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R82-526A-03M Datasheet(PDF) 3 Page - Magnetrol International, Inc. |
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R82-526A-03M Datasheet(HTML) 3 Page - Magnetrol International, Inc. |
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3 / 12 page  The R82 transmitter is a top-mounted, downward-looking pulse burst radar operating at 26 GHz America. Unlike true pulse devices (Eclipse Guided Wave Radar) which transmit a single, sharp (fast rise-time) waveform of wide-band energy (Figure 1), the R82 emits short bursts of 26 GHz energy (Figure 2) and measures the transit time of the signal reflected off the liquid surface. Distance is calculated utilizing the equation Distance equals the Speed of light multiplied by the transit time divided by two (Distance = C × Transit Time/2), then developing the level value by factoring in tank height and sensor offset information (Figure 3). The exact reference point for distance and level calculations is the sensor refer- ence point (bottom of an NPT thread, top of a BSP thread, or face of a flange). The exact level measurement is extracted from false target reflections and other background noise via the use of sophisticated signal processing. The R82 circuitry is extremely energy efficient so no duty cycling is necessary to accomplish effective measurement. For this reason it can track high rates of change (180 inches [450 cm] per minute) that have been impossible with existing loop-powered radar transmitters. T E C H N O L O G Y P U L S E B U R S T R A D A R ETS, or Equivalent Time Sampling, is used to measure the high-speed, low power EM (electromagnetic) energy. ETS is a critical key in the application of radar to vessel level measurement technology. The high speed EM energy (~1 ft/nS) is difficult to measure over short distances and at the resolution required in the process industry. ETS captures the EM signals in real time (nanoseconds) and reconstructs them in equivalent time (milliseconds), which is much easier to measure with today’s technology. ETS is accomplished by scanning the vessel to collect thou- sands of samples. The round-trip event on a 40-foot (12.2 meter) tank takes only 82 nanoseconds in real time. After it is reconstructed in equivalent time it measures 135 milliseconds. E Q U I V A L E N T T I M E S A M P L I N G Distance = c × (time ÷ 2) 1 ns 500 ns Figure 1 Figure 2 Pulse Pulse Burst O P E R A T I O N A L C O N S I D E R A T I O N S Figure 3 Radar applications are characterized by three basic conditions: • Dielectric • Distance (measuring range) • Disturbances (turbulence, foam, false targets, multiple reflections and rate of change) The R82 Radar transmitter is offered with two basic antenna configurations: • Polypropylene-encapsulated horn • Tefzel®-encapsulated horn. Tank Height Sensor Offset + Tank Height = Distance from process connection to tank bottom 20 mA 4 mA Sensor Reference Point Sensor Offset (+) Blocking Distance Highest Measureable Value Distance Safe Zone Media Level Level Offset Lowest Measurable Value 3 |
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