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641B-4-LED | Air velocity transmitter with LED display. | Dwyer

Air velocity transmitter with LED display.

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Air velocity transmitter with LED display.

MODEL 641B AIR VELOCITY TRANSMITTER

Dirty Air Flow Applications

The Series 641B Air Velocity Transmitter uses a heated mass flow sensor suitablefor dirty air flow applications. It has user-selectable ranges from 250 FPM (1.25 MPS)to 2000 FPM (10 MPS).

Product Applications

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

SS sensor suitable for dirty air flow measurement
Ranges from 250 FPM (1.25 MPS) to 2000 FPM (10 MPS)
4 to 20 mA output
Digital filter for signal damping

Specifications

Service: Air and compatible; non-combustible gases.
Accuracy: 5% FS process gas: 32 to 122°F (0 to 50°C); 6% FS process gas: -40 to 32°F & 122 to 212°F (-40 to 0°C & 50 to 100°C).
Response Time: Flow: 1.5 s to 95% of final value (output filter set to min).
Temperature Limits: Process: -40 to 176°F (-40 to 80°C). Ambient: 32 to 140°F (0 to 60°C).
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 Ω max.
Current Consumption: 300 mA max*.
Electrical Connections: Screw terminal.
Enclosure Rating: Designed to meet NEMA 4X (IP66) for non-LED models only.
Mounting Orientation: Unit not position sensitive.
Weight: 12.6 oz (357.2 g).
: *A brief current transient exceeding 300 mA may be seen on startup.