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Calibrating Transmitters Paul Wakeham

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Calibrating Transmitters Paul Wakeham. Learning Objectives. Demonstrate converting transmitter input signals to output signals Follow lab procedure without guidance to perform transmitter calibration Document transmitter nameplate data. Operation. % INPUT = % OUTPUT

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Calibrating Transmitters Paul Wakeham

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  1. CalibratingTransmittersPaul Wakeham

  2. LearningObjectives • Demonstrate converting transmitter input signals to output signals • Follow lab procedure without guidance to perform transmitter calibration • Document transmitter nameplate data

  3. Operation % INPUT = % OUTPUT i.e: When input is 75%, Output is 75% TRANSMITTER INPUT OUTPUT

  4. Conversion Formula Range: Always Two values; URV: Upper Range Value LRV: Lower Range Value: 4–20 ma , URV = 20, LRV= 4 Span = 16, URV–LRV (20 –4)

  5. Conversion Formula • Output = % Span x Span + LRV • If input is at 75% of Span Than; • Output = .75 x (20 – 4) + 4 • Output = 8 milliamp

  6. Transmitter Documentation

  7. Transmitter Documentation Model and Serial Number Rosemount 1151 - SDP-URD476

  8. Transmitter Documentation Model and Serial Number Rosemount 1151 - SDP-URD476 Range Code Range 4: 150 inH2O

  9. Transmitter Documentation Model and Serial Number Rosemount 1151 - SDP-URD476 Range Code Range 4: 150 in H2O Maximum Working Pressure MWP: 2000 PSI

  10. Example Current Loop 2200 ºC ZERO SPAN • Sensor Input • Pressure + – 4 – 20 ma 24 V Loop Supply 2 Wire Transmitter With permission from Fluke Education Partnership Program

  11. Calibration Diagram Manometer 0 –5 Volt Pump 250 ohm H D/P Cell L ma Vent + - 24 volt DC

  12. Calibrating D/P Cell Video • To view the video, click the YouTube link below: http://www.youtube.com/watch?v=Ceg24baacPA

  13. Calibration Summary • % Input = % Output • Output = % Span x Span + LRV • Document All Data • Calibrate to Percent of Error • Output must be Linier

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