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Flow computers

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PROSOFT Technology has released flow computers for Allen-Bradley's ControlLogix, SLC, and PLC platforms and Schneider Electric's quantum processor. They are available from ATS .

The modules offer communication flexibility between the flow computer and Modbus devices, which is critical for pump stations and process plants. They offer data exchange between processor and AFC module with backplane compatibility and a detailed characterisation method for AGA 8 pressure/temperature compensation. They use a Windows-based system configuration, have data archiving and event logging, and are field programmable

The flow computers support 16m runs for the measurement of hydrocarbon gases using the AGA 3, 7, and 8 measurement standards, and API 2540 for hydrocarbon liquid flow measurement. This facilitates custody transfer of products between two parties and line balance for pipeline leak detection. The three inbuilt Modbus ports provide online configuration access, allowing the user complete configuration access to the data table. One Modbus port can be configured as a master providing a Modbus interface to gas chromatographs for gas analysis or any other Modbus slave devices.

The modules use the process data collected by processor analogue I/O modules. The processor is responsible for transferring this data to the AFC module, which then calculates flow rates, accumulated volumes and accumulated mass. The results of the calculations are transferred back to the processor for use in the application ladder logic, or for transfer to a SCADA host. Event log reporting for security sensitive configuration data are date and time stamped and mapped to the local Modbus memory map. This data can be imported into any spreadsheet program and saved to disk or printed as hard copy.

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