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VFI/VFIT2 Vortex Flow sensor

The VFI flow transmitter from Direct Sensors is designed for industrial applications. The transmitter is based on the principle of vortex shedding behind a bluff body.

  • Description
  • Specification
  • DESCRIPTION

    The VFI flow transmitter from Direct Sensors is designed for industrial applications. The transmitter is based on the principle of vortex shedding behind a bluff body. The VFI transmitter is fully compatible with wet, aggressive liquids. The transmitter is based on MEMS sensing technology in combination with the corrosion-resistant Silicoat coating technology on the transmitter chip.

    for pump integration and monitoring in harsh environments. The transmitter is supplied with a stainless steel flow pipe, available with flanges or in a threaded version.

     

    Applications

    • Pump control
    • HVAC systems
    • temperature control and chiller systems
    • renewable energies such as heat pumps, solar thermals, fresh water and micro-CHP systems
    • monitoring and control systems
    • water treatment plants
    • water utility and distribution systems
    • HPC (High-Performance Computing) and IT cooling systems.

     

    Features and benefits

    • Measurement principle with no movable parts, resulting in no wear and tear
    • MEMS technology
    • direct contact with the aqueous media resulting in a fast response time
    • plug and play for quick setup
    • smart system solution with Grundfos pump controls
    • compact and robust design
    • compatible with aqueous media
    • suitable for a wide temperature range
    • suitable for a wide range of application.
    • For aqueous media below 2 μS/cm contact your local Grundfos sensor representative.

     

    Directives
    The Direct Sensors are in conformity with these council directives on the approximation of the laws of the EC member states:

    • Low Voltage Directive (2014/35/EU): Standards used: EN 61010-1:2010
    • EMC Directive (2014/30/EU): Standards used: EN 61326-1:2013 and EN 61326-2-3:2013
  • SPECIFICATION

    Flow measuring range 0.3 - 6 m3/h (1.32 to 26.42 gpm)
    0.6 - 12 m3/h (2.64 to 52.83 gpm)
    1.3 - 25 m3/h (5.72 to 110.07 gpm)
    2-40 m3/h (8.81 to 176.11 gpm)
    3.2 - 64 m3/h (14.09 to 281.78 gpm)
    5.2 - 104 m3/h (22.89 - 457.89 gpm)
    8-160 m3/h (35.22 to 704.46 gpm)
    Flow Accuracy (± 1 σ) in water 0-100 °C (32-212 °F) ± 1.5 % FS
    12-240 m3/h (52.83 to 1056.69 gpm)
    Response time (63.2 %) Less than 1 s
    Resolution 0.0075 m3/h (0.03 gpm)
    0.015 m3/h (0.07 gpm)
    0.031 m3/h (0.14 gpm)
    0.05 m3/h (0.22 gpm)
    0.08 m3/h (0.35 gpm)
    0.13 m3/h (0.57 gpm)
    0.2 m3/h (0.88 gpm)
    0.30 m3/h (1.32 gpm)
    Measuring range -10 - 120 °C (14-248 °F)
    Temperature, Accuracy (± 1 σ) 15-90 °C (59-194 °F) ± 0.5 K
    -10 - 120 °C (14-248 °F) ± 1 K
    Response time (63.2 % at 50 % FS flow) 250 ms
    Resolution 0.1 K
    Liquid types Aqueous media compatible with wetted materials. Kinematic viscosity less than or equal to 6 mm2/s (cSt). See appendix Pressure drop curves
    Maximum system pressure 30 bar (435 psig)
    Burst pressure 40 bar (580 psig)
    Liquid temperature, operation -30 to +110 °C (-22 to +230 °F),non-freezing
    Liquid temperature, peak -30 to +110 °C (-22 to +230 °F),non-freezing
    Ambient temperature, operation -25 to +60 °C (-13 to +140 °F)
    Ambient temperature, peak -55 to +70 °C (-67 to +158 °F)
    Storage temperature -55 to +70 °C (-67 to +158 °F)
    Humidity, relative 0-95 %, non-condensing
    Power supply 12.5 - 30 VDC (VFI)
    16.6 - 30 VDC (VFI+T)
    Output signals 4-20 mA (VFI)
    0-10 VDC (-10 °C at 0 V, 120 °C at 10 V) (VFI+T)
    Signal cut off 21 mA (VFI)
    11 VDC (VFI+T)
    Maximum power consumption 660 mW (VFI)
    270 mW (VFI+T)
    Maximum load impedance 60 Ω at 12.5 VDC (VFI)
    100 Ω at 13.3 VDC (VFI)
    600 Ω at 24 VDC (VFI)
    900 Ω at 30 VDC (VFI)
    10 kΩ (VFI+T)
    Maximum cable length 30 m (98 ft)
    Sensing element Silicon-based MEMS
    O-ring EPDM or FKM
    Housing Stainless steel 1.4404 (AISI 316 L)
    Flow pipe Stainless steel 1.4408 (AISI 316)
    Flange. no liquid contact Cast iron or stainless steel
    Bluff body Stainless steel 1.4401 (AISI 316 L)
    Wetted materials Corrosion-resistant coating, EPDM or FKM, Stainless steel 1.4401/04/08 (AISI 316 L)
    Enclosure class IP67, cable connected
    Temperature cycling IEC 68-2-14
    Vibration, non-destructive 20-2000 Hz, 10G, 4 h
    Electromagnetic compatibility EN 61326-1
    with cast iron flanges, cable etc 6.4 kg (14.1 lbs)
    6.5 kg (14.3 lbs)
    7.4 kg (16.3 lbs)
    9.4 kg (20.7 lbs)
    11.5 kg (25.3 lbs)
    13.2 kg (29.0 lbs)
    18.1 kg (39.8 lbs)
    with stainless steel flanges, cable etc 5.2 kg (12.1 lbs)
    5.6 kg (12.3 lbs)
    6.5 kg (14.3 lbs)
    8.2 kg (18.0 lbs)
    11.9 kg (26.2 lbs)
    13.7 kg (30.1 lbs)
    18.1 kg (39.8 lbs)
    with thread, unions, fittings, cable etc 3.4 kg (7.5 lbs)
    3.6 kg (7.9 lbs)
    Certificates CE - C, CSA, US - EAC

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