START-UP PROCEDURE FOR THE PUMP
AND THE LEAK DETECTOR

Last update: 2002

Before plugging in the pump, set the following controls to the initial position indicated below.

Right Front corner of stainless steel

Top START/VENT

RESET

Control Panel

Pump Leak Indicator Panel

THRESHOLD FULL	COUNTER CLOCK WISE (CCW)
VOLUME FULL	CCW

1. Plug in machine. The compressor should start if the air pressure is low.
2. Turn on the PUMPS circuit breaker for the ROUGH, FORE and DIFF.
3. Allow 30 minutes for the diffusion pump to warm up, then place the ELECTRONICS circuit breaker in the ON position. Verify that the SPECTROMETER TUBE PRESSURE meter reads upscale (may take up to 2 minutes), then turn the PUMPING MODE switch to OPERATE position.
4. When the SPECTROMETER TUBE PRESSURE meter shows 0.5 millitorr, pour a little liquid nitrogen into the cold trap. When the pressure is in the green band, fill the trap.
5. Set the transfer PRESSURE control to approximately 9 o'clock (about 20 millitorr).
6. Set the START/VENT switch in the VENT position.
The pump is now ready to be connected to the dewar. If that is what you want to do, make sure the dewar valve is closed, attach dewar to pump test port, put FRONT PANEL SWITCH in START position, pump on the line for a while before opening dewar valve, slowly.
Note that the diffusion pump port will close if the pressure goes above the transfer pressure and the front switch should then be switched to reset and back to start to reopen the valves. Failure to do this will result in the pump evacuating the internal pipes but not the test port and the dewar connected to it.

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