RTD Calibration

8/6/2019 RTD Calibration

http://slidepdf.com/reader/full/rtd-calibration 1/20

RTDRE-CALIBRATION

( -aj jad Rasool Chaudhry M08( -aj jad Rasool Chaudhry M08- )G 12)G 12

8/6/2019 RTD Calibration

http://slidepdf.com/reader/full/rtd-calibration 2/20

OutlineOutline

8/6/2019 RTD Calibration

http://slidepdf.com/reader/full/rtd-calibration 3/20

TemperatureTemperature

• QuantitativelyQuantitativelyexpresses theexpresses thecommon notionscommon notionsofof hothot andand coldcold ..

8/6/2019 RTD Calibration

http://slidepdf.com/reader/full/rtd-calibration 4/20

TemperatureTemperature

• A very importantA very importantparameter forparameter forprocessprocessengineersengineers

8/6/2019 RTD Calibration

http://slidepdf.com/reader/full/rtd-calibration 5/20

Temperature MeasurementTemperature Measurement

““ It is time to turn up the heat but first youIt is time to turn up the heat but first youmust learn how to measure it”must learn how to measure it”

8/6/2019 RTD Calibration

http://slidepdf.com/reader/full/rtd-calibration 6/20

Temperature MeasurementTemperature Measurement

o

Liquid Filled ThermometersLiquid Filled Thermometers

o ThermocouplesThermocouples

o ThermistorsThermistors

o Resistance Thermal Devices (RTDs)Resistance Thermal Devices (RTDs)

o Optical TechniquesOptical Techniques

8/6/2019 RTD Calibration

http://slidepdf.com/reader/full/rtd-calibration 7/20

RTDsRTDs

• Utilizes the factUtilizes the fact

thatthatresistance ofresistance ofa metala metalchanges withchanges withtemperature.temperature.

•

BasicsBasics

RR TT = R= R oo (1+(1+ αα T)T)

8/6/2019 RTD Calibration

http://slidepdf.com/reader/full/rtd-calibration 8/20

RTDsRTDsBasicsBasics

8/6/2019 RTD Calibration

http://slidepdf.com/reader/full/rtd-calibration 9/20

RTDsRTDsBasicsBasics

8/6/2019 RTD Calibration

http://slidepdf.com/reader/full/rtd-calibration 10/20

RTDsRTDs

• Carbon Resistors/RTDsCarbon Resistors/RTDs

• Film Resistors? RTDsFilm Resistors? RTDs

• Wire wound RTDsWire wound RTDs

• Coil Element RTDsCoil Element RTDs

TypesTypes

8/6/2019 RTD Calibration

http://slidepdf.com/reader/full/rtd-calibration 11/20

RTDsRTDsTypesTypes

• Carbon Resistors/RTDsCarbon Resistors/RTDs

8/6/2019 RTD Calibration

http://slidepdf.com/reader/full/rtd-calibration 12/20

RTDsRTDsTypesTypes

• Film Resistors/RTDsFilm Resistors/RTDs

8/6/2019 RTD Calibration

http://slidepdf.com/reader/full/rtd-calibration 13/20

RTDsRTDsTypesTypes

• Wire Wound RTDsWire Wound RTDs

8/6/2019 RTD Calibration

http://slidepdf.com/reader/full/rtd-calibration 14/20

RTDsRTDsTypesTypes

• Carbon ResistorsCarbon Resistors

8/6/2019 RTD Calibration

http://slidepdf.com/reader/full/rtd-calibration 15/20

-Re Calibration-Re Calibration

Re-Adjusting the output orRe-Adjusting the output or

indication on an instrumentindication on an instrument

to agree with value of theto agree with value of the

applied standardapplied standard

8/6/2019 RTD Calibration

http://slidepdf.com/reader/full/rtd-calibration 16/20

… Why to calibrate ??… Why to calibrate ??

with a new instrument with a new instrument

when a specified time period is elapsed when a specified time period is elapsed when a specified usage (operating when a specified usage (operatinghours) has elapsedhours) has elapsed

when an instrument has had a shock or when an instrument has had a shock orvibrationvibration which potentially may have put which potentially may have putit out of calibrationit out of calibrationsudden changes in weathersudden changes in weather

whenever observations appear whenever observations appearquestionablequestionable

Calibration can be called for:

8/6/2019 RTD Calibration

http://slidepdf.com/reader/full/rtd-calibration 17/20

Experimental WorkExperimental Work

8/6/2019 RTD Calibration

http://slidepdf.com/reader/full/rtd-calibration 18/20

Experimental WorkExperimental WorkResultsResults

8/6/2019 RTD Calibration

http://slidepdf.com/reader/full/rtd-calibration 19/20

Experimental WorkExperimental WorkResultsResults

8/6/2019 RTD Calibration

http://slidepdf.com/reader/full/rtd-calibration 20/20

&Questions Answers&Questions Answers