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Title: Radio-Transmitted, Microcomputer-Based Telemeter System
Author: Virgil B. Hammond
Source: American Gas Association 1987
Year Published: 1987
Abstract: In 1983, Northern Illinois Gas began a project to replace a telemetering, or SCADA (Supervisory Control and Data Acquisition), system it had used more than 20 years to transmit storage and supply data. The selection of new equipment was to be based on three objectives: it had to be reliable, readily expandable, and reduce operating costs. A microprocessor-based system that uses solid-state modules for various control operations was chosen. With this equipment, data are transmitted by radio rather than by the conventional method over telephone tines. Each of the systems 13 cells has a central microcomputer, which monitors the stations within that cell. Sequentially, a master central processing unit (CPU) records and relays data from the cell microcomputer to Nl-Gas Gas Control computer. The system monitors nearly 500 separate data items at 70 stations. In addition, it provides flow-control capability at 14 stations and on/off control for two line valves and five odorizers. Ultimate plans include closed loop flow and odorant control. Future expansion will occur by adding stations to existing cells and creating new cells. Satellite radio transmission is also a viable option.

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