VMRK-250-XTS_gc_10png.png
Volume flow rate measuring unit VMRK
Easy cleaning of sensor tubes
Variant with flange
VMRK with control component BTS 
VMRK-Elab_gc_15png.png
TVRK with control component ELAB TCU3

VMRK with control component ELAB TCU3

VMRK with control component ELAB TCU3

00132715_0
Tested to VDI 6022


VMRK-250-XTS_gc_10png.png
VMRK-Elab_gc_15png.png
00132715_0

VMRK  

For the measurement of volume flow rates in ducts with contaminated air

Plastic circular volume flow rate measuring devices for recording or monitoring the
volume flow rate

  • Manual volume flow rate measurement
  • Permanent volume flow rate measurement
  • Recording of measured values for other controllers or the air management system  
  • Optional effective pressure transducer for the automatic recording of measured values, factory assembled and complete with wiring and tubing
  • Casing made of flame-resistant polypropylene (PPs)
  • Casing leakage according to EN 15727, class D

 


Optional equipment and accessories

  • With flanges on both ends
  • Lip seal
  • Static effective pressure transducer

 


 


 

Application

Application
  • Plastic circular volume flow rate measuring units for the manual or automatic measuring of volume flow rates
  • Suitable for contaminated air
  • Simplified commissioning, approval and maintenance
  • Suitable for permanent installation because of low differential pressure


Special features
  • High measurement accuracy, even in unfavourable upstream conditions
  • Effective pressure range of 5 – 260 Pa
  • Low differential pressure of only about 15 – 24 % of the measured effective pressure



Nominal sizes
  • 125, 160, 200, 250, 315, 400


Description



Variants

  • VMRK: Volume flow rate measuring unit
  • VMRK-FL: Volume flow rate measuring unit with flanges on both ends




Parts and characteristics

  • Ready-to-commission unit which consists of the mechanical parts and optional effective pressure transducers
  • Averaging differential pressure sensor for volume flow rate measurement; can be removed for cleaning
  • Optional effective pressure transducers, factory assembled and wired
  • High measurement accuracy of volume flow rates (even with bend R = 1D).



Attachments

Effective pressure transducer for static pressure measurements

  • XTS Type GT-VM-DS3
  • BTS Type VRU-M1-M/B 
  • ELAB: EASYLAB air management system


Accessories

  • Matching flanges for both ends, including seals


Construction features

  • Circular casing
  • Spigot suitable for ducts according to DIN 8077
  • Both spigots with same diameter
  • Connection points for tubes with 6 mm inside diameter
  • The optional matching flange comes complete with a suitable seal


Materials and surfaces

  • Casing and damper blade made of flame-resistant polypropylene (PPs)
  • Effective pressure sensor made of polypropylene (PP)
  • Damper blade seal made of chloroprene rubber (CR)


Standards and guidelines

Fulfils the hygiene requirements of

  • EN 16798, Part 3
  • VDI 6022, Sheet 1
  • DIN 1946, Part 4
  • Further standards, guidelines in accordance with hygiene certificate


Casing leakage

  • EN 1751, Class D


Closed damper blade air leakage

  • EN 1751, Class 3
  • Meets the general requirements of DIN 1946, part 4, with regard to the acceptable closed damper blade air leakage


Maintenance

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

Technical information

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

  • Function
  • TECHNICAL DATA
  • QUICK SIZING
  • SPECIFICATION TEXT
  • ORDER CODE
VMRK-125-BTS_gc_09ai.png

1: Effective pressure sensor
2: Measuring transducer
3: Casing

1: Effective pressure sensor
2: Measuring transducer
3: Casing


The volume flow rate measuring unit is fitted with an effective pressure sensor for measuring the volume flow rate. The effective pressure is either measured and evaluated manually, or transformed into an electrical signal by a measuring transducer (effective pressure transducer).


Nominal sizes125 – 400 mm
Volume flow rate range20 – 1660 l/s or 70 – 5978 m³/h
Maximum differential pressure1000 Pa
Effective pressure range

Approx. 5 – 260 Pa*

Measurement accuracy

5 – 10 % 


Operating temperature10 to 50 °C

* 260 Pa with nominal flow rate


 

Die Schnellauslegung gibt einen guten Überblick über die Volumenstrommessbereiche, Messgenauigkeiten und die C-Werte der einzelnen Nenngrößen. Berechnung der Volumenströme aus den gemessenen Wirkdrücken bei Ausführung ohne Anbauteile siehe in Abschnitt „Produktdetails“.

Volume flow rate ranges 
Attachment: XTS, BTS, ELAB or no attachment

NSqv [l/s]qv [m³/h]K value  [l/s] K value  [m³/h] Δqv [±%]
12520708,631,010
1251384998,631,06
1603412215,154,010
16024387615,154,05
2005519624,387,510
200391141024,387,55
2508530638,0136,810
250612220538,0136,85
31513950062,0223,210
315999359862,0223,25
400231830103,0370,810
40016605978103,0370,85

Note:

  • K values for air density 1.2 kg/m³ at 20°C
  • Δpv in relation to the measured effective pressure

Specification text

Circular volume flow rate measuring device made of PPs plastic, for variable and constant air volume systems, suitable for extract air, available in 6 nominal sizes. For manual volume flow rate measurement or for the permanent monitoring of the actual value signal. High measurement accuracy of volume flow rates (even with bend R = 1D). Ready-to-commission unit which consists of the mechanical parts and an optional pressure transducer. Slide-out sensors allow for easy cleaning

Each unit contains an averaging effective pressure sensor for volume flow rate measurement. Effective pressure sensor with 3 mm measuring holes, hence resistant to contamination.

Meets the hygiene requirements of EN 16798, Part 3, of VDI 6022, Sheet 1, and of DIN 1946, Part 4.


Special features
  • High measurement accuracy, even in unfavourable upstream conditions
  • Effective pressure range of 5 – 260 Pa
  • Low differential pressure of only about 15 – 24 % of the measured effective pressure


Materials and surfaces
  • Casing made of flame-resistant polypropylene (PPs)
  • Differential pressure sensor made of polypropylene (PP)


Connection
  • Spigot, suitable for ducts according to DIN 8077.


Technical data
  • Nominal sizes: 125 to 400 mm
  • Volume flow rate range: 20 – 1660 l/s or 70 – 5978 m³/h
  • Effective pressure range: approx. 5 – 260 Pa
  • Differential pressure of measuring unit (pressure loss): 15 – 24 % of the measured effective pressure
  • Measurement accuracy ± 5 % – ±10 % even with unfavourable upstream conditions
  • Operating temperature: 10 to 50 °C
  • Casing air leakage to EN 15727, class D
  • Maximum differential pressure: 1000 Pa


Order code for volume flow rate measuring unit (with optional VARYCONTROL attachment)
VMRK – FL / 160 / GK / XTS / 0
||||||
123456

1 TypeVMRK Plastic volume flow rate measuring unit 2 FlangeNo entry required: NoneFL Flanges on both ends 3 Nominal size [mm]125, 160, 200, 250, 315, 400 4 AccessoriesNo entry required: NoneGK Matching flanges for both ends, including seals 5 Attachments (differential pressure transducer)No entry required: NoneXTS static effective pressure transducer, analogue, displayBTS static effective pressure transmitter, analogue, and MP-Bus, Modbus RTU, BACnet MS/TP
 
6 Signal voltage rangeOnly required if attachment is selectedFor the actual value signal0 0 – 10 V DC2 2 – 10 V DC

Order example 1: VMRK-FL/315/GK/XTS/0
Duct connectionFlanges on both ends
Nominal size315 mm
AccessoriesMatching flange
Attachments (effective pressure transducer)Static effective pressure transducer XTS
Actual value signal0 – 10 V DC

,
Order code for volume flow rate measuring unit (with EASYLAB attachment for recording measured values)
VMRK–FL/160/GK/ELAB/EC–E0/UMZ
| | | | | | | |
1 2 3 4 5 6 7 8

1 TypeVMRK Volume flow rate measuring unit, plastic 2 FlangeNo entry: NoneFL Flanges on both ends 3 Nominal size [mm]125160200250315400 4 AccessoriesNo entry: NoneGK Matching flanges both sides 5 Attachments (control components)ELAB EASYLAB TCU3 6 Equipment functionEC Extract air recording 7 Voltage range for the actual value signalE0 Voltage signal 0 – 10 V DCE2 Voltage signal 2 – 10 V DC 8 Expansion modulesOption 1: Power supplyNo entry: 24 V ACT EM-TRF for 230 V ACU EM-TRF-USV for 230 V AC, provides uninterruptible power supply (UPS) Option 2: Communication interfaceNo entry: None B EM-BAC-MOD-01 for BACnet MS/TPM EM-BAC-MOD-01 for Modbus RTUI EM-IP for BACnet/IP, Modbus/IP and web serverR EM-IP with real time clock Option 3: Automatic zero point correctionNo entry: NoneZ EM-AUTOZERO Solenoid valve for automatic zero point correction

Order example 1: VMRK/200/ELAB/EC/E2/TZ
Duct connectionSpigot
Nominal size200 mm
Attachments EASYLAB TCU3
Equipment functionExtract air controller
External volume flow rate settingVoltage signal 2 – 10 V DC
Expansion moduleWith expansion module EM-TRF, transformer for 230 V AC supply with expansion module EM-AUTOZERO, solenoid valve for automatic zero point correction
 

Variants, Dimensions and weights, Product details

  • VARIANTS
  • DIMENSIONS AND WEIGHT
  • PRODUCT DETAILS
Volume flow rate measuring unit VMRK
Volume flow rate measuring unit VMRK

Spigot

Volume flow rate measuring unit VMRK
Volume flow rate measuring unit VMRK-FL


  • Spigot
  • With flanges to make detachable connections to the ductwork


Materials

Standard construction

Order code detail Part Material

–

 		Casing
Effective pressure sensor
 Plastic, polypropylene (PPs), flame resistant


Optional flange

Order code detail Part Material

FL

 		Flange Plastic, polypropylene (PPs), flame resistant


Optional matching flange

Order code detail Part Material

GK

 		Sea
Matching flange
 Rubber, EPDM
Plastic, polypropylene (PPs), flame resistant
Standard construction
Standard construction
Standard construction
Circular, with flanges on both ends
Access to attachments
Access to sensor tubes for cleaning
Access to sensor tubes for cleaning

Dimensions and weights of VMRK (standard) 

NG L ∅D B₃ H₃ kg
125 394 125 195 145 0.8
160 394
 160 230 180 1
200 394
 200 270 270 1.4
250 394
 250 320 270 2.4
315 394
 315 385 335 4
400 394
 400 470 420 5.8

Note: 
Weights (~) apply only to VMRK without any attachments. 
Note that an optional effective pressure transducer (attachment BTS, XTS or ELAB) may add to the weight.

 

Dimensions and weights of VMRK-FL

NG L ∅D ∅D₁ ∅D₂ B₃ H₃ D n kg
125 400 125 165 185 195 145 8 8 1.1
160 400 160 200 230 230 180 8 8 1.4
200 400 200 240 270 270 270 8 8 1.9
250 400 250 290 320 320 270 8 12 2.9
315 600 315 350 395 385 335 10 12 5
400 600 400 445 475 470 420 10 16 7

Note: 
Weights (~) apply only to VMRK with flange and matching flange, but without any attachments. 
Note that an optional effective pressure transducer (attachment BTS, XTS or ELAB) may add to the weight


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. Product illustrations do not show any installation situation details. If an attachment requires a certain installation orientation, this is specified on a sticker on the product.


Space required 

Attachment ① ② ③

Effective pressure transducer: BTS, XTS

 		300 320 300

Effective pressure transducer: ELAB

 		350 350 400



Space required for cleaning the sensor tubes

Nominal size
①
②
③

④

⑤

⑥

125 – 200

100

100

D

–

–

–

250 – 400

100

160

D

100

160

D

D: Casing diameter


Schematic illustration of required installation space
Note:
Weights apply only to VMRK with flange and matching flange, but without any attachments. Note that an optional effective pressure transducer (attachment BTS, XTS or ELAB) may add to the weight.


Bend
VMR_gc_09ai.png

A bend with a curvature radius of at least 1D – without an additional straight duct section upstream of the volume flow rate measuring unit – has only a negligible effect on the volume flow rate accuracy.

VMR_gc_09ai.png
VMR_gc_08ai.png
Volume flow rate calculation for air density 1.2 kg/m³
Volume flow rate calculation for other air densities
Calculation procedure

Calculation conditions

  • The volume flow rate is calculated based on the measured effective pressure
  • The effective pressure is measured using an electronic manometer or an inclined tube manometer
  • Air density ρ = 1.2 kg/m3


Given data
  • VMRK/160
  • Δpw = 100 Pa (manometer reading of effective pressure)
  • Volume flow rate qv in m³/h


Device data
  • K value from table: K = 54 m3/h (15.1 l/s)


Installation and commissioning
  • The installation orientation of ELAB must be as shown on the sticker
  • The installation orientation of XTS and BTS is not critical


Upstream conditions
The volume flow rate accuracy Δqv 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.

Optional attachments for effective pressure transducers 

Attachment Actual value Effective pressure transducer Manufacturer
Effective pressure transducer, static
XTS 0 – 10 V or 2 – 10 V integral ①
BTS 0 - 10 V or 2 - 10 V or MP bus or Modbus RTU or BACnet MS/TP integral ②
ELAB

TROX plug and play communication system and 0 - 10 V or 2 - 10 V or with optional accessories: Modbus, BACnet, web server

 		integral ③

① TROX/Gruner, ② TROX/Belimo, ③ TROX

Downloads

product information

  • Product data sheet Type VMRK

    VMRK_PD_2024_11_04_DE_en Product data sheet 11 MB pdf

  • Product data sheet control component XTS

    XTS_PD_2022_02_21_DE_en Poduct data sheet 680 KB pdf

  • Product data sheet control components XD0

    XD0_PD_2022_01_24_DE_en Product data sheet 520 KB pdf

  • Product data sheet control components XD4

    XD4_PD_2020_02_14_DE_en Product data sheet 920 KB pdf

  • Product data sheet control components XF0

    XF0_PD_2021_06_01_DE_en Product data sheet 490 KB pdf

  • Product data sheet control components XF4

    XF4_PD_2021_06_01_DE_en Product data sheet 890 KB pdf

certificates

  • Certificate Statement Type VMRK

    Certificate Statement 130 KB pdf

  • Certificate concerning statistical leakage tests

    LC_v1_2024_10_DE_en Certificate  660 KB pdf

  • Declaration of hygiene conformity VMRK

    VMRK_HC_2024_05_DE_en Hygiene certificate 1,6 MB pdf

  • Non-CE Manufacturer's statement VMRK

    VMRK_NotCE_2022_02_08_14_44_12_DE_en Certificate 1,6 MB pdf

operation manuals

  • VMRK Assembly and operating instructions 

    VMRK_IOM_CD10031_V2_2024_01_GB_en 1,5 MB pdf

TROX Services

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