Type VMLK

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

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

  • Permanent volume flow rate measuring
  • Recording of measured values and use for slave controllers
  • For combination with LABCONTROL control components
  • Volume flow rate control for fume cupboards by signalling to frequency converters
  • Measurement accuracy ± 5 % even with unfavourable upstream conditions
  • 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 VMLK, with nozzle and flange 00136353_0


  • Application
  • Description

Application

  • Circular LABCONTROL volume flow rate measuring units Type VMLK for the automatic measurement of volume flow rates from fume cupboards and fume hoods
  • Suitable for contaminated air
  • Volume flow rate control for fume cupboards by signalling to frequency converters
  • Simplified commissioning, approval and maintenance
  • Suitable for permanent installation because of low differential pressure

Special features

  • High measurement accuracy with any upstream conditions
  • Effective pressure range: approx. 5 – 250 Pa

Nominal sizes

  • Bluff body: 250 – 100, 250 – 160
  • Nozzle: 250 – D08, 250 – D10, 250 – D16
  • Bluff body available in two sizes and nozzle available in three sizes for different volume flow rate ranges

Variants

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

Parts and characteristics

  • Ready-to-commission unit which consists of mechanical parts and control components.
  • Averaging differential pressure sensor for volume flow rate measurement; can be removed for cleaning
  • Factory-assembled control component complete with tubing

Attachments

  • LABCONTROL: Control 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
  • Short casing: 392 mm without flange, 400 mm with flange

Materials and surfaces

  • Casing made of flame-resistant polypropylene (PP), flame retardant (V-0) to UL 94
  • Differential pressure sensor (with bluff body, or nozzle) and plain bearing 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)

Technische Information

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

  • Function
  • Technical data
  • Specification text
  • Order code
Schematic illustration of the VMLK 00135859_0
① Flange
② Casing
③ Sticker showing the correct installation orientation
④ Control equipment
⑤ Sensor head
⑥ Effective pressure sensor
⑦ Bluff body


Functional description

The measuring unit is fitted either with a bluff body and a differential pressure sensor or with a nozzle.

The control components (attachments) include a differential pressure transducer that transforms the differential pressure (effective pressure) into an electric signal, and a controller.

  • Fume cupboard control: The volume flow rate setpoint depends on the control strategy for the fume cupboard control and is based on the face velocity, the sash position, or a constant value.
  • Volume flow control: The volume flow rate setpoint comes from an external unit or device.

The controller compares the actual value with the setpoint value and alters the control signal of the frequency converter or of the actuator if there is a difference between the two values.

Nominal sizes

250 mm

Volume flow rate range

30 – 515 l/s or 108 – 1854 m³/h

Measurement accuracy

± 5 % of the measured value

Effective pressure range

approx. 5 – 250 Pa

Measuring unit differential pressure (pressure loss)

19 – 65 % of the measured effective pressure

Operating temperature

10 – 50 °C




Circular volume flow rate measuring unit made of flame-resistant plastic for the measurement of volume flow rates in variable air volume systems and fume cupboards. Suitable for the permanent monitoring of the volume flow rate (actual value signal) of extract air containing aggressive media since all components coming into contact with the airflow are made of plastic (no interior metal parts). Measurement accuracy ± 5 % even with unfavourable upstream and downstream conditions. Suitable also for volume flow rate control by signalling to frequency converters.

Ready-to-commission unit which consists of the casing with either averaging effective pressure sensor and bluff body or with nozzle, and an electronic controller.

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

Spigot, suitable for ducts according to DIN 8077.

Casing air leakage to EN 15727, class C.

Special features

  • High measurement accuracy with any upstream conditions
  • Effective pressure range: approx. 5 – 250 Pa

Materials and surfaces

  • Casing made of flame-resistant polypropylene (PP), flame retardant (V-0) to UL 94
  • Differential pressure sensor (with bluff body, or nozzle) and plain bearing made of polypropylene (PP)

Technical data

  • Nominal sizes: 250 mm
  • Volume flow rate range: 30 to 515 l/s or 108 to 1854 m³/h
  • Measurement accuracy ± 5 % even with unfavourable upstream and downstream conditions.
  • Effective pressure range: approx. 5 – 250 Pa
  • Measuring unit differential pressure (pressure loss): 19 – 65 % of the measured effective pressure
  • Operating temperature: 10 to 50 °C

Attachments

Volume flow rate control with electronic EASYLAB controller for fume cupboards.

  • Supply voltage 24 V AC
  • Static differential pressure measurement
  • Easy commissioning due to plug and play communication system
  • Controller is a modular system and can be expanded
  • Volume flow rate monitoring

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

VMLK/.../ELAB/FH-*

  • VMR 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: VMLK/250-D08/ELAB/EC-E0

Nominal size

250 with nozzle D08

Attachment

EASYLAB controller

Equipment function

Single controller, extract air

Voltage signal

0 – 10 V DC


VMLK-FL/250–100/GK/ELAB/FH-F/250 m³/h

Flange

Both ends

Nominal size

250 with bluff body 100

Attachment

EASYLAB controller

Equipment function

Fume cupboard control with volume flow rate constant value for signalling to the frequency converter

Volume flow rate

250 m³/h


 

Variants, Attachments, Dimensions and weight

  • Variants
  • Attachments
  • Dimensions and weight

VMLK

Application

  • Plastic circular volume flow rate measuring units for volume flow rate measurement
  • Spigot to make connections to the ducting

VMLK-FL

Application

  • Plastic circular volume flow rate measuring units for volume flow rate measurement
  • With flanges on both ends to make detachable connections to the ducting

VMLK, 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 LVC TVR TVJ TVT TZ-S TA-S TVZ TVA TVM TVRK TVLK





















Easyregler


Dynamisch















Easy

V



Integriert

Integriert







Compactregler


Dynamisch















BC0

V

MP-Bus


Integriert

Integriert





BF0

V

MP-Bus


Integriert

Integriert












BL0

V

LonWorks


Integriert

Integriert






BM0

V

Modbus


Integriert

Integriert













BM0-J6

V

Modbus und steckerfertiger Anschlussleitung


Integriert

Integriert













XG0

V



Integriert

Integriert












XB0

V



Integriert

Integriert






LN0

V



Integriert

Integriert






LK0

V

KNX
















LY0

V



Integriert

Integriert














Compactregler


Statisch















SA0

V



Integriert

Integriert













SC0

Δp



Integriert

Schnelllaufender Stellantrieb integriert















Universalregler


Dynamisch















B11

V



Integriert

Stellantrieb, Drehmoment für TVT












B13

V



Integriert

Stellantrieb







B27

V



Integriert

Stellantrieb












B1B

V



Integriert

Federrücklaufantrieb






XC3

V



Integriert

Federrücklaufantrieb








Universalregler


Statisch















BP1

V

MP-Bus


Separates Bauteil

Stellantrieb, Drehmoment für TVT












BP3

V

MP-Bus


Separates Bauteil

Stellantrieb





BPB

V

MP-Bus


Separates Bauteil

Federrücklaufantrieb





BPG

V

MP-Bus


Separates Bauteil

Schnelllaufender Stellantrieb




BB1

V



Separates Bauteil

Stellantrieb, Drehmoment für TVT












BB3

V



Separates Bauteil

Stellantrieb





BBB

V



Separates Bauteil

Federrücklaufantrieb






XD1

V



Integriert

Stellantrieb





XD3

V



Integriert

Federrücklaufantrieb





BR1

Δp

MP-Bus


100 Pa

Stellantrieb, Drehmoment für TVT












BR3

Δp

MP-Bus


100 Pa

Stellantrieb






BRB

Δp

MP-Bus


100 Pa

Federrücklaufantrieb





BRG

Δp

MP-Bus


100 Pa

Schnelllaufender Stellantrieb







BS1

Δp

MP-Bus


600 Pa

Stellantrieb, Drehmoment für TVT












BS3

Δp

MP-Bus


600 Pa

Stellantrieb









BSB

Δp

MP-Bus


600 Pa

Federrücklaufantrieb









BSG

Δp

MP-Bus


600 Pa

Schnelllaufender Stellantrieb









BG1

Δp



100 Pa

Stellantrieb, Drehmoment für TVT












BG3

Δp



100 Pa

Stellantrieb






BGB

Δp



100 Pa

Federrücklaufantrieb





BH1

Δp



600 Pa

Stellantrieb, Drehmoment für TVT












BH3

Δp



600 Pa

Stellantrieb










BHB

Δp



600 Pa

Federrücklaufantrieb









XE1

Δp



Integriert, 100 Pa

Stellantrieb





XE3

Δp



Integriert, 100 Pa

Federrücklaufantrieb





XF1

Δp



Integriert, 600 Pa

Stellantrieb









XF3

Δp



Integriert, 600 Pa

Federrücklaufantrieb









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

☒ Bestellschlüsseldetail, V Volumenstrom, Δp Differenzdruck


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


VMLK

Nominal size
250 – 100, 250 – 160
m
kg
250 – D08, 250 – D10, 250 – D16
m
kg
250 2.1 2.6


VMLK-FL

Nominal size
250 – 100, 250 – 160
m
kg
250 – D10, 250 – D16, 250 – D08
m
kg
250 2.6 3.1


Installation details, Commissioning, Basic information and nomenclature

  • Installation details
  • Commissioning
  • Basic information and nomenclature

Installation and commissioning

  • Installation orientation is relevant
  • For any upstream and downstream conditions
  • 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

250-1** Bluff body

100

160

D

250-D** Nozzle

100

160

100

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

  • VMLK/250 to 100
  • Δpw = 100 Pa (manometer reading of effective pressure)
  • Volume flow rate V [m³/h]

Unit data

  • K value from table:K = 90

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

Condividi pagina

Consiglia questa pagina

Consiglia questa pagina inviando un link via e-mail.

I campi contrassegnati con (*) sono obbligatori.

Condividi pagina

Grazie per la tua condivisione!

La tua segnalazione è stata inviata e dovrebbe arrivare a breve.


Contatti

Siamo qui per te

Visual contact Visual contact

Specifichi il suo messaggio ed il tipo di richiesta
Tel.: +39 029829741 | Fax: +39 0298297460

I campi contrassegnati con (*) sono obbligatori.

Contatti

Grazie per il tuo messaggio!

Visual contact Visual contact

Il tuo messaggio è stato inviato e sarà processato a breve.
Il nostro dipartimento per la gestione delle richieste ti contatterà appena possibile.
Per domande di carattere generale riguardanti i nostri prodotti o servizi, è possibile contattare:
Tel.: +39 029829741 | Fax: +39 029829760

Contatti

Siamo qui per te

Visual contact Visual contact

Specifichi il suo messaggio ed il tipo di richiesta
Tel.: +39 029829741 | Fax: +39 0298297460

Attachment (max. 10MB)

I campi contrassegnati con (*) sono obbligatori.

Contatti

Grazie per il tuo messaggio!

Visual contact Visual contact

Il tuo messaggio è stato inviato e sarà processato a breve.
Il nostro dipartimento per la gestione delle richieste ti contatterà appena possibile.
Per domande di carattere generale riguardanti i nostri prodotti o servizi, è possibile contattare:
Tel.: +39 029829741 | Fax: +39 029829760