Nor-Cal RS Series Differentially Pumped Rotary Platforms - Manual (Page 2)

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Congratulations! You have purchased a precision vacuum rotation device from Nor-Cal Products. This unit is capable of many years of use
with minimal care and maintenance. This manual is a tool to aid you in obtaining this service. We at Nor-Cal encourage your comments and
suggestions on this product and its manual.
Product Description
T
he RS SERIES of differentially pumped rotating seals, supplied by Nor-Cal Products, are ultra high vacuum compatible devices. When
properly installed and pumped, systems have achieved base pressures of less than 2 x 10 -(11) Torr. They may be used in any vacuum
system where rotational motion is desired.
CONSTRUCTION
The metal components exposed to vacuum are type 304 stainless steel. There are two pumping chambers, isolated by three spring-loaded
Teflon-graphite seals. The chambers are pumped through the 1.33” mini-ConFlat type flanged ports. The internal sealing surfaces are
specially prepared by a proprietary manufacturing process.
Linear and lateral alignments are maintained by a series of special bearing assemblies. The bearings are made of hardened carbon steel.
WARNING..... These bearings will corrode. Do not allow moisture to condense on or in the unit. Do not allow LN2 to chill the
unit. If the internal probe is a cryogenic unit, consider mounting heating units to protect the seal. Whenever the unit is exposed
to moisture, it must be dis-assembled, cleaned and relubricated
LEAKS/PRESSURE BURSTS
THIS DEVICE IS A CONTROLLED LEAK. When properly installed and with suitable differential pumping, RS seals will show an effective
leak rate of between 1 x 10-9 and 8 x 10-9 std. cc He/sec., depending upon model. Pressure bursts will be observed as it is rotated. This is
normal. When correctly pumping on both pumping ports, the typical observed pressure burst will be 0.5 to 1.0 decade, with a system
base pressure of 2 x 10 -(10) Torr. Typical system base pressure recovery times range from 15 to 50 seconds, depending upon system
pump speed. The recovery time may vary depending upon system condition and pumps used.
A correctly installed and pumped platform will not indicate a leak when bag checked for 30 seconds with He, with a mass spectrograph
leak detector with a leak sensitivity to 5 x 10-10 std. cc /sec He.
CAUTION: Please read and follow the instructions to insure the seal will provide years of service.
RECEIPT
I
nspect the carton for exterior damage. If found, file the appropriate claim with the carrier.
UNPACKING
RS platforms are shipped with custom foam-in-place packing. We have found this to be the best system to provide protection for
shipment. The foam is separated approximately half way inside the crate with thin blue plastic. The unit is also double bagged in
polyethylene. This is necessary to assure no packing material or foreign matter is able to contaminate the unit in transit. We recommend
the packing box with packing be saved if possible, for equipment storage or possible future shipment.
Inspect the unit for hidden damage from shipment.