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Instantly add the Series 641 Air Velocity Transmitter and 50,000+ more product series to your store or catalog  
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Dwyer Air Velocity Transmitter, Series 641

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

1 - 12 of 20 Part Numbers
641-12
641-12
DWYER Air Velocity Transmitter, 12" (304.8 mm) Probe Length.
  • Probe Length - 12" (304.8 mm)
  • LED Options - No LED
  • Certificates - None
641-12-LED
641-12-LED
DWYER Air Velocity Transmitter, 12" (304.8 mm) Probe Length, with LED Display.
  • Probe Length - 12" (304.8 mm)
  • LED Options - 4-1/2" Digit 1/2" Red LED
  • Certificates - None
641-12-LED-NIST
641-12-LED-NIST
  • Probe Length - 12" (304.8 mm)
  • LED Options - 4-1/2" Digit 1/2" Red LED
  • Certificates - NIST Traceable Calibration Certificate
641-12-NIST
641-12-NIST
  • Probe Length - 12" (304.8 mm)
  • LED Options - No LED
  • Certificates - NIST Traceable Calibration Certificate
641-18
641-18
DWYER Air Velocity Transmitter, 18" (457.2 mm) Probe Length.
  • Probe Length - 18" (457.2 mm)
  • LED Options - No LED
  • Certificates - None
641-18-LED
641-18-LED
DWYER Air Velocity Transmitter, 18" (457.2 mm) Probe Length, with LED Display.
  • Probe Length - 18" (457.2 mm)
  • LED Options - 4-1/2" Digit 1/2" Red LED
  • Certificates - None
641-18-LED-NIST
641-18-LED-NIST
  • Probe Length - 18" (457.2 mm)
  • LED Options - 4-1/2" Digit 1/2" Red LED
  • Certificates - NIST Traceable Calibration Certificate
641-18-NIST
641-18-NIST
  • Probe Length - 18" (457.2 mm)
  • LED Options - No LED
  • Certificates - NIST Traceable Calibration Certificate
641-24
641-24
DWYER Air Velocity Transmitter, 24" (609.6 mm) Probe Length.
  • Probe Length - 24" (609.6 mm)
  • LED Options - No LED
  • Certificates - None
641-24-LED
641-24-LED
DWYER Air Velocity Transmitter, 24" (609.6 mm) Probe Length, with LED Display.
  • Probe Length - 24" (609.6 mm)
  • LED Options - 4-1/2" Digit 1/2" Red LED
  • Certificates - None
641-24-LED-NIST
641-24-LED-NIST
  • Probe Length - 24" (609.6 mm)
  • LED Options - 4-1/2" Digit 1/2" Red LED
  • Certificates - NIST Traceable Calibration Certificate
641-24-NIST
641-24-NIST
  • Probe Length - 24" (609.6 mm)
  • LED Options - No LED
  • Certificates - NIST Traceable Calibration Certificate
1 - 12 of 20 Part Numbers

View_Details

Specifications

Brand

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)

  • 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

Documentation

Data Sheets

Approvals

Catalogs

Manuals

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