| 摘要 |
<p>Apparatus for use in the measurement of the API gravity of crude oil comprises a conduit 1, such as a flowline, through which the oil can flow. A contact thermometer, such as a thermocouple 4, is mounted in the conduit in contact with the crude oil for measuring the temperature of the oil. An infrared thermometer 5, 6 is positioned such that the crude-oil temperature can be detected through a window 3 in the conduit 1. Circuits (20, Fig 2) compare the measurements of temperature made by the thermometers to obtain a measure of the emissivity of the crude oil and thereby its API gravity (density). The window 3 is preferably made of sapphire glass. A known sample of crude oil may be used to calibrate both the contact 4 and infra-red 5, 6 thermometers.</p> |
