SERIES 641 AIR VELOCITY TRANSMITTER

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.

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Feature:

  • 6″ probe length
  • Field selectable ranges from 250FPM (1.25m/s) to 15,000FPM (75m/s) suit any application
  • Easy push button set-up reduces installation time
  • Compact housing minimizes installation footprint
  • 4-20 mA output for use with most building management systems
  • Digital filter for signal damping
  • Selectable 0.5 to 15 (seconds) output filter
  • 1/2˝ male NPT process connection and screw terminal electrical connection
  • Maximum 300mA current consumption and 600 ohm loop resistance
  • Unit not position sensitive, probe must be aligned with airflow

Application:

  • 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

Specification

  • 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 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. 1.5 A 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 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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