| Author | Message | ||
     Kenneth Gallaher (ken_g) New member Username: ken_g Post Number: 1 Registered: 7-2006 |
At best you can expect a typical office environment to be controlled within +/- 3 degrees C. A poor mans envirochamber is in fact to use the room heating cooling system - along with a space heater if needed. Your fellows may hate you - or think you are wacko - but it works for a rough test. Better yet control things - always better to remove NIR variables rather than fudge for them. BTW what do others think of the emea document? It has a strong bias against PCR. | ||
| Howard Mark (hlmark) Senior Member Username: hlmark Post Number: 46 Registered: 9-2001 |
The ultimate test would be to put the instrument into an environmental chamber, if you have one available to you, and measure the performance (including any bias) caused by different conditions. If that is not an option (as I expect would be the case for most of the members of the discussion) then you could get, relatively inexpensively, a thermometer and a hygrometer and monitor the conditions in your laboratory. Between summer and winter you would expect to see humidity changes, although a good heating and air-conditioning system should keep the temperature pretty constant. Then you could monitor performance over at least the normal changes you encounter in your laboratory. If I recall correctly, the environmental changes come under the heading of "robustness", for which at least some agencies do not require be determined at the time the instrument is put into use, but may be determined at a later time. This allows you to explore your system's behavior over a time period long enough for the "natural" changes in environment to show up. Howard \o/ /_\ | ||
| Michel Coene (michel) Senior Member Username: michel Post Number: 38 Registered: 2-2002 |
What is your application? If you run the experiments in an environment where ambient temperature and humidity are strictly controlled, I would say you have that part under control... | ||
| Gerard O'Neill (ger) New member Username: ger Post Number: 1 Registered: 8-2006 |
In the EMEA directive on NIR http://www.emea.eu.int/pdfs/human/qwp/330901en.pdf in section 2.3 it states the effects of variations eg temperature (environment and sample), humidity etc etc should be understood and documented. Can any guide me as to how I could ensure I comply to this note for guidance???? especiall with regard to temperature and humidity? |