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Dwyer Air Velocity Transmitter: 4 mA to 20 mA, 32°F to 140°F, 641RM-12-LED - Air Velocity Transmitters
DwyerAir Velocity Transmitters

Dwyer Air Velocity Transmitter: 4 mA to 20 mA, 32°F to 140°F, 641RM-12-LED

The DWYER 641RM-12-LED is an air velocity transmitter with a 4 mA to 20 mA output, operating from 32°F to 140°F and measuring 250 fpm to 15,000 fpm. It offers an air velocity accuracy of +/-3% from 32 to 122 °F. This…

SKU 3G-OTH-168003

Brand
Dwyer
Item
Air Velocity Transmitter: 4 mA to 20 mA, 32°F to 140°F, 641RM-12-LED
Category
Air Velocity Transmitters
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Technical Specifications

Dwyer
Manufacturer Part Number
641RM-12-LED
Type
32°F to 140°F, 641RM-12-LED, 250 fpm to 15,000 fpm
Air Velocity Accuracy
+/-3% (32 to 122 °F)
Calibration Certificate
Not Included
View Full Spec Sheet

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Dwyer Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The DWYER 641RM-12-LED is an air velocity transmitter with a 4 mA to 20 mA output, operating from 32°F to 140°F and measuring 250 fpm to 15,000 fpm. It offers an air velocity accuracy of +/-3% from 32 to 122 °F. This model does not include a calibration certificate.

Frequently Asked Questions

What is the Dwyer 641RM-12-LED air velocity transmitter used for?

The Dwyer 641RM-12-LED measures air velocity from 250 fpm to 15,000 fpm in HVAC, cleanroom, and industrial ventilation systems. It outputs a 4 mA to 20 mA signal for remote monitoring and control of airflow in ducts or fume hoods.

What are the specifications of the Dwyer 641RM-12-LED?

The Dwyer 641RM-12-LED has an air velocity accuracy of +/-3% from 32 to 122 °F, operates from 32°F to 140°F, and measures 250 fpm to 15,000 fpm. It provides a 4 mA to 20 mA output and does not include a calibration certificate.

Where to buy the Dwyer 641RM-12-LED worldwide?

3G Electric supplies the Dwyer 641RM-12-LED air velocity transmitter worldwide. As a global industrial equipment distributor, we handle full logistics, customs clearance, and delivery to your location. Contact us for availability and lead time.

How to install the Dwyer 641RM-12-LED air velocity transmitter?

Mount the Dwyer 641RM-12-LED in a duct with the sensor tip facing airflow. Connect the 4 mA to 20 mA output to a compatible controller or PLC. Ensure ambient temperature stays within 32°F to 140°F. Calibration is recommended periodically; this model ships without a certificate.

Used in

Common applications for Dwyer
Combustion air-filter monitoring — Magnehelic Series 2000 on burner air-intake filter banks
Clean-room and pharmaceutical pressurisation — Magnehelic / Capsuhelic differential-pressure gauges
HVAC fan-discharge static pressure — Mark II inclined-vertical manometers on AHU test points
Filter-blockage alarms — Photohelic Series 3000 combined gauge/switch on air-handling units
BMS-integrated pressure monitoring — Digihelic DH3 with 4–20 mA output for building management

Dwyer Products

3G Electric supplies Dwyer air velocity transmitters. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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