Type 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
small_tab1_Serie RN-Ex
  • Application
  • Description

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 with orders based on nominal size

Special features

  • ATEX mark and certification
  • ATEX equipment group II, approved for zones 1, 2, 21 and 22
  • Volume flow rate can be set using an external scale; no tools required
  • High volume flow rate control accuracy
  • Any installation orientation
  • Correct operation even under unfavourable upstream or downstream conditions (1.5 D straight section required upstream)

Variants

  • RN-Ex: Volume flow controller
  • RN-Ex-D: Volume flow controller with acoustic cladding
  • Units with acoustic cladding and/or Type CA secondary silencers for demanding acoustic requirements
  • Acoustic cladding cannot be retrofitted

Construction

  • Galvanised sheet steel
  • P1: Powder-coated, silver grey (RAL 7001)
  • A2: Stainless steel

Parts and characteristics

  • Ready-to-commission controller
  • Damper blade with low-friction bearings
  • Bellows that acts as an oscillation damper
  • Cam plate with leaf spring
  • Scale with pointer to set the volume flow rate setpoint
  • Connection for equipotential bonding
  • Aerodynamic function testing of each unit on a special test rig prior to shipping

Accessories

  • Lip seals on both ends (factory fitted)

Useful additions

  • Secondary silencer Type CA

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 groove for lip seal (RN-P1/80 without groove)

Materials and surfaces

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


 

RN-Ex-D:

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


 

Mineral wool

  • To EN 13501, fire rating class A2, non-combustible
  • RAL quality mark RAL-GZ 388
  • Biosoluble and hence hygienically safe according to the German TRGS 905 (Technical Rules for Hazardous Substances) and EU directive 97/69/EG

Información técnica

  • Function
  • Technik
  • Quick sizing
  • Specification text
  • Order code
  • Produktbeziehungen
rn_ex

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.

rn_ex
rn_ex

 

Circular volume flow controllers for constant air volume systems in potentially explosive atmospheres, mechanical self-powered, without external power supply, suitable for supply or extract air, available in 8 nominal sizes.

Ready-to-commission unit consists of the casing containing a damper blade with low-friction bearings, bellows, external cam plate with leaf spring, and parts for equipotential bonding and for protection in potentially explosive atmospheres.

Volume flow controllers are factory set to a reference volume flow rate (customers can set the required volume flow rate on site).

Spigot with groove for lip seal, suitable for connecting ducts according to EN 1506 or EN 13180.

Casing air leakage to EN 1751, class C.

Special features

  • ATEX mark and certification
  • ATEX equipment group II, approved for zones 1, 2, 21 and 22
  • Volume flow rate can be set using an external scale; no tools required
  • High volume flow rate control accuracy
  • Any installation orientation
  • Correct operation even under unfavourable upstream or downstream conditions (1.5 D straight section required upstream)

Materials and surfaces

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


 

RN-Ex-D:

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


 

Mineral wool

  • To EN 13501, fire rating class A2, non-combustible
  • RAL quality mark RAL-GZ 388
  • Biosoluble and hence hygienically safe according to the German TRGS 905 (Technical Rules for Hazardous Substances) and EU directive 97/69/EG

Construction

  • Galvanised sheet steel
  • P1: Powder-coated, silver grey (RAL 7001)
  • A2: Stainless steel

Technical data

  • Nominal sizes: 80 – 400 mm
  • Volume flow rate range: 11 to 1400 l/s or 40 to 5040 m³/h
  • Volume flow rate control range: approx. 25 – 100 % of the nominal volume flow rate
  • Differential pressure: 50 – 1000 Pa
rn_ex

Compartir

Recomendar

Recomendar el contenido de esta página, mandar por mail.

Los campos marcados con un (*) sin imprescindibles de cumplimentar

Compartir

Gracias por su recomendación!

Su recomendación ha sido enviada y llegará a su destino en breve.


Contacto

Estamos aquí para atenderles

Visual contact Visual contact

Por favor mande su solicitud
Tel.: +34 976 50 02 50 | Fax: +34 976 50 09 04

Los campos marcados con un (*) sin imprescindibles de cumplimentar

Contacto

Gracias por su mensaje.

Visual contact Visual contact

Su mensaje ha sido enviado correctamente, en breve será atendido.
En seguida nos pondremos en contacto con Vd.
Para información general sobre productos o servicios, por favor llamar al:
Tel.: +34 976 50 02 50 | Fax: +34 976 50 09 04

Contacto

Estamos aquí para atenderles

Visual contact Visual contact

Por favor mande su solicitud
Tel.: +34 976 50 02 50 | Fax: +34 976 50 09 04

Archivo adjunto (Max. 10MB)

Los campos marcados con un (*) sin imprescindibles de cumplimentar

Contacto

Gracias por su mensaje.

Visual contact Visual contact

Su mensaje ha sido enviado correctamente, en breve será atendido.
En seguida nos pondremos en contacto con Vd.
Para información general sobre productos o servicios, por favor llamar al:
Tel.: +34 976 50 02 50 | Fax: +34 976 50 09 04