Photometric process measurement apparatus

Abstract

The invention refers to a photometric process measurement arrangement () with a photometric immersion probe () being electrically supplied with a probe supply voltage (Us) and comprising: a photometer flashlight source (), an impulse energy capacitor (), an electronic flyback-converter () for successively electrically charging the impulse energy capacitor () with numerous charging voltage quantums (Uq), whereas the flyback-converter () is provided with a converter switch () between a converter supply voltage port () and a transformer (), and a switching signal generator () for driving the converter switch () with a switching signal and comprising a standard duty cycle signal generator () for driving the converter switch () with a standard duty cycle value (D) and comprising a boost duty cycle signal generator () for alternatively driving the converter switch () with a higher boost duty cycle value (D), when the boost duty cycle signal generator () is activated. The switching signal generator () is provided with a supply voltage comparator () continuously comparing the probe supply voltage (Us) at the converter supply voltage port () and the memorized boost voltage value (Ub). The switching signal generator () activates the boost duty cycle signal generator () if the supply voltage comparator () determines that the supply voltage (Us) is below the boost voltage value (Ub).