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Calibrating Transmitters Paul Wakeham

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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