Type VMRK

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

Plastic circular volume flow rate measuring units for the recording or monitoring of volume flow rates

  • Manual volume flow rate measuring
  • Permanent volume flow rate measuring
  • Recording of measured values for other controllers or for the LABCONTROL air management system
  • 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 air leakage to EN 15727, class C


Optional equipment and accessories

  • With flanges on both ends

Volume flow rate measuring unit, variant VMRK-FL 00136341_0


  • Application
  • Description

Application

  • Plastic circular volume flow rate measuring units Type VMRK 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

  • Measurement accuracy ± 5 % even with unfavourable upstream conditions
  • Effective pressure range: approx. 5 – 250 Pa
  • Low differential pressure of only about  15 – 24 % of the measured effective pressure

Nominal sizes

  • 125, 160, 200, 250, 315, 400

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 an optional pressure transducer
  • Averaging differential pressure sensor for volume flow rate measurement; can be removed for cleaning
  • Optional factory-assembled pressure transducers complete with wiring and tubing
  • High measurement accuracy (even with upstream bend R = 1D).

Attachments

  • Static differential pressure transducer
  • LABCONTROL components for air management systems

Accessories

  • Matching flanges for both ends, including seals

Construction features

  • Circular casing
  • Spigot suitable for ducts according to DIN 8077
  • Connecting nipple for tubes with 6 mm inside diameter

Materials and surfaces

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

Standards and guidelines

  • Hygiene conforms to VDI 6022
  • Casing air leakage to EN 15727, class C

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)

Technical information

Function, Technical data, Specification text, Order code, Produktbeziehungen

  • Function
  • Technical data
  • Specification text
  • Order code

Functional description

The 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 electric signal by a pressure transducer.

Nominal sizes

125 – 400 mm

Volume flow rate range

25 – 1680 l/s or 90 – 6048 m³/h

Measurement accuracy

± 5 % of the measured value

Effective pressure range

approx. 5 – 250 Pa

Measuring unit differential pressure (pressure loss)

15 – 24 % of the measured effective pressure

Operating temperature

10 – 50 °C




Plastic (PPs) circular volume flow rate measuring unit for the measurement of volume flow rates in air conditioning systems, available in 6 nominal sizes.

For the manual volume flow rate measuring or for the permanent monitoring of the actual value signal.

Ready-to-commission unit which consists of the casing with an averaging differential pressure sensor.

Spigot, suitable for ducts according to DIN 8077.

Casing air leakage to EN 15727, class C.

Special features

  • Measurement accuracy ± 5 % even with unfavourable upstream conditions
  • Effective pressure range: approx. 5 – 250 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)

Technical data

  • Nominal sizes: 125 – 400 mm
  • Volume flow rate range: 25 to 1680 l/s or 90 to 6048 m³/h
  • Effective pressure range: approx. 5 – 250 Pa
  • Measuring unit differential pressure (pressure loss): 15 – 24 % of the measured effective pressure
  • Operating temperature: 10 to 50 °C

Attachments

Volume flow rate measurement with static differential pressure transducer emitting an actual value signal for integration into the central BMS.

  • Supply voltage 24 V AC/DC
  • Signal voltages 0 – 10 V DC or 2 – 10 V DC
  • EASYLAB: Integration using either 0 – 10 V DC signals or expansion modules (LonWorks, BACnet MS/TP, Modbus RTU)

Sizing data

  • V _______________________ [m³/h]

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

Notes on the order code

VMRK/.../ELAB/FH-*

  • VMRK volume flow rate measuring units with EASYLAB TCU3 controllers are not certified for use with fume cupboards to EN 14175, part 6 (Fume cupboards – Variable air volume fume cupboards)

Order example: VMRK/160/BB0

Nominal size

160 mm

Differential pressure transducer

Static


 

Variants, Attachments, Dimensions and weight

  • Variants
  • Attachments
  • Dimensions and weight

VMRK

  • Volume flow rate measuring unit
  • Spigot to make connections to the ducting

VMRK-FL

  • Volume flow rate measuring unit
  • With flanges on both ends to make detachable connections to the ducting

VMRK, VARYCONTROL differential pressure transducers

Order code detail Differential pressure transducer Measurement principle

Universal



BB0

Universal controller with separate differential pressure transducer TROX/Belimo

Static


VMRK, LABCONTROL differential pressure transducers

Order code detail Differential pressure transducer Measurement principle

EASYLAB



ELAB

EASYLAB TCU3 (recording of measured values for EASYLAB system)

Static


Anbauteile: VARYCONTROL Regelkomponenten

Regel- größe Schnittstelle Vmin -/ Vmax - Verstellung Differenzdruck- transmitter Stellantrieb Fabrikat


Easylabregler


Statisch



Elab

RS, RE, PC, C

TCU3


Integriert

Schnelllaufender Stellantrieb


Elab

RS, PC, C

TCU3


Integriert

Schnelllaufender Stellantrieb


Elab

RE, PC, C

TCU3


Integriert

Schnelllaufender Stellantrieb


Elab

RS, RE, PC, FH, C

TCU3


Integriert

Schnelllaufender Stellantrieb




Elektronischer Regler


Statisch

Elektronischer Regler


TMA

RS, RE, PC

TCU-LON-II mit LonWorks-Schnittstelle


Integriert

Schnelllaufender Stellantrieb


TMB

RS, RE, PC

TCU-LON-II mit LonWorks-Schnittstelle


Integriert

Schnelllaufender Stellantrieb (bürstenloser Motor)


TMA

RS, RE,

TCU-LON-II mit LonWorks-Schnittstelle


Integriert

Schnelllaufender Stellantrieb


TMB

RS, RE,

TCU-LON-II mit LonWorks-Schnittstelle


Integriert

Schnelllaufender Stellantrieb (bürstenloser Motor)


TMA

RE ,PC

TCU-LON-II mit LonWorks-Schnittstelle


Integriert

Schnelllaufender Stellantrieb


TMB

RE ,PC

TCU-LON-II mit LonWorks-Schnittstelle


Integriert

Schnelllaufender Stellantrieb (bürstenloser Motor)


TMA

RS, RE ,PC, FH

TCU-LON-II mit LonWorks-Schnittstelle


Integriert

Schnelllaufender Stellantrieb


TMB

RS, RE ,PC, FH

TCU-LON-II mit LonWorks-Schnittstelle


Integriert

Schnelllaufender Stellantrieb (bürstenloser Motor)


























































XF3

Δp



Integriert, 600 Pa

Federrücklaufantrieb

BB3

V



Separates Bauteil

Stellantrieb

① TROX, ② TROX/Belimo, ③ TROX/Gruner, ④ Sauter, ⑤ Siemens

☒ Bestellschlüsseldetail, V Volumenstrom, Δp Differenzdruck


VMRK

Nominal size
ØD
mm
L
mm
B3
mm
H3
mm
m
kg
125 125 394 195 145 2.0
160 160 394 230 180 2.2
200 200 394 270 220 2.5
250 250 594 320 270 3.5
315 315 594 385 335 5.1
400 400 594 470 420 6.9


VMRK-FL

Nominal size
ØD
mm
L
mm
B3
mm
H3
mm
ØD1
mm
ØD2
mm
n
T
mm
m
kg
125 125 400 195 145 165 185 8 8 2.2
160 160 400 230 180 200 230 8 8 2.6
200 200 400 270 220 240 270 8 8 3.0
250 250 600 320 270 290 320 12 8 4.4
315 315 600 385 335 350 395 12 10 6.1
400 400 600 470 420 445 475 16 10 8.2


Installation details, Commissioning, Basic information and nomenclature

  • Installation details
  • Commissioning
  • Basic information and nomenclature

Installation and commissioning

  • Installation orientation is relevant
  • Static differential pressure transducer: Check zero point and correct, if necessary

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

Attachments
Attachments mm

Without attachments

200

200

200

VARYCONTROL




Universal controller

300

320

300

LABCONTROL




EASYLAB

370

350

400


Space required

Nominal size
Nominal size mm

125 – 200

100

100

D

250 – 400

100

160

D

D: Casing diameter


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 V [m³/h]

Unit data

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

Principal dimensions

ØD [mm]

VAV terminal units made of stainless steel: Outer 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]

Outer 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]

Weight including attachments for the automatic differential pressure measurement

Nomenclature

Vnom [m³/h] and [l/s]

Nominal volume flow rate (100 %)

Vmin [m³/h] and [l/s]

Volume flow rate

ΔV [± %]

Volume flow rate accuracy

K value  [m³/h] and [l/s]

Unit-related constant for air density 1.2 kg/m³

Δpw [Pa]

Effective pressure

Δpst [%]

Static differential pressure in relation to the measured effective pressure

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Thank you for your message!

Visual contact Visual contact

Your message is send and will be processed shortly.
Our department for Service-Requests will contact you asap.
For general question regarding products or services you can also call:
Tel.: +43 1 250 43-0| Fax: +43 1 250 43 34