A municipal, waterworks and sewerage company (MPWiK), in Poland, built new cisterns in the area of the river embankment in Rajsko, to the south of Krakow. The tanks provide water for several townships in that area.
The gate valve chamber in Rajsko comprises delivery, outlet, overflow and fall pipes and a hydrophore room - and ensures supply of water for the so-called upper zone of Rajsko. The cisterns themselves are fed from a branch of the RABA main pipeline.
MPWiK retained a specialised company, Comptur (Microcomputer Systems) from Krakow, to develop a system of monitoring and data transmission via radio, between the cisterns in Rajsko and the Piaski Wielkie dispatch room. The Rajsko cisterns site controller subsystem was incorporated into a large hierarchical microprocessor system: Raba II is a centralised recording of data and controlling facility that has operated since the early '90s.
Comptur provides technical assistance and current maintenance for that system. Radio modems were chosen for transfer of data. Considering the proximity of the sites (direct distance approximately 2 km), clear line-of-sight, and lack of conventional communication, the designers opted for low power radio modems ensuring synchronic (periodic) data transmission and instantaneous burglary alarms. After some investigating, the company selected wireless transmission based on a Satel modem. The radio modem was connected by an RS232 interface to the PC586 workstation installed in Piaski Wielkie Dispatch Room.
The radio installation makes it possible to exchange data on-line, which is of extreme importance when emergency situations arise with respect to process disturbances, such as tank overflow or damaged hydrophore. Such instantaneous treatment of data is also indispensable in respect of trespassing alarm signals (opened tank hatches, opened entrance doors).
Prior to the implementation of the project, the radio modems were tested. The trials involved transmission between Piaski Wielkie Dispatch Room and Rajsko Cisterns, on the basis of 20 mW Satel transmitters operating in the range 420-450 MHz. Thanks to successful results of the tests, the data transmission cost was minimised - because no permits were required for equipment with power not exceeding 20 mW and working on frequencies over 430 MHz in Poland.
The Rajsko cisterns site controller is based on the GE Fanuc series 90-Micro - a single-module, programmable controller. Signalling is RTU Modbus protocol. An RS485/RS232 converter and a second port of the GE Fanuc 90-Micro controller were used between the controller and the radio modem. Analog values of physical parameters measured by the controller (water level in the tanks, pressure, etc - multiplexed) are sent to the district station in Piaski Wielkie Dispatch Room and mapped on the related technological screen of the RABA II system. Site visualisation on another screen is available with the InTouch software.
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