Dwyer Series 641RM Air Velocity Transmitter with Remote Probe

The Dwyer SERIES 641RM features the same highly accurate heated mass flow sensor as the Series 641, with a remote probe construction. The units 6´ cable which connects the sensing probe with the electronic enclosure allows the enclosure to be mounted where it can be more easily accessed.

Product Applications

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

Service : Clean air and compatible, non-combustible gases.

Accuracy : 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).

Response Time : Flow: 1.5 s to 95% of final value (output filter set to min.).

Temperature Limits : Process: -40 to 212°F (-40 to 100°C).

Ambient : 32 to 140°F (0 to 60°C).

Pressure Limit : 100 psi (6.89 bar) maximum.

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.

Mounting Orientation : Unit not position sensitive. Probe must be aligned with airflow.

Weight : 13.2 oz (374.26 g).

Cable Length : 6′ (1.82 m).

Probe Length : 12″ (30.48 cm) standard.

Probe Diameter : 5/16″ (0.79 cm).

OPTIONAL DISPLAY VERSION:

Display : 4-1/2 digit 1/2″ red LED.

Resolution : 1 FPM, 0.01 MPS (10 FPM @ 10,000 and 15,000 FPM ranges).

Weight : 13.9 oz (394.16 g).

  • Ranges from 250 FPM (1.25 MPS) to 15,000 FPM (75 MPS)
  • Optional bright LED display
  • Easy push button set-up
  • Compact housing
  • 4 to 20 mA output
  • Digital filter for signal damping

Manuals: 641RM
Catalog Pages: Series 641RM Catalog Page

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