Answer: There are many ways to address this issue. Our current recommendation is to fill the casing with a water + propylene glycol solution. Propylene glycol is a non-toxic antifreeze fluid. Although this solution should be harmless, always wash off the probe and cable after use.
Here is a table showing the freezing point for various solutions. The table is provided by engineeringtoolbox.com.
| FREEZING POINT - PROPYLENE GLYCOL AND WATER SOLUTIONS | ||||||||
|---|---|---|---|---|---|---|---|---|
| % Solution by mass | 0 | 10 | 20 | 30 | 40 | 50 | 60 | |
| Temperature | F | 32 | 26 | 18 | 7 | -8 | -29 | -55 |
| C | 0 | -3 | -8 | -14 | -22 | -34 | -48 | |
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