Nor-Cal RS Series Differentially Pumped Rotary Platforms - Manual (Page 5)

5 Call toll free 800-824-4166 or 530-842-4457 • FAX 530-842-9130
USING ONE PUMP STAGE ONLY
IF YOU WISH TO USE ONLY ONE PUMP STAGE, CONNECT THE PUMP TO THE 2ND STAGE PORT.
Using one pump or no pump on the RS, will cause the system base pressure to degrade and limit ultimate system base pressure. In addition, system recovery time
from the pressure burst observed during RS rotation will increase.
OPERATION
PUMPING SEQUENCE
The user has the option of roughing and then starting the high vacuum pumps for the RS, and then roughing and starting main system high vacuum pumps, or
vice versa.
In our experience, we have found it easier to achieve crossover pressures in the main system if the RS pumps are started first.
RS expected pressures:
First stage: 1 to 10 microns second stage: 10(-6) to 10(-8) Torr
ROTATION
The RS may be rotated continuously in either direction; the direction of rotation may be reversed at any time.
THIS DEVICE IS A CONTROLLED LEAK. Pressure bursts will be observed as it is rotated, this is normal. When pumping on both
pumping ports, the typical pressure burst observed, with a system base pressure of 2 x 10 -(10) Torr, will be 0.5 to 1.0 decade. Typical system
base pressure recovery times range from 15 to 50 seconds. The recovery time may vary depending upon system condition and pumps used.
TORQUE
Depending upon the size of the RS, the user may find it difficult to rotate non-fine adjust models while under vacuum. Listed below are
approximate values of required torque for rotation.
The user may find it advantageous to make a set of handles, purchase a set of handles from Nor-Cal, or upgrade to a fine adjust model by
purchasing and installing a fine adjust kit available from Nor-Cal Products.
RS-150 4 ft.-lbs.
RS-250 6 ft.-lbs.
RS-400 12 ft.-lbs.
RS-600 22 ft.-lbs.
RS-800 32 ft.-lbs.
RS-1000 more than 50 ft.-lbs
VERNIER
The vernier is a reference for location.