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The DDW-DS31 flow monitor is used for monitoring the flow of water, oils, and neutral liquids. The DS31 flow monitor contains a rugged and uncomplicated diaphragm system. The differential pressure generates a unilateral force at the membrane which moves the diaphragm system against the measuring range springs. The resulting displacement activates a micro switch. The user sets the switch locally by a hand wheel in the range of 30 – 100% of the flow span. download pdf datasheet