The construction design of the ceramic RTD is comprised of a coil (depending on the two-spiral version) of platinum encapsulated in a high purity ceramic tube.
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The voids left between the platinum coil and the inner walls of the tube are filled with a material that enables the platinum contraction or expansion during temperature variations.
That is precisely the main advantage of this type of construction as, the effects of hysteresis and permanent changes in electrical resistance values are considerably minimized, in addition to obtaining remarkable stability over time.
This construction also ensures protection of the platinum coil from external pressures and forces. Ceramic sensors can be used over a wide temperature range, from -200°C to +960°C, depending on configuration. Tolerances available on ceramic sensors range from Class 2B for W0.6 to 1/10 for W0.3, with different temperature coefficients such as 0.3850, 0.3916 or 0.3925 ohm/K.
CWW (CERAMIC WIRE WOUND)
Due to their design, ceramic-type platinum sensors offer high durability, stability, and different temperature coefficients (TC: 3916ppm) for coiled wires. They also meet diverse applications, such as laboratories, process technology, and high-value-added equipment.
Applications requiring high-precision measurement should be developed considering CWW and 4 extension wires, although the 3-wire construction is more commonly found. In other words, for applications demanding high-precision measurement, the sensor should be built with CWW. Although the 3-wire electrical connection is commonly used, the 4-wire connection is the most accurate.
We can also offer versions with two dual sensors in a single ceramic body. Just like the individual sensors, the two dual sensors are extremely durable and robust against external pressures. Our sensors measure the temperature of gases, liquids, and solids, from -196 ºC to 850 ºC.