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

Voltage : 10 To 16 VAC. 1.5 A Rating Required On Supply Due To Initial Power Surge Drawn By Tran

output : 3 Or 4-wire Connection.

Condition : New

Usage : Non-combustible Gases.

Feature : Excellent Performance

Weight : 13.2 Oz (374.26 G).

Warranty : 1yrs

Material : Aluminum, Plastic

Type : Air Velocity Transducer, 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

Voltage : 10 To 16 VAC. 1.5 A Rating Required On Supply Due To Initial Power Surge Drawn By Tran

output : 3 Or 4-wire Connection.

Condition : New

Usage : Non-combustible Gases.

Feature : Excellent Performance

Weight : 13.2 Oz (374.26 G).

Warranty : 1yrs

Material : Aluminum, Plastic

Type : Air Velocity Transducer, Series 641RM Air Velocity Transmitter With Cable