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Temperature Coefficient of Resistance (α) Instrumentation Tools
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Home / Temperature Measurement / Temperature Coe cient of Resistance (α)
TEMPERATURE MEASUREMENT
Temperature Coef cient of Resistance (α) S Bharadwaj Reddy
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A Resistive Temperature Detector (RTD) is a special temperature-sensing element made of ne metal wire, the electrical resistance of which changes with temperature as approximated by the following formula:
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RT
Where, RT = Resistance of RTD at given temperature T (ohms) Rref = Resistance of RTD at the reference temperature Tref (ohms) α = Temperature coe cient of resistance (ohms per ohm/degree)
Categor The following example shows how to use this formula to calculate the resistance of a “100 ohm” platinum RTD with a temperature coe cient value of 0.00392 at a temperature of 35 degrees Celsius:
Select Ca
RT = 100 [1 + (0.00392)(35o C − 0o C)] RT = 100 [1 + 0.1372] RT = 100 [1.1372] RT = 113.72 ALL
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Due to nonlinearities in the RTD’s behavior, this linear RTD formula is only an approximation. A better approximation is the Callendar-van Dusen formula, which introduces second, third, and fourth-degree for a better t:
C RT
RT = Rref (1 + AT + BT2 − 100CT3 + CT4) for temperatures ranging −200 oC < T < 0 oC and RT = Rref (1+AT +BT2) for temperatures ranging 0 oC < T < 661 oC,
both assuming Tref = 0 oC. The A, B, and C coe cients vary with the speci c type of RTD, equivalent in role to α in the linear RTD formula. Water’s melting/freezing point is the standard reference temperature for most RTDs. Here are some typical values of α for common metals:
Like our
Nickel = 0.00672 Ω/ΩoC Tungsten = 0.0045 Ω/ΩoC Silver = 0.0041 Ω/ΩoC Gold = 0.0040 Ω/ΩoC Platinum = 0.00392
Like P
Ω/ΩoC
Copper = 0.0038 Ω/ΩoC
Latest C
As mentioned previously, platinum is a common wire material for industrial RTD construction. The alpha (α) value for platinum varies according to the alloying of the metal. For “reference grade” platinum wire, the most common alpha value is 0.003902. Industrial-grade platinum alloy RTD wire is commonly available in two di erent coe cient values: 0.00385 (the “European” alpha value) and 0.00392 (the “American” alpha value), of which the “European” value of 0.00385 is most commonly used (even in the United States!).
smita so,much u
Iliyas Conductiv
Satheesh An alternative to mathematically predicting the resistance of an RTD is to simply look up its predicted resistance versus temperature in a table of values published for that RTD type. Tables capture the nuances of an RTD’s non-linearity without adding any mathematical complexity: simply look up the resistance corresponding to a given temperature, or vice-versa. If a value falls between two nearest entries in the table, you may interpolate the nd the desired value, regarding the two nearest table entries as end-points de ning a line segment, calculating the point you desire along that line. 100 Ω is a very common reference resistance (Rref at 0 degrees Celsius) for industrial RTDs. 1000 Ω is another common reference resistance, and some industrial RTDs have reference resistances as low as 10 Ω . Compared to thermistors with their tens or even hundreds of thousands of ohms’ resistance, an RTD’s resistance is comparatively small. This can cause problems with measurement, since the wires connecting an RTD to its ohmmeter possess their own resistance, which will be a more substantial percentage of the total circuit resistance than for a thermistor.
Very usefu
Instrume Sir, This w getting kn
m.k dear sir it your e or
S Bharadw Please ch category..
shabbir no any da transmitte
Credits : Tony R. Kuphaldt – Creative Commons Attribution 4.0 License
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Temperature Coefficient of Resistance (α) Instrumentation Tools
About
ALL
us
Disclaimer
ANIMATION
Copyright
BASICS
Subscribe
MEASUREMENT
Submit Articles
Forum
CONTROL SYSTEMS
Helping Hand
Part Time Job
Q&A
ELECTRONICS
ELECTRICAL
TOOLS
MORE
Ads by Google
Formula
RTD Calibration
Level Transm
Calibration Procedure
PT100 RTD Sensor
Flow Transm
Home / Temperature Measurement / Temperature Coe cient of Resistance (α)
TEMPERATURE MEASUREMENT
Temperature Coef cient of Resistance (α) S Bharadwaj Reddy
Like 49
Leave a comment
Share Share
Tweet
0
Share
6
A Resistive Temperature Detector (RTD) is a special temperature-sensing element made of ne metal wire, the electrical resistance of which changes with temperature as approximated by the following formula:
Ads by Go
RT
Where, RT = Resistance of RTD at given temperature T (ohms) Rref = Resistance of RTD at the reference temperature Tref (ohms) α = Temperature coe cient of resistance (ohms per ohm/degree)
Categor The following example shows how to use this formula to calculate the resistance of a “100 ohm” platinum RTD with a temperature coe cient value of 0.00392 at a temperature of 35 degrees Celsius:
Select Ca
RT = 100 [1 + (0.00392)(35o C − 0o C)] RT = 100 [1 + 0.1372] RT = 100 [1.1372] RT = 113.72 ALL
ANIMATION
BASICS
MEASUREMENT
CONTROL SYSTEMS
Q&A
https://instrumentationtools.com/temperature-coefficient-resistance-%ce%b1/#.WmtY1qinHIU
ELECTRONICS
ELECTRICAL
TOOLS
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1/4
1/26/2018
Temperature Coefficient of Resistance (α) Instrumentation Tools Ads by Go
Due to nonlinearities in the RTD’s behavior, this linear RTD formula is only an approximation. A better approximation is the Callendar-van Dusen formula, which introduces second, third, and fourth-degree for a better t:
C RT
RT = Rref (1 + AT + BT2 − 100CT3 + CT4) for temperatures ranging −200 oC < T < 0 oC and RT = Rref (1+AT +BT2) for temperatures ranging 0 oC < T < 661 oC,
both assuming Tref = 0 oC. The A, B, and C coe cients vary with the speci c type of RTD, equivalent in role to α in the linear RTD formula. Water’s melting/freezing point is the standard reference temperature for most RTDs. Here are some typical values of α for common metals:
Like our
Nickel = 0.00672 Ω/ΩoC Tungsten = 0.0045 Ω/ΩoC Silver = 0.0041 Ω/ΩoC Gold = 0.0040 Ω/ΩoC Platinum = 0.00392
Like P
Ω/ΩoC
Copper = 0.0038 Ω/ΩoC
Latest C
As mentioned previously, platinum is a common wire material for industrial RTD construction. The alpha (α) value for platinum varies according to the alloying of the metal. For “reference grade” platinum wire, the most common alpha value is 0.003902. Industrial-grade platinum alloy RTD wire is commonly available in two di erent coe cient values: 0.00385 (the “European” alpha value) and 0.00392 (the “American” alpha value), of which the “European” value of 0.00385 is most commonly used (even in the United States!).
smita so,much u
Iliyas Conductiv
Satheesh An alternative to mathematically predicting the resistance of an RTD is to simply look up its predicted resistance versus temperature in a table of values published for that RTD type. Tables capture the nuances of an RTD’s non-linearity without adding any mathematical complexity: simply look up the resistance corresponding to a given temperature, or vice-versa. If a value falls between two nearest entries in the table, you may interpolate the nd the desired value, regarding the two nearest table entries as end-points de ning a line segment, calculating the point you desire along that line. 100 Ω is a very common reference resistance (Rref at 0 degrees Celsius) for industrial RTDs. 1000 Ω is another common reference resistance, and some industrial RTDs have reference resistances as low as 10 Ω . Compared to thermistors with their tens or even hundreds of thousands of ohms’ resistance, an RTD’s resistance is comparatively small. This can cause problems with measurement, since the wires connecting an RTD to its ohmmeter possess their own resistance, which will be a more substantial percentage of the total circuit resistance than for a thermistor.
Very usefu
Instrume Sir, This w getting kn
m.k dear sir it your e or
S Bharadw Please ch category..
shabbir no any da transmitte
Credits : Tony R. Kuphaldt – Creative Commons Attribution 4.0 License
More
55
Inst Too
Inst Too
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ANIMATION
BASICS
MEASUREMENT
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