37
Reference Manual
00809-0200-4840, Rev BA
December 2014
Section 4: Configuration
Figure 4-1. Tank geometry
Data processing sequence:
1.
Echoes are processed that occur between
Upper Blanking
(
P023
) and
Lower Blanking
(
P063
).
2.
D910 is derived from the Target Echo’s Time of Flight and the calculated Speed of
Sound: D910 = (Time of Flight x Speed of Sound) / 2
3.
D902 = (D910 - P060)
4.
Liquid Level = (P010 - D902)
5.
D901 = (Liquid Level + P069)
Abbreviations:
TRP= Tank Reference Point
SRP = Sensor Reference Point
UPSRP = User Preferred SRP
4–20mA/HART
Rosemount
3107 or 3108
Rosemount
3490 Series
SRP
Zero
Level
Bottom
Reference
(P010)
Lower
Blanking
(P063)
Upper
Blanking
(P023)
Dis
tanc
e
(D9
10)
Le
v
e
l SV (
D
901)
D
is
tanc
e
T
V
(D9
02)
Level
Offset
(P069)
Distance Offset
(P060)
TRP
UPSRP
Liq
u
id L
e
v
e
l
Содержание 3107
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