Abstract
The article presents an active bridge system that enables the solution of a significant problem 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 performed tests, in which the correctness of the temperature measurement system operation was verified, and on the basis of the obtained results, the quality of temperature measurements was compared in a wide range of changes.
Highlights
Temperature sensors are among the most commonly used sensors because the physical quantity of temperature is measured, regulated, recorded, and monitored in a variety of environments and in most technological processes
The most common example of an resistance temperature detectors (RTDs) detector are Pt100 series temperature sensors, which have been used for many years to measure temperature in laboratory and industrial processes
From the analysis presented above, it follows that the structure of the active measuring bridge (Figure 2) with the stabilization of the current value in the bridge branch, in which the thermoresistor Rt is placed, provides the output voltage Uout in the form convenient for the substitution into Formula (8)
Summary
Temperature sensors are among the most commonly used sensors because the physical quantity of temperature is measured, regulated, recorded, and monitored in a variety of environments and in most technological processes. The following analysis of the values of voltages UB and UA for the passive bridge shown in Figure 1 is carried out in order to obtain a relationship, from which the temperature of a Pt100 thermoresistor can be calculated. By solving the quadratic Equation (7) the relation according to Equation (8) is obtained [15] It determines the temperature value TC of the thermoresistor depending on the resistance value Rt; TC. From the analysis presented above, it follows that the structure of the active measuring bridge (Figure 2) with the stabilization of the current value in the bridge branch, in which the thermoresistor Rt is placed, provides the output voltage Uout in the form convenient for the substitution into Formula (8).
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