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AL-KO Power Unit 250 BP Dust Extractor

The POWER UNIT 250 BP is an approved clean-air dust extractor in a self-supporting sheet metal construction made from coloured powder sheet steel. It is suitable for use in workshops with utilization factor of 2 - 4 machines (dependent on the required volume-flow). The small external dimensions also allow it to be installed in confined workshops.


AL-KO Power Unit 250 BP Dust Extractor

The POWER UNIT 250 BP is an approved clean-air dust extractor in a self-supporting sheet metal construction made from coloured powdered sheet steel. The device conforms to the most recent regulations, is certified with the BG-GS test seal, in accordance with GS-HO-07 (with endorsement for residual dust concentration test seal H3) and, thus, it can be directly installed in the workroom without additional fire or explosion protection measures. Therefore, it provides an ideal production condition with healthy air at the workplace.

It is also suitable for use in workshops with utilization factor of 2 – 4 machines (dependent on the required volume-flow), as well as to supplement a stationary plant as local extraction for universal application with different materials. The small external dimensions also allow the dust extractor to be installed in confined workshops.

The integrated pre-separator protects the filter bags from direct impact and achieves a high degree of pre-separation through decompression of the airflow. Thus, the greatly reduced impact on the filter significantly increases the endurance and service life of the filter bags. The available bypass apertures are to generate additional circulation of air, in order to prevent blinding the filter against the filter retaining plate.

A permanently driven agitator transports the extracted materials to a worm conveyor, which transfers the consolidated goods to the pressing chamber. A vertically arranged hydraulic cylinder provides precompaction. The actual pressing procedure is carried out by the horizontal main cylinder, which forces the material against the pressing jaws. When the consolidated goods are sufficiently compressed, the jaws open and the compacted waste is ejected. The pressing procedure is automatically started when the max. fill level is attained. By using the chrome-plated jaws and hardened bushing inserts in the pressing chamber, a long service life is guaranteed.

The fan, on the clean-air side, is in a flow-optimized housing. The well conceived design of the aluminium impeller with rearward facing curved vanes attains the highest operational effects. As necessary, using the convenient CEE plug with phase changing switch, the direction of rotation can be changed with one movement of the hand. The motor is in the return airflow and cased in a soundproofed cover.

Besides manual switching on, the PLC controller, installed in the device housing, also has an option for connection to automatic ON/OFF – switching, using a potential-free contact of a machine. Cleaning of the filter is carried out automatically after the fan is switched off. During extraction, cleaning is started if the maximum permitted filter differential pressure is exceeded. It is possible to manually start this procedure at any time using a switch on the device. In addition, a further control option can also be used here. When using the machine recognition with slide-valve control (accessory), activation can be carried out via a Potential-Free Contact (PFC) or transducer coils. The switching on threshold for the transducer coil and lag time is adjustable for each machine. The machine recognition with slide-valve control has a so-called bypass control, which also automatically opens one or more valves if the minimum volume-flow is not attained. It is possible to activate electropneumatic or electromotive valves using 24v control voltage.

With the integrated extinguishing facility, with liquid tank, the dust extractor is not dependent on a water supply. Activation of an extinguishing procedure is automatic, controlled by a temperature sensor. However, it can also be manually activated using the push button on the operating panel of the device control, adjacent to the indicator light.

The bag filters used, with internal metal spiral support, have a calendered, surface-treated filter material which is electroconductive, has the IBA certificate and conforms to Category M. Furthermore, the filter can be washed up to 3 times, which greatly increased the service life. The external application selected prevents congestion in the inside of the filter. The easily removed cover permits good access to the whole filter on the clean-air side for maintenance tasks.

For regeneration of the filter the proven AL-KO Opti JET procedure is used that ensures low contents of residual dust, as in stationary plant engineering. The compressed air required is store din its own internal compressed air tank, specially adapted and authorized. Cleaning is carried out using compressed-air impact pulses that clean the filter internally and externally (opposite to the filter impact direct) If there is heavier contamination, the resulting mechanical deformation of the filter generated optimizes the degree of regeneration.

Ex-factory pre-assembled


  • External switching cabinet

  • Machine recognition with slide-valve control 24V up to 4 machines

  • Transducer coil

  • Frequency inverter with pressure control

  • Space increase for expansion

  • PUR – Spiral hose

Accessories Briquette press

  • Oil cooler necessary if operated continuously for more than 6 – 8 hours

  • Oil preheating necessary if the ambient temperature is very low

  • Central lubrication system if operated continuously or no monitoring of the lubrication cycles

  • Oil deficiency switch switches off the device if the oil level decreases

  • BO-Transportation tube

Technical data

  • Intake connection 250mm

  • Motor rating 6,5 kW; 400 V/50 Hz

  • Max. volume-flow 4900m³/h

  • Rated volume-flow at the connection at 20 m/s 3534m³/h

  • Vacuum at the connection at 20 m/s 2740 Pa

  • Filter area 22,4m²

  • Filter material Cat. M, el, white washable (63 pieces)

  • Impact on filter 157m³/m²/h

  • Max. noise level 74 dB(A)

  • Residual dust content H3 / <0, 1 mg/m3

  • Basic control Micro SPS-Logo Siemens

  • Electrical Connections 5m connection cable with CEE Plug

  • 5 poles, 32 A, with phase inverter

  • Compressed air supply ½” standard plug

  • Dimensions (LxWxH) 2318 x 1314 x 2797

  • Weight     Kg

  • Design/Control Side choice right / left

Technical data Briquette press

  • Briquette diameter 50mm

  • Performance ca. 30 – 40kg/h

  • Connected load  5,5kW

  • Dimensions 1774 x 1302 x 1055

  • Hydraulics 100 L Oil tank

  • Weight     Kg

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