1. TEMP MEASURING INSTRUMENTS
GLASS THERMOMETER
PR GAUGE THERMOMETER (Liquid vapour and gas)
DIFFERENTIAL EXPANSION ( Bimetallic thermometer)
ELECTRICAL RESISTANCE ( RTD – Resistance Temp Detector)
THERMOCOUPLE PYROMETER
OPTICAL PYROMETER
RADIATION PYROMETER
THERMISTOR

2. TEMP MEASUREMENT Temp is thermal state of body.
It is the property ,which tells us the degree of hotness or coldness measured along some temp scale
When a body is heated or cooled, various primary effects result. One of these results may be used for temp measurement
Change in physical state or phase ( solid , liquid and vapour)
Change in physical dimension
Variation in electrical properties
Seebeck effect
Bimetallic strip when heated , it bends in a direction of a metal having low coefficient of expansion
Change in intensity of total radiation emitted (PYROMETER)
Change in temp causes change in volume and Pr of gas

3. LIQUID IN GLASS THERMOMETER
RANGE( DEGREE CENTRIGRADE)
MERCURY
-35 TO 510
ALCOHOL
-80 TO 70
TOLUENE
-80 TO 100
PENTANE
-200 TO 30
CREOSOTE
-5 TO 200
MERCURY + NITROGEN
-95 TO 150 DEGREE F

4. FILLED SYSTEM THERMOMETER

5. BIMETAL – STRIP THERMOMETER

6. BIMETAL – STRIP THERMOMETER

7. VAPOUR PR THERMAL SYSTEM

8. VAPOUR PR THERMAL SYSTEM