Essay on THERMISTOR CALIBRATION Lab

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Essay on THERMISTOR CALIBRATION Lab

ABSTRACT.

While recordings of the sensors voltage were made by the  oscilloscope when the thermistor and thermocouple were in a water bath. The sensors were taken in room temperature, in colder and warmer environment. The time constants were established and recorded in the tables provided.  Three axes were measured for impluse response by an acceloremeter hooked to an oscilloscope. To eliminate error the oscilloscope was callibrated for error.

PROCEDURE.Essay on THERMISTOR CALIBRATION Lab

100 ml tap water was placed in a 200ml beaker. This beaker and water were to be the testing environment. To measure the temperature of the environment, a glass thermometer was used by dipping it into the beaker containing water.

The beaker was then placed on a corning, model PC-200 hot plate and the temperature was set. The temperature at each testing environment was recorded at each stage. The changing of the testing environment from room to hot temperature required that a thermistor and a thermocouple be placed on an oscilloscope at unique times too.

The next step was to create a cold environment. This was done by mixing ice cold water and tap water in a 1000 ml beaker but the water was 600ml in volume. A glass thermometer was also used to take temperature and the recordings recorded. The thermistor, thermocouple and oscilloscope were used as described in previous steps to determine  the impulse response.

 

FINDINGS AND DISCUSSION.Essay on THERMISTOR CALIBRATION Lab

An average of 1.8s of time constant was recorded by the thermistor in the hot water. In the ice bath a constant of 2.0s was recorded. The thermocouple recorded a constant 36ms in both warm and cold environment. Comparing the thermistor and thermocouple showed that the thermocouple was noisy and less efficient in response compared to the thermistor.

CONCLUSION

It was an experiment excellently done and results taken in accuracy and effectively analysed.

Recommendations were that a thermistor should be used if less noise is required.

 

Initial temperature (C) Final temperature Time constant
22 44 1.6
22 40 1.8

 

 

22 44 2.0
22 2 2.0
22 3 2.3

 

       
       
       

 

Test Start at Finish at Thermistor Time

Constant

1. 22 19 Thermistor 1 1.4
2. 22 44 Thermistor 2 1.6
3. 22 40 Map001 1.8
4. 22 2 Map 003 2.0
5. 22 3 Map 004 2.2
6. 22 44 Map 005 2.0
         
         
Test Start at Finish at Thermistor  
1. 22 5 Map 009 30
2. 22 5 Map 010 60
3. 22 35 Map 011 40
4. 22 35 Map 012 50