Series 641RM Air Velocity Transmitter with Remote Probe

Air Velocity Transmitter with Remote Probe

For Remotely Mounting Electronic Enclosure

For Remotely Mounting Electronic Enclosure

The 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
More Information
Model Chart
EXAMPLE641RM6LEDSeries 641RM Air Velocity Transmitter, 6" probe, with LED display.
SERIES641RM  Air Velocity Transmitter
PROBE LENGTH 6
12
18
24
30
36
 6"
12"
18"
24"
30"
36"
OPTIONS  3
10
15
20
25
30
AT
LED
NIST
ST
3 ft. Cable Length
10 ft. Cable Length
15 ft. Cable Length
20 ft. Cable Length
25 ft. Cable Length
30 ft. Cable Length 
Aluminum Tag
LED Display
NIST Certificate of Calibration 
Stainless Steel Tag
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 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 (seconds).
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 ft (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