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5.6.4. VRe MICRO CALIBRATION (NO SPHERES, MICRO CELL & MICRO
SLEEVE)
5.6.4.1. PERFORM THE STEPS LISTED IN SECTION 5.4.1. ( THE PURGE ROUTINE )
WITH THE EMPTY MICRO CELL IN PLACE.
5.6.4.2. CLOSE ALL THE TOGGLE VALVES .
5.6.4.3. TURN THE SELECTOR VALVE ON THE FRONT PANEL TO THE CELL
POSITION AND THEN OPEN THE GAS OUT TOGGLE VALVE.
5.6.4.4. TURN THE ZERO ADJUSTMENT KNOB ON THE FRONT PANEL UNTIL A
0.000 PSIG READING IS DISPLAYED ON THE DIGITAL PANEL METER. CLOSE THE
GAS OUT TOGGLE VALVE.
5.6.4.5. TURN THE SELECTOR VALVE TO THE REFERENCE POSITION AND
CLOSE THE GAS OUT TOGGLE VALVE.
5.6.4.6. OPEN THE GAS IN TOGGLE VALVE AND, WHEN THE DIGITAL PANEL
METER READS 17.0 PSIG, CLOSE THE GAS IN TOGGLE VALVE.
5.6.4.7. VERIFY THAT THE PRESSURE DISPLAYED ON THE DIGITAL PANEL
METER DOES NOT CHANGE DURING A 10-SECOND PERIOD. TAKE THE eP1
PRESSURE READING ON THE DIGITAL PANEL METER AND ENTER THAT
NUMBER ON THE INSTRUMENT CALIBRATION SHEET IN APPENDIX B.4, ITEM
B.4.3., AS eP1.
5.6.4.8. TURN THE SELECTOR VALVE ON THE FRONT PANEL TO THE CELL
POSITION.
5.6.4.9. VERIFY THAT THE NEW PRESSURE DISPLAYED ON THE DIGITAL PANEL
METER DOES NOT CHANGE DURING A 10-SECOND PERIOD. TAKE THE eP2
PRESSURE READING ON THE DIGITAL PANEL METER AND ENTER THAT
NUMBER ON THE INSTRUMENT CALIBRATION SHEET IN APPENDIX B.4, ITEM
B.4.3, AS eP2.
.
5.6.4.10. CALCULATE THE RATIO eP1 / eP2 = eP AND ENTER THIS VALUE AS eP
ON THE INSTRUMENT CALIBRATION SHEET IN APPENDIX B.4, ITEM B.4.3.
5.6.4.11. REPEAT THE STEPS IN SECTIONS 5.5.8.2 TO 5.5.8.11 UNTIL FIVE
CONSECUTIVE eP VALUES FALL WITHIN +/-0.0005 OF EACH OTHER.
5.7. VCf MICRO CALIBRATION ( 2.145 cc, TWO MICRO SPHERES )
5.7.1. INSTALL TWO MICRO 1.0725 cc SPHERES, THEIR CUP AND SLEEVE IN THE
CELL HOLDER. PERFORM THE STEPS LISTED IN SECTION 5.5.1. ( THE PURGE
ROUTINE) WITH THE CELL HOLDER FILLED AS INDICATED ABOVE.
5.7.2. CLOSE ALL THE TOGGLE VALVES.
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