Q PROCESS INSTRUMENTATION CH.4 TEST A. Flat B. Bubbler C. Continuous level measurement D. Decanting E. Ultrasonic and radar device F. Depth G. Welded pad gauge H. Direct level measurement I. Reflex level gauge J. Tape K. Height L. Percent level measurement M. Point level measurement N. Inches of water column- O. Indirect level measurement P. Tubular type sight glass Q. Innage R. Interface level S. Level measurement T. Transparent level gauge T. Liquid (hydrostatic) head pressure U. Load cell V. Meniscus W. Nuclear device X. Percent level measurement Y. Point level measurement Z. Pounds per square a. inch (PST) b. Displacer c. Tape gauge a local level d. Ullage (outage) 1.__-glass level gauge-there are three types of flat-glass level gauges: reflex, transparent, and welded pad; the heavy, thick-bodied glass promotes safety in high temperature and high-pressure hydrocarbon or steam service 2.__-a level measurement system used in open or vented containers that measures head pressure and that then converts the measurement to a level reading; this allows the measurement of head pressure in a liquid without the pressure sensor coming in contact with the process fluid. 3.__-monitoring of all level points in the tank from the 0 percent level (bottom of the measuring device) to 100 percent full; used in processes with control loop instrumentation to provide ongoing measurement Decanting 4.__-a process for the separation of mixtures of immiscible liquids or of a liquid and a solid mixture such as a suspension 5.__an accurate distance measuring instrument usually inserted into the top of a vessel; emits a pulse of energy that is reflected off the surface of the material back to the receiver, may be either a single unit (transponder) or two separate units (transmitter and receiver) 6.__-the distance from the surface of a liquid down to a zero reference point 7.__-a local measuring device generally made of flat glass and integrally mounted to the vessel by either a welded or flanged connection with threaded pipe extremely rugged to prevent vessel drainout 8.__-measures the process variable directly in terms of its (e.g., using a sight glass or dipstick) 9.__-a local measuring device that has a single flat-glass panel capable of refracting light off a prism like backside, creating a silvery contrast above the liquid level that allows it to be seen from a distance. 10.__-a narrow strip of calibrated ribbon (steel) used to measure length 11.__-a distance from a zero reference point to the surface, 12.__a measurement of level based upon percentage, with 0 percent level being the lowest measuring point and 100 percent level being the maximum measuring point. 13.__-level is measured at one distinct point in a tank 14.__-a pressure measurement scale that can be used for liquid level in low pressure containers, generally open or vented to the atmosphere; accuracy is dependent on the liquid's specific gravity; the measurement can be converted to pounds per square inch (PSI) 15.__-measures another process variable (e.g., head pressure or weight) in order to determine level 16.__-a local measuring device that has a reflex or clear glass tube open into a vessel on top and bottom. 17.__-the measurement from the bottom of a tank to the surface of the product. 18.__l-the surface at which two immiscible fluids meet; the interface can be between two liquids, a liquid and a slurry, or a liquid and a foam 19.__the act of establishing the height of a liquid surface in reference to a zero point. 20.__a local measuring device that has two transparent flat-glass panels, front and back. These flat-glass panels, in conjunction with the metal sides, form a vertical chamber where the process level can be seen and measured. 21.__the pressure exerted by the height of a column of liquid; the most common indirect level measurement. 22.__-a level measuring device consisting of a transducer that measures force or weight (called a strain gauge), which is bonded to a robust support column called a force beam: generally built into the supporting structure of a vessel. 23.__-the curved upper surface of a column of liquid having either a convex or concave shape. 24.__ a tightly controlled gamma radiation source with a detector located on the outside of a tank and impervious to the effects of adverse process conditions, common gamma radiation sources are the radioisotopes cobalt 60 and cesium 137. 25.__a measurement of level based upon percentage, with 0 percent level being the lowest measuring point and 100 percent level being the maximum measuring point. 26.__-level is measured at one distinct point in a tank. 27.__-a pressure measurement scale often used in liquid level measurement using the liquid's hydrostatic head pressure; also expressed as inches of water column. 28.__-a sealed cylindrically shaped tube that uses the principle of buoyancy to displace an amount of fluid equal to the container level 29.__-measuring device consisting of a metal tape that has one end attached to an indicator and the other end attached to a float residing on top of the liquid level. 30.__--the measurement from the surface of the product to a reference point at the top of the tank. 31. Level can be defined as the a. location b. width c. point d. height 32. The hydrostatic head pressure exerted by 36 in. of water is equal to: a. 36 in. w.c. + 1.25 b. 36 in. w.c. c. 36 in. w.c. 1.350 d. 12 in. W.c. 33. If the mass remains constant and the density of a liquid in a tank decreases, the level of the liquid in the tank; a. increases b. decreases c. remains constant d. does nothing because density and level are not related 34. When the volume of a liquid in a tank decreases, the level of the liquid in the tank a. increases b. decreases c. remains constant d. does nothing because density and level are not related 35. Which of the following is the oldest type of gauge glass still in use today? a. Flat glass level gauges b. Reflect level gauges c. Transparent level gauges d. Tubular type sight glass 36. What method is used to measure nonflammable processes? a. Bubbler b. Displacer c. Transmitter d. D/P cell PreviousNext