Metal Resistance Thermometer

This thermometer is an instrument used to measure the temperature variation in a control room.

Working principle
In each metallic conductor, their resistance changes when its temperature is changed. By calculating the variation in resistance, the temperature variations may be calculated. The thermometer which utilizes this phenomenon is called “resistance thermometer”.

Construction
The construction of resistance thermometer detector is shown in figure. RTD uses platinum, nickel or copper as a resistance element. Generally, platinum wire is wound on either ceramic bobbin toform a resistance element. This resistance element is placed inside the hollow structure called protection tube. It is made up of stainless steel or carbon steel.

Internally lead wire is used to connect resistance element with external lead terminals. Lead wire covered by insulated tube for short circuit prevention. Fiber glass is used for low and medium temperature and a ceramic insulation for high temperature.

Protection tube is used to protect the resistance element and internal lead wires from ambient conditions. Protection tube is fitted with the mounting attachment to install the resistance temperature detector to measuring point.

Operation
Initial resistance is measured by using wheatstone bridge. Probe tip of the RTD is placed near the heat source. Outer cover uniformly distributes heat to sensing resistance element. As the temperature varies, the resistance of the material also varies. Now, final resistance is again measured. From the above measurement, variation in temperature can be calculated as follows, 
Rt = R0 ( 1+Dt) 
Dt = ( (Rt/R0)-1)/x

Where,

Rt = resistance at C. 
R0 = Resistance at room temperature. 
Dt = Difference in temperature. 
X = Temeprature coefficient of RTD material.

Thus from the above formula by knowing Rt, R0 and x, the difference in temperature can be calculated.

Advantages
Accuracy is more. 
More linear than thermocouple. 
No necessary for temperature compensation. 
Performance is stable for long period.

Disadvantages:
Expensive. 
Their change in temperature is very small even for large change in input temperature. 
External current source is required. 
Low sensitivity.

 

To know more about Similar Temperature measurement using Metal Resistance Thermometer visit Instrumentation Control Engineering Blog.

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1) Standing lateral hip abduction
2) Lateral glute walk
3) Standing hamstring curl
4) Lying lateral hip abduction
5) Glute bridge hip abduction
6) Standing front kicks
7) Standing back kicks
8) Squat lateral extensions
9) Quadruped hip extension
10) Prone hip extensions
11) Supine knee extension
12) Quadruped glute extension

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FitForceFX strongly recommends that you consult with your physician before beginning any exercise program.

You should be in good physical condition and be able to participate in the exercises shown.

You should understand that when participating in any exercise or exercise program, there is the possibility of physical injury. If you engage in this exercise or exercise program, you agree that you do so at your own risk, are voluntarily participating in these activities, assume all risk of injury to yourself, and agree to release and discharge FitForceFX from any and all claims or causes of action, known or unknown, arising out of FitForceFX’s negligence.

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