Pneumatic Vibrators

Pneumatic concrete vibrator — how compressed-air drive works

A pneumatic vibrator (air-driven poker) compacts fresh concrete without any electricity. Compressed air travels from the compressor through a hose straight into the poker head, where it spins a vane turbine coupled to an eccentric weight — and that eccentric produces the vibration transferred into the concrete. In a conventional electric vibrator the motor sits outside the head and drives it through a flexible shaft; in a pneumatic unit the entire drive is housed inside the poker itself, and the only thing running between compressor and vibrator is an air hose. That makes the tool simpler to operate, with no flexible shaft to wear out or kink when the hose is routed badly.

The NORWIT.PL range covers pneumatic vibrators primarily from Enar, Altrad Belle and Husqvarna Construction — for example the Enar PNU 100 pneumatic vibrator. Equipment from these manufacturers is available on the Enar brand page. Below we explain which compressor will feed the poker, where air drive performs best and how it compares with an electric vibrator.

Concrete vibrator drive types — pneumatic, electric, low-voltage

Choosing a concrete vibrator comes down to drive type first, rather than raw power or head diameter. A full overview of every type is available in the concrete vibrators category — the table below places the pneumatic segment against the other drives in the range.

Which compressor feeds a pneumatic vibrator — pressure and air consumption

Without the right pressure and air flow, the turbine inside the poker never reaches its rated vibration frequency. Typical pneumatic concrete pokers run at a working pressure of around 6-7 bar and draw anywhere from a few hundred up to roughly 2000 l/min of compressed air depending on head diameter, so feeding one calls for a correctly sized screw or piston compressor rather than a small workshop unit.

It pays to fit a filter, pressure regulator and lubricator assembly (an FRL unit) into the air line — it strips moisture and contaminants out of the system and lubricates the turbine vanes, which limits their wear during daily, multi-hour operation.

Where pneumatic vibrators are used — industries and working conditions

Pneumatic vibrators dominate wherever electric drive is unwanted or forbidden. In precast concrete plants air pokers run almost continuously through the whole shift, because a central compressor room is already on site feeding other machines in the hall. In mining and tunnelling, air drive removes any sparking risk around methane and coal dust, while in hydraulic engineering (dams, locks, quay structures) it allows concrete to be compacted in direct contact with water with no shock hazard. The same applies in refineries, petrochemical plants and other explosive atmospheres (ATEX), where a pneumatic vibrator is often the only drive type permitted for concreting work.

On a typical residential or commercial site with 230 V mains available, electric or 42 V low-voltage vibrators are the more common choice — they are quicker to get running, since no separate compressor installation is required.

Pneumatic vs electric vibrator — differences and running costs

Both types compact concrete equally well; what separates them is the power source and the cost of running it. A 230 V electric vibrator is usually cheaper day to day, because mains electricity delivers useful power more efficiently than compressed air — producing comparable useful output in a compressor can consume several times more energy than direct electric drive, mostly through heat losses while compressing to 6-7 bar. The pneumatic unit wins wherever safety governs: it needs no earthing and no 30 mA residual current device (RCD, a device that cuts the supply when it detects leakage current) mandatory for power tools on wet sites, and it can be used without restriction in water and in Ex zones.

Frequently asked questions about pneumatic concrete vibrators

Why buy a pneumatic vibrator from NORWIT.PL

Our pneumatic vibrators come primarily from Enar, Altrad Belle and Husqvarna Construction — equipment proven in precast concrete production, mining, hydraulic engineering and explosive atmospheres. We advise on matching compressor and poker diameter to your specific working conditions, and a full overview of electric and low-voltage drives is available in the concrete vibrators category. Orders are placed online, with delivery nationwide.