The invention relates to a method and apparatus for exact measurement of pressures by means of level or pressure measuring equipment of the bubble tube type. The equipment comprises a bubble tube, a source of pressure, a pressure transducer, and valves which are controlled by a sequence switch means. The invention is characterized in that immediately prior to taking a measurement the source of pressure is connected to the bubble tube for expelling possible liquid therein and in that the source of pressure is then disconnected from the bubble tube. The pressure transducer is connected to the bubble tube during a measuring interval of short duration.
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