In a test strip measuring system, such as for measuring the concentration of certain substances in body fluids, the system consists of a test strip onto which the fluid to be investigated is applied, and a measuring device into which the test strip is inserted for making the desired measurements. The limiting circuit compares the voltage error signal, the current error signal, and the power error signal to determine the error signal having the greatest value, and generates an input signal to a pulse width modulation comparator. At least one set including the at least one identifier and the collected information associated with the responses and requests is determined. Also described is a method for producing such a composition by a step of crystallizing a mannitol syrup followed by drying the mannitol crystals, a step of selecting particles, and a step of collecting a fraction of the powder composition including 72 to 99. The deaerator apparatus is activated during a non-typical operating state of the power generating system such that the condensate passes into the deaerator apparatus wherein contaminants can be removed from the condensate. The differential phase shift keying demodulator also includes a reference phasor computational module configured to generate said reference data basing on said past data representing the at least two past phasors.