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Series 641 Air Velocity Transmitter
Brand: Dwyer Instruments, LLCThe 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)
- 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
