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

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

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)

Technical information

  • 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 sizes250 mm
Volume flow rate range30 – 515 l/s or 108 – 1854 m³/h
Measurement accuracy± 5 % of the measured value
Effective pressure rangeapprox. 5 – 250 Pa
Measuring unit differential pressure (pressure loss)19 – 65 % of the measured effective pressure
Operating temperature10 – 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

00132124_0

 Type
VMLK       Volume flow rate measuring unit, plastic

 Flange
       No entry: none
FL       Flanges on both ends

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

 Accessories
       No entry: none
GK       Matching flanges for both ends

 Attachments (control component)
ELAB       EASYLAB controller TCU3

 

 Equipment function
       With face velocity transducer
FH-VS       Face velocity control
       With sash distance sensor
FH-DS       Linear control strategy
FH-DV       Safety-optimised control strategy
       With switching steps for on-site switch contacts
FH-2P       2 switching steps
FH-3P       3 switching steps
       Without signalling
FH-F       Volume flow rate constant value

 Expansion modules
       Option 1: Supply voltage
       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
       Option 4: Lighting
       No entry: none
S       EM-LIGHT Wired socket for the connection of lighting and for switching the lighting on/off using the control panel (only with EM-TRF or EM-TRF-USV)

 Operating values [m³/h or l/s]
       Depending on the equipment function
       VS: Vmin – Vmax
       DS: Vmin – Vmax
       DV: Vmin – Vmax
       2P: V1 / V2
       3P: V1 / V2 / V3
       F: V1

Useful additions
       Control panel for fume cupboard controller, for displaying the functions of the control system according to EN 14175
BE-SEG-** 2-character display
BE-LCD-01 40-character display

 

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Contact

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.: +49 (0)2845 / 202-0 | Fax: +49 (0)2845/202-265