Air velocity transmitter: Series 641 RM DWYER

For Remotely Mounting Electronic Enclosure

Application

  • Exhaust stack flow monitoring
  • Air control in drying processes
  • HVAC air velocity measurements
  • Fan supply and exhaust tracking
641RM_641B_Catalog 641RM_iom +(84) 839 606 568

The SERIES 641RM features the same highly accurate heated mass flow sensor as the Series 641, with a remote probe construction.

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Specification

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 seconds to 95% of final value (output filter set to minimum).
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 LimitNon-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 (seconds).
Loop Resistance:600 Ω max.
Current Consumption:300 mA max.
Electrical Connections:Screw terminal.
Process Connections:1/2" male NPT.
Enclosure Rating:Designed to meet NEMA 4X (IP66) for non LED models only.
Mounting Orientation:Unit not position sensitive. Probe must be aligned with airflow.
Weight:13.2 oz (374.26 g).
Cable Length:6 ft (1.82 m).
Probe Length:12" (30.48 cm) standard.
Probe Diameter:5/16" (0.79 cm).
Agency Approvals:CE.
     
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).
       

Feature

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

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