Thank you for teaching us about the use of the instrument. I have a question. We at the Universidad del Valle, Colombia, have this same equipment and we calibrate the heat flow with a standard sample, calcium oxalate. Although the manufacturer of the equipment states that it can only do TG-DTG/DSC, it also gives results as TG-DTG/DTA, that is, instead of evaluating 2 or 3 signals (TG-DTG-DSC) as stated by the manufacturer, it gives a total of 4 types of signals (TG-DTG-DSC-DTA). Does the equipment you have do the same? 🍃
Without a direct example, I'm not sure I can confirm whether our instrument is doing the same. DTA and DSC are closely related techniques, with the difference being that DTA measures temperature differences between a sample and a reference, while DSC measures heat flow differences between a sample and a reference. Since the SDT650 measures temperature through both the sample and reference beams, it is quasi-DTA. However, it isn't optimized for that technique so I wouldn't use it as such.
Hi. TA (the manufacturer) recommends calibrating their instrument approximately every month. Calibration includes running known, high-purity standards to ensure the detectors are reporting the correct temperature, weight, and power values when a sample is being run. TA also recommends that if you change the pan type, gas type, gas flow, or heating rate, that you recalibrate. Each of these changes can affect how the machine detects power, temperature, and weight changes, and could potentially invalidate the calibration that was done previously. In my experience, changing gasses does not invalidate the calibration to a large degree. We regularly switch back and forth between air, nitrogen, and forming gas. We run all of those with our "Nitrogen" calibration and get little perceptible error. If you require a high degree of certainty in your results and your calibration is done with nitrogen, I recommend running a new calibration in air with the same parameters (pan type, heating rate, gas flow rate) as you wish to run your sample.
Thank you for teaching us about the use of the instrument. I have a question. We at the Universidad del Valle, Colombia, have this same equipment and we calibrate the heat flow with a standard sample, calcium oxalate. Although the manufacturer of the equipment states that it can only do TG-DTG/DSC, it also gives results as TG-DTG/DTA, that is, instead of evaluating 2 or 3 signals (TG-DTG-DSC) as stated by the manufacturer, it gives a total of 4 types of signals (TG-DTG-DSC-DTA). Does the equipment you have do the same? 🍃
Without a direct example, I'm not sure I can confirm whether our instrument is doing the same. DTA and DSC are closely related techniques, with the difference being that DTA measures temperature differences between a sample and a reference, while DSC measures heat flow differences between a sample and a reference. Since the SDT650 measures temperature through both the sample and reference beams, it is quasi-DTA. However, it isn't optimized for that technique so I wouldn't use it as such.
@@materialscharacterization4168 Thank you so much. Regards.
What do you mean by repeating calibration if I will run my sample under air instead of nitrogen
Hi. TA (the manufacturer) recommends calibrating their instrument approximately every month. Calibration includes running known, high-purity standards to ensure the detectors are reporting the correct temperature, weight, and power values when a sample is being run. TA also recommends that if you change the pan type, gas type, gas flow, or heating rate, that you recalibrate. Each of these changes can affect how the machine detects power, temperature, and weight changes, and could potentially invalidate the calibration that was done previously.
In my experience, changing gasses does not invalidate the calibration to a large degree. We regularly switch back and forth between air, nitrogen, and forming gas. We run all of those with our "Nitrogen" calibration and get little perceptible error. If you require a high degree of certainty in your results and your calibration is done with nitrogen, I recommend running a new calibration in air with the same parameters (pan type, heating rate, gas flow rate) as you wish to run your sample.