PDF A Procedure for the Effective -Temperature - Calibration of the liquid in glass, Gas (vapor) pressure and Bi-metal Devices
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Calibration of the liquid in glass, Gas (vapor) pressure and Bi-metal Devices

Temperature

Sample Work Instructions Work Instructions Calibration of a Liquid in Glass Thermometer 7 6 Control of Inspection, Measuring and Test Equipment 7 6 02 Correct Application of Liquid in Glass Thermometers for Accurate This article deals with the role of liquid

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Gas (vapor) pressure and Bi-metal Devices

Description

Introduction: All the experiments are performed using the Temperature Measurement and Calibra on apparatus TD400 which is shown in Figure 1

When the temperature increases,

the liquid expands in the thin tube and when the temperature decreases,

the liquids contracts in the thin tube

The most liquid used is Hg,

but it has been prevented earlier because of it toxicity,

and now the liquid which used is some type of alcohol such that pure ethanol,

depending on manufacture and working temperature range

The gas thermometer works on the principle of unknown volume expansion rate of gas (vapor of fluid) for a known raise in temperature

As the gas (vapor above a small volume of fluid) expands with a rise in temperature,

its pressure increases and pushes against a mechanical mechanism that turns a calibrated dial

The bi-metal thermometer wirks on the priciple of different expansion rates of two different metal strips fixed (laminated) togather to form a thicker strip that is a composite of the two metals

As temperature increases,

one metal expands more than the other and the composite bends,

pushing a calibrated mechanical dial

Objectives:   

Show the linearity and accuracy of the liquid in glass thermometer by calibration against the reference sensor

Show the linearity and accuracy of Gas (vapor) pressure thermometer by calibration against the reference sensor

Show the linearity and accuracy of the Bi-metal thermometer by calibration against the reference sensor

Equipment: a

Procedure: 1

Create a blank results table,

Note: if you use VDAS,

the so ware will log your results,

so you do not need to draw a table

You can also the software to create extra calculated fields of deviation and error

Setup the heater and icebox

Select a liquid in glass thermometer

Put the reference sensor and thermometer into the icebox (through the holes in its lid)

Wait few minutes for the reading to stablize and record them (the reference temperature should be between 0 oC and 1 oC

Now put both devices into the heater tannk (through the holes in its lid)

Switch on the heater and note the reference temperature

Stop the experiment and siwtch off the heater when the reference temprature reaches 100 oC

Repeat the experiment for the other gas (vapor) pressure thermometer and bimetal thermometer

Allow the heater water to cool down (and change it if necessary for cooler water) between tests

Results and Discussion a

Liquids in glass thermometer: Table 1 Results for liquid in glass thermometer Liquids in glass thermometer Reference Indicated Deviation Error Temperature Temperature (difference) (oC) (oC) (oC) (%) 0

Indicated Temperature (oC)

Liquids in glass thermometer 120 100 80 60 40 20 0 0

REFERANCE TEMERTURE (oC)

Gas (vapor) Thermometer: Table 2 Results for Gas (vapor) thermometer Vapor thermometer Indicated Deviation Reference Temperature Temperature (difference) (oC) (oC) (oC) 0 30 40 50 60 70 80 90 100

Error (%) ` 13% 10% 6% 5% 4% 1% 1% 2%

Indicated Temperature (oC)

VAPOR thermometer 120 100 80 60 40 20 0 0

REFERANCE TEMERTURE (oC)

Bi-metal Thermometer:

Table 3 Results for bi-metal thermometer BI-METAL thermometer Indicated Deviation Reference Temperature Temperature (difference) o ( C) (oC) (oC) 0 30 40 50 60 70 80 90 100

Error (%) 0% 10% 10% 4% 3% 0% 0% 3% 5%

BI-METAL thermometer Indicated Temperatur (oC)

REFERANCE TEMERTURE (oC)

Conclusions: We see that all of three types have some error,

but deviate from any type to other one

at Tref equal to 70 oC,the Bi-metal has the lowest error,

followed by Gas (vapor) Thermometer and Liquids in glass thermometer,

References: 1

TecQuibment user manuel

org/wiki/Alcohol_thermometer( last access 5th May 2013 ) 6