Many materials can only withstand heat and other process conditions for a limited period. Numerous process parameters such as corrosive gases, turbulence or abrasion reduce the lifespan of a thermometer: The simultaneous effect of corrosion and abrasion is often the root cause of measurement failure. For users this means that they frequently need to replace thermocouples at critical measuring points, thus increasing the workload on the maintenance department and drive up costs. Longer operating times reduce the total cost of ownership considerably.
Temperatures of 1000°C and higher are required for glass, cement production and lime burning. The actual temperatures are of central importance to control and regulate the furnaces. If the required temperature is not reached and maintained at a stable level, it can impact the quality of the end product.
Measuring temperatures above 800°C places particularly high demands on the measuring technology used. In recent years, materials research has provided many new materials – both in the form of metal alloys and ceramic substances. Many of these have been examined and tested by Endress+Hauser, resulting in thermowells that withstand extreme process conditions far longer than previously thought possible. The new thermowell materials have been tested in applications where lifespan usually ranges from one day to just a few weeks – particularly the case in cement production or incineration plants. Frequently, conditions here are not only harsh, but also often change suddenly and unpredictably. The new developments have resulted in a considerable improvement in the thermowell lifespan by providing mechanical protection for the thermocouple and preventing the penetration of gases that initially cause temperature drifts and then unit failure as a result of corrosion.
Endress+Hauser has incorporated this research into the TAF high-temperature line. Given the possibilities of combining TAF11, TAF12 and TAF16 devices, the ideal thermometer can be found for every application. The best possible thermowell material makes the process more reliable, accurate, manageable and stable over the long term. The advantages this affords are obvious: maintenance costs are cut and product quality, process safety and safety at work improve.
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