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CBS has tested a V-1500 AB Isothermal Freezer to determine how long it will take after the level reaches 0.0" to reach a temperature of -150 degrees Celsius. To do this CBS monitors lid temperature probe location at the top storage box or top bag canister. This test used a 4 foot transfer hose, liquid cylinder supply tank, and a 22 psi relief valve.Our results were as follows:
| Date/Time |
LN2 Level (Inches) |
Temperature (Degrees C) |
Temp. Difference ( in Degrees) |
| 01/25/08 20:00 |
0.1" |
-174 |
0 |
| 01/25/08 21:00 |
0.0" |
-173 |
1 |
| 01/25/08 22:00 |
0.0" |
-173 |
0 |
| 01/25/08 23:00 |
0.0" |
-173 |
0 |
| 01/26/08 00:00 |
0.0" |
-173 |
0 |
| 01/26/08 01:00 |
0.0" |
-172 |
1 |
| 01/26/08 02:00 |
0.0" |
-172 |
0 |
| 01/26/08 03:00 |
0.0" |
-172 |
0 |
| 01/26/08 04:00 |
0.0" |
-172 |
0 |
| 01/26/08 05:00 |
0.0" |
-171 |
1 |
| 01/26/08 06:00 |
0.0" |
-171 |
0 |
| 01/26/08 07:00 |
0.0" |
-171 |
0 |
| 01/26/08 08:00 |
0.0" |
-171 |
0 |
| 01/26/08 09:00 |
0.0" |
-171 |
0 |
| 01/26/08 10:00 |
0.0" |
-170 |
1 |
| 01/26/08 11:00 |
0.0" |
-170 |
0 |
| 01/26/08 12:00 |
0.0" |
-170 |
0 |
| 01/26/08 13:00 |
0.0" |
-169 |
1 |
| 01/26/08 14:00 |
0.0" |
-169 |
0 |
| 01/26/08 15:00 |
0.0" |
-169 |
0 |
| 01/26/08 16:00 |
0.0" |
-168 |
1 |
| 01/26/08 17:00 |
0.0" |
-168 |
0 |
| 01/26/08 18:00 |
0.0" |
-168 |
0 |
| 01/26/08 19:00 |
0.0" |
-167 |
1 |
| 01/26/08 20:00 |
0.0" |
-166 |
1 |
| 01/26/08 21:00 |
0.0" |
-165 |
1 |
| 01/26/08 22:00 |
0.0" |
-163 |
2 |
| 01/26/08 23:00 |
0.0" |
-162 |
1 |
| 01/27/08 00:00 |
0.0" |
-161 |
1 |
| 01/27/08 01:00 |
0.0" |
-160 |
1 |
| 01/27/08 02:00 |
0.0" |
-159 |
1 |
| 01/27/08 03:00 |
0.0" |
-158 |
1 |
| 01/27/08 04:00 |
0.0" |
-157 |
1 |
| 01/27/08 05:00 |
0.0" |
-156 |
1 |
| 01/27/08 06:00 |
0.0" |
-156 |
0 |
| 01/27/08 07:00 |
0.0" |
-155 |
1 |
| 01/27/08 08:00 |
0.0" |
-154 |
1 |
| 01/27/08 09:00 |
0.0" |
-154 |
0 |
| 01/27/08 10:00 |
0.0" |
-153 |
1 |
| 01/27/08 11:00 |
0.0" |
-153 |
0 |
| 01/27/08 12:00 |
0.0" |
-152 |
1 |
| 01/27/08 13:00 |
0.0" |
-152 |
0 |
| 01/27/08 14:00 |
0.0" |
-152 |
0 |
| 01/27/08 15:00 |
0.0" |
-151 |
1 |
| 01/27/08 16:00 |
0.0" |
-151 |
1 |
| 01/27/08 17:00 |
0.0" |
-150 |
0 |
| 01/27/08 18:00 |
0.0" |
-150 |
0 |
| 01/27/08 19:00 |
0.0" |
-150 |
0 |
| Total: 46 Hours |
0.0" |
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+24 Degree change |
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