How to Move the Leak Detector
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Verify Proper Operation
It doesn't make any sense to move a detector that is not functioning.
With the calibrated leak installed, turn the mode select handle to the
START position. When the thermocouple vacuum gauge on the leak detector
indicates less than 100 mTorr, move the mode select handle to the TEST
position. Observe that the LEAK RATE indication decreases when the calibrated
leak valve is shut. Ensure that the calibrated leak valve is left open
upon completion of the test.
Move the Leak Detector
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Ensure test port is plugged with either the calibrated leak or a blank
plug.
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Move Mode Select Handle clockwise from TEST to VENT position. If already
in vent position, take no action.
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Turn off Filament
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Turn off power to Electronics - switch is marked ELECT
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Move Mode Select Handle clockwise from VENT to START position
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While in START position, unplug power cord at wall outlet - this will remove
power to both the leak detector and the roughing pump
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IMMEDIATELY move the leak detector to the new desired location and plug
the power cord into an outlet that can accommodate the 15 to 20 amps required.
*
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Observe the thermocouple gauge on the front panel of the leak detector.
When the pressure drops below 100 mTorr, move the Mode Select Handle to
the TEST position.
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Turn on the power to the electronics - switch marked ELECT.
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Turn on the filament **
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Test the detector as before. If response is poor, allow 20 minutes before
attempting to tune the detector.
* While moving the leak detector, we rely on the residual heat in the small
air cooled diffusion pump to maintain the high vacuum in the spectrometer
tube, thus prolonged delay can spoil the spec tube vacuum and contaminate
the tube elements.
** If the filament does not light, turn the emission knob counter-clockwise
and try again.
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Last updated: 27 Jun 98
Send any comments to: pbarber@mailer.fsu.edu