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Series
641B

Air Velocity Transmitter
8 Field Selectable Ranges in FPM or MPS

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 seconds to 95% of final value (output filter set to minimum).
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: 12-35 VDC, 10-16 VAC.
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.
Enclosure Rating: Designed to meet NEMA 4X (IP66).
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.

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