Berthold LB 444 - Square Temperature Coefficient

Density Meter LB 444 SECTION 6. BASICS OF DENSITY MEASUREMENTS
58
6.1.1.2 Square Temperature Coefficient
a) To calculate the square coefficients, one first has to calculate the linear coef-
ficient, starting from the reference temperature (here: lowest temperature), as
described above. The initial temperature should match the lowest product
temperature.
b) After calculation of the linear coefficient with enabled temperature compen-
sation, increase the product temperature further by at least 40 to 50°C.
c) From the resulting change in reading and the associated temperature change
one then calculates the square coefficient TC
2
:
( )
TC = -
-
-
2
AD
2
ρ
ρ
ζζ
1
2
ρ
A
= Actual density value (table value or lab value at this temperature)
ρ
D
= Displayed density value
ζ
1
= Original temperature (in our example 10°C)
ζ
2
= Temperature at ρ
D
d) Enter the calculated value at TC
2
. Now the originally noted density or con-
centration value must be obtained again.