The precise temperature measurement system with compensation of measuring cable influence

Abstract

The article presents an active bridge system that enables the solution of a significant prob-lem consisting in ensuring correct indications of temperature values in a wide measuring range for a Pt100 temperature sensor with properties defined by the standard (EN‐60751 + A2). The presented active bridge system combines the properties of the measuring amplifier with the stabilization of the current value in the branch in which the Pt100 sensor was placed. The article focuses on the comparison of the temperature measurement in a typical resistance bridge and the measurement made in the developed active bridge, which has also become the subject of a patent. For the per-formed tests, in which the correctness of the temperature measurement system operation was veri-fied, and on the basis of the obtained results, the quality of temperature measurements was com-pared in a wide range of changes.