Freezing Process - Fluke 2031A User Manual

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Freezing Process

The freezing process is described in the steps below. The TPW cell and Quick
Stick need to be supported separately during this process. Care must be taken
not to break the entrant tube during this process or the cell is ruined. Use the
Hart model 2031-STND to support the cell and Quick Stick during this
operation.
Figure 2 2031-STND with 2031A and triple
point of water cell
1. Cool the TPW cell in the bath to near the triple point temperature before
freezing. Keep the cell in the bath until you are ready to start the mantle
forming process.
2. Break dry ice into small chunks (less than ¼ inch) appropriate for fitting
into the cup.
3. Dry the reentrant well of the TPW cell with alcohol (ethanol). Place ap-
proximately ¼ inch into the bottom of the reentrant well. Add approxi-
mately 5 ml of finely crushed dry ice to the reentrant well. This will
help start the freezing process and prevent super cooling of the water. A
4 Freezing Process
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