Field Instruments. Each RTU is connected to field sensors that provide indication of the process conditions into the PLC system. Typical analog sensors used in the City’s system include pressure, level, flow, temperature and analytical – each of which that provides a signal that is a percentage of the maximum allowed/measureable. Discrete signals are also measured including door ajar, smoke, flood, and other float type indications. These sensors exist in the City’s system and most are nearing their anticipated life. The Consultant includes a data column in the pricing sheet for replacement of these older field instruments to provide a worse case replacement price, however the City may elect to stock a couple sensors of each type and replace as necessary.
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Sources: Professional Services, Professional Services