24
5.7.3. TURN THE SELECTOR VALVE ON THE FRONT PANEL TO THE CELL
POSITION
AND THEN OPEN THE
GAS OUT TOGGLE VALVE.
5.7.4. 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.
5.7.5. TURN THE SELECTOR VALVE TO THE REFERENCE
POSITION
AND
CLOSE THE GAS OUT TOGGLE VALVE.
5.7.6. OPEN THE GAS IN TOGGLE VALVE AND, WHEN THE DIGITAL PANEL
METER READS 17.0 PSIG, CLOSE THE GAS IN TOGGLE VALVE.
5.7.7. VERIFY THAT THE PRESSURE DISPLAYED ON THE DIGITAL PANEL
METER DOES NOT CHANGE DURING A 10-SECOND PERIOD. TAKE THE
fP1
PRESSURE READING ON THE DIGITAL PANEL METER AND ENTER THAT
NUMBER ON THE INSTRUMENT CALIBRATION SHEET IN APPENDIX B.4, ITEM
B.4.7., AS fP1.
5.7.8. TURN THE SELECTOR VALVE ON THE FRONT PANEL TO THE CELL
POSITION
.
5.7.9. VERIFY THAT THE NEW PRESSURE DISPLAYED ON THE DIGITAL PANEL
METER DOES NOT CHANGE DURING A 10-SECOND PERIOD. TAKE THE
fP2
PRESSURE READING ON THE DIGITAL PANEL METER AND ENTER THAT
NUMBER ON THE INSTRUMENT CALIBRATION SHEET IN APPENDIX B.4, ITEM
B.4.7, AS fP2.
5.7.10. CALCULATE THE RATIO fP1 / fP2 = fP AND ENTER THIS VALUE AS fP
ON THE INSTRUMENT CALIBRATION SHEET IN APPENDIX B.4, ITEM B.4.7.
5.7.11.
REPEAT THE STEPS IN SECTIONS 5.5.9.2 TO 5.5.9.11 UNTIL FIVE
CONSECUTIVE fP VALUES FALL WITHIN +/-0.0005 OF EACH OTHER.
5.8.
CALCULATION OF VR MICRO AND VC MICRO VOLUMES
5.8.1. FILL IN THE CORRESPONDING CALCULATION SHEET ON APPENDIX
B.4.,
ITEMS B.4.11 AND B.4.12.
VR MICRO = 2.145 cc
= 2.145
(e - 1) - (f - 1 ) (e - f )
VC MICRO = VR MICRO
×
( e - l )