Type 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

VAV terminal unit Type TVR-Ex 00132058_0


  • Application
  • Description

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

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)

Technische Information

Function, Technical data, Quick sizing, Specification text, Order code, Related Products

  • Function
  • TECHNICAL DATA
  • Quick sizing
  • Specification text
  • Order code
  • RELATED PRODUCTS

Functional description

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.

Volume flow rate ranges

The minimum differential pressure of VAV terminal units is an important factor in designing the ductwork and in rating the fan including speed control.

Sufficient duct pressure must be ensured for all operating conditions and for all control units. The measurement points for fan speed control must be selected accordingly.

The volume flow rates given for VAV terminal units depend on the nominal size and on the control component (attachment) that is installed. The table gives the minimum and maximum values for a VAV terminal unit. Some control components may only have a limited volume flow rate range. This applies in particular to control components with a static differential pressure transducer. For volume flow rate ranges for all control components refer to our Easy Product Finder design programme.

TVR-Ex – ElectronicVolume flow rate ranges and minimum differential pressures

Nominal size
V
l/s
V
m³/h

∆pst min
Pa

∆pst min
Pa

∆pst min
Pa

∆pst min
Pa
∆V
± %
125 22 79 5 5 5 5 15
125 60 216 15 20 20 20 7
125 105 378 45 50 55 60 6
125 150 540 90 100 110 115 5
160 35 126 5 5 5 5 15
160 100 360 15 15 15 15 8
160 175 630 35 40 45 45 7
160 250 900 70 80 85 95 5
200 60 216 5 5 5 5 15
200 160 576 15 15 15 15 7
200 280 1008 35 35 40 40 5
200 405 1458 65 70 75 80 5
250 90 324 5 5 5 5 15
250 245 882 10 10 10 10 7
250 430 1548 25 25 30 35 5
250 615 2214 45 50 55 65 5
315 145 522 5 5 5 5 15
315 410 1476 5 10 10 10 7
315 720 2592 15 20 20 20 6
315 1030 3708 30 35 40 40 5
400 240 864 5 5 5 5 15
400 670 2412 5 5 5 5 7
400 1175 4230 15 15 15 15 6
400 1680 6048 25 30 30 35 5


Nominal size
V
l/s
V
m³/h

∆pst min
Pa

∆pst min
Pa

∆pst min
Pa

∆pst min
Pa
∆V
± %
125 15 54 5 5 5 5 15
125 40 144 10 10 10 10 10
125 70 252 20 25 25 25 7
125 100 360 40 45 50 55 5
160 25 90 5 5 5 5 15
160 75 270 10 10 10 10 10
160 125 450 20 20 25 25 7
160 175 630 35 40 45 45 5
200 40 144 5 5 5 5 15
200 125 450 10 10 10 10 10
200 210 756 20 20 25 25 7
200 300 1080 40 40 45 45 5
250 60 216 5 5 5 5 15
250 200 720 5 10 10 10 10
250 340 1224 15 15 20 20 7
250 475 1710 30 30 35 40 5
315 105 378 5 5 5 5 15
315 330 1188 5 5 5 5 10
315 555 1998 10 10 15 15 7
315 775 2790 20 20 25 25 5
400 170 612 5 5 5 5 15
400 545 1962 5 5 5 5 10
400 920 3312 10 10 10 10 7
400 1300 4680 15 20 20 20 5


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 – 50 °C


Electronic

Supply voltage (AC)

24 V AC ± 10 %, 50/60 Hz

Supply voltage (DC)

24 V DC ± 10 %

Power rating (AC)

20 VA max.

Power rating (DC)

20 W max.

Setpoint value signal input

0 – 10 V DC, Ra > 100 kΩ

Actual value signal output

0 – 10 V DC, max. 0.5 mA

IEC protection class

III (protective extra-low voltage)

Protection level

IP 42

EC conformity

ATEX to 94/9/EG, EMC to 2004/108/EG, low voltage to 2006/95/EG


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






Quick sizing tables provide a good overview of the room sound pressure levels that can be expected. Approximate intermediate values can be interpolated. Precise intermediate values and spectral data can be calculated with our Easy Product Finder design programme.

The first selection criteria for the nominal size are the actual volume flow rates Vmin and Vmax. The quick sizing tables are based on generally accepted attenuation levels. If the sound pressure level exceeds the required level, a larger air terminal unit and/or a silencer is required.

TVR-Ex, electronic, Sound pressure level at differential pressure 150  Pa

Nominal size V Air-regenerated noise Case-radiated noise
Nominal size V
Nominal size V LPA LPA1 LPA2
Nominal size l/s m³/h dB(A)

125

22

79

36

25

16

<15

16

125

60

216

45

36

30

28

25

125

105

378

49

40

34

32

31

125

150

540

52

41

34

32

35

160

35

126

41

30

22

19

22

160

100

360

47

39

34

31

28

160

175

630

50

42

37

34

32

160

250

900

53

44

39

36

37

200

60

216

41

32

24

22

21

200

160

576

47

40

34

33

29

200

280

1008

50

44

40

38

32

200

405

1458

54

45

39

38

38

250

90

324

38

30

24

22

22

250

245

882

47

40

34

32

35

250

430

1548

48

42

38

37

37

250

615

2214

52

44

38

37

42

315

145

522

43

36

29

26

29

315

410

1476

47

42

35

34

39

315

720

2592

49

44

39

38

42

315

1030

3708

53

48

42

41

46

400

240

864

43

36

29

26

31

400

670

2412

44

38

32

30

37

400

1175

4230

47

42

36

35

41

400

1680

6048

50

44

38

37

46

① TVR-Ex

② TVR-Ex with secondary silencer CA, insulation thickness 50 mm, length 500 mm

③ TVR-Ex with secondary silencer CA, insulation thickness 50 mm, length 1000 mm

④ TVR-Ex with secondary silencer CA, insulation thickness 50 mm, length 1500 mm


TVR-Ex, pneumatic, Sound pressure level at differential pressure 150 Pa

Nominal size V Air-regenerated noise Case-radiated noise
Nominal size V
Nominal size V LPA LPA1 LPA2
Nominal size l/s m³/h dB(A)

125

15

54

33

22

<15

<15

<15

125

40

144

39

29

22

19

20

125

70

252

46

37

31

29

26

125

100

360

49

40

34

32

31

160

25

90

40

28

20

16

20

160

75

270

45

35

29

26

25

160

125

450

49

41

36

33

29

160

175

630

50

42

37

34

32

200

40

144

40

31

23

20

20

200

125

450

46

37

31

30

26

200

210

756

48

41

36

35

30

200

300

1080

51

44

40

38

33

250

60

216

41

32

24

22

21

250

200

720

44

36

31

29

30

250

340

1224

47

40

35

34

36

250

475

1710

49

42

38

37

38

315

105

378

42

35

28

25

28

315

330

1188

45

40

33

31

35

315

555

1998

47

42

36

35

40

315

775

2790

50

44

39

38

43

400

170

612

43

36

30

26

30

400

545

1962

43

37

31

29

35

400

920

3312

45

40

34

33

39

400

1300

4680

48

42

37

35

43

① TVR-Ex

② TVR-Ex with secondary silencer CA, insulation thickness 50 mm, length 500 mm

③ TVR-Ex with secondary silencer CA, insulation thickness 50 mm, length 1000 mm

④ TVR-Ex with secondary silencer CA, insulation thickness 50 mm, length 1500 mm


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-assembled 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.

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

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

Construction

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

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 the nominal volume flow rate
  • Maximum differential pressure: 1000 Pa

Attachments

Variable volume flow control with electronic controller to switch a control signal and an actual value signal for integration into the central BMS.

  • Supply voltage 24 V AC
  • Supply voltage for actuator: 230 V AC
  • Signal voltages 0 – 10 V DC
  • The actual value signal relates to the nominal volume flow rate such that commissioning and subsequent adjustment are simplified
  • Volume flow rate control range: approx. 15 – 100 % of the nominal volume flow rate
  • Actuator with adjustable running time, 7.5 – 120 s

Sizing data

  • V _______________________ [m³/h]
  • Δpst _______________________ [Pa]

Air-regenerated noise

  • LPA _______________________ [dB(A)]

Case-radiated noise

  • LPA _______________________ [dB(A)]

This specification text describes the general properties of the product. Texts for variants can be generated with our Easy Product Finder design programme.

Order example: TVR-Ex/200/S1S/400–1200 m³/h

Material

Galvanised sheet steel

Nominal size

200 mm

Attachments

Electronic controller, internal, pressure transducer and actuator

Volume flow rate

400 – 1200 m³/h


Order example: TVR-Ex/160/PG5/200–500 m³/h/NO

Material

Galvanised sheet steel

Nominal size

160 mm

Attachments

Pneumatic volume flow controller with actuator

Volume flow rate

200 – 500 m³/h

Damper blade position

Pressure off to OPEN


Order example: TVR-Ex/160/TES/SC–E0/T/200–900 m³/h

Material

Galvanised sheet steel

Nominal size

160 mm

Attachments

Electronic controller, external, pressure transducer and actuator with auxiliary switch

Equipment function

Supply air controller

Expansion modules

EM-TRF for 230 V AC

Volume flow rate

200 – 900 m³/h


 

Additional products
Type CA

Variants, Attachments, Dimensions and weight

  • Variants
  • ATTACHMENTS
  • Dimensions and weight

TVR-Ex, EXCONTROL Electric control components

Order code detail Controlled variable Controller Differential pressure transducer Actuator

Internal controller





S1S

Volume flow rate

Universal controller (use in areas with potentially explosive atmospheres) Schischek

Static, integral

Actuator

S1F

Volume flow rate

Universal controller (use in areas with potentially explosive atmospheres) Schischek

Static, integral

Spring return actuator

S1X

Volume flow rate

Universal controller (use in areas with potentially explosive atmospheres) Schischek

Static, integral

Actuator with auxiliary switches

S1Y

Volume flow rate

Universal controller (use in areas with potentially explosive atmospheres) Schischek

Static, integral

Spring return actuator with auxiliary switch

External controller





TES

Volume flow rate

Volume flow rate controller TCU3 (use in areas with potentially explosive atmospheres) TROX/Schischek

Static

Actuator

TEF

Volume flow rate

Volume flow rate controller TCU3 (use in areas with potentially explosive atmospheres) TROX/Schischek

Static

Spring return actuator

TEX

Volume flow rate

Volume flow rate controller TCU3 (use in areas with potentially explosive atmospheres) TROX/Schischek

Static

Actuator with auxiliary switches

TEY

Volume flow rate

Volume flow rate controller TCU3 (use in areas with potentially explosive atmospheres) TROX/Schischek

Static

Spring return actuator with auxiliary switch


TVR-Ex, EXCONTROL Pneumatic control components

Order code detail Controlled variable Controller Differential pressure transducer Actuator

Volume flow controllers





PG5

Volume flow rate

Volume flow controller Sauter

Integral

Actuator

Pressure and volume flow cascade





PJ5

Room pressure

Room pressure controller ± 20 Pa Volume flow controller Sauter

Integral

Actuator

PL5

Room pressure

Room pressure controller ± 50 Pa Volume flow controller Sauter

Integral

Actuator

TVR-Ex 00186651_0


Nominal size
ØD
mm
B3
mm
H3
mm
C
mm
125 124 372 221 129
160 159 372 221 111
200 199 463 311 182
250 249 463 311 157
315 314 627 461 289
400 399 627 461 246


Nominal size
TVR-Ex/.../TEx
m
kg
TVR-Ex/.../Pxx
m
kg
125 17.5 15.5
160 17.5 15.5
200 19.0 17.0
250 19.0 17.0
315 23.0 21.0
400 23.0 21.0





Installation details, Basic information and nomenclature

  • Installation details
  • Basic information and nomenclature

Installation and commissioning

  • Connections for equipotential bonding: Suitable cables must be connected by others


Electronic control

  • Any installation orientation
  • Zero point correction required


Pneumatic control

  • Installation orientation must be as shown on the sticker

Upstream conditions

The volume flow rate accuracy ΔV applies to a straight upstream section of the duct. Bends, junctions or a narrowing or widening of the duct cause turbulence that may affect measurement. Duct connections, e.g. branches off the main duct, must comply with EN 1505. Some installation situations require straight duct sections upstream.

Space required for commissioning and maintenance

Sufficient space must be kept clear near any attachments to allow for commissioning and maintenance. It may be necessary to provide sufficiently sized inspection access openings.

Space required

Nominal size
Nominal size mm

125

600

220

300

160

600

220

300

200

600

310

300

250

600

310

300

315

600

460

300

400

600

460

300


Principal dimensions

ØD [mm]

VAV terminal units made of stainless steel: Outside diameter of the spigot

VAV terminal units made of plastic: Inside diameter of the connecting spigot

ØD₁ [mm]

Pitch circle diameter of flanges

ØD₂ [mm]

Outside diameter of flanges

ØD₄ [mm]

Inside diameter of the screw holes of flanges

L [mm]

Length of unit including connecting spigot

L₁ [mm]

Length of casing or acoustic cladding

B [mm]

Duct width

B₁ [mm]

Screw hole pitch of flange (horizontal)

B₂ [mm]

Outside dimension of flange (width)

B₃ [mm]

Width of device

H [mm]

Duct height

H₁ [mm]

Screw hole pitch of flange (vertical)

H₂ [mm]

Outside dimension of flange (height)

H₃ [mm]

Unit height

n [ ]

Number of flange screw holes

T [mm]

Flange thickness

m [kg]

Unit weight including the minimum required attachments (e.g. Compact controller)

Acoustic data

fm [Hz]

Octave band centre frequency

LPA [dB(A)]

A-weighted sound pressure level of air-regenerated noise of the VAV terminal unit, system attenuation taken into account

LPA1 [dB(A)]

A-weighted sound pressure level of air-regenerated noise of the VAV terminal unit with secondary silencer, system attenuation taken into account

LPA2 [dB(A)]

A-weighted sound pressure level of case-regenerated noise of the VAV terminal unit, system attenuation taken into account

LPA3 [dB(A)]

A-weighted sound pressure level of case-regenerated noise of the VAV terminal unit with acoustic cladding, system attenuation taken into account


All sound pressure levels are based on 20 μPa.

Volume flow rates

Vnom [m³/h] and [l/s]

Nominal volume flow rate (100 %)

  • The value depends on product type and nominal size
  • Values are published on the internet and in technical leaflets, and stored in the Easy Product Finder design software.
  • Reference value for calculating percentages (e.g. Vmax)
  • Upper limit of the setting range and maximum volume flow rate setpoint value for the VAV terminal unit

Vmin unit [m³/h] and [l/s]

Technically possible minimum volume flow rate

  • The value depends on product type, nominal size and control component (attachment)
  • Values are stored in the Easy Product Finder design software
  • Lower limit of the setting range and minimum volume flow rate setpoint value for the VAV terminal unit
  • Depending on the controller, setpoint values below Vmin unit (if Vmin equals zero) may result in unstable control or shut-off

Vmax [m³/h] and [l/s]

Upper limit of the operating range for the VAV terminal unit that can be set by customers

  • Vmax can only be smaller than or equal to Vnom
  • In case of analogue signalling to volume flow controllers (which are typically used), the set maximum value (Vmax) is allocated to the setpoint signal maximum (10 V) (see characteristic)

Vmin [m³/h] and [l/s]

Lower limit of the operating range for the VAV terminal unit that can be set by customers

  • Vmin should be smaller than or equal to Vmax
  • Do not set Vmin smaller than Vmin unit, otherwise the control may become unstable or the damper blade may close
  • Vmin may equal zero
  • In case of analogue signalling to volume flow controllers (which are typically used), the set minimum value (Vmin) is allocated to the setpoint signal minimum (0 or 2 V) (see characteristic)

V [m³/h] and [l/s]

Volume flow rate

ΔV [± %]

Volume flow rate tolerance from setpoint value

ΔVwarm [± %]

Volume flow rate tolerance for the warm air flow of dual duct terminal units

Differential pressure

Δpst [Pa]

Static differential pressure

Δpst min [Pa]

Static differential pressure, minimum

  • The static minimum differential pressure is equal to the pressure loss of the VAV terminal unit when the damper blade is open, caused by flow resistance (sensor tubes, damper mechanism)
  • If the pressure on the VAV terminal unit is too low, the setpoint volume flow rate may not be achieved, not even when the damper blade is open
  • Important factor in designing the ductwork and in rating the fan including speed control
  • Sufficient duct pressure must be ensured for all operating conditions and for all terminal units, and the measurement point or points for speed control must have been selected accordingly to achieve this

Construction

Galvanised sheet steel

  • Casing made of galvanised sheet steel
  • Parts in contact with the airflow as described for the product type
  • External parts, e.g. mounting brackets or covers, are usually made of galvanised sheet steel

Powder-coated surface (P1)

  • Casing made of galvanised sheet steel, powder-coated RAL 7001, silver grey
  • Parts in contact with the airflow are powder-coated or made of plastic
  • Due to production, some parts that come into contact with the airflow may be stainless steel or aluminium, powder-coated
  • External parts, e.g. mounting brackets or covers, are usually made of galvanised sheet steel

Stainless steel (A2)

  • Casing made of stainless steel 1.4201
  • Parts in contact with the airflow are powder-coated or made of stainless steel
  • External parts, e.g. mounting brackets or covers, are usually made of galvanised sheet steel

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