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Reference Manual
IP2030/RM, Rev AA
Section 4: Getting started
June 2014
Section 4: Getting started56
4.5.13 Set-up flow calculations for non-linear / non-uniform
open channel profiles (advanced users)
The MCU900 Series control unit can use level measurements to calculate flow in open channels,
which can then be totalized. The control unit has a library of popular non-linear profiles for flow:
Flume 3/2
V-Notch 5/2
Manning formula
Figure 4-20 on page 57 shows a typical open channel flow structure.
Essential parameters to program
Note
P200 (PV units) must be changed from % to the required units of measurement.
The parameter P200 is in the menu SETUP / [CONTROLLER /] DISPLAY
Select a standard non-linear open channel profile
Use P113 (or P123) to select V Notch (5/2), Flume (3/2) or Manning from the option list.
The control unit then automatically populates P115 (or P125) with data from the built-in library.
The flow calculations for these non-linear profiles require an input value over the range 0.0 to
1.0. Parameter P114 (or P124) is therefore used to convert (scale) the input signal to be a value
within the range 0.0 to 1.0 for the flow calculation.
Note (MCU901/MCU90F)
P113, P114, and P115 are in the menus SETUP / [CONTROLLER /] INPUT CHANNEL
/Ch1 Profile, /Ch1 Pre scale, and /Ch1 NLP Data respectively
Note (MCU902)
P113, P114, and P115 are in these menus:
SETUP / [CONTROLLER /] PV CALCULATION / CHANNEL 1 / Ch1 Profile, /Ch1 Pre scale,
and /Ch1 NLP Data (respectively)
P123, P124, and P125 are in these menus:
SETUP / [CONTROLLER /] PV CALCULATION / CHANNEL 2/ /Ch2 Profile, /Ch2 Pre scale,
and /Ch2 NLP Data (respectively)
Note
When using the App Wizard, select V-Notch Weir (5/2), Flume/Weir (3/2), or
Manning at the prompt for a profile. This populates parameter P113 (or P123).
Setting P114 (or P124) when a 4–20 mA level transmitter is connected
The 4–20 mA level transmitter should ideally provide a mA signal that is already scaled for the
full level range expected in the flow channel. P114 (or P124) can then be kept set at the default
value of 1.0.