An electronic device called a resistance temperature detector, sometimes referred to as a resistance thermometer or RTD is used to measure the resistance of an electrical wire in order to estimate the temperature. Getting this device from a reputable resistance temperature detector supplier is the best option if we wish to accurately monitor temperature over a large temperature range because it has good linear properties. A thermocouple or a thermistor are two more common electronics tools for temperature measurement.
The built of a resistance temperature detector
In order to attain a small size and improve thermal conductivity to shorten response times, the wire is commonly wound on a form (in a coil). This construction method yields a high rate of heat transfer. A resistance temperature detector supplier uses stainless steel sheaths or protective tubes to surround the coil to keep it safe.
The wire will expand and lengthen as a result of the temperature change, but the physical strain will be minimal. Increased tension results from increased wire strain. Inadvertently, this will cause a change in the wire’s resistance. Therefore, other than temperature variations, we don’t want to make any additional unwelcome modifications to the wire that might affect its resistance.
RTD maintenance can use this while the plant is running. For improved electrical insulation, mica is positioned in the space between the resistance wire and steel sheath. Resistance wire should be wound over the mica sheet with care since it is less strained.
Different types of resistance temperature detector sensors
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Thin-film
The process of creating a thin-film detector by a resistance temperature detector supplier involves depositing a thin layer of metal, often platinum, over a ceramic substrate. An electrical circuit pattern is laser cut or etched into the metal layer to achieve the required level of resistance. The entire element is then covered with a thin layer of protective glass before lead wires are added. The reliability and inexpensive cost of production of thin-film RTDs are its advantages. Additionally, compared to other resistance temperature detector kinds, they are more vibration damage resistant.
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Wire-wound
A tiny coil of extremely thin platinum wire makes up its sensing component. A ceramic or glass tube is frequently used to package wire coils; however, the wire can also be looped around the exterior of the housing material. The benefits of wire-wound RTDs are their great accuracy, the ability to measure extremely high temperatures with accuracy, and the ease with which those with glass cores can be submerged in a variety of liquids.
The working mechanism of an RTD
The RTD operates on a fundamental tenet. A metal’s resistance to the flow of electricity rises together with its temperature. The resistance element in the sensor measures the resistance of the current being passed through it when an electrical current is being carried through it. Electrical resistance rises along with the resistance element’s temperature. Ohms are units used to express electrical resistance. Based on the properties of the element, the resistance value can then be translated to temperature. An RTD typically responds within 0.5 to 5 seconds. They are, therefore, excellent candidates for a variety of applications.
What are the advantages of a resistance temperature detector?
A resistance temperature detector supplier offers the following features in an RTD:
- Excellent output
- Most precise
- Consistent and logical
- High precision
- Extremely repeatable
- Good accuracy
- High drift
- Compared to a thermocouple, more linear
- No additional wiring is needed, and installation and updating are simple
- Acessible for a variety of uses
- Used to gauge temperature differences
- No need for temperature adjustment
- Maintaining stability for a very long time
- Appropriate for distant indications
- Simple to check and calibrate, and no special extension cable is needed.
What are the differences among 2,3,4 RTDs?
Because there is no practical way to account for the resistance caused by the copper lead wires in two-wire RTDs, it is harder to appropriately connect the measured resistance to the temperature of the RTD element.
For industrial applications, three-wire RTDs are the most typical specification. Typically, a Wheatstone bridge measuring circuit is used by three-wire RTDs to account for lead wire resistance.
Due to the fact that they can fully correct for the resistance of the wires without specifically focusing on the length of each wire, 4 Wire RTDs are even more precise than their 3 Wire RTD counterparts.
Conclusion
Temperature is measured via a sensor called a resistance temperature detector, which functions according to the fundamental tenet that as a metal’s temperature rises, so does its resistance to the movement of electricity. In order to measure the resistance of the current being passed through the sensor, an electrical current is conducted through the resistance element. Tempens is considered one of the best resistance temperature detector suppliers, and you can visit the website to learn more about the functioning of RTDs.