Emerson Rosemount 3490 Series Reference Manual page 71

Reference Manual
00809-0100-4841
Note
P210 is in the menu SETUP → CONTROLLER → OUTPUT → PV DAMPING/MCU PV
DAMPING.
D852 is in the menu MONITOR → DIAGNOSTICS/CHANNELS/Ch2 Output.
4.4.9 Volumetric contents and flow measurement
applications (advanced users)
Sections
(advanced users)
users. They explain in-depth how the can be set-up to use level measurements to
calculate:
• Volumetric contents of a linear (uniform) shaped, covered vessel.
• Volumetric contents or a non-linear (non-uniform) shaped, covered vessel.
• Flow in non-linear (non-uniform) shaped 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
popular non-linear/non-uniform shaped vessel (advanced
Set-up the volumetric contents calculations for a popular
linear/uniform vessel (advanced users)
The 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:
• Maximum contents volume of the vessel (if 4–20 mA level transmitter is used), or
• 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)
Emerson.com/Rosemount
Set-up the volumetric contents calculations for a popular linear/uniform vessel
to Using a plotted profile for calculating volume or flow
Set-up the volumetric contents calculations for a
users).
Getting started
January 2021
are for advanced
71