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RTDRE-CALIBRATION
( -aj jad Rasool Chaudhry M08( -aj jad Rasool Chaudhry M08- )G 12)G 12
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OutlineOutline
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TemperatureTemperature
• QuantitativelyQuantitativelyexpresses theexpresses thecommon notionscommon notionsofof hothot andand coldcold ..
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TemperatureTemperature
• A very importantA very importantparameter forparameter forprocessprocessengineersengineers
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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”
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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
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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)
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RTDsRTDsBasicsBasics
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RTDsRTDsBasicsBasics
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RTDsRTDs
• Carbon Resistors/RTDsCarbon Resistors/RTDs
• Film Resistors? RTDsFilm Resistors? RTDs
• Wire wound RTDsWire wound RTDs
• Coil Element RTDsCoil Element RTDs
TypesTypes
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RTDsRTDsTypesTypes
• Carbon Resistors/RTDsCarbon Resistors/RTDs
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RTDsRTDsTypesTypes
• Film Resistors/RTDsFilm Resistors/RTDs
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RTDsRTDsTypesTypes
• Wire Wound RTDsWire Wound RTDs
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RTDsRTDsTypesTypes
• Carbon ResistorsCarbon Resistors
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-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
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… 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:
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Experimental WorkExperimental Work
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Experimental WorkExperimental WorkResultsResults
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Experimental WorkExperimental WorkResultsResults
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&Questions Answers&Questions Answers
