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Published in last 50 years
918. High vacuum pumping system: Nash Engineering Co,Brit Patent 1,054,749, Patent Abstr, 7 (6) part B, 1 st Feb 1967, 2
A vacuum trip unit has been designed, using a thermocouple gauge and a transistorized d.c. amplifier, to operate relays in the interlock and protection circuits of a high-vacuum pumping system. The unit is simple to construct and set up, yet has proved stable and reliable in operation.
A new high vacuum pumping system is described in which oil* is used in a diffusion type pump, and a trap containing activated cocoanut charcoal replaces the usual liquid air trap. The system is capable of attaining a pressure of 2×10−8 mm Hg. A high degree of vacuum can be attained at least as quickly as with a mercury diffusion pump and liquid air trap. The system is especially adapted to maintaining a low pressure for several days in apparatus which cannot conveniently be sealed off from the pumps.