Nuclear density meters are limited in scope to what is seen by the gamma radiation beam. Therefore, the density of the media is inversely proportional to the radiation captured and seen by the scintillator. Radiation that is absorbed by the mass is not seen by the scintillator device. The number of flashes of light is counted. The radiation is converted into flashes of light. The radiation is seen by a scintillator device. This source is typically caesium-137 (half-life: ~30 years). Gamma radiation is emitted from a source. Nuclear density meters work on the principle of measuring gamma radiation. The span difference is used to see how temperature and pressure have changed. Coriolis meters cannot be calibrated while in use. The zero points for these values are used to calibrate the system. Coriolis meters also have a fast response time.Ĭoriolis meters need to be calibrated for temperature and pressure. However, this measurement technique results in high accuracy and high repeatability. These measurements are restricted to small diameters for flow tubes. However, a volumetric flow can be inferred from the mass flow measurement. Higher density media causes a larger Coriolis effect if the volumetric flow rate is constant.įlowing media causes a frequency and a phase shift of the bent pipe, which are proportional to the mass flow rate of the sample.Ĭoriolis meters measure the mass flow of the system. Therefore, the resonant frequency is directly affected by the density. This twisting causes phase shifts which result in changes in the resonant frequency of the thin walled tube. However, when the density inside the bent section increases, the inbound flow portion of the bent pipe drags behind the out flow portion. When there is no mass in the bent section, the tube remains untwisted. The bent thin walled tube is rotated around a central axis. Industries such as mining, dredging, wastewater treatment, paper, oil, and gas all have uses for density meters at various points during their respective processes.ĭifferent types of density meter Coriolis Ĭoriolis density meters, also known as mass flow meters or inertial flow meters, work on the principle of vibration to measure phase shifts in the vibration of a bent thin walled tube. Density meters are used to measure slurries, sludges, and other liquids that flow through the pipeline. Each type has its advantages and drawbacks.ĭensity meters have many applications in various parts of various industries. Each type measures the density differently. Different types include: nuclear, coriolis, ultrasound, microwave, and gravitic. Density is usually abbreviated as either ρ = the density of the reference material (usually water).ĭensity meters come in many varieties. A density meter ( densimeter) is a device which measures the density of an object or material.
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