Instruction Manual
D102748X012
DLC3010 Digital Level Controller
Configuration
May 2018
47
Level, use a test level near 100% when measuring SG. If the actual process application is interface, the best
differential SG measurement will be obtained at 50% interface level. Follow the prompts on the Field Communicator
and the following procedure to measure specific gravity:
1. Set the control loop for manual control.
2. Adjust the liquid level as close as possible to the optimum value discussed above.
3. Enter the externally measured level, in engineering units.
After you press OK on the Field Communicator, the instrument begins calculating the specific gravity. You can
then elect to use this value as the specific gravity for all level measurements. If you select
No
, the instrument uses
the specific gravity entered under PV Setup, or the values from the specific gravity tables.
4. When finished measuring specific gravity, return the control loop to automatic control.
View/Edit SG Tables
allows you to review or edit the configuration of density temperature compensation.
Load Steam Tables
is only visible if PV is Interface Level.
Table 4‐3 lists example entries for saturated steam. Figure 4‐5 is the curve that results when these values are
plotted.
Table 4‐3. Example Specific Gravity vs Temperature Table for Saturated Steam
Data Point
Temperature
Specific Gravity
_
C
_
F
1
2
3
4
5
126.7
210.0
271.1
304.4
326.7
260
410
520
580
620
0.00095
0.00850
0.02760
0.04900
0.07200
6
7
8
9
10
343.3
357.8
365.6
371.1
374.4
650
676
690
700
706
0.09800
0.13500
0.16800
0.21000
0.31570
Figure 4‐5. Example Saturated Steam Curve Plotted from Values in Table 4‐3
0.0
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0
100
200
300
400
500
600
700
SPECIFIC GRAVITY
TEMPERATURE
_
F
-18
100
200
300
375
TEMPERATURE
_
C
E0370
