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กรกฎาคม 6, 2022

TVR-Ex

FOR THE CONTROL OF VARIABLE AIR VOLUME FLOWS IN POTENTIALLY EXPLOSIVE ATMOSPHERES (ATEX)

Circular VAV terminal units for variable air volume systems, approved and certified for potentially explosive atmospheres (ATEX)

  • ATEX-compliant construction and parts
  • Approved for all gases, mists and vapours in zones 1 and 2, with electronic control additionally for dusts in zones 21 and 22
  • Suitable for the control of supply or extract air as well as for differential pressure control
  • Electronic or pneumatic control components
  • Closed blade air leakage to EN 1751, up to class 4
  • Casing air leakage to EN 1751, class C

Optional equipment and accessories

  • Spring return actuator
  • Auxiliary switch with adjustable switching points for capturing the end positions
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Application

Application

  • Circular EXCONTROL VAV terminal units of Type TVR-Ex for the precise supply air or extract air flow control in variable air volume systems
  • For use in potentially explosive atmospheres (ATEX)
  • Closed-loop volume flow control using an external power supply
  • Electronic or pneumatic volume flow control
  • Shut-off by means of switching (equipment supplied by others)

Special features

  • ATEX mark and certification
  • ATEX equipment group II, approved for use in zones 1 and 2; electronic control also for zones 21 and 22
  • Volume flow rate can later be measured and adjusted on site; configuration is possible using personal computer software

Classification

Electronic control: Equipment group II

  • Zones 1 and 2 (atmosphere: gases): II 2 G c II T5/T6
  • Zones 21 and 22 (atmosphere: dusts): II 2 D c II 80 °C

Pneumatic control: Equipment group II

  • Zones 1 and 2 (atmosphere: gases): II 2 G c II T5/T6

Nominal sizes

  • 125, 160, 200, 250, 315, 400

 

Description

Construction

  • Galvanised sheet steel
  • P1: Inner duct powder-coated, silver grey (RAL 7001)
  • A2: Inner duct in stainless steel

Parts and characteristics

  • Ready-to-commission unit which consists of mechanical parts and control components.
  • Averaging differential pressure sensor for volume flow rate measurement
  • Damper blade
  • Connection for equipotential bonding
  • Cable bushings suitable for use in potentially explosive atmospheres
  • ATEX-compliant control components, factory assembled and complete with wiring and tubing
  • Aerodynamic functional testing on a special test rig prior to shipping of each unit
  • Unit carries test label with relevant data
  • High control accuracy (even with upstream bend R = 1D)

Attachments

  • Electronic control
  • Pneumatic control

Accessories

  • Actuator with auxiliary switch for capturing the end positions
  • Spring return actuator

Useful additions

  • Secondary silencer Type CA for demanding acoustic requirements

Construction features

  • Construction and materials comply with the EU directive and guidelines for use in potentially explosive atmospheres (ATEX)
  • Spigot with lip seal, for circular connecting ducts to EN 1506 or EN 13180

Materials and surfaces

  • Casing and inner duct made of galvanised sheet steel
  • Control components made of die cast aluminium (pneumatic control: plastic)
  • Plastic bearings
  • Damper blade of stainless steel and with TPE seal (thermoplastic elastomer)
  • Differential pressure sensor made of aluminium
  • P1: Inner duct powder-coated
  • A2: Inner duct in stainless steel

Standards and guidelines

  • Directive 94/9/EC: Equipment and protective systems intended for use in potentially explosive atmospheres
  • Closed blade air leakage to EN 1751, class 4 (nominal sizes 125 and 160, class 3).
  • Nominal sizes 125 and 160 meet the general requirements, nominal sizes 200 – 400 meet the increased requirements of DIN 1946, part 4, with regard to the acceptable closed blade air leakage
  • Casing air leakage to EN 1751, class C

Maintenance

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

Electronic control

  • Zero point correction of the static differential pressure transducer should be carried out once per year (recommendation)

 

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Product Information

 

Certificates

 

Operation Manuals