Platinum RTD Elements
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 confer high durability, stability and different temperature coefficients (TC: 3916ppm) for spiral wires. They also serve various applications, such as laboratory, process technology and high added value equipment.
Applications where high accuracy measurement is required must be built considering the CWW and 4-wire extension, however, the 3-wire construction is the most commonly found. In other words, for applications that require high accuracy measurement, the sensor must 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 dual sensor versions in a single ceramic body. Similar to the single sensors, the dual sensors are extremely durable and robust to external pressures. Our sensors measure the temperature of gases, liquids and solids, from 196°C to 850°C