Series 641RM Air Velocity Transmitter With Cable

Series 641RM Air Velocity Transmitter with Cable

Series 641RM Air Velocity Transmitter with Remote Probe

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

ModelDescription

• 641RM-12Air velocity transmitter, without LED display.
• 641RM-12-LEDAir velocity transmitter, with LED display.

Specifications

• 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).

Features

• 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

Accessories

Model NumberDescription

• A-156Flange mounting plate with 1/2" female NPT.
• A-158Split flange.
• A-159Mounting gland with 1/2" male NPT.
• 641-LEDField-upgradeable LED.

Related Products

• Model VT120 Integral Vane Thermo-Anemometer
• Series AVU Air Velocity Transmitter
• Model VT-200 Vane Thermo-Anemometer
• Series 641 Air Velocity Transmitter
• Technical Reference Books
• Model 8904 Integral Vane Thermo-Anemometer
• Model 471B Thermo-Anemometer Test Instrument