Lever Arm
Torque Plate Stem
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9
15. Screw the other valve stem into the hole in the cell cap and hand tighten.
16. Place the CO
2
assembly onto the top valve stem and secure it in place
with the retaining pin.
17. Unscrew (counter-clockwise) the regulator T-screw until it turns freely.
18. Remove the barrel from the regulator. Place a CO
2
cartridge into the
barrel and tighten the barrel to the puncture head until the cartridge
punctures.
19. Tighten (clockwise) the regulator T-screw until the gauge reads 477.5
PSI (3,292 kPa).
20. Place the 25 mL graduated cylinder under the cell and open the lower
valve stem by turning it counter-clockwise ¼ turn.
21. Make sure the torque plate is up as far as possible by turning and
pulling it upward.
22. Open the top valve stem ¼ turn to initiate filtration. Record the time of
the start of the test.
23. Continue filtration for 10 minutes, or until the desired filtrate volume is
collected.
If the yoke option is being used, filter until the desired cake thickness is
reached (usually 2/32" / 1.6 mm). Refer to page 11 for details.
24. Align the groove in the lever under the column top cross support and
press the torque plate down into the cell. Continue to hold the torque
plate all the way down against the screen until the pressure equalizes
sufficiently to allow the plate to stick. This usually takes about two min-
utes and will require 50 to 80 pounds (23 to 36 kg) of force on the end
of the lever.
