
and calibrated ow restrictor. The PRX10 purge restrictor accessory (refer to Accessories for the
nEXT85 on page 78) is suitable for this purpose.
Connect the purge gas
Connect a purge gas supply to protect the pump when pumping oxygen in
concentraons
above 20% by volume.
Note:
The purge gas must comply with the specicaon given in Purge gas specicaon on page
90.
1. To supply a purge gas to the pump, remove the plug ed in the purge port.
2. To t a vent port adaptor (refer to Accessories for the nEXT85 on page 78).
3. Connect the purge gas supply to the vent port adaptor.
Electrical installaon of the nEXT85
The electrical
installaon must be carried out by a suitably qualied person. Always make the
electrical connecons to the pump aer the pump has been installed on the vacuum system.
WARNING:
The pump must be electrically installed in accordance with regional and local codes,
conforming to local and naonal safety requirements. It must be connected to an
appropriately pre-approved power supply unit with a suitable earth (ground) point.
The nEXT85 pump can be operated using the Edwards TIC Turbo Instrument Controller, TIC
Turbo Controller or TAG Controller. The nEXT85 pump can also be powered by the customer
supply and controlled using the customer system. Refer to Connect the logic interface to control
equipment on page 26 for informaon about control and to Connect the electrical supply on
page 26 for instrucons on how to connect the electrical supply.
B8G0-00-880A - Install the nEXT85
Page 25

Edwards nEXT85 Specifications

General

Brand	Edwards
Model	nEXT85
Category	Water Pump
Language	English