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Technical data
B722-20-880 Issue D
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.
Do not use an EXT to pump mercury vapour and do not allow mercury (for example, from a McLeod gauge) to
come into contact with the pump. If you do, the pump rotor may corrode and fail.
Note: Note that concentrations of gases may be modified by the compression of the pump.
Performance See Ta b l e 1 and 2
Cooling, noise and electrical data See Ta b l e 1 and 2
Dimensions See Tab l e 2 and 3
Maximum inlet-flange temperature 100 °C
Maximum magnetic field (EXT255H/Hi) 3.5 mT horizontal field; 7 mT vertical field
Maximum magnetic field (EXT70H/Hi) 5 mT
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 24 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 EXT70Hi 24 V and EXT255Hi 24 V 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.
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