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Technical Information
Operation
During initial installation, the newly installed pump fluid may be subjected to
degassing. This may result in foreline pressure fluctuations that are considered
normal.
The following conditions increase the risk of explosion:
WARNING
• Air leaks into the system
• Roughing through a hot diffusion pump, which can cause hot hydrocarbon
fluids to ignite or explode when exposed to air
• Air release or the admission of air to a pump with a hot boiler (permitting a
strong oxidizer to contact the hot pump fluid)
• Pressure above 1 milliTorr (1.3X10
• Insufficient (or low level of) pump fluid
• Operating a pump without circulating cool water to the main body cooling
coils
• Operating pump with water trapped in Quick Cool coil
• Foreign matter in the pumping fluid, which changes its viscosity and
obstructs flow passages.
• Do not turn on the heater without fluid in the pump. This may ruin the heaters
CAUTION
and damage the pump.
• Do not air-release the pump while the boiler is hot. Most diffusion pump fluids
break down under these conditions.
• Do not operate the pump heater unless cooling water is circulating. Doing so
causes the pump and fluid to overheat.
• Do not operate without a foreline baffle. This can cause a greater than normal
fluid loss. *The HS-32 does not have a foreline baffle.
56
-3
mbar)
High Throughput Diffusion Pumps User Manual
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