Waste Water System, City of Frankfort, KY:
Problem: The city of Frankfort, due to it's terrain, has 29 waste water lift stations. To prevent damage from flooding, it is important to alert maintenance personnel should a fault occur.

Solution: Key Telemetering installed the Datrax 520 Remote Terminal at each station. These units were standard off the shelf Remote Terminals with modem, uninterruptible power supply and Hoffman NEMA-4 housings. The following alarms were reported to the main treatment plant where personnel were on duty around the clock.

1. Power Failure
2. High Wet Well
3. Station Water
4. Lead Pump Failure
5. Lag Pump Failure
6. Station Security (Door Open)
7. Waste Water Flow Rate

The Datrax 520s were linked to the treatment plant via pull period multi-drop telephone line. A Personal Computer provided continuous polling plus display of the alarms at each station. In addition, the PC sent serial data to a Map Panel of Frankfort with red and green lamps to indicate the pump station status.

Tri-Cities Gas Storage Field, Lone Star Gas Company:
Problem The Tri-Cities storage field has 18 wells where natural gas is injected or produced depending on the company's:
customer load. The wells were spread over a three mile radius from the compressor station and office. The specifications required the monitoring and control of each well location.

Solution: Again a standard Datrax 520 Remote Terminal Remote Terminal was installed at each well site. The communication link was provided by Motorola UHF transceivers operating at 450 MHz range. Specification:

　1. Remotely Open or Close four valves (Inject or Produce)
　2. Report Well Pressure, Regulated Pressure and Flow Rate (Calculated by Datrax)

The Datrax Data was processed by a Programmable Logic Controller in the compressor office.

Natural Gas Distribution System, WP Natural Gas Company:
Problem: WP Natural Gas has 31 large industrial customers located in northern Oregon and southern Washington. The efficient allocation of gas supplies required the Portland Gas Control Center to monitor the pressure, accumulated flow and ambient temperature at the customers gate station. In addition the Control Center must be alerted should be pressure drop below the alarm set point.

Solution: The Datrax 520 RTUs were installed with low cost MultiTech modems. Daily and hourly data was stored in the Datrax for thirty days. A Personal Computer in Portland polled the customers every morning, then transferred this data to Microsoft Excel. The MultiTech modem provided efficient error checking and correction.