Aside from autoclaves, when you are looking at a refrigerator, freezer, incubator, etc… is there a logical way or a rule of thumb so to speak about how many minimum thermocouples are needed? We can even seperate this question into room validations like Walk-Ins and equipment like the ones described above. Suggestions, templates, and logical reasons are welcome ;o)
DKD Standar according to DIN EN 60068:
Climatic chambers with air circulation systems:
For useful volumes < 2000 ℓ, at least nine measuring locations according to the requirements
of DIN EN 60068-3-5:2002 are to be selected, i.e. the measuring locations
form the corner points and the spatial centre of a cuboid spanning the useful
volume.
For useful volumes ≥ 2000 ℓ, the measuring locations must span a cubic lattice
with a lattice constant of max. 1 m (i.e. the greatest spacing of neighbouring measuring
locations is 1 m).
Climatic chambers without air circulation systems:
The number of measuring locations in the space for the calibration of the useful
volume complies with the requirements of DIN EN 60068-3-5:2002, i.e. measurements
must be made in at least nine locations.
- The effect of loading on the spatial homogeneity should be determined by measurements
in the unloaded and in the loaded state in at least one measuring location
using a typical load of the user or using test bodies. The loading should simulate
the maximum impairment to the spatial equalization of temperature and is to be
described in the calibration certificate. Unless otherwise required by the customer,
the load corresponds at least to 40 % of the useful volume.
During the validation of steam sterilizer auroclave how many thermocouple shoul be take measurements in defined limit? For example 122-125 degree.
It depends from lot of factors. Is it liquid of porous load? We need more informations for concrete answer.
[quote=joksavs]DKD Standar according to DIN EN 60068:
Climatic chambers with air circulation systems:
For useful volumes < 2000 ℓ, at least nine measuring locations according to the requirements
of DIN EN 60068-3-5:2002 are to be selected, i.e. the measuring locations
form the corner points and the spatial centre of a cuboid spanning the useful
volume.
For useful volumes ≥ 2000 ℓ, the measuring locations must span a cubic lattice
with a lattice constant of max. 1 m (i.e. the greatest spacing of neighbouring measuring
locations is 1 m).
Climatic chambers without air circulation systems:
The number of measuring locations in the space for the calibration of the useful
volume complies with the requirements of DIN EN 60068-3-5:2002, i.e. measurements
must be made in at least nine locations.
- The effect of loading on the spatial homogeneity should be determined by measurements
in the unloaded and in the loaded state in at least one measuring location
using a typical load of the user or using test bodies. The loading should simulate
the maximum impairment to the spatial equalization of temperature and is to be
described in the calibration certificate. Unless otherwise required by the customer,
the load corresponds at least to 40 % of the useful volume.[/quote]
Hi, joksavs
I can not find the content you mentioned above in EN 60068-3-5-2002. What I found is the attachment.
<img src=/uploads/db7093/original/1X/36224ba614b5f3d1f43c6bd97f3aec13b964ec4a.jpg">