Page 3 of 13 of DA04776924 Weather-Related Variability of Calorimeter Performance in a Poorly- Controlled Environment H NF-332 1 9-FP Revision 0 Wea t he r-re la ted Va ria b i I i ty of Calorimeter Performance in a Poorly-Controlled Environment Prepared

ABSTRACT , Four Antech airbath calorimeters at the Hanford site were studied for three summers and two winters m a location not well-shielded from outside temperature changes. An calorimeters showed significant increases in variability of standard measurements during hot weather. The increased variability is postulated to be due to a low setting of the Peltier cold face temperature, which doesn't allow the instrument to drain heat fast enough in a hot environment. A higher setIing of the Peltier cold face might lead to better performance in environments subjected to a broad range of temperatures