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Series 641 Air Velocity Transmitter

Brand: Dwyer Instruments, LLC

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The SERIES 641 Air Velocity Transmitter is the ideal instrument for monitoring air flow.

This transmitter uses a heated mass flow sensor which allows for precise velocity measurements at various flow rates and temperatures.

The 641's 16 field-selectable ranges provides it the versatility to be selected for several air flow applications. The optional LED produces a complete, low-cost solution for local indication of air flow.
Features
  • Ranges from 250 FPM (1.25 MPS) to 15,000 FPM (75 MPS)
  • Optional Bright LED Display
  • Easy Push Button Set-up
  • Compact Housing
  • 4 to 20 mA Output
  • Digital Filter for Signal Damping
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The SERIES 641 Air Velocity Transmitter is the ideal instrument for monitoring air flow.

This transmitter uses a heated mass flow sensor which allows for precise velocity measurements at various flow rates and temperatures.

The 641's 16 field-selectable ranges provides it the versatility to be selected for several air flow applications. The optional LED produces a complete, low-cost solution for local indication of air flow.
Features
  • Ranges from 250 FPM (1.25 MPS) to 15,000 FPM (75 MPS)
  • Optional Bright LED Display
  • Easy Push Button Set-up
  • Compact Housing
  • 4 to 20 mA Output
  • Digital Filter for Signal Damping

Specifications

Accuracy

  • 3 % of Full Scale Process Gas: 0° to 50° C (32° to 122° F)
  • 4 % of Full Scale Process Gas: -40° to 0° C & 50° to 100° C (-40° to 32° F & 122° to 212° F)

Ambient Temperature Range

  • 0° to 60° C (32° to 140° F)

Approvals & Certifications

  • CE

Consumption

  • 300 mA - Max.

Display

  • 4-1/2-Digit, 1/2” Red LED

Electrical Connectors

  • Screw Terminal

Environmental Protection

  • IP66
  • NEMA 4X

Flow Rate

  • 250 to 15,000 fpm (1.25 to 75 mps)

Loop Resistance

  • 600 ohms, Max.

Media

  • Clean Air & Compatible
  • Non-Combustible Gases

Mounting

  • Duct Mount

NACE & NIST

  • NIST Traceable Calibration Certificate

NPT Connection

  • 1/2” NPT Female
  • 1/2” NPT Male

Output

  • 4-20 mA, Isolated 24 V Source, 3 or 4-Wire Connection

Power Requirement

  • 10-16 Vac
  • 12-35 Vdc

Process Temperature

  • -40° to 100° C (-40° to 212° F)

Response Time

  • 0.5 to 15 seconds
  • 1.5 seconds

Sensor / Probe Diameter

  • 6” to 24”

Supply Pressure

  • psi: 100 (kPa: 689.5, bar: 7)

Typical Applications

  • Exhaust stack flow monitoring
  • Air control in drying processes
  • HVAC air velocity measurements
  • Fan supply and exhaust tracking
  • Clean room fresh air supply
  • Ensure proper lab hood exhaust flow rates