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5.4.2. MICRO REFERENCE
5.4.2.1. FOLLOWING A SUITABLE PURGE (SEE ITEM 5.4.1.1), INSTALL THE
MICRO SAMPLE CELL AND SLEEVE WITH TWO MICRO STAINLESS STEEL
BALLS INTO THE CELL HOLDER AND CLOSE THE COVER. PURGE THE
INSTRUMENT FOR AN ADDITIONAL MINUTE TO REMOVE ALL AIR WITHIN IT.
5.4.2.2. CLOSE THE TOGGLE VALVES I, II AND GAS IN.
5.4.2.3. TURN THE SELECTOR VALVE ON THE FRONT PANEL TO THE CELL
POSITION AND THEN OPEN THE GAS OUT TOGGLE VALVE.
5.4.2.4. TURN THE ZERO ADJUSTMENT KNOB ON THE FRONT PANEL UNTIL A
0.000 PSIG READING IS DISPLAYED ON THE DIGITAL PANEL METER.
5.4.2
.
5. TURN THE SELECTOR VALVE TO THE REFERENCE POSITION AND
CLOSE THE GAS OUT TOGGLE VALVE.
5.4.2.6. OPEN THE GAS IN TOGGLE VALVE AND, WHEN THE DIGITAL PANEL
METER READS 19.0 PSIG, CLOSE THE GAS IN TOGGLE VALVE.
5.4.2.7. RECORD THE FIRST STABLE READING AS THE STARTING PRESSURE
AND ENTER THAT READING ON THE INSTRUMENT CHECK SHEET IN APPENDIX
B.1, ITEM B.1.3.7. AS THE STARTING PRESSURE FOR MICRO. THIS WILL SIGNAL
THE BEGINNING OF A 1 MINUTE LEAK TEST.
5.4.2.8. AFTER 1 MINUTE HAS ELAPSED, RECORD THE READING AS DISPLAYED
ON THE DIGITAL PANEL METER AND ENTER THAT READING AS PRESSURE
AFTER 1 MINUTE FOR MICRO ON THE INSTRUMENT CHECK SHEET IN
APPENDIX B.1, ITEM B.1.3.7. THE CALCULATED LEAK RATE MUST BE NO
GREATER THAN 0.004 PSIG IN ONE MINUTE BEFORE PROCEEDING.
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