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Dwyer Air Velocity Transmitter: 4 mA to 20 mA, 32°F to 140°F, 641-18-LED, 250 fpm to 15,000 fpm - Air Velocity Transmitters
DwyerAir Velocity Transmitters

Dwyer Air Velocity Transmitter: 4 mA to 20 mA, 32°F to 140°F, 641-18-LED, 250 fpm to 15,000 fpm

The DWYER Air Velocity Transmitter (model 641-18-LED) is an air velocity transmitter with a 4 mA to 20 mA output, an LED display, and a measurement range of 250 fpm to 15,000 fpm. It offers an air velocity accuracy…

SKU 3G-OTH-168005

Brand
Dwyer
Item
Air Velocity Transmitter: 4 mA to 20 mA, 32°F to 140°F, 641-18-LED, 250 fpm to 15,000 fpm
Category
Air Velocity Transmitters
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Technical Specifications

Dwyer
Manufacturer Part Number
641-18-LED
Type
32°F to 140°F, 641-18-LED, 250 fpm to 15,000 fpm, LED
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 Air Velocity Transmitter (model 641-18-LED) is an air velocity transmitter with a 4 mA to 20 mA output, an LED display, and a measurement range of 250 fpm to 15,000 fpm. It offers an air velocity accuracy of +/-3% over 32 to 122 °F and operates within an ambient temperature range of 32°F to 140°F. A calibration certificate is not included with this unit.

Frequently Asked Questions

What is the Dwyer 641-18-LED air velocity transmitter used for?

The Dwyer 641-18-LED measures air velocity from 250 fpm to 15,000 fpm in HVAC ducts, fume hoods, and cleanrooms. It outputs a 4 mA to 20 mA signal for building management systems and includes an LED display for local readout.

What are the specifications of the Dwyer 641-18-LED?

The Dwyer 641-18-LED has an air velocity accuracy of +/-3% from 32°F to 122°F, operates from 32°F to 140°F ambient, and outputs 4 mA to 20 mA. It measures 250 fpm to 15,000 fpm with an LED display. Calibration certificate is not included.

Where to buy the Dwyer 641-18-LED worldwide?

3G Electric supplies the Dwyer 641-18-LED air velocity transmitter worldwide. As a global industrial distributor, we handle full logistics, customs clearance, and delivery to your site. Contact us for availability and lead time.

How to install the Dwyer 641-18-LED air velocity transmitter?

Mount the Dwyer 641-18-LED in a duct or plenum with the sensing probe oriented into the airflow. Wire the 4 mA to 20 mA loop to a controller or PLC. Follow Dwyer's manual for proper placement and avoid obstructions upstream for accurate readings.

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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