Density Meter LB 444 SECTION 6. BASICS OF DENSITY MEASUREMENTS
66
1. No correction is required if the density has been determined at exactly the
same temperature at which the countrate was read in (e.g. density meters
at site). The density value determined can be read in directly.
In this case, the temperature compensation is turned on only
after
the cali-
bration has been performed.
2. Manual correction of the sample values is required only if the measurement
was run in g/cm
3
and the density of the samples was determined at different
temperatures.
Carry out the correction as follows:
ρ
C
= ρ
M
- (ζ
P
- ζ
M
) · TC
1
ρ
C
= corrected input value
ρ
M
= measured density value
ζ
P
= product temperature during density determination
ζ
M
= reference temperature
TC
1
= temperature coefficient
The display always relates to ζ
M
.
Example: Temperature coefficient = 0.5 · 10
-3
ρ
ρρ
ρ
M
in g/cm
3
ζ
ζζ
ζ
P
in °C
ζ
ζζ
ζ
M
in °C
ρ
ρρ
ρ
C
in g/cm
3
1.30 75 70 1.2975
1.32 70 70 1.3200
1.35 65 70 1.3750
Since in this case the correction has already been done manually, the tempera-
ture compensation must be turned off and then on again in the instrument con-
figuration.
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