Emerson FISHER FIELDVUE DLC3010 Instruction Manual page 41

Instruction Manual
D102748X012
Torque Tube
D TT Material displays the torque tube material currently stored in the instrument.
Note
A sensor with an N05500 torque tube may have NiCu on the nameplate as the torque tube material.
D Change Material— selecting a material in this procedure loads the default torque rate temperature compensation
for the specified torque tube material.
D Edit Compensation
TT Compensation— Each temperature-coefficient data pair may be edited.
Torque Comp Plot displays a graph of the compensation table.
Pre-compensate Torque Rate— The stiffness of the torque tube varies with process temperature. The firmware
does not implement dynamic temperature compensation of the torque rate. However, the compensation tables
for this effect are stored in the device. The "Pre-compensate Torque Rate" procedure allows you to apply a fixed
compensation factor, based on the target process temperature, to the torque rate value stored in the instrument.
For example, if the sensor was calibrated at 70_F or a theoretical torque rate valid at 70_F was manually entered in
the configuration, but the target process operating condition is 375_F, this procedure will compute an appropriate
correction factor from the table for the selected torque tube material, and modify the stored torque rate by that
factor. The calibration should then be more accurate at the target process temperature (with a corresponding
degradation at 70_F). It is recommended that you document this action by entering appropriate text in the
Description and/or Message fields of the device configuration, to facilitate reversing the compensation later, and to
help prevent it from being applied twice.
D Torque Rate displays the torque rate currently stored in the instrument.
D Change Torque Rate applies a rough, theoretical calibration to the torque tube when manipulation of the input is
impossible
Instrument Mounting
Specify whether the instrument is mounted to the right or left of the displacer. See figure 2‐5.
Note
While facing DLC3010 Display, report whether DLC3010 is mounted to left or right of displacer. This determines positive sense of
torque tube rotation for increasing buoyancy.
Sensor Damping
Configure the input filter.
Time constant for the input filter, in seconds, for the A/D measurement. The filter is applied before PV processing,
after the A/D conversion. Range is 0 to 16 seconds in 0.1 second increments. The default value is 0.0 seconds. To
disable the filter, set the time constant to 0 seconds. This filter is provided for extreme input noise situations. Use of
this filter normally should not be necessary.
Net instrument response is a combination of analog input filtering, sensor damping, PV damping, and output filtering.
DLC3010 Digital Level Controller
Configuration
May 2018
41