ProSoft Technology MVI56-AFC - Manual (Page 32)

Meter Channel Functionality MVI56-AFC ♦ ControlLogix Platform
User Manual Liquid and Gas Flow Computer
Page 32 of 316 ProSoft Technology, Inc.
February 25, 2011
3.1 Meter Channels
Each meter channel can be assigned as a linear meter (e.g. a pulse meter) input
or as a differential meter (e.g an orifice meter) input for flow measurement using
either SI (metric) or US units. Selecting the differential meter causes the module
to use the AGA 3 standard for flow calculation (for a gas orifice meter you may
optionally choose ISO 5167-2 instead). Selecting the linear meter causes the
module to use the AGA 7 standard for gas flow calculation.
Each meter channel can be configured for gas or liquid (crude or refined)
product. The Product Group essentially selects the API/AGA Standards to be
used in calculating flow rates/increments.
Selecting "Gas" causes use of AGA8 and either AGA3 or AGA7 Standards.
Selecting any liquid group causes use of API MPMS Chapter 11(tables
23/24/53/54) and related Standards. "Crude oils, JP4" and "Oil-water emulsion
Crd)" use the, "A", tables. “NGLs, LPG’s” and “Oil-water emulsion (NGL) use the
“E” tables. "Refined Products" use the "B" tables. "Lubricating oils" use the "D"
tables, and "Special applications" use the "C" tables. "Crude oils, JP4" and
"NGLs/LPG" are used for propane, butane, NGLs (natural gas liquids), and crude
oils which are relatively water-free (less than 5 percent). The two "Oil-water
emulsion" groups are used for crude and NGL/LPG that might have a high
concentration of water for which API MPMS Chapter 20.1 is applicable. "Refined
products (xJP4)” is used for lighter refined liquids such as gasolines, jet fuels
(except JP4), and fuel oils. "Lubricating oils” is used for heavier refined liquids.
"Special applications" is used for those liquids that cannot reasonably be
assigned to one of the other groups; for this product group an explicit coefficient
of thermal expansion must be supplied.
The following table provides a brief overview of the standards used according to
the Meter Type and Product Group:
Meter Type Product Group Standards
Differential Gas AGA8, AGA3/ISO5167
Differential Liquid MPMS ch 11 AGA3/ISO5167
Linear Gas AGA8, AGA7
Linear Liquid MPMS ch 11, MPMS ch12.2
Note: The meter channel must be disabled in order to change its meter type and product group.