Emerson FISHER FIELDVUE DLC3010 Instruction Manual page 38

DLC3010 Digital Level Controller
Configuration
May 2018
4. Select the measurement application (liquid level, interface level, or liquid density).
Note
For interface applications using standard hardware, if the 249 is not installed on a vessel, or if the cage can be isolated, calibrate
the instrument with weights, water, or other standard test fluid, in level mode. After calibrating in level mode, the instrument can
be switched to interface mode. Then, enter the actual process fluid specific gravity(s) and range values. For an interface
application with an overweight displacer, see the section of this manual on "Calibration with an Overweight Displacer".
If the 249 sensor is installed and must be calibrated in the actual process fluid(s) at operating conditions, enter the final
measurement mode and actual process fluid data now.
Figure 4‐2. Method of Determining Moment Arm from External Measurements
VERTICAL C
L
OF DISPLACER
a. If you choose "Liquid Level" or "Interface Level," the default process variable units are set to the same units
chosen for displacer length. You are prompted to key in the level offset. Range values will be initialized based on
Level Offset and displacer size. The default upper range value is set to equal the displacer length and the default
lower range value is set to zero when the level offset is 0.
b. If you choose "Liquid Density," the default process variable units are set to "SGU" (Specific Gravity Units). The
default upper range value is set to "1.0" and the default lower range value is set to "0.1".
5. Select the desired output action: Direct or Reverse
Choosing "reverse acting" will swap the default values of the upper and lower range values (the process variable values
at 20 mA and 4 mA). In a reverse acting instrument, the loop current will decrease as the process variable value
increases.
6. You are given the opportunity to modify the default value for the process variable engineering units.
7. You are then given the opportunity to edit the default values that were entered for the upper range value (PV Value
at 20 mA) and lower range value (PV Value at 4 mA).
8. The default values of the alarm variables will be set as follows:
Direct‐Acting Instrument
(Span = Upper Range Value - Lower Range Value
Alarm Variable Default Alarm Value
Hi‐Hi Alarm Upper Range Value
Hi Alarm 95% span + Lower Range Value
Lo Alarm 5% span + Lower Range Value
Lo‐Lo Alarm Lower Range Value
38
VESSEL
HORIZONTAL C
L
OF TORQUE TUBE
MOMENT
ARM LENGTH
(Span = Lower Range Value - Upper Range Value
Alarm Variable
Hi‐Hi Alarm
Hi Alarm
Lo Alarm
Lo‐Lo Alarm
Instruction Manual
Reverse‐Acting Instrument
Default Alarm Value
Lower Range Value
95% span + Upper Range Value
5% span + Upper Range Value
Upper Range Value
D102748X012