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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

Also listed as: 641RM12LED · 641RM 12 LED

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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Local availability & support — the Philippines

Delivery
5–8 business days door-to-door; Bureau of Customs clearance typically 2–4 business days.
Payment
Invoicing in PHP or USD. Bank transfer and corporate PO accepted.
Ships to
Manila, Quezon City, Cebu, Davao, Batangas

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

Technical Documents

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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.

Supplied to the Philippines — compatible with 60 Hz installations. DHL Express delivery to Manila, Quezon City, Cebu, customs and duties handled door-to-door.

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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Compatible alternatives & equivalents

Cross-referenced by specification & description
DWYER Air Velocity Transmitter: 4 mA to 20 mA, 32°F to 140°F, 641RM-12, 250 fpm to 15,000 fpm
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DWYER Air Velocity Transmitter: 4 mA to 20 mA, 32°F to 140°F, 641-12, 250 fpm to 15,000 fpm
The Dwyer 641-6 air velocity transmitter measures air velocity from 250 fpm to 15,000 fpm with an accuracy of ±3% over 32°F to 122°F. It operates in temperatures from 32°F to 140°F and provides a 4 mA to 20 mA output signal. This transmitter is used in HVAC and industrial ventilation systems for duct balancing, fume hood monitoring, and cleanroom airflow verification
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The Dwyer 641-6 air velocity transmitter measures air velocity from 250 fpm to 15,000 fpm with an accuracy of ±3% over 32°F to 122°F. It operates in temperatures from 32°F to 140°F and provides a 4 mA to 20 mA output signal. This transmitter is used in HVAC and industrial ventilation systems for duct balancing, fume hood monitoring, and cleanroom airflow verification
DWYER Air Velocity Transmitter: 4 mA to 20 mA, 32°F to 140°F, 641-24, 250 fpm to 15,000 fpm
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DWYER Air Velocity Transmitter: 4 mA to 20 mA, 32°F to 140°F, 641-24, 250 fpm to 15,000 fpm

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Air velocity transmitter with 4 mA to 20 mA output and LED display. Measures 250 to 15,000 fpm with accuracy of +/-3% from 32 to 122 °F. Operating temperature range 32 to 140 °F. Suitable for HVAC duct, fume hood, and cleanroom airflow monitoring. Calibration certificate not included
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Air velocity transmitter with 4 mA to 20 mA output and LED display. Measures 250 to 15,000 fpm with accuracy of +/-3% from 32 to 122 °F. Operating temperature range 32 to 140 °F. Suitable for HVAC duct, fume hood, and cleanroom airflow monitoring. Calibration certificate not included
Air velocity transmitter with 4 mA to 20 mA output and LED display. Measures 250 fpm to 15,000 fpm with accuracy of ±3% from 32°F to 122°F. Operates in ambient temperatures from 32°F to 140°F. Used for monitoring airflow in HVAC ducts, fume hoods, and cleanrooms
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Air velocity transmitter with 4 mA to 20 mA output and LED display. Measures 250 fpm to 15,000 fpm with accuracy of ±3% from 32°F to 122°F. Operates in ambient temperatures from 32°F to 140°F. Used for monitoring airflow in HVAC ducts, fume hoods, and cleanrooms
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The Dwyer AVUL-5DM1-LCD air velocity transmitter measures airflow from 1000 to 4000 fpm with +/-5% accuracy. It features an LCD display, 4-20 mA output, and Modbus communication protocol. Maximum operating temperature is 122°F. Calibration certificate not included. Suitable for HVAC duct, fume hood, and cleanroom monitoring
Air velocity transmitter with 4-20 mA output and BACnet communication protocol. Measures air velocity from 400 to 1000 fpm with ±3% accuracy over a temperature range of 32°F to 122°F. Suitable for monitoring duct airflow in HVAC systems, cleanrooms, and industrial ventilation. Calibration certificate not included
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Air velocity transmitter with 4-20 mA output and BACnet communication protocol. Measures air velocity from 400 to 1000 fpm with ±3% accuracy over a temperature range of 32°F to 122°F. Suitable for monitoring duct airflow in HVAC systems, cleanrooms, and industrial ventilation. Calibration certificate not included
The Dwyer AVUL-5DM1 air velocity transmitter measures airflow from 400 to 1,000 fpm with ±5% accuracy. It provides a 4-20 mA output and Modbus communication for integration into building automation or process control systems. Operating temperature range is 32°F to 122°F. Calibration certificate not included
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This air velocity transmitter measures air flow from 400 to 1000 fpm with an accuracy of ±5%. It provides a 4-20 mA output signal and operates in temperatures from 32°F to 122°F. The unit uses a universal communication protocol and is suited for HVAC and industrial ventilation monitoring. Calibration certificate not included
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