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Technical data
B753-03-880 Issue F
2Technical data
2.1 General
2.2 Pumping media
Do not use an EXT to pump gases containing more than 20% oxygen unless the pump is gas purged. If you do, the
lubricant will polymerise and the pump will fail prematurely.
Note: Note that concentrations of gases may be modified by the compression of the pump.
2.2.1 Pumps without gas purge
The pumps are designed to pump the following residual gases normally used in high-vacuum systems:
Performance See Tab le 1
Dimensions See Figure 4 and 5
Maximum inlet-flange temperature 100 °C
Maximum magnetic field 3.5 mT Horizontal field >7mT Vertical field
Installation category EN61010 part 1, Category 1
Pollution degree CAN/CSA, UL, EN61010 part 1
Altitude 2000 m
Humidity 10 to 90% non condensing
Electrical supply 80 V d.c.
Equipment type Fixed equipment, for indoor use only
Vent dangerous gases and gas mixtures safely. Do not expose people to these gases.
Do not use EXT pumps to pump explosive gas mixtures as the pumps are not suitable for this
purpose.
On EXT255Hi and EXT255HVi pumps, gas pumped through the interstage-port will mix with gas
pumped through the pump-inlet. Ensure that the gases will not react or combine to form dangerous
gases and substances.
z Air z Carbon monoxide z Neon z Ethane z Methane
z Nitrogen z Krypton z Argon z Propane
z Carbon dioxide z Helium z Hydrogen z Butane
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