Dwyer Omega – Series 641 Heated Mass Flow Air Velocity Transmitter ± 16 Ranges, NIST Options
Product Code: Series 641
Manufacturer: Dwyer Omega
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.
Accuracy
± 3 %
Accuracy Detail
3% FS process gas: 32 to 122°F (0 to 50°C); 4% FS process gas: -40 to 32°F and 122 to 212°F
Air Velocity, Max
15000 FPM
Air Velocity, Min
250 FPM
Compliance
CE
Electrical Connection
Screw Terminal
Electrical Output
4 to 20 mA
Filter
0.5 to 15 s (Selectable)
Loop Resistance
600 Ω max
Media Compatibility
Argon, Carbon dioxide, Clean Dry Air, Helium, Nitrogen, Non-Corrosive Dry Gases
Mounting Orientation
None
Number of Wires
4
Operating Temperature, Max
140 °F
Operating Temperature, Min
32 °F
Output Detail
4 to 20 mA, isolated 24 V source, 3 or 4-wire connection
Power Consumption
300 mA
Pressure Limits
Up to 100 psi
Process Connection Size
1/2 in
Process Connection Type
NPT Male
Process Temperature, Max
212 °F
Process Temperature, Min
-40 °F
Relative Humidity
Non-Condensing
Response Time
1.5 s to 95%
Response Time Note
Flow: 1.5 s to 95% of final value (output filter set to minimum)
Supply Power Note
12 to 35 Vdc, 10 to16 Vac. 1.5 A rating required on supply due to initial power surge drawn by transmitter
Supply Power Type
AC/DC
Supply Voltage
10 to 16 Vac, 12 to 35 Vdc
