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Reference Manual
IP2030/RM, Rev AA
Section 4: Getting started
June 2014
Section 4: Getting started52
4.5.10 Volumetric contents and flow measurement applications
(advanced users)
Sections 4.5.11 to 4.5.17 are for advanced users. They explain in-depth how the can be set-up to
use level measurements to calculate:
the volumetric contents of a linear (uniform) shaped, covered vessel
the volumetric contents or a non-linear (non-uniform) shaped, covered vessel
flow in non-linear (non-uniform) shaped open channels, which can then be totalized
flow in pre-programmed open channel flumes, which can then be totalized
The control unit has a built-in library of popular vessel profiles for volume of contents
calculations and standard open channel profiles for flow calculations.
For other vessel and channel profiles, see “Set-up flow calculations for non-linear / non-uniform
open channel profiles (advanced users)” on page 56.
4.5.11 Set-up the volumetric contents calculations for a
popular linear / uniform vessel (advanced users)
The MCU900 Series control unit can use level measurements to calculate the volumetric
contents of a linear (uniform) shaped, closed vessel e.g. a vertical cylinder or rectangular vessel.
Essential parameters to program
Set-up volumetric contents calculations for a linear (uniform) vessel
Parameter P113 (or P123) must be set to Scaled, which establishes that the volume of the
vessel contents is linearly derived from the liquid level measured by a transmitter (D801).
Parameter P114 (or P124) must be set to:
the maximum contents volume of the vessel (if 4–20 mA level transmitter is used) or
the cross-sectional area of the vessel per unit of level measurement
(if a HART level transmitter is used)
Note
For a 4–20 mA transmitter measuring level, the volume is calculated as:
D851 = D801 where D801 = (D802 / 100) * P114
For a HART level transmitter measuring level for Input Channel 1, the volume is
calculated as: D851 = (P114 * Level measurement after offset P112 is applied)
For a HART level transmitter measuring level for Input Channel 2, the volume is
calculated as: D852 = (P124 * Level measurement after offset P122 is applied)
P113 and P114 are in sub-menus /Ch1 Profile and /Ch1 Pre scale at:
SETUP / [CONTROLLER /] INPUT CHANNEL (on MCU901/MCU90F) or
SETUP / [CONTROLLER /] PV CALCULATION / CHANNEL 1 (on MCU902)
P123 and P124 are in sub-menus /Ch2 Profile and /Ch2 Pre scale at:
SETUP / [CONTROLLER /] PV CALCULATION / CHANNEL 2 (on MCU902)
Read-only parameters D80* are in the menu MONITOR / READINGS