Starting at $1,233.68CAD
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641B Air Velocity Transmitter

Low-cost, direct reading instrument to measure air velocity and static pressure in dirty air flow applications

Starting at
$1,233.68CAD
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641 B Air Velocity Transmitter 02334

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).

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

*A brief current transient exceeding 300 mA may be seen on startup
ServiceAir and compatible, non-combustible gases
Accuracy5% FS process gas: 32°F - 122°F (0°C - 50°C);
6% FS process gas: -40°F - 32°F and 122°F - 212°F (-40°C - 0°C and 50°C - 100°C)
Response TimeFlow: 1.5 s to 95% of final value (output filter set to minimum)
Temperature LimitsProcess: -40°F - 176°F (-40°C - 80°C)
Ambient: 32°F - 140°F (0°C - 60°C)
Humidity LimitNon-condensing
Power Requirements12 VDC - 35 VDC, 10 VAC - 16 VAC. 1.5 A rating required on supply due to initial power surge drawn by transmitter
Output Signal4 - 20 mA, isolated 24 V source, 3 or 4-wire connection
Output FilterSelectable 0.5 s - 15 s
Loop Resistance600 Ω max
Current Consumption300 mA max*
Electrical ConnectionsScrew terminal
Enclosure RatingDesigned to meet NEMA 4X (IP66)
Mounting OrientationUnit not position sensitive
Weight12.6 oz (357.2 g)

• Exhaust stack flow monitoring
• Air control in drying processes
• HVAC air velocity measurements
• Fan supply and exhaust tracking
• Clean room ventilation monitoring

  • Thumbnail of document Manual - 641B Air Velocity Transmitter
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    Manual - 641B Air Velocity Transmitter

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  • Thumbnail of document Data Sheet - 641B Air Velocity Transmitter
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    Data Sheet - 641B Air Velocity Transmitter

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