simple,short and sweet presentation... copy & paste material for lazy and wanna be engineers

1. (EI&C Engineering Department)
By:-By:-
Ritu Sharma(12EEAEI047)Ritu Sharma(12EEAEI047)
Preeti Mahour(12EEAEI040)Preeti Mahour(12EEAEI040)
Government Engineering College,
Ajmer

2. A thermocouple is a temperature-measuring device
consisting of two dissimilar conductors that contact each
other at one or more spots. It produces a voltage when the
temperature of one of the spots differs from the reference
temperature at other parts of the circuit.

6. The Seebeck effect is the conversion of thermal energy/temperature differences directly
into electrical energy or electricity.
This effect measures the ease at which excess electrons will circulate in an electrical circuit
under the influence of thermal difference.
The change in the voltage is proportional to the temperature difference between the
junctions when the ends are connected to form a loop.

8. Ice-point
The result of the calibration is a table of EMF versus T values.
The integral is never directly evaluated.
Instead a polynomial curve fit to the calibration data gives:
( ) n
jnjjjj TbTbTbbTFE ++++== .....2
2100

9. With reference to the characteristics of pure Platinum
emf
Temperature

10. Types T, J, and K are most commonly used thermocouples
(see Table 16.8 of the “Handbook”).

11. 1.Steel industry
2.Gas appliance safety
3.Thermopile radiation sensors
4.Manufacturing
5.Power production
6.Thermoelectric cooling
7.Process plants
8.Thermocouple as vacuum gauge

14.  It is rugged in construction
 Covers a wide range of temperature
 Comparatively cheaper in cost
 Calibration can be easily checked
 Offers good reproducibility
 High speed of response
 Satisfactory measurement accuracy

15.  For accurate temperature measurements,
cold junction compensation is necessary
 The emf induced versus temperature
characteristics is somewhat non-linear
 Stray voltage pickup is possible
 In many applications, amplification of
signal is required