Abstract
In our earlier work we proposed a method to measure the temperature of the coal pipe of Coal Mills in PF Boiler by a continuous basis, In order to achieve, accurate measurements of coal pipe temperature, using the resistive transducers like resistance temperature detector (RTD), the small resistance changes linearly with temperature, but resistance measurement by using RTD using normal Wheatstone bridge circuit would have errors for the stray capacitance presents in between bridge nodal points and the ground. Hence, by the use of a modified operational amplifier based Wheatstone bridge network, these effects can be minimized. The bridge performance has been studied experimentally with RTD. It has been observed good linearity, repeatability and variable sensitivity over the wide range of temperature.
Highlights
The most important variables is temperature and it is always needed to measure and control for any process
The resistance of a resistive transducer is generally changing very small for the temperature changes and the stray capacitance between the ground and the bridge nodal points introduce error as it is comparable with the impedance of the sensor which is used for measurement
The coal pipe temperature has been measured in continuous basis for PF boiler system [1]
Summary
The most important variables is temperature and it is always needed to measure and control for any process. The resistance of a resistive transducer is generally changing very small for the temperature changes and the stray capacitance between the ground and the bridge nodal points introduce error as it is comparable with the impedance of the sensor which is used for measurement. For minimization of that error, a modified operational amplifier based AC Wheatstone Bridge has been designed. Over the years many scientist and researcher measured temperature using electronic circuits, Wheatstone’s bridge in different configurations etc. K.V. Santhosh et al has designed an adaptive calibrated circuit using RTD with an optimized Artificial Neural Network for temperature measurement [12]. In [13] some methods and techniques of temperature measurement are discussed. It has been observed that regular measurement is possible by this modified AC Wheatstone bridge network
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