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    Model 641B Air Velocity Transmitter

    Air Velocity Transmitter
    Dirty Air Flow Applications

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    Model 641B Air Velocity Transmitter

    Dirty Air Flow Applications

    The Model 641B Air Velocity Transmitter uses a heated mass flow sensor suitable for dirty air flow applications. It has user-selectable ranges from 250 FPM (1.25 MPS) to 2000 FPM (10 MPS).

    Product Applications

    • Exhaust stack flow monitoring
    • Air control in drying processes
    • HVAC air velocity measurements
    • Fan supply and exhaust tracking
    • Clean room ventilation monitoring
    Service:Air and compatible, non-combustible gases.
    Accuracy:5% FS process gas: 32 to 122°F (0 to 50°C); 6% FS process gas: -40 to 32°F & 122 to 212°F (-40 to 0°C & 50 to 100°C).
    Response Time:Flow: 1.5 seconds to 95% of final value (output filter set to minimum).
    Temperature Limits:Process: -40 to 176°F (-40 to 80°C). Ambient: 32 to 140°F (0 to 60°C).
    Humidity Limit:Non-condensing.
    Power Requirements:12 to 35 VDC, 10 to 16 VAC. 1.5 A rating required on supply due to initial power surge drawn by transmitter.
    Output Signal:4 to 20 mA, isolated 24 V source, 3 or 4-wire connection.
    Output Filter:Selectable 0.5-15 (seconds).
    Loop Resistance:600 Ω max.
    Current Consumption:300 mA max*.
    Electrical Connections:Screw terminal.
    Enclosure Rating:Designed to meet NEMA 4X (IP66).
    Mounting Orientation:Unit not position sensitive.
    Weight:12.6 oz (357.2 g).

    *A brief current transient exceeding 300 mA may be seen on startup.

    • SS sensor suitable for dirty air flow measurement
    • Ranges from 250 FPM (1.25 MPS) to 2000 FPM (10 MPS)
    • 4 to 20 mA output
    • Digital filter for signal damping