High-accuracy temperature measurements call for PRTDs and precision delta-siqma ADCs

摘要

Advanced industrial and medical applications require temperature measurements with accuracies of ±1 to ±0.1 °C or better. You must perform this measurement with reasonable cost, over a wide range of temperature, and often with low power consumption. These applications commonly operate in temperature ranges of-200 to +1750°C and generally require the use of thermocouples and PRTDs (platinum resistance temperature detectors). When absolute accuracy and repeatability are critical over temperature ranges of-200 to +800°C, PRTDs are the best choices for precision industrial and medical applications. Platinum is stable, and corrosion and oxidation do not affect it. Nickel, copper, and other metals also can be used for RTDs, but those materials are less popular because they are less stable and repeatable than platinum.