ProSoft Technology PTQ-AFC - Manual (Page 70)

Quick Start PTQ-AFC ♦ Modicon Quantum Platform
User Manual Liquid and Gas Flow Computer for Hydrocarbon Products
Page 70 of 259 ProSoft Technology, Inc.
June 23, 2011
6.7 Meter Channel Functionality
6.7.1 Meter Channels
The number of available meter channels depends on the platform as follows:

MVI46-AFC = 8 meters
 MVI56-AFC = 16 meters
 MVI69-AFC = 8 meters
 MVI71-AFC = 8 meters
 PTQ-AFC = 16 meters
Each meter channel can be assigned as a linear meter (pulse meter) input or as
a differential meter (orifice meter) input for flow measurement using either SI or
US units. Selecting the differential meter causes the module to use the AGA 3
standards for flow calculation. 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 the API2540 Standards. "Crude/LPG"
and "Oil-Water Emulsion" use the base, "A", and "E" tables 23/24/53/54, and
"Refined Products" uses the "B" tables 23/24/53/54. "Crude/LPG" is used for
propane, butane, NGLs (natural gas liquids), and crude oils which are relatively
water-free (less than 5 per cent. "Oil-Water Emulsion" is 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" is used for gasoline, jet fuels, and
fuel oils.
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
Differential Liquid API2540, AGA3
Linear Gas AGA8, AGA7
Linear Liquid API2540, MPMS ch12.2
Note: The meter channel must be disabled in order to change its meter type and product group.