Sinex Air Vibrators is essentially a Pneumatic Piston Oscillator. Piston is made to oscillate to & fro by a positive feed back signal. The oscillations thus generated impart vibration. 

 

Impact Vibrator has its piston malletting continuously at one end while it is cushioned at the other. Since impact has high energy release rate, it is very effective in dislodging stubborn material build ups. Impact produces considerable noise, but the vibrator is run in short bursts and used for remote & open air installations. This type is ideal at places where traditionally bars and mallets have been used.