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Note that a sightglass level gauge appears on the left-hand side of the knockout chamber (or condensate boot) for visual indication of condensate level inside the process vessel: The purpose of this particular displacer instrument is to measure the amount of condensate liquid collected inside the “boot.” This model of Fisher Level-Trol comes complete with a pneumatic controller mechanism sending an air pressure signal to a drain valve to automatically drain the condensate out of the boot. The weight and lever may be completely hidden from our view by this wall, but the small rod’s twisting motion nevertheless reveals how much the torque tube yields to the force of the weight. The level reading from the displacer can be incorrect if the temperature and/or density of the liquid in the vessel is different from that of the liquid in the external cage. sand). This will submerge more of the displacer’s volume, causing a buoyant force to be exerted upward on the displacer.  Calculate zero level using this equation:  (Lighter Process Fluid Operating SG / Water SG)*Transmitter Level Range,  (Heavier Process Fluid Operating SG / Water SG)*Transmitter Level Range. Calculating buoyant force on a displacer element due to a combination of two liquids is not as difficult as it may sound.  2. Displacement transmitters can be use also for density measurement if the displacer is permanently and fully immersed in a single fluid. Suppose we have a displacer instrument measuring the interface level between two liquids having specific gravities of 0.850 and 1.10, with a displacer length of 30 inches and a displacer diameter of 2.75 inches (radius = 1.375 inches). Stay up to date with the latest of Magnetrol. By using handheld HART communicator set this level as zero level (see also in the LCD display of the transmitter, it should show zero level). Two photos of a disassembled Level-Trol displacer instrument appear here, showing how the displacer fits inside the cage pipe: The cage pipe is coupled to the process vessel through two block valves, allowing isolation from the process. Block, drain and vent valves should be installed to fill and empty the chamber to carry out maintenance activities. With less solid metal, the rod will be a weaker spring, and will twist to a greater degree with applied weight at the end of the lever. Note how important it is to maintain consistency of units! Source : International Association of Oil & Gas Producers. An ultrasonic level instrumen…, Ultrasonic Level Transmitter Principle, Limitations, Calibration and configuration, FMCW Radar Level Transmitter Working Principle, Level Measurement with Dry leg and Installed Below Tapping Point, Problem on PLC, HMI, VFD, and Motor Circuit, Readings Mismatch between Field & Control Room ? The displacer level transmitter (or any other buoyancy level transmitter) uses the effect of buoyancy. The most common solution to this problem is an ingenious mechanism called a torque tube. The liquid density was given in units of pounds per cubic foot and the displacer dimensions in inches, which would have caused serious problems without a conversion between feet and inches. Equation [1] is applicable if there is only one variable. Instead of a being a “torsion bar,” the rod is now more properly called a torque tube, twisting ever so slightly with applied weight at the end of the lever. The flange is mounted to a stationary surface, and a weight suspended from the end of the lever. Published under the terms and conditions of the, Introduction to Continuous Level Measurement, Displacement and Displacer Level Instrumentation, Ultrasonic (Sound) Echo Level Measurement, Creative Commons Attribution 4.0 International Public License. Applicable to measure the liquid level, interface level at condition of high temperature, high pressure. For a single liquid, buoyant force is equal to the weight density of that liquid (\(\gamma\)) multiplied by the volume displaced (\(V\)): For a two-liquid interface, the buoyant force is equal to the sum of the two liquid weights displaced, each liquid weight term being equal to the weight density of that liquid multiplied by the displaced volume of that liquid: \[F_{buoyant} = \gamma_1 V_1 + \gamma_2 V_2\]. The vendor specific maintenance manual shall be used in detail. Some displacer-type level sensors do not use a cage, but rather hang the displacer element directly in the process vessel.

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