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Series 641

Air Velocity Transmitter
16 Field Selectable Ranges in FPM or MPS
The new 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 to 15,000 FPM or 75 MPS
• Optional bright LED display
• Easy push button set-up
• Compact housing
• 4-20 mA output
• Digital filter for signal damping
APPLICATIONS
• Exhaust stack flow monitoring
• Air control in drying processes
• HVAC air velocity measurements
• Fan supply and exhaust tracking

ACCESSORIES
A-156, Universal Mounting Plate 1/2˝ female NPT
A-158, Split Flange Mounting Kit
A-159, Duct Mounting Gland
641-LED, Field-upgradeable LED

SPECIFICATIONS
Service:
Clean air and compatible, non-combustible gases.
Accuracy:
3% FS process gas: 32 to 122°F (0 to 50°C);
4% FS processgas: -40 to 32°F & 122 to 212°F (-40 to 0°C & 50 to 100°C).
Response Time: Flow: 1.5 seconds to 95% of final value (output filter set to minimum).
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: 12–35 VDC, 10–16 VAC. 1.5A rating required on supply due to initial power surge drawn by transmitter.
Output Signal: 4-20 mA, isolated 24V source, 3 or 4-wire connection.
Output Filter: Selectable 0.5 –15 (seconds).
Loop Resistance: 600 ohms 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 Approval: 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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Catalog: alt
Installation, Operation Manual:
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