Several calorimetric measurements on electrolysis processes for monitoring the ‘‘cold fusion’’ event are represented in this work. A Calvet microcalorimeter with its auxiliaries such as amplifier, recorder, computer etc. was used here for measuring the output power generated during these processes. And at the same time, the total electric input power was recorded for comparing with differences between the out power (or the power measured by the calorimeter) and the electric power minus the equivalent of the D2O (or H2O) formation enthalpy (1.54 (voltage) x I (current)) continuously. After a period of cell operation, over about two weeks, a steady production of ‘‘Excess Heat’’ could be demonstrated on the recordings. In particular, there are sporadic power ‘‘excursions’’ or ‘‘burst’’ monitored in uncertain time. There results could not incontestably show that the cold fusion event has been monitored. Because, at the same time, the neutrons, tritiums, and other particles produced during the processes had not been found out by some types of films being able to detect different kinds of particles yet.