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5.4. LEAK TEST
5.4.1. PURGE
5.4.1.1. THE PROCEDURE TO PURGE THE INSTRUMENT (BY FLOWING HELIUM
TO REMOVE CONTAMINANTS) NEEDS TO BE PERFORMED PRIOR TO TESTING
NEW INSTRUMENTS AND INSTRUMENTS THAT HAD BEEN TURNED OFF FOR
MORE THAN ONE DAY. THERE IS NO NEED TO REPEAT THIS PROCEDURE
BETWEEN THE CELL AND REFERENCE CALIBRATIONS.
5.4.1.2. INSTALL THE TWO MICRO STAINLESS STEEL BALLS INTO THE SAMPLE
CELL AND THEN THE SAMPLE CELL INTO THE MICRO SLEEVE. PLACE THE
FILLED SLEEVE INTO THE CELL HOLDER AND THEN CLOSE THE CELL HOLDER
COVER. SET GAS IN NEEDLE VALVE TO 0 BY ADJUSTING KNOB AND SET
SCREW.
5.4.1.3. OPEN THE GAS OUT TOGGLE VALVE AND THE GAS OUT NEEDLE
VALVE.
5.4.1.4. SET THE SELECTOR VALVE TO THE CELL POSITION.
5.4.1.5. OPEN BOTH TOGGLE VALVES I AND II ON THE FRONT PANEL.
5.4.1.6. OPEN THE GAS IN TOGGLE VALVE AND ADJUST THE GAS IN NEEDLE
VALVE FOR A 1 PSIG PURGE RATE AS DISPLAYED ON THE DIGITAL PANEL
METER.
5.4.1.7. PURGE THE MULTIPYCNOMETER FOR 30 MINUTES BEFORE
CONTINUING TO STEP 5.4.2. CLOSE THE GAS IN TOGGLE VALVE WHEN THE
PURGE TIME IS COMPLETED.
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