Pumping Media; Performance Characteristics - Edwards nXDS6i Instruction Manual

Description
Leak tightness (mbar l s
* These pumps are designed to pump down from atmospheric pressure, but prolonged
operation at inlet pressures higher than specified may reduce bearing life.
† These pumps are intended to exhaust to atmospheric pressure. High exhaust pressure
may reduce tip
‡ Larger volumes may be pumped, but prolonged operation at inlet pressures higher
than specified may reduce bearing life. The nXDS20i is optimised for constant throughput
and is not recommended for cyclic duty.
Note:
If the pump is operated outside the specified limits, then the pump housing may become
hot; the controller may reduce the motor speed; and tip seal wear rate will be increased.

3.2.1 Pumping media

WARNING:
Do not use the nXDS pump to pump pyrophoric materials or dust.
The pump is designed to pump the following gases:
▪ Air
▪ Carbon dioxide
▪ Helium
▪ Carbon monoxide
▪ Nitrogen
▪ Argon
▪ Oxygen (O
The pump can be used to pump water vapour. Caution must be taken to ensure that
vapour does not condense inside the pump. Refer to
how to prevent condensation of water vapour in the pump.
If pumping a vapour or gas not in the list above, contact us for advice.

3.2.2 Performance characteristics

The position of the gas ballast control defines the performance characteristics of the
pump. These performance characteristics are listed in
on page
A73501880_G - Technical data
-1
)
‑ seal life.
)
2
17.
nXDS6i
1 x 10
Gas ballast control on page 35
Table: Performance characteristics
Page 16
nXDS10i nXDS15i
-6 -6 -6
1 x 10 1 x 10
nXDS20i
-6
1 x 10
on