| 摘要 |
An object of the invention is to provide a pressure differentiator capable of improving measurement accuracy. The pressure differentiator of the invention includes an isothermal pressure vessel 1, a narrow tube 3 for connecting an object to be measured to the inside of the vessel 1, and a differential manometer 2 for calculating a differential pressure between the object and the inside of the vessel 1. It is preferable that a flow through the narrow tube 3 during measurement is a laminar flow. The isothermal pressure vessel 1 is fitted with a temperature equalizing material. As the temperature equalizing material, thin metal wires may be used. When the pressure P<SUB>s </SUB>to be measured within a vessel positioned below is changed, the pressure P<SUB>c </SUB>within the isothermal pressure vessel 1 is changed, with a slight lag, through the narrow tube 3. By measuring the differential pressure P<SUB>j </SUB>(=P<SUB>s</SUB>-P<SUB>c</SUB>) at that time, using a diaphragm-type pressure differentiator, the derivative value of the pressure P<SUB>s </SUB>may be calculated.
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