What is the response time of a thermocouple?

Due to the design principle of thermocouples, the reaction of thermocouples to temperature changes lags behind the changes in ambient temperature or the temperature of the measured temperature.

Because the reaction action of thermocouples to temperature is the stress change of the temperature change of the body or the temperature measurement point.

Temperature is actually a kind of energy, and at present, the materials of thermocouples are almost homogeneous (must meet the corresponding national or international standards).

In this case, the capacity required to rise to the same temperature is proportional to the volume of the thermocouple.

The larger the volume, the more capacity is required, and the smaller the volume, the less energy is required.

Thermocouples of the same material have almost the same energy absorption capacity, so the smaller the volume of the thermocouple, the shorter the response time to temperature changes.

However, the initial response of thermocouples to temperature changes is almost meaningless for our test.

Our requirements for temperature testing are generally full-scale response, and the response time that the user expects is almost the time required to reach a stable test temperature.

However, the response time measured by our industry is almost not the full-scale response time. Generally speaking, it is only the time to reach 63.2% of the stable operating temperature.

For example, when the temperature is stable at 100 degrees, the time required for the thermocouple to reach 63.2 degrees is our response time.

In summary, the volume of the thermocouple is inversely proportional to the response time. The larger the volume, the longer the response time, and the smaller the volume, the shorter the response time.