Hello experts, I hope you can help me with the following problem. There is one huge pipe (diameter about 3 meters). In that pipe there is a flow of mixture ash and air. That mixture is very hot (about 300 °C) and abrasive. I need to measure temperature of that mixture. I placed thermocouple with its protective thermowell. I was surprised that thermowell was damaged soon. It seems that velocity in pipe is so large that in combination with abrasive ash, it practically cut off the thermowell in few weeks. Thermo well is placed normal to the pipe (90°). There was some guy who though he'd solve the problem by putting something in front of the thermowell to protect it, so he placed heavy thick steel pipe whose diameter is about 3-4 cm bigger then diamter of the thermowell. He was reasoning that mixture's flow will first hit that protective pipe, disperse to the right and left and in such way protect thermocouple. This was better solution and now it can take about 3-4 months. I wonder if this can be better. Information about temperature is used in control logic so, real information must be fast and accurate. Heavy armor about thermowell is expensive and cause dead time. Can you suggest some kind of smart protection using physics knowledge? So far, it is made like this: ,,,,,,----> flow ---->O o - thermowell ,,,,,,,,,,,,,,| protective pipe What would you suggest? Basically I need something that will disperse ash particles and slow them down not to damage thermowell, or at lest increase periods of maintenance. Thank you very much!