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EN-Ex
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Visual display of the damper blade position

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Large dimensions as double version

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Conforms to VDI 6022

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EN-EX   

FOR PRECISE CONTROL OF NORMAL TO HIGH CONSTANT VOLUME FLOWS IN POTENTIALLY EXPLOSIVE ATMOSPHERES ACCORDING TO ATEX


Rectangular, mechanically self-powered air terminal units for supply and extract air
systems with constant air volume flows, approved and certified for potentially
explosive atmospheres (ATEX)

  • ATEX-compliant construction
  • Approved for gases, mists, vapours and dusts in zones 1, 2, 21 and 22
  • Suitable for volume flow rates up to 12600 m³/h or 3500 l/s
  • Volume flow rate adjustment from outside by rotary knob
  • High control accuracy
  • No on-site test measurements required for commissioning
  • Casing air leakage to EN 1751, class C
  • Visual display of the damper blade position for operating point optimisation


Optional equipment and accessories
  • Acoustic cladding for the reduction of case-radiated noise
  • Secondary silencer Type TX for the reduction of air-regenerated noise

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    General information

    Application

    • Rectangular EXCONTROL-KVS control units for supply or extract air volume flow control in constant volume flow systems
    • For use in potentially explosive atmospheres (ATEX)
    • Mechanical self-powered volume flow control without external power supply
    • Simplified project handling by ordering based on nominal size


    Special characteristics

    • ATEX mark and certification
    • ATEX equipment-group II, approved for zones 1, 2, 21 and 22
    • Setting of the volume flow setpoint from the outside by rotary knob
    • High control accuracy of the set volume flow rate
    • Correct operation even under unfavourable upstream conditions
    • Visual display of the damper blade position for operating point optimisation


    Nominal sizes

    • 19 nominal sizes from 200 × 100 – 600 × 600 mm


    Variants

    • EN-Ex: Air terminal units
    • EN-EX-D: Air terminal units with acoustic cladding
    • Units with acoustic cladding and/or secondary silencer Type TX for demanding acoustic requirements


    Construction

    • Galvanised sheet steel
    • P1: Powder-coated, silver grey (RAL 7001)
    • Parts and characteristics
    • Air terminal unit ready for commissioning
    • Damper blade with low-friction bearings
    • Bellows for vibration damping
    • Cam plate with leaf spring
    • Rotary knob pointer and scale for adjusting the flow rate setpoint
    • Each air terminal unit is tested in the factory on a special ventilation test rig
    • Visual display of the damper blade position for operating point optimisation
    • Terminal point for equipotential bonding
    • Enclosed ground cable (approx. 1 m length)


    Classification

    • Zones 1 and 2 (atmosphere: gases): II 2G Ex h IIC T6 Gb
    • Zones 21 and 22 (atmosphere: dusts): II 2D Ex h IIIC T80°C Db


    Useful additions

    • Secondary silencer Type TX


    Construction features

    • Rectangular casing
    • Construction and materials comply with the EU directive for use in potentially explosive atmospheres (ATEX)
    • Flanges on both ends, suitable for duct connections
    • Air terminal units from H = 400 mm as double version (2 dampers with separate setting scales)


    Material and surfaces

    Galvanised sheet steel construction

    • Casing and damper blade made of galvanised sheet steel
    • Leaf spring made of stainless steel
    • Polyurethane bellows
    • Plain bearings with PTFE coating
    • Cam plate and adjusting unit made of galvanised sheet steel

    Powder-coated construction (P1)

    • Casing and damper blade made of galvanised sheet steel, powder-coated
    • Leaf spring made of stainless steel
    • Polyurethane bellows
    • Plain bearings with PTFE coating
    • Cam plate and adjusting unit made of galvanised sheet steel

    Variant with acoustic cladding (-D)

    • Acoustic cladding made of galvanised sheet steel
    • Rubber seal for the insulation of structure-borne noise
    • Lining made of mineral wool

    Mineral wool

    • Acc. to EN 13501, fire rating class A1, non-combustible
    • RAL quality mark RAL-GZ 388
    • Non-hazardous thanks to high biosolubility according to the German Ordinance on Hazardous Substances and Note Q of the European Regulation (EC) No. 1272/2008


    Standards and guidelines

    Meets the hygiene requirements of

    • EN 16798, Part 3
    • VDI 6022, Sheet 1
    • DIN 1946, Part 4
    • For further standards and guidelines, please refer to the hygiene certificate

    Casing air leakage

    • EN 1751, Class C

    ATEX Directive 2014/34/EU

    • Equipment and protective systems intended for use in potentially explosive atmospheres

    Maintenance

    • Maintenance-free, as construction and materials are not subject to wear and tear

    Technical information

    • FUNCTION
    • TECHNICAL DATA
    • SPECIFICATION TEXT
    • ORDER CODE
    Schematic illustration of the EN-Ex EN-Ex_gc_01.ai.png

    ① Damper blade
    ② Bellows
    ③ Bellows inlet
    ④ Scale sticker
    ⑤ Connection for equipotential bonding
    ⑥ Visual display of the damper blade position
    ⑦ Rotary knob

    Functional description

    The air terminal unit is a mechanical self-powered unit and works without external power supply. A damper blade with low-friction bearings is adjusted by aerodynamic forces so that the set volume flow rate is kept constant within the differential pressure range. The aerodynamic forces of the airflow create a closing torque on the damper blade. An inflating bellows amplifies this force and at the same time acts as a damping element. The closing torque is countered by a leaf spring that unrolls over a cam plate. The cam plate is adapted in such a way that the damper blade moves when the differential pressure changes. As a result, the volume flow rate remains constant within narrow tolerances.

    Efficient commissioning

    Using the rotary knob, the desired volume flow setpoint can be set quickly on the external scale, no prior measurement required. The advantage over conventional flow adjustment dampers is that no repeated measurements or adjustments during commissioning are required. Should the system pressure change, e.g. by opening or closing of duct sections, the flow rates in the entire system will also change if flow adjustment dampers are used; however, this is not the case with mechanical self-powered air terminal units. The air terminal unit reacts immediately and keeps the set air volume constant.

    Air terminal units in rectangular design for constant air volume systems, mechanically self-powered, without external power supply, for supply or extract air, in 19 nominal sizes. Air terminal unit ready for commissioning, consisting of the casing with smooth-running control damper, control bellows and external cam disc with leaf spring as well as components for equipotential bonding and explosion protection. The air terminal units are factory adjusted and preset to a reference air volume. Sound power level measured according to DIN EN ISO 5135. Meets the hygiene requirements according to VDI 6022. Meets the requirements of ATEX Directive 2014/34 EU.

    Special features

    • ATEX mark and certification
    • ATEX equipment-group II, approved for zones 1, 2, 21 and 22
    • Setting of the volume flow setpoint from the outside by rotary knob
    • High control accuracy of the set volume flow rate
    • Correct operation even under unfavourable upstream conditions
    • Visual display of the damper blade position for operating point optimisation


    Materials and surfaces

    Galvanised sheet steel construction

    • Casing and damper blade made of galvanised sheet steel
    • Leaf spring made of stainless steel
    • Polyurethane bellows
    • Plain bearings with PTFE coating
    • Cam plate and adjusting unit made of galvanised sheet steel

    Powder-coated construction (P1)

    • Casing and damper blade made of galvanised sheet steel,
    • powder-coated
    • Leaf spring made of stainless steel
    • Polyurethane bellows
    • Plain bearings with PTFE coating
    • Cam plate and adjusting unit made of galvanised sheet steel

    Variant with acoustic cladding (-D)

    • Acoustic cladding made of galvanised sheet steel
    • Rubber seal for the insulation of structure-borne noise
    • Lining made of mineral wool

    Mineral wool

    • Acc. to EN 13501, fire rating class A1, non-combustible
    • RAL quality mark RAL-GZ 388
    • Non-hazardous thanks to high biosolubility according to the German Ordinance on Hazardous Substances and Note Q of the European Regulation (EC) No. 1272/2008


    Construction

    • Galvanised sheet steel
    • P1: Powder-coated, silver grey (RAL 7001)


    Technical data

    • Nominal sizes: 200 × 100 to 600 × 600 mm
    • Volume flow rate range: 39 – 3500 l/s or 140 – 12600 m³/h
    • Volume flow rate control range: approx. 25 – 100 % of the nominal volume flow rate
    • Minimum differential pressure: 50 Pa
    • Maximum permissible differential pressure: 1000 Pa
    • Casing air leakage acc. to EN 1751, class C


    Sizing data

    • qᵥ [m³/h]
    • Δpst [Pa]

    Air-regenerated noise

    • LPA [dB(A)]

    Case-radiated noise

    • LPA [dB(A)]

    EN-Ex–D–P1/400 × 200
    ||||
    1234
    1 Type
    EN-Ex Air terminal unit 2 Acoustic cladding
    No entry: without acoustic cladding
    D with acoustic cladding

    3 Material
    No entry: galvanised sheet steel
    P1 Powder-coated RAL 7001 (silver grey)

    4 Nominal size [mm]
    Specify width × height


    Order example: EN-Ex-D-P1/400×200

    TypeEN-Ex
    Acoustic claddingwith acoustic cladding
    MaterialPowder-coated RAL 7001 (silver grey)
    Nominal size [mm]Width 400, height 200

    Downloads

    product information

    • Product data sheet Type EN-Ex

      EN-Ex_PD_2024_04_25_DE_en Product data sheet 680 KB pdf

    certificates

    • Certificate concerning statistical leakage tests

      LC_v1_2024_10_DE_en Certificate  660 KB pdf

    • Declaration of hygiene conformity Type EN-Ex

      EN-Ex_HC_2024_05_DE_en Hygiene certificate 1,5 MB pdf

    • EC Declaration of conformity EN-Ex

      CE_2019_04_EN-Ex_DE_de_en_fr EC Declaration of conformity 160 KB pdf

    operation manuals

    • Installation manual EN-Ex

      EN-Ex_IM_A00000074507_V5_2023_05_GB_en Installation manual 820 KB pdf

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