Saturday, February 6, 2010

What is ';deadband'; in process control engineering?

I have little confusion with this term.This term comes under both measurement system and process control system.Please explain me in detail for the PROCESS CONTROL SYSTEMWhat is ';deadband'; in process control engineering?
A bunch of hippies in tye-dye shirts playing extra-long jams...





Actually, it's a control zone where no action is taken. It prevents a control system from hunting endlessly back and forth. Think of it as a kind of windowing function. It differs from hysteresis in that there is no control output in the deadband.





For example, gears with play in them have a mechanical deadband - slack (ahem) if you will - that must be overcome when changing direction. This isn't the same thing as hysteretic snap action.





An electronic version would be a PNP-NPN push-pull driver pair with a dead band inserted to prevent both of them being turned on at the same time (second link).What is ';deadband'; in process control engineering?
its also referred to a hysteresis loop

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