Hybrid Constant Temperature Regulator
R. Zdenek, T. Vladimir, S. Ivan, R. Michal · 2006
A powerful temperature difference measuring relation method using the high resistance ratio-metric sensors which is improving the accuracy, because it can solve such problems as dependence of a sensor's sensitivity to such factors as power supply instability, ambient temperature, humidity, pressure, effects of self-heating, aging, etc. was presented in [1]. Many similar derivate relation ratio measuring and monitoring systems were developed for biosensor applications etc. presented in [2], [3], [4] and for micro-calorimetric applications [5], [6] to time. The combination of these methods was studied for many application continual process constant temperature controlling. The process energy is balanced at defined constant temperature with the highest sensitivity and the lowest time-current delay using the special balance sensor consisted of electronic energy balance switching circuit with operational amplifier. The sensor heater contains of two asymmetric low resistance dividers in anti-parallel circuit wired to output of power linear operational amplifier: two of unequal resistors (Pt1 and Pt2) are temperature-dependent (Pt) and second couple of unequal resistors (R1 and R2) are temperature non-dependent (NiCr or AgPd).