VMLK

Volume flow rate measuring unit, variant VMLK, with nozzle and flange

Variant with bluff body and flange

Variant with nozzle and connecting circular spigot

Easy cleaning of sensor tubes

Tested to VDI 6022

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

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

Description

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 beremoved 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)

Technical information

Schematic illustration of the VMLK

① Flange

② Casing

③ Sticker showing the correct installation orientation

④ Control equipment

⑤ Sensor head

⑥ Effective pressure sensor

⑦ Bluff body

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.

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]

VMLK with EASYLAB for the recording of measured values

1 Type

VMLK Volume flow rate measuring unit, plastic

2 Flange

No entry: none
FL Flanges on both ends

3 Nominal size [mm]

250 – 100 Bluff body 100
250 – 160 Bluff body 160
250 – D08 Nozzle D08
250 – D10 Nozzle D10
250 – D16 Nozzle D16

4 Accessories

No entry: none
GK Matching flanges for both ends

5 Attachments

ELAB EASYLAB TCU3

6 Equipment function

EC Extract air recording

7 Voltage range for the actual value signal

E0 Voltage signal 0 – 10 V DC
E2 Voltage signal 2 – 10 V DC

8 Module expansion

Option 1: Power supply
No entry: 24 V AC

T EM-TRF for 230 V AC
U EM-TRF-USV for 230 V AC, provides uninterruptible power supply (UPS)

Option 2: Communication interface
No entry: none

L EM-LON for LonWorks FTT-10A
B EM-BAC-MOD-01 for BACnet MS/TP
M EM-BAC-MOD-01 for Modbus RTU
I EM-IP for BACnet/IP, Modbus/IP and webserver
R EM-IP with real time clock

Option 3: Automatic zero point correction
No entry: none

Z EM-AUTOZERO Solenoid valve for automatic zero point correction

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 with EASYLAB for fume cupboard control with external signalling (frequency converter)

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)

Volume flow rate measuring unit, variant VMLK, with bluff body and circular spigot

Volume flow rate measuring unit,
variant VMLK, with bluff body and flange

Volume flow rate measuring unit,
variant VMLK, with nozzle and circular spigot

VMLK

Application

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

VMR-FL

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

VMLK

Downloads

product information

certificates

Certificate concerning statistical leakage tests

LC_v1_2024_10_DE_en Certificate 660 KB pdf
Certificate Statement Type VMLK

Certificate 130 KB pdf
Declaration of hygiene conformity VMLK

VMLK_HC_2024_05_DE_en Hygiene certificate 2,1 MB pdf
Non-CE Manufacturer's statement VMLK

VMLK_NotCE_2022_02_08_14_44_03_DE_en Certificate 2,1 MB pdf

operation manuals

Assembly and operating instructions VMLK

VMLK_IOM_CD10030_V2_2024_01_GB_en Assembly and operating instructions 2,2 MB pdf

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FOR THE MEASUREMENT OF VOLUME FLOW RATES IN DUCTS WITH CONTAMINATED AIR FROM LABORATORIES

Application

Description

Technical information

Downloads

product information

certificates

Certificate concerning statistical leakage tests

Certificate Statement Type VMLK

Declaration of hygiene conformity VMLK

Non-CE Manufacturer's statement VMLK

operation manuals

Assembly and operating instructions VMLK

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