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Dwyer Air Velocity Transmitter: 4 mA to 20 mA, 32°F to 140°F, 641-18 - Air Velocity Transmitters
DwyerAir Velocity Transmitters

Dwyer Air Velocity Transmitter: 4 mA to 20 mA, 32°F to 140°F, 641-18

The DWYER Air Velocity Transmitter (model 641-18) is an air velocity transmitter that outputs a 4 mA to 20 mA signal. It measures air velocity from 250 fpm to 15,000 fpm within an operating temperature range of 32°F…

SKU 3G-OTH-168004

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

Dwyer
Manufacturer Part Number
641-18
Type
32°F to 140°F, 641-18, 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 641-18) is an air velocity transmitter that outputs a 4 mA to 20 mA signal. It measures air velocity from 250 fpm to 15,000 fpm within an operating temperature range of 32°F to 140°F, with an accuracy of +/-3% from 32 to 122 °F. This unit does not include a calibration certificate.

Frequently Asked Questions

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

The Dwyer 641-18 air velocity transmitter measures air flow from 250 fpm to 15,000 fpm and outputs a 4 mA to 20 mA signal. It is used in HVAC, ventilation, and industrial process applications where accurate air velocity monitoring is required within 32°F to 140°F.

What are the specifications of the Dwyer 641-18?

The Dwyer 641-18 measures air velocity from 250 fpm to 15,000 fpm with an accuracy of +/-3% from 32°F to 122°F. Operating temperature range is 32°F to 140°F. Output is 4 mA to 20 mA. Calibration certificate is not included.

Where to buy the Dwyer 641-18 air velocity transmitter worldwide?

3G Electric supplies the Dwyer 641-18 air velocity transmitter worldwide. As a global industrial solutions provider, we handle logistics, customs, and delivery to your location. Contact us to order this model with a 4 mA to 20 mA output and 250 fpm to 15,000 fpm range.

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

Install the Dwyer 641-18 in a straight duct section per manufacturer guidelines, ensuring proper orientation for accurate air velocity measurement from 250 fpm to 15,000 fpm. Connect the 4 mA to 20 mA output to your control system. Verify wiring and seal the insertion 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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