Emerson Rosemount 3051S ERS Reference Manual page 41

Reference Manual
00809-0100-4804, Rev CB
Figure 3-3. Scaled Variable - Level
Table 3-5. Scaled Variable Configuration Option
Variable
Scaled Units
DP
1
Scaled
DP
2
Scaled
Primary variable
LRV (4 mA)
URV (20 mA)
Configuring scaled variable to calculate mass or volume
Fast Keys
To derive a mass or volume calculation from a DP measurement, more than two scaled variable points
may be required depending on the tank shape and geometry. ERS supports three different methods for
configuring scaled variable for mass or volume applications:
Direct: manually configure scaled variable using anywhere from two to 20 points.

Tank formulas: scaled variable will automatically be configured by inputting the tank shape, tank

geometry, and specific gravity of the process.
Strapping table: scaled variable will automatically be configured by inputting a traditional "Level vs.

Volume" strapping table.
Configuration
Specific Gravity
= 0.94
(Minimum DP)
(Level at min. DP)
1
(DP at max level)
(max Level)
2
2, 2, 3, 5, 1
4.5 feet
1.5 feet
Unit
Feet (Meter)
0 inH O ( 0 mmH O)
2 2
1.5 feet (0.46 meter)
50.76 inH O (1289 mmH O)
2 2
6.0 feet (1.83 meters)
Scaled variable
1.5 feet (0.46 meters)
6.0 feet (1.83 meters)
Configuration
November 2016
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