You only need to create and configure a SCADAPack Modbus Flow Run if Geo SCADA Expert is to monitor flow calculation data on a SCADAPack controller (see Configure Geo SCADA Expert to Monitor Realflo Calculation Data).
The SCADAPack Modbus Realflo driver allows you to configure three types of Flow Run:
- Gas—A Gas Flow Run is a two-calculation run that calculates both the volume and compressibility of the gas that flows through an individual gas meter.
- Liquid—A Liquid Flow Run calculates the volume flow rate and the mass flow rate of the liquid that flows through an individual meter.
- Water—A Water Flow Run calculates the volume flow rate of water that flows through and individual meter.
For each type of Flow Run the driver can read a Flow Run’s calculation parameters into Geo SCADA Expert, from a SCADAPack controller that is running Realflo, Alternatively. you can fully configure a Flow Run directly in the Geo SCADA Expert database and then write that configuration to the SCADAPack controller (see Configure or Read the Flow Run Configuration). You can then use Geo SCADA Expert to monitor and process the flow run’s data remotely.
You need to add one Flow Run item to the Geo SCADA Expert database for each separate flow run that Geo SCADA Expert is to monitor. Each Flow Computer can support between 1 and 10 flow runs—the number of actual flow runs that a controller can use is limited by Realflo license and the type of hardware that is being used to run the Flow Computer. For example, the hardware for a controller might support a maximum of 10 Flow Runs, but the license might support only four Flow Runs. (When Realflo is enabled on a SCADAPack controller, the controller converts into a fully functioning flow computer.)
You can configure the properties of each Flow Run in Geo SCADA Expert, using the relevant SCADAPack Modbus Flow Run Form. The amount of configuration varies, depending whether you are configuring a Flow Run fully in Geo SCADA Expert, or reading most of the configuration from a Realflo controller (see Preparation and Minimum Configuration).
To enable operators to view a Flow Run’s values, you can attach and display those values in a Mimic. To process an item of Flow Run data independently in Geo SCADA Expert, you can add and configure a SCADAPack Modbus Realflo Analog Input point. For more information, see View and Process Flow Run Data.
Each type of SCADAPack Modbus Flow Run Form has several tabs that allow you to configure the flow run.
All three types have a common Flow Run tab to:
- Configure the Flow Run Properties and either configure, or display the read, Input, Static Pressure, Temperature, and Contract properties.
All three types of flow run also have a common Meter Input tab to:
- Configure the Meter Mass Flow Properties to specify or ascertain the type of mass flow calculation that the Flow Run performs and configure, or display the read, calculation data (see Meter Input Properties).
With Gas Flow Runs, properties are only displayed on the Meter Input tab if the Flow Calculation Type is set to AGA-11 (an option that is only available from Realflo version 6.95 onwards).
The Gas Flow Run type has two additional tabs:
- Compressibility Calculation tab to specify or ascertain the type of compressibility calculation that the Flow Run performs and configure, or display the read, calculation data (see Compressibility Calculation Properties (Gas Flow Run)).
- Flow Calculation tab to specify or ascertain the type of flow calculation that the Flow Run performs and configure, or display the read, calculation data (see Flow Calculation Properties (Gas Flow Run)).
The Liquid Flow Run type has a Liquid tab to:
- Specify or ascertain the type of Density, Water Cut and Liquids calculations that the Flow Run performs and configure, or display the read, calculation data (see Liquid Flow Run Properties).
The Water Flow Run type has a Water tab to:
- Specify the Meter related parameters, including the K factor (see Water Flow Run Properties).
For information on the fields on other tabs, see Tabs that are Common to Many Configuration Forms in the Geo SCADA Expert Guide to Advanced Drivers. For flow run information that is not covered by this guide, refer to the documentation supplied with the Realflo application.
Further Information