The Series 641RM Air Velocity Transmitter uses a heated mass flow sensor technology. It has 8 user selectable ranges from 250 FPM to 15000 FPM with corresponding metric ranges of 1.25 MPS to 75 MPS. The Series 641RM Air Velocity Transmitter provides an isolated 4-20 mA output proportional to the velocity. With the optional 1/2˝ 4-1/2 digit LED display, the Series 641RM Air Velocity Transmitter will provide a highly visible local readout of the velocity.

• Exhaust stack flow monitoring
• Air control in drying processes
• HVAC air velocity measurements
• Fan supply and exhaust tracking
• Clean room ventilation monitoring