Advertisement
Standardization
with Temperature
Compensation
Temperature
Compensation
during Calibration
Thermo Scientific
When Use Temp Comp during STD is set to Yes the density will be compensated for
temperature if the standardization is done with the pipe full.
The density during standardization (Cal Density Point #1) will be the density of the
process at the reference temperature. Internally, the gauge will store the density at the
process temperature. This will be at a location other than the modbus register.
The gauge will use the temperature compensation input source selected by the user to
determine the process temperature during standardization. At the end of the
standardization, the temperature from the temperature compensation input source
chosen by the user will be saved. Before the temperature is saved, it is corrected with
the Temperature Offset Correction.
Equation 36
–
Tstored – The temperature value stored during the standardization and/or
calibration cycle.
–
Tinput – The temperature for the user-selected input, determined by selecting Not
Used, Manual Value, Detector RTD Input or Detector 4-20 mA Input as the
Temperature Input Source.
–
Toffset – The value entered by the user for Temperature Offset Correction. This is
a quick way to correct temperature offset. Normally when the RTD or current
input is calibrated, the Temperature Offset Correction is not needed and can be
set to zero.
Temperature compensation is enabled by selecting a Temperature Input Source other
than Not Used. When temperature compensation is enabled, the gauge will use the
temperature input source selected by the user to determine the process temperature
during calibration. At the end of the calibration, the temperature from the temperature
compensation input source selected by the user will be saved in Calibration
Temperature. Before the temperature is saved, it is corrected with Temperature Offset
Correction value as described in Standardization with Temperature Compensation.
The density values entered for Cal Density Point #1 and Cal Density Point #2 are the
density at the reference temperature.
The density measured during calibration will be at the process temperature. Internally,
the gauge will store the value of the density at the process temperature for calibration
point 1 and calibration point 2. This will be in a location other than the modbus
register.
Density Calculation
Temperature Compensated Density
DensityPRO User Manual
C-33
Advertisement
