Air Flow Sensor for HVAC

The EE650 air flow sensor is dedicated for accurate and reliable measurement in building automation and ventilation applications.

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EE650 employs the new VTQ air flow sensor element, which operates on the thermal anemometer principle and is manufactured by E+E in state-of-the-art thin film technology.

Due to its innovative design, the VTQ air flow sensor element is very robust and highly insensitive to pollution, which leads to outstanding long-term performance. 

The measured data is available either on an analogue voltage or current output, user selectable, or on the RS485 interface with Modbus RTU or BACnet MS/TP protocol.

The enclosure design and the mounting flange included in the scope of supply allow for easy installation or replacement. The configuration and adjustment of the EE650 can be comfortably performed on the electronics board or via digital interface.

Typical Applications

  • HVAC
  • Ventilation systems
  • Process control

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Key Features EE650

  • Best accuracy and long term stability
  • High resistance to pollution and mechanical stress
  • Measuring range 0.2 - 10/15/20 m/s (40 - 2000/3000/4000 ft/min), user selectable
  • Current and voltage outputs, selectable 
  • RS485 interface with Modbus RTU or BACnet MS/TP
  • Duct mount and remote probe versions
  • Easy installation
  • Digital interface for adjustment by user

Technical data EE650

  • 0...10 m/s (0...2000 ft/min)
    0...15 m/s (0...3000 ft/min)
    0...20 m/s (0...4000 ft/min)

    Measuring range - user selectable
  • 0.2...10 m/s ±(0.2 m/s + 3 % of mv)
    0.2...15 m/s ±(0.2 m/s + 3 % of mv)
    0.2...20 m/s ±(0.2 m/s + 3 % of mv)

    Accuracy at 20 °C (68 °F), 45 % RH, 1013 hectopascal
  • typ. 4 sec or typ. 1 sec.

    Response time - user selectable
  • 0-10 V and 4-20 mA

    Output Analogue
  • Modbus RTU or BACnet MS/TP

    Output Digital
  • 24 V AC/DC


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  • What is the difference between Modbus RTU and Modbus TCP/IP?

    The main difference is the hardware interface. The Modbus RTU protocol runs on RS485 Hardware while Modbus TCP/IP protocol on Ethernet hardware.

  • What is the difference between a BTL listed and a non-listed BACnet product.

    All BACnet products are tested at E+E. The BTL listed E+E products have been additionally tested by the BACnet Testing Laboratories.

  • How can I clean the air velocity sensing element?

    Due to its design and materials, the E+E thin film sensing element for air velocity is highly insensitive to pollution. When operaten in very dusty or diry environment, cleaning might be necessary. See section maintenance at

  • How can I replace the air velocity sensing element or the air velocity sensing probe?

    This is not possible. Return the device to E+E for service.

  • What kind of calibration certificate is included in the standard scope of supply of the E+E air velocity sensors?

    The standard scope of supply of E+E air velocity sensors includes an inspection certificate according DIN EN 10204 - 2.2 or DIN EN 10204 - 3.1, depending on the model. Please see the product data sheet and operation manual for the type of certificate. For details on calibration certificates please see page 5 in

  • Can E+E supply an accredited calibration certificate with the air velocity sensor?

    Accredited calibration certificate for air velocity is available upon request, please see our calibration website

  • How I can readjust my E+E air velocity sensor?

    For readjusting the air velocity sensor you need first of all a reliable reference. This would be a wind channel. For the readjustment procedure please see the operation manual of the specific E+E air velocity sensor available at

    In case an approriate air velocity reference in not available, please return the device to E+E for service.

  • What is the difference between a 2 wire and a 3 wire current output?

    Transmitter with "two-wires" technology receive the power from the process, and the signal is carry on return wire (closed current loop). With technology "three-wires" the power supply is separate from current output: 2 wires are the power supply and third carry the signal.

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