switches, namely, pressure switches for determining when a threshold pressure has been reached and opening or closing an electrical circuit; vacuum pressure switches for determining when a threshold pressure below ambient has been reached and opening or closing an electrical circuit; differential switches; temperature switches; and level switches for monitoring and controlling liquids and/or particulate media in tanks and vessels

'ambient':31 'and/or':54 'circuit':20,41 'close':17,38 'control':52 'determin':6,25 'differenti':42 'electr':19,40 'level':47 'liquid':53 'media':56 'monitor':50 'name':2 'open':15,36 'particul':55 'pressur':3,10,22,29 'reach':13,34 'switch':1,4,23,43,45,48 'tank':58 'temperatur':44 'threshold':9,28 'vacuum':21 'vessel':60

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