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Thread: Filled system thermometer

  1. #1 Filled system thermometer 
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    I know that DIP effect is dynamic error .
    But What is DIP effect in Filled system thermometer
    Can any one able to make me understand about DIP effect in vapour pressure thermometer.


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  3. #2  
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    I've never heard of a "DIP effect," but any thermometer will have a dynamic error. In a vapor pressure thermometer there is a metal bulb filled with liquid. If there is a change in the temperature of the surroundings, then it takes time for the metal bulb to heat up or cool down, so the indicated temperature will lag behind the actual temperature.


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  4. #3  
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    When response time is critical, temperature detectors are sometimes tested by a "plunge test" where the thermometer is plunged into a fluid of a known temperature and the response to the step change is measured. From this a time constant is calculated. Perhaps this is the DIP effect you are referring to.
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  5. #4  
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    My faculty told me that when there's sudden temperature change then filled system thermometer will give some fluctuation and it will give some less reading then after it will increases.
    but i am not able to understand that why my pointer of sensor will decreases first?
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  6. #5  
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    I don't really know about this. I'm just speculating, but what could be happening is that the metal bulb expands when it is immersed in the hot fluid. It takes some time for the fluid inside the bulb to heat up to the temperature of the metal. So the first thing that happens is a decrease in the pressure of the vapor, due to expansion of the container, causing a decrease in indicated temperature. Then the fluid in the bulb heats up and the saturation pressure rises.
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  7. #6  
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    thank you.
    I am also thinking as yours that temp. increases suddenly the buld which expand before liquid attains that temp. so it will show fallen thmep.
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