laminarflow

DESCRIPTION OF THE SYSTEM

Blower

Adsorption of the surrounding air from the front side:
For this situation of adsorption double-flow radial fans with coiled casings are used. The coiled casings are made of galvanized thin sheet in folded type with flanged outlet, integrated inlet nozzle and suspension of the motor. The sound conducted through solids is decoupled at the axle of the built-in motor. According to the size of the fan the impellers are made of galvanized thin sheet of rolled type respectively of welded type, plastic-coated. Balancing quality: G 6,3 ac. to DIN ISO 1940 part 1.

Adsorption of the surrounding air from above:
For this situation of adsorption ventilation modules are used. The ventilation module consists of a motor fan wheel (impeller made of Al Mg 3, riveted respectively welded) and an engine bedplate made of galvanized thin sheet. By streamlined-section struts made of continuous casting in aluminium these are screwed to a galvanized base plate made of thin sheet. The axle of the motor is vertical. The motor is connected to the engine bedplate by swinging bearing elements.

Prefilter

Adsorption of the surrounding air from the front side:
The filter medium made of synthetic fibre R50 Super consists of finest synthetic fibres. Special characteristics are a relatively low pressure difference, a high capacity of dust-loading as well as its flame-retardant quality. The filter class acc. to EN 779 corresponds to G 4. The filter medium is clamped between two aluminium grids which are welded to an aluminium frame profile. The frame is inserted into the suction port of the laminarflow housing.

Adsorption of the surrounding air from above:
A progressively composed fleece material made of synthetic-organic fibres is used as filter medium. The frame construction consists of rigid, moisture-repellent cardboard, glued dust-tight to the four interior sides of the frame with the folded filter medium. The frame is inserted into a perforated sheet steel screwed over the suction port of the fan on the roof. The filter class acc. to EN 779 corresponds to G 4.

Support
Types

Execution in wood:

Manufactured of sound- and vibration-repellent wooden chipboard E1, coated with melamin varnish on both sides. Lusterless surface, colour white RAL 7035/7037. Filter support frame made of chipboard glued several times, with abrasion-proof coating.

Execution in stainless steel:

Manufactured of stainless sheet steel 1.4301, brushed surface, inside completely encased with sound- and vibration-repellent insulating material, for max. level of acoustic power of 65 dB(A) of the fan. Welded housing and additionally sealed with low-fungicidal silicon.

Execution in sheet steel:

Manufactured of epoxy-coated sheet steel, colour RAL 7035, inside completely encased with sound- and vibration-repellent insulating material, for max. level of acoustic power of 65 dB(A) of the fan. Welded housing and additionally sealed with low-fungicidal silicon.

Design of housing
Adsorption of the surrounding air from the front side:

The housing is open towards the bottom. Integrated into the housing are two intermediate shelves to take up the filters resp. the fans. In the front side is the opening into which the prefilter is inserted. Behind the prefilter is the adsorption area with the fan.

Adsorption of the surrounding air from above:

The housing is open towards the bottom. Integrated into the housing is an intermediate shelf to take up the filters. The fan is screwed to the roof of the housing. The prefilter is above the opening in the roof.

High-efficiency mechanical filter

Used are micro-glass-fibre papers with special binding system. Each filter element is tested for leakage acc. to EN 1822. The filtration efficiency in the grade minimum (Most Penetrating Particle Size) acc. to EN 1822 is >=99,9995 %. The duration of the mechanical filters until they are contaminated depends on the grade of contamination of the surrounding air on the location of erection of the LF System plant. If “Filterwechsel” (change of filter) appears on the display, proceed as follows:

  • Switch off main switch
  • Change prefilter
  • Switch on main switch

If the signal “Filterwechsel" appears again, the mechanical filter is contaminated and must be changed as follows:

  • Switch off main switch
  • If installed, remove safety beam / laminarisator
  • Loosen tension elements of filter
  • Remove filter downwards

The installation of the new mechanical filter is made the other way round. Please take care that the arrow on the aluminium frame of the filter shows downwards in the flow-direction and that the foamed rubber sealing underneath the bottom of the filter sits close to the flow-box.

Control

Designed as complete slide-in unit. Operation and regulation are made by the foil-covered keyboard. The foil-covered keyboard includes keys to adjust the nominal value of the flow velocity. In the double-spaced display the velocity of clean air as well as the actual rate of input of the motor are displayed in %. The speed regulation of the blower motor is regulated automatically in dependence of the contamination of the filter and depends on the nominal value set at the time given for the velocity of the clean air. If the maximum motor output is reached and the preset velocity of clean air is no longer obtained, the display will show change of filter. Alternatively the regulation can be switched to static operation. Additional potential-free contact as signal for regulation or information.

Illumination

As standard tub-shaped lights in tear-drop-form, especially developed for clean areas, are installed. Depending on the size of the housing of the LF system-plant the lights are equipped with 18 Watt, 36 Watt or 58 Watt luminescent-screen tubes. The colour of the light is cold white, the illumination level is approx. 500 Lux in a distance of one meter.

Delimitation of the working area

In order to achieve a particle-free resp. a sterile zone under the LF system plant, the surrounding atmosphere must be delimited. Only in this way the achievement of clean conditions can be ensured.

PVC strip curtains:

These are fixed to the frame support all around below the laminarflow housing and define the working area. According to the desire of the customer, the curtains can be fixed with tape, alternatively on stainless steel rods or with hangers on a pipe. The pipe is screwed between the feet of the support. The PVC-curtain can also be in one piece, fixed to a rail system. Then the complete curtain can be pushed to the side. The PVC-curtain can be supplied in antistatic material. The conductive discharge of electricity is obtained by soaking in a special bath and therefore is only applied to one side of the surface of the PVC-curtain. It must be noted that, after approx. 2-3 years, due to mechanical abrasion the conductive discharge is no longer complete.

Acrylic glass panes:

The panes are either fixed by stainless steel angels that are screwed to the support or attached to a pipe by holding angles. The pipe is screwed between the feet of the support. As an alternative the panes can be supplied in antistatic type, the leakage resistance is 10-7-10-9 Ohm.

Guarantee and documentation

Prior to delivery, the impeccable functionality of each unit is tested in our factory and provided with the necessary relevant documentation. We guarantee the adherence to the required classes of purity acc. to "US Federal Standard 209 b", resp. to the classes acc. to VDI 2083 as well as a performance according to FDA resp. GMP.

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