Thermo Scientific DensityPRO, Application Manual

Page: 39 / 101

DensityPRO Setup
Temperature Compensation Setup
6. Ref. Temperature: Enter the reference temperature. The gauge
performs all of its temperature compensation calculations relative to the
reference temperature.
7. Ref Density: The density of a material at the reference temperature is
called its reference density. The density values specified in the Density
Setup menu are used. For example, the carrier gravity and the solids
gravity values are used when the material type is slurry.
8. Coefficients A/B/C for equation 1: If you selected user defined
polynomials, enter three coefficients (A, B, C) for equation 1.
9. Enable/disable temp comp: Choose whether equation 1 will be used
for standardization. If you standardize with the pipe full and the
temperature is different than the reference temperature, the density
during the standardization measurement may be significantly different
from the reference density value (e.g. the carrier gravity for slurry) that
is assumed to correspond to the standardization. To correct for this,
select to use temperature compensation. With this setting, the gauge
uses the process temperature measured at the end of the standardization
cycle and the temperature compensation polynomial to normalize the
standardization measurement to what it would have been at the
reference temperature.
10. Coefficients A/B/C for equation 2: Enter three coefficients (A, B, C)
for equation 2.
11. Temperature error correction: Enter the temperature offset correction.
For example, if the gauge consistently reads 2°C over the actual process
temperature, enter an offset correction of –2°C.
12. Temperature compensation setup is complete. Loop may be returned to
automatic control.
Thermo Fisher Scientific DensityPRO with F
OUNDATION
™ fieldbus Application Guide 4-5