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

CAV controllers Type RN-Ex 00131810_0
  • 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

Galvanised sheet steel construction

  • 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


Powder-coated construction (P1)

  • 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-coated


Stainless steel construction (A2)

  • Casing made of stainless steel 1.4301
  • Interior parts made of stainless steel


Variant with acoustic cladding (-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 A1, 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

Technical information

  • Function
  • Technical data
  • Quick sizing
  • Specification text
  • Order code
  • Produktbeziehungen
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 sizes80 – 400 mm
Volume flow rate range11 – 1400 l/s or 40 – 5040 m³/h
Volume flow rate control rangeApprox. 25 to 100 % of the nominal volume flow rate
Scale accuracy± 4 %
Minimum differential pressure50 Pa
Maximum differential pressure1000 Pa
Operating temperature10 – 50 °C


Quick sizing: Sound pressure level at differential pressure 150 Pa

Nominal sizeVVAir-regenerated noiseAir-regenerated noiseAir-regenerated noiseAir-regenerated noiseCase-radiated noiseCase-radiated noise
Nominal sizeVV
Nominal sizeVVLPALPA1LPA1LPA1LPA2LPA3
Nominal sizel/sm³/hdB(A)dB(A)dB(A)dB(A)dB(A)dB(A)
80 11 40 3724171522<15
80 20 72 3927191724<15
80 40 144 4734242231<15
80 45 162 4835252432<15
100 22 79 3724171522<15
100 40 144 4047222021<15
100 70 252 4747272629<15
100 90 324 5050302933<15
125 35 126 3727211815<15
125 60 216 4334272519<15
125 115 414 5041353327<15
125 140 504 5244393730<15
160 60 216 4032262429<15
160 105 378 4537322933<15
160 190 684 4941353339<15
160 240 864 504136344116
200 90 324 4031242228<15
200 160 576 4335282632<15
200 300 1080 484033324017
200 360 1296 494135334220
250 145 522 413224222915
250 255 918 4234282633<15
250 470 1692 463933314019
250 580 2088 484135344322
315 230 828 3933262330<15
315 400 1440 4235292735<15
315 750 2700 443832314019
315 920 3312 464135344323
400 350 1260 4639332945<15
400 610 2196 484236324918
400 1130 4068 504438355424
400 1400 5040 514540375627

① RN-Ex

② RN-Ex with secondary silencer CS/CF, insulation thickness 50 mm, length 500 mm

③ RN-Ex with secondary silencer CS/CF, insulation thickness 50 mm, length 1000 mm

④ RN-Ex with secondary silencer CS/CF, insulation thickness 50 mm, length 1500 mm

⑤ RN-Ex-D


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

Galvanised sheet steel construction

  • 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


Powder-coated construction (P1)

  • 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-coated


Stainless steel construction (A2)

  • Casing made of stainless steel 1.4301
  • Interior parts made of stainless steel


Variant with acoustic cladding (-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 A1, 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 to 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
  • Minimum differential pressure: 50 Pa
  • Maximum differential pressure: 1000 Pa

00107131_0.

 Type
RN-Ex       Volume flow controller for potentially explosive atmospheres

 Acoustic cladding
       No entry: none
D       With acoustic cladding

 

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

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

 Accessories
       No entry: none
D2       Lip seals on both ends

 

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For general question regarding products or services you can also call:
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