Reference Manual
00809-0100-4841, Rev. AA
May 2007
4-27
Rosemount 3490 Series
Table 4-7. Default 20-point
Look-up Table Values (P115)
Notes:
• It is not necessary to define all points. However, an X value of 0.0
terminates the profile (unless it is point X0, Y0).
• Whilst editing, the ESC button can be used to abort editing and restore
the original value; it needs to be pressed again to move back to the 'X' or
'Y' text.
Figure 4-21. Figure 17
Navigation to P115 parameter
screen
Non-linear Profiles (Flow from Level)
Standard non-linear profiles for flow:
•Flume 3/2
• V-Notch 5/2
• Manning formula
• Special (plotted)
NOTE:
The "Duty" Wizard is the easiest way to set-up a flow application.
Menu: SETUP / [CONTROL UNIT /] DUTY(Mode) / Duty Wizard
The 3490 Series Control Unit has a library of profiles for open-channel flow
measurement, two of which are illustrated in Section “Non-linear Profile (NLP)
calculation“ on page 4-29.
When selecting "V Notch", "Flume/Weir" or "Manning" through parameter
P113, the 3490 Series Control Unit automatically populates parameter P115
with a look-up table for the non-linear profile.
The standard flow profiles require an input signal in the range 0 - 1.0.
Parameter P114 is therefore used to scale the input signal over the range
0 - 1.0 as described below.
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
X 0.0 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Y 0.0 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
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