How to remove hysteresis from a temperature sensor

If the RTD reading is consistently lower than the water temperature, there may be hysteresis.In summary, the conversation is about an issue with an RTD (resistance temperature detector) in the lab that may have hysteresis affects. The speaker is looking for a way to confirm this without using another standard and suggests using a water bath and recording results while ramping up and down the temperature. They also mention considering the specific heat of the sensor or the water bath and suggest comparing the RTD reading to another thermometer's reading to check for hysteresis.
  • #1
Topher925
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I'm having an issue with an RTD in the lab that I think may have some hysteresis affects going on with it. I know RTDs can be prone to this if not used properly but is there any practical way to confirm this without using some other standard (The RTD is the most accurate temp sensor I have available)? I was thinking of putting the sensor in a water bath and then ramping the temp up and down a few times while recording the results in set time increments to see what would happen. Is there any other way of doing this while not going below room temp?
 
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  • #2
I think the problem with the RTD (resistance temperature detector) may be a delay in the correct reading due to the specific heat of the sensor or the water bath. Ramp up the temperature to a fixed value, and wait for the RTD to catch up. Simultaneously measure the water temperature with another thermometer.
 
  • #3


Hysteresis is a common issue with temperature sensors, especially RTDs, and it can significantly affect the accuracy of your measurements. Fortunately, there are some practical ways to remove hysteresis from a temperature sensor.

One approach, as you mentioned, is to perform a temperature cycling test in a controlled environment, such as a water bath. This will help you understand the hysteresis behavior of your sensor and determine the extent to which it is affecting your measurements. However, it is important to ensure that the temperature cycling is done gradually and consistently, as sudden changes in temperature can also introduce error.

Another method is to use a reference standard, such as a calibrated thermometer, to compare the readings of your temperature sensor. This will help you identify any discrepancies and determine if hysteresis is indeed the issue.

Additionally, it is important to ensure that your temperature sensor is being used and maintained correctly. RTDs are sensitive to factors such as vibration and electrical interference, so make sure to follow proper installation and handling procedures.

In some cases, hysteresis can also be reduced by implementing a compensation technique, such as using a software algorithm to adjust the readings based on the sensor's hysteresis behavior.

Overall, it is important to carefully monitor and understand the hysteresis behavior of your temperature sensor to ensure accurate and reliable measurements. By following these steps, you should be able to effectively remove hysteresis from your sensor and improve the accuracy of your results.
 

1. How does hysteresis affect temperature sensor readings?

Hysteresis is a phenomenon that causes a temperature sensor to have different output readings for the same input temperature, depending on whether the temperature is increasing or decreasing. This can lead to inaccurate and inconsistent readings.

2. What causes hysteresis in temperature sensors?

Hysteresis in temperature sensors is caused by the physical properties of the materials used in the sensor, such as the thermal mass and thermal conductivity. It can also be influenced by the design and construction of the sensor.

3. Can hysteresis be completely eliminated from a temperature sensor?

No, it is not possible to completely eliminate hysteresis from a temperature sensor. However, it can be minimized through careful design and selection of materials.

4. What techniques can be used to reduce hysteresis in temperature sensors?

There are several techniques that can be used to reduce hysteresis in temperature sensors, such as using materials with low thermal mass and high thermal conductivity, optimizing the sensor design, and implementing temperature compensation algorithms.

5. How often should a temperature sensor be calibrated to account for hysteresis?

The frequency of calibration for a temperature sensor to account for hysteresis will depend on the specific sensor and its usage. In general, it is recommended to calibrate the sensor at least once a year, or more frequently if it is used in critical applications.

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