Digital air velocity transmitter 641 series

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. 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 FEATURES 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 Service: Clean air and compatible, non-combustible gases. 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). Humidity Limit: Non-condensing. Output Filter: Selectable 0.5-15 s. Loop Resistance: 600 Ω max. Current Consumption: 300 mA max. Electrical Connections: Screw terminal.