RN-Ex

CAV controllers Type RN-Ex

Tested to VDI 6022

ATEX-Zertifizierung

Adjustment scale

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

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)

Teknisk informasjon

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.

Nominal sizes	80 – 400 mm
Volume flow rate range	11 – 1400 l/s or 40 – 5040 m³/h
Volume flow rate control range	Approx. 25 – 100% of the nominal volume flow rate
Scale accuracy	± 4 %
Minimum differential pressure	50 Pa (nominal size 80: 100 Pa)
Maximum differential pressure	1000 Pa
Operating temperature	10 – 50 °C

1 Type
RN-Ex Volume flow controller for potentially explosive atmospheres

2 Acoustic cladding
No entry: none
D with acoustic cladding

3 Material
No entry: galvanised sheet steel
P1 Powder-coated RAL 7001 (silver grey)
A2 Stainless steel construction

4 Nominal size [mm]
80, 100, 125, 160, 200, 250, 315, 400

5 Accessories
No entry: without accessories
D2 Double lip seal both ends

Nedlastinger

Produkt informasjon

Product data sheet Type RN-Ex

RN-Ex_PD_2026_06_22_DE_en Product data sheet 441,05 kB pdf

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