What is the working principle of platinum resistance thermometer?
It works on the principle that the resistance of platinum changes with the change of temperature. The thermometer measures the temperature over the range of 200°C to1200°C. The platinum is an unreactive metal and can easily be drawn into fine wires.
What is the working principle of resistance thermometer?
An RTD works by using a basic principle; as the temperature of a metal increases, so does the resistance to the flow of electricity. An electrical current is passed through the sensor, the resistance element is used to measure the resistance of the current being passed through it.
What is platinum resistance temperature?
Up to 950°C, the platinum resistance thermometer is often used as a reference standard. Above that temperature, up to about 1750°C, a type S (platinum/rhodium–platinum) thermocouple is usually employed.
What is working principle thermometer?
A thermometer works on the principle that solids and liquids expand on heating. As the temperature rises, mercury expands causing it to move upwards and depict the temperature.
Where are platinum resistance thermometers used?
In the chemical industry—one of the largest users of platinum resistance thermometers—the instruments are used both for precise laboratory measurements and for indication, recording and control in process plants throughout the factory.
What is platinum resistance?
(PLA-tih-num reh-ZIH-stunt KAN-ser) Cancer that responds at first to treatment with drugs that contain the metal platinum, such as cisplatin and carboplatin, but then comes back within a certain period. For example, ovarian cancer that comes back within 6 months after treatment is considered platinum resistant.
What are the advantages of platinum resistance thermometer?
Advantages of Platinum Resistance thermometer:- 1 High accuracy of measurement 2 Measurements of temperature can be made over a wide range of temperature i.e. from – 2600C to 12000C. → Disadvantages of Platinum Resistance thermometer:- 1 High Cost 2 Requires additional equipment such as bridge circuit Power supply etc.
How is the principle of expansion used in a thermometer for measuring temperature?
The tube is made thin to get a more precise reading. The tube is so thin that the liquid can either move up or down. And this is where thermal expansion comes in as the liquid will rise or fall (generally rise for increased temperature) when the liquid expands or contracts according to temperature.
Why is platinum used for industrial temperature measurement?
This is because platinum, being a principle metal, has the largest available temperature range and the most stable resistance vs temperature relationship.
What is platinum sensitivity?
(PLA-tih-num SEN-sih-tiv KAN-ser) Cancer that responds to treatment with anticancer drugs that contain the metal platinum, such as cisplatin and carboplatin. Some cancers that respond to treatment but then come back after a certain period may also be considered platinum sensitive.
What are advantages and disadvantages of platinum resistance thermometer?
Where are resistance thermometers used?
Due to their accuracy and robustness, they are extensively used as in-line thermometers in the food industry. Within a wide range of temperatures the resistance of metals increases linearly with temperature. The measuring element is usually made of platinum.
Which law is used in thermometer?
The zeroth law of thermodynamics
Thermometers. The zeroth law of thermodynamics defines temperature and makes thermometers possible. For a thermometer to be useful, though, it must be first calibrated.
What is the difference between platinum resistant and platinum sensitive?
Patients with a PFI of six months or longer are considered to have chemotherapy-sensitive disease (often also termed “platinum-sensitive”). Patients with a PFI of less than six months are considered to have chemotherapy-resistant disease (often also termed “platinum-resistant”).
Who invented platinum resistance thermometer?
In 1871 Werner von Siemens invented the Platinum Resistance Temperature Detector and presented a three-term interpolation formula. Siemens’ RTD rapidly fell out of favour due to the instability of the temperature reading. Hugh Longbourne Callendar developed the first commercially successful platinum RTD in 1885.
Why are resistance thermometers used?
A resistance thermometer calculates the temperature by accurately measuring the resistance value of the internal resistive element. As such, it is necessary to minimize the effect of the conductor resistance as much as possible.
What is the formula of resistance thermometer?
The Equation for Resistance Thermometer C = mean resistance temperature coefficient between 0 ⁰C and 100 ⁰C. δ lies between 1.488 to 1.498. The temperature range of a platinum resistance thermometer is between 100 ⁰C to 650 ⁰C.