Abstract: The invention concerns a method of monitoring, setting and regulating the filling level of a refrigerant evaporator using a throttle valve and a measuring apparatus mounted in the intake line, the measuring signal determined being freed from interfering portions and a useful measured value thus being generated. By using the useful measured value of a flowmeter, the fluctuations in the flow of refrigerant in the intake line are examined with respect to random short-time fluctuations from which a degree of fluctuation is derived. The degree of fluctuation is a measure of the value of the random short-time fluctuations which is simultaneously used for regulation purposes and is compared with a specified value in order to evaluate the quality of the evaporator filling.

Abstract: In a process for setting, controlling and monitoring the level in a refrigerant evaporator (3) inserted in a closed circuit of a refrigerating machine (1) and evaporating a mass flow of refrigerant (4) into a substantially dry power gas, a heatable measuring body (11) is built into the power gas line (71) arranged downstream of the refrigerant evaporator (3). The measuring body (11) is surrounded by the flow of power gas. It is heated to a temperature surpassing the temperature of the power gas. The impact of the fluid refrigerant drops on the measuring body (11) is determined by measuring the energy required for the evaporation of the fluid drops.