Accurate measurements (up to 1/10 DIN ) at temperatures as high as 850 °C , require a specialized resistance temperature detector (RTD). Our ceramic wire wound Pt100 sensors, in mineral insulated cables, are the most accurate RTD’s for the upper temperature ranges. In addition these sensors are resistant to thermal shock and can withstand vibration at acceleration levels of up to 30g over the frequency range of 10Hz to 1kHz.
Platinum (Pt100) ceramic wire wound RTD sensors are manufactured by hand: Winding the fine platinum wire into a small coil until a resistance of 100 ohm has been reached (hence the name Pt100). The coil is inserted into a high purity alumina (aluminium oxide) ceramic tube. The excellent insulation properties of the aluminium oxide allows the wire wound Pt100 element to withstand high temperatures (up to 850°C). These sensors offer the widest temperature measuring range of all platinum temperature sensors.
Ceramic wire wound sensors are also the most accurate temperature sensors available: some of the wire wound elements can even measure up to Class 1/10 DIN B. This means that ceramic wire wound pt100 sensors have a resistance of 100 ohms at 0°C with a tolerance of ±0.03°C. Because the relation between temperature and resistance is almost linear, ceramic wire wound Pt100 sensors are very stable. This combined with their very wide temperature measuring range makes them a suitable choice for many industries.
The outside diameter (OD) of the alumina tubes vary from 0.8mm to 4.5mm so they are even suitable for the thinnest mineral insulated RTD cables. The coil inside the ceramic wire wound sensors can move freely which gives it stability and excellent resistance to vibration. Acceleration levels of up to 30g over the frequency range of 10Hz to 1kHz are tolerated.
The ceramic wire wound sensors are the solution for processes requiring stability at high temperatures and excellent thermal shock resistance. Examples of such industries are chemical and power generation plants, analytical equipment and process monitoring.
Kamet are experts with regard to the application and configuration options and can advise you as to which of our extensive RTD product range would be the perfect match for your parameters. Our products include a variety of dimensions, temperature range as well as tolerance classes. We also have simplex and duplex variants.
Another kind of Pt100 RTD which we stock is a thin film Pt100 sensor. There is some overlap in the properties of both thin film and wire wound sensors. A thin film RTD is cheaper, has a very flat profile and is even more resistant to vibration.
However, in general terms if you need a very accurate RTD along a wide temperature range, especially at the upper ranges, the higher cost of a wire-wound resistor is worth the extra investment.
For a more detailed comparison of these two platinum RTD’s please visit our knowlegde base about RTD sensors. Alternatively, our advisors would be happy to assess your situation and help you select the ideal product.
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