Edwards nEXT730D User Manual

5.2.4 Backing port connecon
The pump is suit
able for use with Edwards Rotary Vane, Scroll or diaphragm backing
pumps. System performance may depend upon which pump is used. Contact Edwards
when selecng an appropriate backing pump for the applicaon.
WARNING:
Ensure sa
fe ducng of the backing line if oil mist or hazardous substances are
present.
CAUTION:
The pump must not be oper
ated or vented from a posive pressure gas supply when
the backing line is restricted or blocked.
NOTICE:
Do not use the pump with a backing pressur
e below 5 x 10
-4
mbar (5 x 10
-2
Pa).
Lower backing pressures will increase the evaporaon rate of the lubricaon reducing
the bearing life.
Use suitable vacuum tubing and connectors to connect the ange of the backing port t
o
the backing pump. If necessary, use exible pipe or bellows to reduce the transmission
of vibraon from the backing pump to the pump.
5.3 Purge gas connecon
5.3.1 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
).
The ow rate of the purge gas must be limited to the allowed range. 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) is suitable for this purpose.
5.3.2 Connect the purge gas
Connect a purge gas supply to protect the pump.
1. To supply a purge gas to the pump, remove the plug ed in the purg
e port.
2. To t a vent port adaptor (refer to Accessories).
3. Connect the purge gas supply to the vent port adaptor.
5.4 Electrical installaon
Always make the electrical connecons to the pump aer the pump has been installed
on the vacuum system.
Do not remove the motor controller from the pump. There are no user-serviceable
parts.
08/2021 - ©Edwards Limited
Page 55B8J200880_D
300812671_002_C3
B8J200880_D - Inst
allaon

Edwards nEXT730D Specifications

General

Brand	Edwards
Model	nEXT730D
Category	Water Pump
Language	English