Flow Measurement of Thermal Oil At a production site for Sodium Hydroxide (NaOH) a watery solution of it is boiled down until all water is evaporated. The more than 610 °F hot melted NaOH is then fed into a falling tower, where it is sprayed out of the pipe and solidifies into small droplets when falling down the tower. To prevent the Sodium Hydroxide from already solidifying within the pipes leading to the falling tower, they have to be heated all along the way. As a heat exchanging medium for the trace heating, a thermal oil known as Diphyl is used. It order to care for the right amount of heat supplied, it is crucial to exactly monitor the flow rate of the 680 °F hot Diphyl. Previously installed Orifice Plates in conjunction with differential pressure flow meters have been subject to e

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