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11. Make sure the arrow on the cell cap lines up with the arrow on the cell
body and slowly push the cell cap into the cell. Ensure that the o-ring
does not slip out of the o-ring groove during insertion of the cell cap. Not
attaching or tightening the valve stem makes this operation easier.
12. Use the Allen wrench to tighten the six locking set screws into the cell and
secure the cell cap in place. Use hand-touch to make sure that all of the
set screws are completely tightened. The cell may become permanently
stuck inside the heating jacket if one or more set screws are left protrud
-
ing from the cell.
13. Install a valve stem into the cell cap and tighten completely with a wrench.
14. Hold the valve stem and place the cell in the heating jacket with the outlet
(filter) side of the cell pointed down. Using the wrench, rotate the cell
inside the heating jacket so that the pin in the bottom of the heating well
seats into the hole in the bottom of the test cell. This will anchor the cell
in the well and prevent it from rotating as the valve stems are opened and
closed. Check the inlet and outlet valve stems with a wrench to ensure
they are tight.
15. Move the thermometer from the heating jacket to the hole in the test cell.
The heating time of the sample should take exactly one hour. Set a timer
to 60 minutes and begin the test at this time.
Do not initiate filtration when the thermometer first indicates the desired
temperature has been reached. The fluid inside the cell may not have
yet reached the proper temperature. An api funded project found that for
most fluids, it usually takes upwards of an hour for the fluid inside the cell
to reach the target temperature. If accurate temperature measurement is
required during the heating portion of the test, a thermocouple assembly
(#171-45-1) is available which will directly and accurately measure the
fluid temperature inside the cell.
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