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Abstract
prepare small mercury cells for the realization of the triple
point of mercury on the ITS-90 , for the calibration purpose
of a small temperature
sensors which are widely used in
research work and in industry.The cells for the realization of
ITS-90 must be prepared from very high purity materials .For
this purpose the mercury used for filling
cells
purified by using chemical technique followed by distillation
under vacuum. Two cells were prepared
for the
realization of mercury triple point and the other for the
reJ3.11zation of the mercury melting point
A comparison between MI5 triple point cell and the
CO””” 1 1 -F ~ 1 l.::.rl
_’ ~_ • ....L. -L ..1~ .J_ .! . ..L ~_. ”_’I.
with standard sample
f r om
standards and Technology U.S.A ( NIST) was carried out.
The triple point temperature of pure mercury for the
° 0
prepared cell is( -38.8329 C +.0007 C) and that for NIST
cell is (-38.8339
o 0
C + 0.0007 C) .
good
These results are in
agreement with each other and with its adopted value on
ITS - 90 which is (- 38,8344 °C)(l) .
In the present work a thermistor previously calibrated
.