Explain working of water level indicator with neat sketch.

Explain working of water level indicator with neat sketch.
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Answer :

Water level indicator:

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Working: Its function to indicate water level in boiler. usually two water level indicator are fitted to in front of boiler. WLI shows the water level in in the boiler drum and warns to operator it by chance the water level goes below a fixed mark , so that corrosive action may be taken in time to avoid accident. 

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