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Su Solberg said:I wonder whether the accuracy of that thermometer with a type K sensor is as follow:
encironment: 90'C
Sensor type: resistance sensor
so the accuracy = +/- 90*0.005+0.5 = +/-0.95'C
Thanks for your help.
redargon said:It's a K-type thermocouple:
Usually accuracies are measured as a function of the full scale (FS). In the first instance this would be a full scale of 1350°C (from -50 to 1300). so +- 0.2% of that would be 2.7°C then plus the 0.5°C would be +- 3.2°C. Or it is +- 2.7°C + 0.5, which would be +3.2/-2.2°C So if it reads 90°C it the temperature could actually lie anywhere between 86.8°C and 93.2°C... or between 87.8°C and 93.2°C
redargon said:No, I don't think so. From what I know, typical k-type thermocouples have between +-1.5°C and +-2.5°C accuracy in the lower temperatures (-50°C to 350°C) and around 0.4 to 0.75% of the temperature for higher temperatures (above 350°C). So, 0.64°C seems a little low for a typical K-type.
if you want something more accurate, i would suggest a Pt100 temperature sensor, although it depends on your situation and what range you want to measure and what accuracy you really require.
The accuracy of a thermometer is determined by comparing its readings to a standardized reference thermometer at different temperatures. The difference between the readings of the two thermometers is then calculated, and this is known as the thermometer's accuracy.
The accuracy of a thermometer can be affected by various factors, such as the quality of the materials used to make the thermometer, the calibration process, and environmental conditions like humidity and altitude. Mechanical shock or mishandling of the thermometer can also affect its accuracy.
It is recommended to calibrate a thermometer at least once a year or whenever there are significant changes in temperature readings. If a thermometer is used frequently or in critical applications, it may need to be calibrated more frequently.
While the accuracy of a thermometer is determined by its design and construction, there are some steps that can be taken to improve its accuracy. These include proper calibration, regular maintenance, and using the thermometer according to the manufacturer's instructions.
The accuracy of a thermometer can vary depending on its type. Generally, digital thermometers tend to have higher accuracy compared to analog thermometers. However, the accuracy of a thermometer ultimately depends on its design, calibration, and use.