ask:
In my experiment, a calcination process of 850 °C needs to be carried out in an experimental electric furnace ( muffle furnace ). The muffle furnace has been used for many years. I estimate that the temperature measuring device is not very accurate, but how can I determine the temperature measurement? The value is the exact value? That is for the high person willing to give pointers, thank you!
answer:
Before calcining, adjust the temperature to 850 degrees you need. When the ceramic fiber muffle heating lamp is extinguished, put the electronic temperature bar. If the temperature is measured for 3 minutes, there is no obvious change. See if the temperature is 850. Degree, if not, can read the reading after the second temperature rise (increase the temperature value) is stable. At this time, the temperature rise must be slow, not too much, otherwise the temperature rise is easy to cool down, until the temperature changes at 5 degrees around 850 degrees. Do not move the adjustment knob. On the second day, after the temperature of the muffle furnace drops to room temperature, it is warming up to see if it is still around 850. If not, the experiment is adjusted before the above method before each experiment. Electronic thermometer general laboratory Yes, you can ask, if you don't buy it, it's not too expensive, a few hundred sets, but be sure to pay attention to the use of the process, the copper probe is too hot to touch other objects, and then the shelf is naturally cooled, then Collapsed, otherwise it will cause inaccurate measurement in the future.
A2:
As long as the temperature controller displays and the actual furnace temperature is not out of tolerance (plus or minus 5 degrees) is accurate. So: If you have already displayed 850 degrees, take another thermocouple test (if you have accurate, there is a special standard thermocouple), the two temperature numbers are not overdone, just fine.
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