• Description
  • Specification
  • Applications
  • XDS35i - small dry pump Scroll type
  • XDS46i - small dry pump Scroll type


XDS scroll pumps have become industry standard when dry pumping is essential, proving to be a robust and clean vacuum pump solution in a range of applications and processes.
The XDS35i pump has an innovative bearing shield that isolates the vacuum environment from all forms of lubricant, making it not only lubricant-free but hermetically sealed. XDS35iNGB variant has had the gas ballast feature removed for applications such as rare gas recirculation and gas recovery.
The XDS46i shares many of the same features of the XDS35i but with a peak speed of 40 m3h-1. The pump has been optimised for maximum pumping speed at inlet pressures between 1 mbar and 10 mbar, making it ideally suited for LCMS and ICPMS applications requiring higher pumping speeds.
The C variant has been modified so that it is more suitable for use on vapour handling processes and may be used in some applications using corrosive substances. The C version is fitted with Chemraz® internal valve pads and stainless steel exhaust port.


Lubricant-free within the vacuum envelope and hermetically sealed means a totally clean and dry vacuum to prevent cross contamination.
No atmosphere to vacuum shaft seals means bearings are completely isolated, this prevents process attack and enable the bearings to run cooler and last longer.
No oil to change eliminating cost of contaminated oil disposal.
Simple single sided scroll design allows maintenance to be done in minutes for low cost of ownership and maximum up‑time.
Inverter drive for consistent pumping speeds worldwide.
Pump range includes 35 and 40 m3h-1.


• Automotive; brake line and air conditioning evacuation.
• Backing turbomolecular pumps.
• Chemical applications including gel dryers and solvent recovery.
• Coating systems.
• High energy physics.
• Mass spectrometry.

XDS35i - small dry pump Scroll type

XDS35iXDS35i Enhanced
Peak pumping speedm3h-1(cfm)35 (21)
Ultimate vacuum (1)mbar (Torr)0,01 (0,008)0,03 (0,02)
Ultimate vacuum with gas ballast 1mbar (Torr)0,02 (0,015)0,04 (0,03)
Ultimate vacuum with gas ballast 2mbar (Torr)< 10 (7,5)
Max inlet pressure for water vapourmbar (Torr)35 (23)
Water vapour handling capacity GBIIgh-1240
Maximum continuous inlet pressurembar a (Torr a)40 (30)(2)1000 (760) *
Maximum gas ballast/purge pressurebar gauge (psig)0,5 (7)
Motor data
Supply voltageV100 – 120 / 200 – 240 (+/- 10%)
Supply frequencyHz50 / 60
Nominal rotation speedrpm1750
Power at ultimateW440
Motor powerW520
Power connectorIECEN60320 C19
Recommended fuse, 230 V (115 V)A16 (3) (15)
Physical data
Weightkg (lb)48 (105)
Inlet connectionNW40
Exhaust connectionNW25
Noise level at ultimatedB(A)57
Vibration at inlet flangemms-1 (rms)< 4,5
Leak tightness (static)mbar ls-1< 1 x 10-6
Operating temperature range°C (°F)5 – 40 (41 – 104)

* Use at higher inlet pressure speeds up tip seal wear

(1) measured as total pressure

(2) These pumps are designed to pump down from atmospheric pressure, but prolonged operation at inlet pressures higher than specified may reduce bearing life.

(3) for UK 240 V use 13 A fuse

XDS46i - small dry pump Scroll type

Displacement 50 or 60Hz60 m3h-1 / 35 ft3min-1
Peak pumping speed 50 or 60Hz40 m3h-1 / 23,5 ft3min-1
Ultimate vacuum (Total pressure)5 x 10-2 mbar / 4 x 10-2 Torr
Max continuous inlet pressure40 mbar / 30 Torr
Max continuous outlet pressure0,2 bar gauge / 2,9 psig
Max allowed inlet and GB pressure0,5 bar gauge / 7 psig
Motor power0,52 kW
Power connectorIEC EN60320 C19
Nominal rotation speed1750 rpm
Weight48 kg / 105 lb
Inlet flangeNW40
Exhaust flangeNW25
Noise level55,4 dB (A)
Vibration< 4,5mms -1 (rms)
Leak tightness (static)< 1 x 10-6 mbar ls-1
Operating temperature range10 – 40 °C / 50 – 104 °F