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Explain working of pressure switch with suitable diagram. State the function of differential setting in pressure switch.

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Pressure switch is used to turn on/off when specified pressure is reached. It consists of a pressure port and bellows. When pressure is applied, bellows expand and actuate the snap action switch against return spring force. Differential setting allows setting of cut-in and cut- out pressure setting i.e. hysteresis setting. This prevents chattering of pressure switch contacts.

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