Nederman FlexPAK 800 DX Manuel D'instruction page 19

3 Description
3.1 Function
FlexPAK 800/1000 DX is a complete vacuum unit with a direct driven side channel fan
fitted as one unit on a steel frame and a start and control unit with an integrated 24 V
transformer. The unit is controlled by a frequency converter, has automatic start/stop, and
automatic filter cleaning.
Filtration in two stages
FlexPAK 800/1000 DX filters particles in two stages. In the first stage, coarse particles are
separated away in the inlet. In the second stage, fine particles are separated away by filter
bags, see figure 9.
Automatic filter cleaning
FlexPAK 800/1000 DX uses filter cleaning by a short blast of reversed air flow with
atmospheric pressure. By the rapid opening of the Filter Cleaning Valve (FCV) located on
top of the filter, a powerful blast of reversed air flow is created, efficiently dislodging dust
from the filter bags, see figure 8.
Control filter
The unit is equipped with a control filter, see figure 4B, item 16. The control filter filters the
air after the main filter to ensure that no material continues to the suction source in case of
a main filter breakage. The control filter functions as a safety device and does not increase
the filtration efficiency.
The pressure drop over the control filter is monitored, and a signal is sent to the control
unit if the pressure difference reaches the set value. The pressure difference is preset at 4
kPa /40 mbar / 0.58 PSI.
3.2 FlexPAK 800/1000 DX and ATEX
3.2.1 Area classification
FlexPAK DX is designed to extract combustible and non-combustible dust, but the unit "as
a whole" is not to be placed in an area that is classified as a zone according to directive
1999/92/EC. It is only the inside of the filter that meets ATEX requirements.
FlexPAK DX may be used with duct systems internally classified as zone 20, 21 or 22.
The product has no
to be considered a simple filter/silo and does not fall under the scope of the directive
2014/34/EU.*
*Source: ATEX working group considerations; "How should the directive be applied to filter
units and vented silo bins."
3.2.2 Permitted materials
WARNING! Explosion risk.
• Do not collect material that may cause ignition or blocking. It is strictly prohibited to
collect material that may undergo dangerous chemical or thermal reactions and/or self-
ignite.
• Do not make any changes to this product without consulting Nederman. Adding a
relief duct or changing the spacing or length of filter elements affects the calculations
according to EN 14491.
• The filter should not be used for filtering fumes from welding processes.
WARNING! Risk of personal injury.
Use suitable protective equipment: goggles, ear protection and a protective mask.
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marking since there is no internal ignition source. The inside is
FlexPAK 800/1000 DX EN
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