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Technical data
B800-00-880 Issue D
Table 6 - nEXT pumps technical data
Parameter nEXT240D nEXT240T nEXT300D nEXT300T nEXT400D nEXT400T
Critical backing pressure N
2
9.5 mbar 20 mbar 9.5 mbar 20 mbar 10 mbar 20 mbar
Critical backing pressure He 7 mbar 8.5 mbar 7.5 mbar 8.5 mbar 8.5 mbar 8.5 mbar
Critical backing pressure H
2
2.5 mbar 3 mbar 2.9 mbar 3 mbar 3 mbar 3 mbar
Maximum continuous inlet flow
(at ultimate backing pressure)
*
*
Values for maximum continuous inlet pressure obtained using a RV12 backing pump at sea level in negligible
magnetic field. Values for maximum continuous backing pressure obtained under no flow conditions at sea
level in negligible magnetic field. Refer to Section 3.9 for cooling conditions. Above these pressures,
rotational speed drops below nominal.
Nitrogen:
Water cooling (40
°
C Ambient)
†
†
Cooling water temperature 15
o
C at a flow rate of 30 l hr
-1
.
45 sccm 55 sccm 95 sccm 65 sccm 105 sccm 50 sccm
Force air cooling (35
°
C Ambient) 30 sccm 50 sccm 115 sccm 100 sccm 90 sccm 105 sccm
Natural convection
(30
°
C Ambient)
10 sccm 10 sccm 35 sccm 25 sccm 45 sccm 25 sccm
Argon:
Water cooling (40
°
C Ambient) 35 sccm 35 sccm 63 sccm 42 sccm 70 sccm 49 sccm
Force air cooling (35
°
C Ambient) 20 sccm 28 sccm 76 sccm 70 sccm 70 sccm 77 sccm
Natural convection
(30
°
C Ambient)
7 sccm 7 sccm 20 sccm 20 sccm 28 sccm 20 sccm
Maximum continuous backing
pressure (at ultimate inlet pressure)
*
Nitrogen:
Water cooling (40
°
C Ambient)
†
6 mbar 2.75 mbar 6.75 mbar 4.75 mbar 7.5 mbar 4 mbar
Force air cooling (35
°
C Ambient) 4.75 mbar 2.75 mbar 7 mbar 8 mbar 7.5 mbar 9 mbar
Natural convection
(30
°
C Ambient)
1 mbar 0.4 mbar 2.75 mbar 1 mbar 4 mbar 1.25 mbar
Argon:
Water cooling (40
°
C Ambient) 4.75 mbar 2.75 mbar 6 mbar 3.75 mbar 6.5 mbar 4 mbar
Force air cooling (35
°
C Ambient) 3 mbar 1.5 mbar 6.5 mbar 7 mbar 6.5 mbar 8 mbar
Natural convection
(30
°
C Ambient)
0.5 mbar 0.2 mbar 2 mbar 0.75 mbar 3 mbar 1.2 mbar
Recommended backing pump RV12 / XDS10
Operation attitude Vertical and upright to horizontal ± 2
°
Vertical only for ‘nL’ variant pumps
Normal rotational speed 60,000 revolutions per minute
Starting Time to 90% Speed (160 W) 115 sec 140 sec 155 sec 175 sec 175 sec 200 sec
Starting Time to 90% Speed (200 W) 95 sec 120 sec 135 sec 150 sec 150 sec 170 sec
Sound pressure level (1 metre away) < 45 dB(A) ± 3dB(A) Declared dual number noise emission values in
accordance with ISO4871
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