The construction project of ceramic RTD consists of a coil (depending on version two spirals) platinum encapsulated in a ceramic tube of high purity. The empty spaces left between the platinum coil and the inner walls of the tube are filled with a material that allows movement of contraction or expansion of platinum and during temperature variations.
CWW (CERAMIC WIRE WOUND)
Due to their design, the ceramic type platinum sensores allow for an extreme durability, stability and different temperature coefficients ( TC:3916ppm ) for spiralled wired. They also serve for various applications, with the main ones being laboratory, process technology and high value-added equipment.
The applications where a highly accurate measurement is necessary should be built with this sensor type and 4 extension wires, however, the 3-wire construction is the most commonly found.
Suggestion: When a high accuracy measurement is necessary, the applications should be built with this sensor type, and with 4 extension wires, although the 3-wire construction is the most commonly found.
It is like this: For applications requiring a high precision measurement the sensor should be built with the CWW. Although the electric connection with 3 wires is the most commonly found, that of 4 wires is the most precise one.
Structure depends on the sentence subject. Is “applications” the subject? We have two double sensor versions in a single ceramic body. They are extremely durable and robust to external pressures. Our sensors measure the temperature of gases, liquids and solids, from 196 ºC to 850 ºC in temperature. With a precision of … between 0.012Ω and 0.12Ω at 0 ºC or in Celsius degrees between 0.03°C a 0.3°C at 0°C.