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Documents: 641-18

Instruction Manual Series 641 Catalog Page 641 More Info

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

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

Brand: DwyerSKU: 641-18

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Overview Details for 641-18

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Air velocity transmitter | 18" (457.2 mm) probe length.

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).