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

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

The DWYER Air Velocity Transmitter (model 641RM-12) is an air velocity transmitter with a 4 mA to 20 mA output, measuring from 250 fpm to 15,000 fpm. It operates within a temperature range of 32°F to 140°F and offers…

SKU 3G-OTH-168002

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

Dwyer
Manufacturer Part Number
641RM-12
Type
32°F to 140°F, 641RM-12, 250 fpm to 15,000 fpm
Air Velocity Accuracy
+/-3% (32 to 122 °F)
Calibration Certificate
Not Included
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Dwyer Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The DWYER Air Velocity Transmitter (model 641RM-12) is an air velocity transmitter with a 4 mA to 20 mA output, measuring from 250 fpm to 15,000 fpm. It operates within a temperature range of 32°F to 140°F and offers an air velocity accuracy of +/-3% from 32 to 122 °F. This product does not include a calibration certificate.

Frequently Asked Questions

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

The DWYER 641RM-12 air velocity transmitter measures air flow from 250 fpm to 15,000 fpm in HVAC, ventilation, and industrial process systems. It outputs a 4 mA to 20 mA signal for monitoring and control applications.

What are the specifications of the DWYER 641RM-12?

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

Where to buy the DWYER 641RM-12 worldwide?

3G Electric supplies the DWYER 641RM-12 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 air velocity transmitter?

Install the DWYER 641RM-12 in a straight duct section per manufacturer guidelines, ensuring proper orientation for accurate flow measurement. Connect the 4 mA to 20 mA output to your control system. Verify wiring and seal the mounting point to prevent leaks.

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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