Abstract: A slug detection and prevention apparatus 10 and method therefor, which includes a detector 1, high pass filter 2, low pass filter 3, half-wave rectifier 4, comparator 5, and relay 6. Detector 1, being an accelerometer, condenser microphone, or the like, is electrically connected to high pass filter 2. High pass filter 2 is electrically connected to a low pass filter 3 whose output is electrically connected to a half-wave rectifier 4. The output of half-wave rectifier 4 is electrically connected to a comparator 5 which is also electrically connected to a separate voltage source, the magnitude of which corresponds to the energy present in the pass band or a normally operating compressor. The output of comparator 5 is electrically connected to relay 6 which controls the operation of compressor 7. The vibration wave form of compressor 7 is monitored by detector 1 whose signal is filtered to produce an output between apparoximately 80 and 305 hertz.