641-18-LED    | Air velocity transmitter | 18" (457.2 mm) probe length | with LED display.  |   Dwyer
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Brand: DwyerSKU: 641-18-LED

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641-18-LED | Air velocity transmitter | 18" (457.2 mm) probe length | with LED display. | Dwyer

Air velocity transmitter, 18" (457.2 mm) probe length, with LED display.

Dwyer | 641-18-LED
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Air velocity transmitter | 18" (457.2 mm) probe length | with LED display.

Series 641 Air Velocity Transmitter

High Accuracy, Field Selectable Ranges

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.

NIST CALIBRATION available in Product Configurator.

Product 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
  • 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

Series
641 Air Velocity Transmitter
Category/Type
Air Velocity
Type
Air Velocity Transmitter
Series
641 Air Velocity Transmitter
Service
Clean air and compatible; non-combustible gases.
Accuracy
3% FS Process gas: 32 to 122°F (0 to 50°C); 4% FS Process gas: -40 to 32°F & 122 to 212°F (-40 to 0°C & 50 to 100°C).
Response Time
Flow: 1.5 s to 95% of final value (output filter set to min.).
Temperature Limits
Process: -40 to 212°F (-40 to 100°C). Ambient: 32 to 140°F (0 to 60°C).
Pressure Limit
100 psi (6.89 bar) maximum.
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 s.
Loop Resistance
600 Ω max.
Current Consumption
300 mA max.
Electrical Connections
Screw terminal.
Process Connections
1/2" male NPT.
Enclosure Rating
Designed to meet NEMA 4X (IP66) for non LED models only.
Mounting Orientation
Unit not position sensitive. Probe must be aligned with airflow.
Weight
12.6 oz (357.2 g).
Agency Approvals
CE.
OPTIONAL DISPLAY VERSION
Display
4-1/2 digit 1/2" red LED.
Resolution
1 FPM; 0.01 MPS (10 FPM @ 10;000 and 15;000 FPM ranges).
Weight
13.3 oz (377 g).

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