INSTRUMENTATION

KELOMPOK 5

• Cecep Saepudin (111611008)• Muhammad Majid B. (111611020)• Nanda Auliana (111611021)• Septiadi Nugroho (111611029)

GLASS THERMOMETER

•THERMOMETER GLASS• function -> It is a

device used to measure the temperature with liquid in capillary coloum or glass

• Kind of Types of glass thermometer Mercury thermometer Alcohol thermometer Mixed thermometer

THERMOMETER MERCURY• The mercury will freeze at a temperature of -

38.83 ° C (-37.89 ° F) and can only be used at temperatures above it. Mercury, unlike water, does not expand when frozen so it does not break the glass tube, making it difficult to observe when it freezes

 

1. Excess mercury thermometer as filler include:

1. Mercury can absorb / take the heat from the temperature measured something.

2. Mercury has properties that do not wet the medium of glass on the thermometer.

3. Mercury can be seen easily because of its shiny.

4. Mercury possesses expansion / expand a regular basis from the temperature to the

temperature.

5. Mercury has a freezing point and boiling point range is remote, making it suitable for

measuring high temperatures.

 

THERMOMETER ALCOHOLAlcohol thermometer is a thermometer which use the alcohol as a

medium gauge, which is an alternative to mercury thermometers

with the same function. But it is not the same as the

mercury in a glass thermometer. Contents are non-

toxic and alcohol thermometer will evaporate fairly

quickly.

Advantages of alcohol than mercury thermometers are:

1) alcohol is more sensitive, because changes volumnya greater than mercury for the same temperature change. Thus, for the same temperature change, the change in length of mercury column larger,

2) alcohol can measure extremely cold temperatures, for example, the temperature at the poles, because the freezing point of alcohol is very low at-1120C.

MIXED THERMOMETER

Some companies use a mixture of gallium, indium, and tin (galinstan) instead of mercury.

How Thermometers WorkIn general, how the thermometer is as follows: When the temperature rises, the liquid in the bulb tube expands more than the glass that covered it. As a result, a thin thread which fluid is forced into the capillaries. Conversely, when the temperature drops, the liquid and the liquid shrinks thin tube that moves back down. The movement ends labeled thin liquid meniscus is read against a scale that indicates the temperature.

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