cold room validation

Dear colleagues

I have a request from a customer concerning the validation of a cold room with a size greater than 20m3. To validate the temperature, the norm NF X 15-140 specifies 15 sensors for a volume between 2 to 20 m3.

But above 20 m3, how can we do ?

Thanks in advance for your feedback

there is no hard and fast rule that these many have to be placed. I have seen only references till date that there should be like this. It depends on your risk assessment considering all the factors like location of supply, height etc where you place sensor for mapping.