Description
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 provide it the versatility to be selected for several air flow applications. The optional LED produces a complete, cost effective solution for local indication of air flow.
Applications:
- • Exhaust stack flow monitoring
- • HVAC air velocity measurements
- • Clean room fresh air supply
- • Air control in drying processes
- • Fan Supply and exhaust tracking
- • Ensuring proper lab hood exhaust flow rates
Specifications:
- 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).
- Range: 250 FPM (1.25 MPS) to 15,000 FPM (75 MPS).
- 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 ⦠max.
- Current Consumption: 300 mA max.
- Electrical Connections: Screw terminal.
- Mounting Orientation: Unit not position sensitive. Probe must be aligned with airflow.
- Cable Length: 6'
- Probe Length: 12"
- Probe Diameter: 5/16"