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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
  • Suitable for the control of supply or extract air as well as for differential pressure control

  • Suitable for the control of supply or extract air as well as for differential pressurecontrol
  • 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
  • General information

    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
    • The volume flow rate can later be measured and adjusted on site; configuration is possible using personal computer software

    Nominal sizes

    125, 160, 200, 250, 315, 400

    Classification

    • Electronic control: Equipment group II

    Attachments

    • Electronic control
    • Pneumatic control

    Variants

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

    Technical data

    • Nominal sizes: 125 to 400 mm
    • Volume flow rate range: 15 to 1680 l/s or 54 to 6048 m³/h
    • Volume flow rate control range: approx. 15 – 100 % of thenominal volume flow rate
    • Maximum differential pressure: 1000 Pa
    • Operating temperature: 10 to 50 °C

    Useful additions

    • Circular silencer CA or CAH (for Germany and Switzerland) or CAH (for EMEA) for demanding acoustic requirements

    Construction features

    • Construction and materials comply with the EU directive and guidelines for use in potentially explosive atmospheres (ATEX)
    • Zones 1 and 2 (atmosphere: gases):II 2 G c II T5: 10 °C - 50°C and T6: 10 °C - 60 °C
    • Zones 21 and 22 (atmosphere: dusts):II 2 D c II 80 °C Pneumatic control: Equipment group II
    • 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
    • Zones 1 and 2 (atmosphere: gases):II 2 G c II T5: 10 °C - 50°C and T6: 10 °C - 60 °C

    Construction

    • Galvanised sheet steel
    • P1: Inner duct powder-coated RAL 7001, silver grey
    • 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 glands suitable for use in potentially explosive atmospheres
    • ATEX-compliant control components, factory mounted and complete with wiring and tubing
    • Aerodynamic functional testing on a special test rig before shipping of each unit
    • Set-up data is given on a label affixed to the unit
    • High control accuracy (even with upstream bend R = 1D)
    • Control components made of die cast aluminium (pneumatic control: plastic)
    • Plastic bearings
    • Damper blade of stainless steel with thermoplastic elastomer seal TPE
    • Differential pressure sensor made of aluminium
    • P1: Inner duct powder-coated
    • A2: Inner duct in stainless steel

    Standards and guidelines

    • Directive 2014/34/EU: Equipment and protective systems intended for use in potentially explosive atmospheres

    Maintenance

    • Maintenance-free as construction and materials are not subject to wear
    • Zero point correction of the static differential pressure transducer should be carried out once per year (recommendation, with electronic control)

    Commissioning

    • The controller parameters are factory set
    • Adjustments may be required as part of commissioning (by others)

    Teknisk informasjon

    • ‌ Function
    • ‌ TECHNICAL DATA
    • Specification text
    • ORDER CODE

    The VAV terminal unit is fitted with a differential pressure sensor for measuring the volume flow rate.

    The control components (attachments) include a differential pressure transducer that transforms the differential pressure (effective pressure) into an electric signal, a controller, and an actuator.

    For most applications, the setpoint value comes from a room temperature controller which is installed outside of the potentially explosive atmosphere.

    The controller compares the actual value with the setpoint value and alters the control signal of the damper actuator if there is a difference between the two values.

    The connections for the supply voltage and for the voltage signals are made in a terminal box that is suitable for use in potentially explosive atmospheres.


    Nedlastinger

    Produkt informasjon

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