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Power Plant Instrumentation and Control Handbook by Ajay Kumar Debnath, Swapan Basu

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5. Level Measurement

Level measurements are very important for any industry or plant as water is required everywhere, but they are specifically important for thermal power plants. All the regenerative heaters, gland coolers, ejectors, deaerators, and most important, boiler drums, require level measurements.
Some typical level measuring points for a 250 MW thermal power plant are given in Table IV/5-1.

5.1. Level Transmitters: Working Principle

The level measurement can be broadly be categorized in two parts: continuous or point values. Continuous level instruments measure levels within a specified range and determine the accurate amount (taking the accuracy figure into consideration) of substance in a certain place. There are two major types of level ...

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