Flow sensors

Special sensors to complement the range

Xtra sensors visual

Be it the flow of liquids or the flow of air, Symaro offers everything needed to ensure accurate flow measurements – from flow sensors to flow switches and velocity sensors. Since all types of flow sensors are available with DC 0...10 V
or 4...20 mA outputs, the products are very versatile.

Highlights at a glance

  • Supports energy-efficient control – by measuring solar irradiation

  • Point measurement of air velocity or the volumetric flow in air ducts

  • Increased security – thanks to flow monitoring in HVAC plants and hydraulic systems


QVM62.1 – air velocity sensor

Air velocity sensor

This sensor is used to control the air velocity to a constant value, or to balance out pressure fluctuations (supply or extract air control), or to monitor the flow in air ducts. It primarily is used for modulating fan control in primary plants to set the basic volume flow.

Range of use:

  • Range: 0...15 m/s

  • Supply: AC/DC 24V

  • Output: DC 0...10 V oder 4...20 mA

  • Protection class: IP42

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QVE1900 – flow switch

Flow switch

The QVE1900 is used in HVAC plants to monitor the flow of fluids in hydraulic systems, especially in refrigeration, heat pump and heating plants, e.g. for use with condensers, boilers, heat exchangers.

Range of use:

  • Pipes: DN 1.25…8“

  • Contact rating: 15 A / AC 24...250 V

  • Output: Relay

  • Protection class: IP65

Link to more information:


QVE1901 – flow switch

Flow switch

The QVE1901 sensor is used to monitor the flow of liquid medium in HVAC plants in hydraulic systems, in particular, refrigeration, heat pump and heating plants, e.g. for evaporators, boilers, heat exchangers, etc.

Range of use:

  • Pipes: DN 0.75…8“

  • Contact rating: 1 A / AC 230 V / 26 VA 1 A / DC 48 V / 20 W

  • Output: Relay

  • Protection class: IP65

Link to more information:


QVE1902 – flow sensor

xtra sensors QVE1902

In HVAC plants to monitor the flow of liquid medium in hydraulic systems, in particular, refrigeration, heat pump and heating plants, e.g. for evaporators, boilers, heat exchangers, etc.

Range of use:

  • Pipes: DN10…25

  • Contact rating: 1 A / AC 230 V / 26 VA; 1 A / DC 48 V /  
    20 W

  • Output: Relay

  • Protection class: IP65


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QVE2..00.. – flow sensor

xtra sensors QVE2000

The flow sensor is suited to continuously measure flow or monitor liquids such as hot water, heating water, or standard water-glycol mixes in HVAC plants and applications. The sensors can be used in automation and control systems as control sensor or measured value sensor.

Range of use:

  • Material: Fiber-glass-reinforced plastic

  • Range: 1.8…150 l/min

  • Supply: DC 18…33 V

  • Output: DC 0…10 V or 4…20 mA

  • Protection class: IP65


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QVE3..00.. – flow sensor

xtra sensors QVE3000

The flow sensor is suited to continuously measure flow or monitor liquids such as hot water, heating water, or standard water-glycol mixes in HVAC plants and applications. The sensors can be used in automation and control systems as control sensor or measured value sensor.

Range of use:

  • Material: red brass

  • Range: 1.8…150 l/min

  • Supply: DC 18…33 V

  • Output: DC 0…10 V or 4…20 mA

  • Protection class: IP65


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