TVR-Ex

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)

Technical information

Schematic illustration of the TVR-Ex with electronic control

① Auxiliary switch
② Static differential pressure transducer
③ Terminal box
④ Cable gland
⑤ Equipotential bonding
⑥ Actuator

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.

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

Electronic control with attachment S1S, S1F, S1X or S1Y

S1S	Schischek: Controller ExReg-V-300-A + actuator ExMax-5.10-CY
S1F	Schischek: Controller ExReg-V-300-A + spring return actuator ExMax-5.10-CYF
S1X	Schischek: Controller ExReg-V-300-A + actuator ExMax-5.10-CY + accessories ExSwitch and ExBox
S1Y	Schischek: Controller ExReg-V-300-A + spring return actuator ExMax-5.10-CYF + accessories ExSwitch and ExBox
Supply voltage	24 V AC + 15% (24.0 ... 27.6 V AC), 50/60 Hz
Supply voltage	24 V DC + 15% (24.0 ... 27.6 V DC)
IEC protection class	III (protective extra-low voltage)
EC conformity	ATEX to 2014/34/EU, EMC to 2014/30/EU, low voltage to 2014/35/EU

The information given here is just to give you an idea.

For the latest information on the electronic attachments please refer to the technical data in the manufacturer's product documentation:
Schischek GmbH, 90579 Langenzenn, Germany, www.schischek.com, info@schischek.com
For the ExReg-V volume flow controller see the documentation from version V04 of 3 June 2022

Electronic control with attachment TES, TEF, TEX or TEY
Components

TES	TROX controller TCU3 + Schischek components: differential pressure transducer ExCos-P, actuator ExMax-5.10-Y
TEF	TROX: Controller TCU3 + Schischek components: differential pressure transducer ExCos-P, spring return actuator ExMax-5.10-YF
TEX	TROX: Controller TCU3 + Schischek components: differential pressure transducer ExCos-P + actuator ExMax-5.10-Y + accessories ExSwitch and ExBox
TEY	TROX: Controller TCU3 + Schischek components: differential pressure transducer ExCos-P + spring return actuator ExMax-5.10-YF + accessories ExSwitch and ExBox

Controller TCU3 (TROX)

Supply voltage	24 V AC ±15% (20.4 .. 27.6 V), 50/60 Hz
Supply voltage	24 V DC ±15% (20.4 .. 27.6 V)
Supply voltage	Optional: 230 V AC mains supply (only with expansion module EM-TRF)
Power rating	8 VA
Protection level	IP 20
IEC protection class	III (protective extra-low voltage) if 24 V AC/DC is used
Installation	In closed rooms, outside of Ex zones (the TCU3 has to be installed away from TVR-Ex)
EC conformity	EMC to 2014/30/EU

Differential pressure transducer (Schischek)

Supply voltage	24 V AC ±20% (19.2 .. 28.8 V), 50/60 Hz
Supply voltage	24 V DC ±20% (19.2 .. 28.8 V)
IEC protection class	I (earthed)
Protection level	IP 66
EC conformity	ATEX to 2014/34/EU, EMC to 2014/30/EU

Actuator/spring return actuator (Schischek)

Supply voltage	24... 240 V AC/DC, ±10%, self-adjusting, 50 – 60 Hz ±20%
Supply voltage	We recommend a mains connection for the actuator
Power rating	Be sure to see the additional information in the Schischek documentation
IEC protection class	I (earthed)
Protection level	IP 66
EC conformity	ATEX to 2014/34/EU, EMC to 2014/30/EU, low voltage to 2014/35/EU

The information given here is just to give you an idea.
For the latest information on the electronic attachments please refer to the technical data in the manufacturer's product documentation:
Schischek GmbH, 90579 Langenzenn, Germany, www.schischek.com, info@schischek.com

Pneumatic

Operating pressure	1.3 bar ± 0.1 bar
Air consumption – volume flow control	50 ln/h
Air consumption – pressure and volume flow cascade	100 ln/h
Control pressure	0.2 – 1.0 bar
Maximum pressure	1.5 bar
Compressed air	Compressed air for instruments, free of oil, water and dust
Protection level	IP 42

VAV terminal units for variable and constant air volume systems in potentially explosive atmospheres, suitable for supply or extract air, available in 6 nominal sizes.

High control accuracy (even with upstream bend R = 1D). Ready-to-commission unit which consists of the mechanical parts, the electronic control components, and parts for equipotential bonding and for use in potentially explosive atmospheres. Each unit contains an averaging differential pressure sensor for volume flow rate measurement and a damper blade.

Factory mounted control components complete with wiring and tubing.

Differential pressure sensor with 3 mm measuring holes (resistant to dust and pollution)

Spigot with lip seal, for circular connecting ducts to EN 1506 or EN 13180.

Closed blade air leakage to EN 1751, class 4 (nominal sizes 125 and 160, class 3).

Casing air leakage to EN 1751, class C.