Title: Temperature measurement using RTD and Thermocouple.
Outcome:
(i)
To familiarize with temperature measurement system using RTD and
Thermocouple.
(ii)
To study and verify the response of RTD and Thermo couple.
(iii) To compare RTD with Thermocouple.
Equipment:
(i)
Temperature bath.
(ii)
Heating element.
(iii) Thermocouple K-Type
(iv)
RTD – PT 100
(v)
DMM.
(vi)
Digital Thermo meter
Procedure:
(i)
(ii)
(iii)
(iv)
(v)
(vi)
Immerse the RTD , Thermo couple and Thermometer in the given Temperature
bath.
Connect the RTD in to DMM to measure resistance of the RTD and Thermo
couple in to the mV meter to measure voltage in mV.
Make the bath temperature at 30° C by adding cold water. Switch on the heater
and increase the temperature of the bath by increasing the control Voltage knob.
Measure the output of the RTD and Thermo couple by increasing the bath
temperature in the interval of 10° C UP TO 100° C.
Tabulate the readings and convert the equivalent temperature.
For RTD PT -100
RT = RO (1 + α T )
Where :
RT
= Resistance
at Temperature (T° C )
RO = Resistance at 0° C
= 100 Ώ
α = Temperature coefficient for PT 100 = 0.0039
T= Temperature in ° C.
(vii) For K type Thermo couple refer table to find out equivalent temperature.
Tabulation:
S.No Actual
Temperature
°C
RTD ( PT 100)
Resistance
Ώ
Thermo couple K -Type
Temperature
°C
Output
mV
Task /Quiz
1. Plot the graph such that in X –Axis Temperature in ° C
Y –Axis Resistance output in Ώ for RTD
Y –axis Temperature in ° C for TC
(Use two graph)
2. Why platinum widely chosen as RTD material.
3. Calculate the resistance across PT-100 when temperature is 50° C.
4.
What is thermopile.?
.
Temperature
°C