Resistance thermometer Time Constant

Resistance thermometer Time Constant

A time constant indicates the responsiveness of a resistance thermometer to temperature change.

A common expression is the time it takes a thermometer to reflect 63.2% of a step temperature change in moving water.

Response speed depends on the mass of the thermometer and the rate at which heat transfers from the outer surface to the sensing element.

A rapid time constant reduces errors in a system subject to rapid temperature changes.

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