Emerson FISHER FIELDVUE DLC3010 Instruction Manual page 47

Instruction Manual
D102748X012
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
1
2
3
4
5
6
7
8
9
10
Figure 4‐5. Example Saturated Steam Curve Plotted from Values in Table 4‐3
-18
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.0
0 100
E0370
_C
126.7
210.0
271.1
304.4
326.7
343.3
357.8
365.6
371.1
374.4
TEMPERATURE _C
100 200
200 300 400 500
TEMPERATURE _F
Temperature
_F
260
410
520
580
620
650
676
690
700
706
300 375
600 700
DLC3010 Digital Level Controller
Configuration
Specific Gravity
0.00095
0.00850
0.02760
0.04900
0.07200
0.09800
0.13500
0.16800
0.21000
0.31570
May 2018
47