air velocity transmitter
air velocity transmitter

Dwyer 641RM-12 Series Air Velocity Transmitter

Dwyer 641RM-12 Series Air Velocity Transmitter with Cable 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.

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The Series 641RM 16 field selectable ranges from 0-250 to 15,000 FPM (0-1.25 to 75 MPS) provide it the versatility to be selected for a multitude of applications. The unit’s 6’ cable which connects the sensing probe with the electronic enclosure allows the enclosure to be mounted where it can be more easily accessed. Longer cable lengths are available for ducts that are at very high elevations from the plant floor. The optional LED produces a complete, compact solution for local indication of air flow.

50 Items

Data sheet

0-250 to 15,000 FPM (0-1.25 to 75 MPS)
3% FS process gas: 32 to 122°F (0 to 50°C); 4% FS process gas: -40 to 32°F & 122 to 212°F (-40 to 0°C & 50 to 100°C).
4-20 mA, isolated 24V source, 3 or 4-wire connection
Electrical Connection
Screw terminal.
Temperature Limits
Process: -40 to 212°F (-40 to 100°C); Ambient: 32 to 140°F (0 to 60°C).
Unit not position sensitive. Probe must be aligned with airflow.
Response Time
Flow: 1.5 seconds to 95% of final value (output filter set to minimum).
Probe:12˝ (30.48 cm) standard.
Cable Length
6 ft (1.82 m).
Loop Resistance
600 ohms max.
374.26 g

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