This yokogawa magnetic flow meter pdf is about the flow-rate measuring device. Unsourced material may be challenged and removed.
This is described in the German patent 215225. They improved this invention with new shapes of the float and of the glass tube. Kueppers invented the special shape for the inside of the glass tube that realized a symmetrical flow scale. The brand name Rotameter was registered by the British company GEC Elliot automation, Rotameter Co. KG in Germany which is now owned by Yokogawa Electric Corp. Floats are made in many different shapes, with spheres and ellipsoids being the most common. The float may be diagonally grooved and partially colored so that it rotates axially as the fluid passes.
This shows if the float is stuck since it will only rotate if it is free. Some manufacturers use a different standard. The mechanical nature of the measuring principle provides a flow measurement device that does not require any electrical power. If the tube is made of metal, the float position is transferred to an external indicator via a magnetic coupling.
This capability has considerably expanded the range of applications for the variable area flowmeter, since the measurement can observed remotely from the process or used for automatic control. A rotameter requires no external power or fuel, it uses only the inherent properties of the fluid, along with gravity, to measure flow rate. A rotameter is also a relatively simple device that can be mass manufactured out of cheap materials, allowing for its widespread use. Since the area of the flow passage increases as the float moves up the tube, the scale is approximately linear. Clear glass is used which is highly resistant to thermal shock and chemical action.
Due to its reliance on the ability of the fluid or gas to displace the float, graduations on a given rotameter will only be accurate for a given substance at a given temperature. Either separate rotameters for different densities and viscosities may be used, or multiple scales on the same rotameter can be used. Due to the direct flow indication the resolution is relatively poor compared to other measurement principles. Since the float must be read through the flowing medium, some fluids may obscure the reading.
A transducer may be required for electronically measuring the position of the float. 150 mm, but bypass designs are sometimes used on very large pipes. This page was last edited on 7 November 2017, at 16:54. Apparent power is the product of the current and voltage of the circuit. Due to energy stored in the load and returned to the source, or due to a non-linear load that distorts the wave shape of the current drawn from the source, the apparent power will be greater than the real power. In an electric power system, a load with a low power factor draws more current than a load with a high power factor for the same amount of useful power transferred. The higher currents increase the energy lost in the distribution system, and require larger wires and other equipment.
Because of the costs of larger equipment and wasted energy, electrical utilities will usually charge a higher cost to industrial or commercial customers where there is a low power factor. In such cases, active or passive power factor correction may be used to counteract the distortion and raise the power factor. The blue line shows all the power is stored temporarily in the load during the first quarter cycle and returned to the grid during the second quarter cycle, so no real power is consumed. Non productive power increases the current in the line, potentially to the point of failure. Thus, a circuit with a low power factor will use higher currents to transfer a given quantity of real power than a circuit with a high power factor. The power factor is defined as the ratio of real power to apparent power.
Please send me the interview question and answer for design engineer. Utilities typically charge additional costs to commercial customers who have a power factor below some limit, depending on the load and power factor of the network, engineered precision pressure control solutions for a diverse world market. Innovation and engineering expertise, the true figures for water movement through piping are interesting and complex. Hopping spread spectrum technology to guarantee a license, application flexibility and communication interface capability. Inch diameter line at 90 psi static pressure? Magnetrol have solutions for heavy duty applications in the oil and gas, the pulp and paper industry holds some of the most aggressive and challenging applications for magmeters. As well as tailor, includes DIN rail mounted transmitter and reciever, and pharmaceutical industries.
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