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Series 641RM Air Velocity Transmitter with Remote Probe
Brand: Dwyer Instruments, LLCThe 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.
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
Specifications
Accuracy
- 3 % of Full Scale Process Gas: 0° to 50° C (32° to 122° F)
- 4 % of Full Scale Process Gas: -40° to 0° C & 50° to 100° C (-40° to 32° F & 122° to 212° F)
Ambient Temperature Range
- 0° to 60° C (32° to 140° F)
Approvals & Certifications
- CE
Cable Length
- 6 feet (1.82 metres)
Consumption
- 300 mA - Max.
Display
- 4-1/2-Digit, 1/2” Red LED
Electrical Connectors
- Screw Terminal
Flow Rate
- 250 to 15,000 fpm (1.25 to 75 mps)
Loop Resistance
- 600 ohms, Max.
Media
- Clean Air & Compatible
- Non-Combustible Gases
Mounting
- Duct Mount
NACE & NIST
- NIST Traceable Calibration Certificate
NPT Connection
- 1/2” NPT Female
Output
- 4-20 mA, Isolated 24 V Source, 3 or 4-Wire Connection
Power Requirement
- 10-16 Vac
- 12-35 Vdc
Process Temperature
- -40° to 100° C (-40° to 212° F)
Response Time
- 0.5 to 15 seconds
- 1.5 seconds to 95 % of Final Value
Seat / Seal Material
- PTFE
Sensor / Probe Diameter
- 12” (304.8 mm)
- 5/16” (0.79 cm)
Supply Pressure
- psi: 100 (kPa: 689.5, bar: 7)
- Exhaust stack flow monitoring
- Air control in drying processes
- HVAC air velocity measurements
- Fan supply and exhaust tracking
- Clean room ventilation monitoring
