TA Instruments TMA 2940 CE, Operator'S Manual, Page: 110 / 178

Using Your Options
TA I
NSTRUMENTS
TMA 2940 CE 4–22
To calculate the vial constant from a scan, use
the following equation:
β
ref
• V
K =
(S – B)
where:
K = vial constant (cm
3
/µm)
S = slope (
µ
m/
o
C)
β
ref
= cubic expansion coefficient of
standard material
m
3
m 3 o C
β
ref
= 3
α
ref
Where
α
ref
is the coefficient of
linear expansion of standard
material, (m/m •
o
C), measured
over the same temperature range.
V = sample volume (cm
3
). This volume
may be obtained by dividing the
sample mass in grams by its density
in g/cm
3
at room temperature.
B = slope of baseline (
µ
m/
o
C).
The dilatometer accessory kit contains:
• Dilatometer probe assembly
• Dilatometer sample vial
• Filling medium
• Aluminum calibration standards.
( )