00131810_0
CAV controllers Type RN-Ex


00131810_0
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00135111_0
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RN-EX    

For the precise control of constant volume flows in potentially explosive atmospheres (ATEX)

Circular, mechanical self-powered volume flow controllers for the control of supply air or extract air in constant air volume systems, 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
  • Volume flow rate can be set using an external scale, no tools required
  • No on-site test measurements required for commissioning
  • Suitable for airflow velocities of up to 12 m/s
  • Any installation orientation
  • Casing air leakage to EN 1751, class C


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

    Application

    • Circular EXCONTROL CAV controllers of Type RN-Ex for the precise supply air or extract air flow control in constant air volume 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
    • The volume flow rate can be set using an external scale; no tools required
    High volume flow rate control accuracy

    Useful additions

    • Circular silencers CA (for Germany and Switzerland) and CAH (for EMEA)
    Pipe silencer to be ordered separately

    Construction features

    • Circular casing
    • Construction and materials comply with the EU directive for use in potentially explosive atmospheres (ATEX)
    • Spigot suitable for circular ducts to EN 1506 or EN 13180
    Spigot with insert bead for lip seal; (except RN-Ex-P1/80 not possible with insert bead/lip seal)

    Materials and surfaces

    Galvanised sheet steel construction
    • Any installation orientation
    Correct operation even under unfavourable upstream or downstream conditions (1.5 D straight section required upstream)

    Classification

    According to type examination certificate TÜV 05 ATEX 7159 X
    • Casing made of galvanised sheet steel
    • Interior parts, nominal sizes 80 – 125: stainless steel 1.4301, nominal sizes 160 – 400: galvanised sheet steel
    • Polyurethane bellows
    • Plain bearings with PTFE coating
    • Leaf spring made of stainless steel
    • Zone 1 and 2 (substance group gases): II 2 G c II T5 / T6Powder-coated (P1)
    Zone 21 and 22 (substance group dusts): II 2 D c II T 80 °C

    Nominal sizes

    80, 100, 125, 160, 200, 250, 315, 400

    Variants

    • RN-Ex: ATEX volume flow controller in standard construction
    • Casing made of galvanised sheet steel, powder-coated
    • Interior parts, nominal sizes 80 – 125: stainless steel 1.4301, nominal sizes 160 – 400: galvanised sheet steel, powder- coatedStainless steel construction (A2)
    • Casing made of stainless steel 1.4301
    • Interior parts made of stainless steelFor demanding acoustic requirementsVariant with acoustic cladding (-D)
    • RN-Ex-D: ATEX volume flow controller with acoustic cladding
    Acoustic cladding cannot be retrofitted

    Construction

    • Galvanised sheet steel
    • Acoustic cladding made of galvanised sheet steel
    • Rubber seal for the insulation of structure-borne noise
    • Lining made of mineral wool Mineral wool
    • P1: Powder-coated surface, silver (RAL 7001)
    A2: Stainless steel

    Parts and characteristics

    • Ready-to-commission controller
    • Damper blade with low-friction bearings
    • Bellows for vibration damping
    • Cam plate with leaf spring
    • Scale with pointer to set the volume flow rate setpoint
    • Terminal point for equipotential bonding
    • Enclosed ground cable (approx. 1 m length)
    • Aerodynamic functional testing of each unit on a special test rig before shipping
    • Acc. to EN 13501, fire rating class A1, non-combustible
    • RAL quality mark RAL-GZ 388
    Harmless to health due to high biosolubility, according to TRGS 905 as well as EU Directive 97/69/EC

    Standards and guidelines

    • Directive 94/9/EC: Equipment and protective systems intended for use in potentially explosive atmospheres
    • Meets the hygiene requirements of VDI 6022
    Casing air leakage acc. to EN 1751, class C

    Maintenance

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

    Accessories

    • Lip seals on both ends (factory fitted)

    Technical information

    • FUNCTION 
    • TECHNICAL DATA
    • SPECIFICATION TEXT
    • ‌ORDER CODE
    Schematic illustration of the RN-Ex 00131410_0
    ① Damper blade
    ② Bellows
    ③ Bellows inlet
    ④ Crossbar
    ⑤ Leaf spring
    ⑥ Cam plate
    ⑦ Volume flow rate scale lock
    ⑧ Volume flow rate scale
    ⑨ Lip seal


    Functional description

    The volume flow controller is a mechanical self-powered unit and works without external power supply. A damper blade with low- friction bearings is adjusted by aerodynamic forces such that the set volume flow rate is maintained within the differential pressure range.

    The aerodynamic forces of the airflow create a closing torque on the damper blade. The bellows extends and increases this force while at the same time acting as an oscillation damper. The closing force is countered by a leaf spring that unrolls over a cam plate. The shape of the cam plate is such that a change in the differential pressure leads to an adjustment of the damper blade in a way that the volume flow rate is maintained almost exactly.

    Efficient commissioning

    The volume flow rate setpoint value can be set quickly and easily using the pointer on the external scale; no measurements are required.

    The advantage over flow adjustment dampers is that there is no need for repeat measurements or adjustments by an air conditioning engineer. 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 volume flow controllers A mechanical self-powered controller reacts immediately and adjusts the damper blade such that the set constant volume flow rate is maintained.

    Downloads

    product information

    • Product Data Sheet Retrofit Kits

      Retrofit+kits_PD_2020_02_11_DE_en Product Data Sheet 590 KB pdf

    • Product data sheet Type RN-Ex

      RN-Ex_PD_2023_08_23_DE_en Product data sheet 620 KB pdf

    certificates

    • Certificate concerning statistical leakage tests

      LC_v1_2024_10_DE_en Certificate  660 KB pdf

    • Declaration of hygiene conformity Type RN-Ex

      RN-Ex_HC_2024_05_DE_en Hygiene certificate 2,1 MB pdf

    • EC Declaration of conformity RN-Ex

      RN-EX_CE_2017_06_DE_de_en_fr EC Declaration of conformity 83 KB pdf

    operation manuals

    • Installation manual RN-Ex

      IM_2017_08_A00000063846_RN-Ex_V1_GB_en Installation manual 1,6 MB pdf

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