How to Achieve Accurate Temperature Measurement

Accuracy in temperature measurement is essential for many industries, from food and beverage production to medical research. While many variables can affect accuracy, the best way to ensure a precise measurement is to employ the proper techniques and equipment. This blog will explore some of the most effective methods to achieve better temperature measurement accuracy. From the latest technological innovations to simple adjustments in technique, we’ll uncover the secrets to successful temperature measurement.


Temperature measurement is an essential part of most industries. The right temperature must be maintained for the particular industrial process or procedure to ensure accuracy and precision. However, how do you ensure that the measured temperature is accurate and precise? By following specific guidelines, you can guarantee temperature accuracy and precision.

Key to Accurate Temperature Measurement

Ensuring accurate temperature readings is critical to the success of any industrial process. There are three fundamental guidelines to ensure accuracy when measuring temperature.

1. Choosing the Right Sensor or Thermocouple

Selecting a suitable sensor or thermocouple is essential for accurate temperature measurement. However, depending on the type of sensor chosen, a certain amount of uncertainty is associated with each size. For instance, when measuring temperatures of 260 °C, a Class A 100Ω Pt RTD (Resistance Temperature Detector) has an uncertainty of +/-0.67 °C, while a standard grade J or K thermocouple has a delay of +/-2.2 °C.

By choosing a premium-grade thermocouple over a standard-grade one, you can reduce the error rate by almost 50%. However, if you invest in a Class A RTD, the accuracy of your temperature readings will be further enhanced, and the error rate will be much lower.

2. Selection of a suitable Thermocouple extension wire.

Selecting the correct thermocouple extension wire is vital to ensure accurate temperature measurements. Contamination can occur if the extension wire is exposed to temperatures that exceed or fall below its tolerance, leading to increased drift and uncertainty. To avoid this, you can manually perform a calibration or replace the extension wire.

You can choose between remote I/O hardware or temperature transmitters when replacing the extension wire. Both options can help ensure accurate readings and preserve the accuracy of your temperature measurements. Consider the application, budget, and necessary features when selecting the correct thermocouple extension wire.

3. Getting rid of the RTD Lead Wire Error.

RTDs are temperature-sensing devices that use copper wires to measure resistance. When the lead wires of an RTD corrode in a plant environment, the resistance of the copper wire changes and can cause errors in the temperature readings. To overcome this problem, RTDs with a four-wire configuration is used to ensure temperature measurement accuracy and precision. The four-wire RTDs eliminate lead wire error by providing an extra reference wire that can be used to measure the copper wire’s resistance and counteract any corrosion resistance changes. This ensures that the temperature readings are always accurate and reliable.


In conclusion, by following the guidelines outlined and sourcing temperature measurement devices from a trusted supplier such as BCST, it is possible to achieve extreme accuracy in temperature measurement during industrial processes. Accurate temperature measurement is essential for efficient operations, making it an important factor to consider when selecting suppliers and devices.

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