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)

Download

Product Information

Certificates

Operation Manuals