The monitor device is for an electrical machine, and enables the coolant flow to be determined. A test probe (2) is provided in each parallel cooling circuit. It contains a resistance thermometer (3) in thermal contact with an electric heater (4). Devices are provided in the heater supply circuit, through which a constant electric power is applied to the heater (4). A resistance thermometer (3) is connected to an evaluator (10) which cyclically interrogates the probes and compares their reading with each other. In case of deviations a signal is delivered by a signalling device (12).
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