22
5.6.3. SMALL SPHERE RUN
5.6.3.1. INSTALL ONE SMALL SPHERE (7.0699 cc) AND TWO MICRO SPHERES
(2.145 cc) IN THE SAMPLE CELL CUP. ( THIS IS EQUIVALENT TO FILLING THE
SMALL CUP WITH THE SPHERE INDICATED AS THE SAMPLE.) PLACE THE
SAMPLE CELL CUP INTO ITS SLEEVE AND THEN THE SLEEVE INTO THE CELL
HOLDER. PERFORM THE STEPS LISTED IN SECTION 5.6.1. (THE PURGE
ROUTINE) WITH THE SMALL CELL FILLED.
5.6.3.2. CLOSE ALL THE TOGGLE VALVES. OPEN THE TOGGLE VALVE II.
5.6.3.3. TURN THE SELECTOR VALVE ON THE FRONT PANEL TO THE CELL
POSITION
AND THEN OPEN THE
GAS OUT TOGGLE VALVE.
5.6.3.4. 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.
5.6.3.5. TURN THE SELECTOR VALVE TO THE REFERENCE
POSITION
AND
CLOSE THE GAS OUT TOGGLE VALVE.
5.6.3.6. OPEN THE GAS IN TOGGLE VALVE AND, WHEN THE DIGITAL PANEL
METER READS 17.0 PSIG, CLOSE THE GAS IN TOGGLE VALVE.
5.6.3.7. VERIFY THAT THE PRESSURE DISPLAYED ON THE DIGITAL PANEL
METER DOES NOT CHANGE DURING A 10-SECOND PERIOD. TAKE THE
P1
PRESSURE READING ON THE DIGITAL PANEL METER AND ENTER THAT
NUMBER ON THE SMALL SPHERE RUN DATA SHEET (APPENDIX C, ITEM C.1.3.).
.
5.6.3.8. TURN THE SELECTOR VALVE ON THE FRONT PANEL TO THE CELL
POSITION.
5.6.3.9. VERIFY THAT THE NEW PRESSURE DISPLAYED ON THE DIGITAL PANEL
METER DOES NOT CHANGE DURING A 10-SECOND PERIOD. TAKE THE
P2
PRESSURE READING ON THE DIGITAL PANEL METER AND ENTER THAT
NUMBER ON THE SMALL SPHERE RUN DATA SHEET (APPENDIX C, ITEM C.1.3.).
5.6.3.10. CALCULATE VP = VC - VR
×
((P1/P2) -1), WITH NUMBERS FOR VC AND
VR TAKEN FROM THE CALIBRATION SECTION. VERIFY THAT THE
CALCULATED VALUES ARE WITHIN 0.7 % OF THE EXPECTED VOLUME OF
9.2149 cc. THE UPPER LIMIT IS 9.2794 cc AND THE LOWER LIMIT IS 9.1504 cc