Emerson Rosemount 3051S Reference Manual page 42

Rosemount 3051S ERS System
Figure 3-4. Scaled Variable -
Direct Method Example
3-10
NOTE:
The values entered for each successive DP and Scaled Variable pair must be
greater than or equal to the previous pair.
5. The ERS system will not be able to calculate mass or volume if the
process is below the P
configuration needs to be adjusted to account for the mounting location
of P sensor, you can enter in an offset:
HI
a. No Offset: the Scaled Variable configuration defined in Steps 3 and 4
already accounts for the mounting location of the P
b. Offset A: Adjust the Scaled Variable configuration by providing the
height of the P
HI
the specific gravity of the process.
c. Offset B: Adjust the Scaled Variable configuration by defining how
much mass or volume is located below the P
define how much scaled output is present when the ERS system is
reading "0 DP").
6. If an offset was used in step 5, a new Scaled Variable configuration will
automatically be created which accounts for the mounting location of the
P transmitter.
HI
50 in. H20 = 300 GALNS
20 in. H20 = 50 GALNS
15 in. H20 = 30 GALNS
0 in. H20 = 15 GALNS
pressure tap. If the Scaled Variable
HI
pressure tap (relative to the bottom of the vessel) and
Scaled Variable Configuration
1. Scaled Units
2. # of Scaled Points
3. DP
1
Scaled
1
4. DP
2
Scaled
2
DP
3
Scaled
3
DP
4
Scaled
4
5. Offset
6. Primary Variable
LRV (4 mA)
URV (20 mA)
Reference Manual
00809-0100-4804, Rev AA
January 2011
transmitter.
HI
pressure tap (this will
HI
GALNS (LITER)
4
0 inH 0 (0 mmH 0)
2 2
15 GALNS (57 LITER)
15 inH 0 (381 mmH 0)
2 2
30 GALNS (114 LITER)
20 inH 0 (508 mmH 0)
2 2
50 GALNS (189 LITER)
50 inH 0 (1270 mmH 0)
2 2
300 GALNS (1136
LITER)
No Offset
Scaled Variable
15 GALNS (57 LITER)
50 GALNS (189 LITER)