A Resistance Thermometer is a temperatur sensor constructed from resistance wire wound into an element. It is used to measure temperature by means of a change in the electrical resistance with a rise or fall in temperature. The most popular wire used in Resistance Thermometers is platinum, although nickel or copper can also be used.
To provide protection against mechanical damage, the detector is usually mounted within a metallic sheath with ceramic or glass insulation to reduce vibration and to improve the speed of response. Mineral Insulated Resistance Thermometers also available.
Compared to Thermocouples and other temperature sensors, Resistance Thermometers offer long term stability and greater accuracy.
Mica Type Platinum RTD element is composed of a mica plate wound with a high purity platinum wire and sandwiched in between two mmica plates for insulation and, again, sandwiched in between two stainless steel plate springs and, then, fixed tightly by stainless steel wires.
Because of ease in handling and rigid structure, it is being used widely in industrial applications.
Operating Temp : -200 ~ 250oC
Rated Current : <5mA
Available Resistance : PT 100 Ω, JPT 100 Ω
Ceramic Bulb is composed of a coil-formed high purity platinum wire inserted into bores of a fine polished recrystalized Alumina ceramic body and fixed on its bottom by special heat resistant frit. As approximately 80% of the resistance wire is free if heat strain from temperature change, drift in resistiity is minimized and its reproducibility and long term stability are superior to any of conventional core-wound element.
Operating Temp : -200 ~ 650oC
Rated Current :Available Resistance : PT 25 Ω, PT 50 Ω, PT 100 Ω, PT 500 Ω, PT 1000 Ω, JPT 500 Ω, Ni 100, Ni 500, Cu 10, Cu 100
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The epoch-making CRZ Platinum Thin Film RTD element were developed successfully by making full use of the state-of-the-art high technologies such as thin film laying by sputtering, ultra fine patterining tecnology by photolithography and dry-etchinbg method, resistance value adjustable by digital trimming for accurate resistance.
Operating Temp : -50 ~ 400oC
Rated Current : <2mA
Available Resistance : PT 100 Ω, PT 1000 Ω
Selection of proper RTD suitable for the application is the most important factor. For precision measurement of temperature, consideration should be given to selection of RTD element, protection tube, structure and fitting (location) according to the respective resistance to that, corrosion, mechanical shock and other environment mental conditions.
Metal wire that changes its electric resistance to changes in temperature are utilized is called "Resistance Wire". This resistance wire, norally of platinum, is used to manufacture a temperature sensor called "Resistance Temperature Detector (RTD) Element". Generally speaking, RTD is composed of RTD element, lead wires, protection tune and terminals.
RTD element is connected to respective two wire leads. Although it is less expensive than other types, it is not recommendable for high precision measurement of temperature because it is susceptible to lead resistance and produces error.
One end of RTD element it is connected to two wire leads and the other end connected to single lead to eliminate the effect from lead resistance. This types is most widely used as a realible method in industrial applications.
RTD element is connected to respective two wire leads to remove the effect from lead resistance. This connection cancels lead resistance effect and is especially recommendable for high precision measurement of temperature but somewhat expensive than other types.