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641RM-12 | Air velocity transmitter | without LED display. | Dwyer Instruments

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Overview

Details for 641RM-12

Dwyer Air Velocity Transmitter (Model 641RM-12) features a 6' cable for remote monitoring. Its 12" probe measures air velocity in ducts, stacks, and other industrial environments with accuracy of Â±3% of reading Â±3 F.S. The transmitter's 4-20mA output signal is compatible with most data acquisition systems, making it easy to integrate into your existing infrastructure. Shop our HVAC supply store now for unbeatable prices and fast shipping on all Dwyer Instruments products!

Series 641RM Air Velocity Transmitter with Remote Probe

For Remotely Mounting Electronic Enclosure

The Series 641RM Air Velocity Transmitter with Remote Probe 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.

NIST CALIBRATION available in Product Configurator.

Product Applications

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

Output signal conditioning with digital filtering
Install in tight spaces with compact design
Easy setup with on-board buttons

Specifications

Series: 641RM Air Velocity Transmitter with Remote Probe
Category/Type: Air Velocity
Type: Air Velocity Transmitter
Series: 641RM Air Velocity Transmitter with Remote Probe
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).
Range: 250 FPM (1.25 MPS) to 15;000FPM (75 MPS).
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).