sree1805
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India,
2014-08-02 06:10
(3526 d 07:52 ago)

Posting: # 13333
Views: 3,845
 

 temperature range of freezers [GxP / QC / QA]

Hi!
in case of the deep freezers (-20 degree celsius) some of them use the freeze -20 plus or minus 10 and some of them use plus or minus 8 and some in plus or minus 5.

I want to know on what basis the plus or minus 5/8/10 is decided to run the freezers.


Edit: Category changed. [Helmut]
Helmut
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Vienna, Austria,
2014-08-02 15:24
(3525 d 22:38 ago)

@ sree1805
Posting: # 13334
Views: 3,040
 

 temperature range of freezers

Hi sree1805,

❝ in case of the deep freezers (-20 degree celsius) some of them use the freeze -20 plus or minus 10 and some of them use plus or minus 8 and some in plus or minus 5.


Amazing what »some of them« do. Are you talking about household-freezers? Lab-freezers generally maintain the temperature at -20 °C to ±1 °…

❝ I want to know on what basis the plus or minus 5/8/10 is decided to run the freezers.


I guess you don’t want samples to thaw? Following table gives the cumulative time during one year to expect the temperature to be ≥ 0 °C:

 x   SD   time     
───────────────────
-20  10   8 days   
-20   8  54 hours  
-20   5  17 minutes


I hope »they« have both an alarm system and a quick chain of responses in place.

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