Air Velocity Transmitter works in dirty environments.

Press Release Summary:

Suited for monitoring air velocities in polluted environments, Series 641B employs protected, heated mass flow sensor from which users can remove dust and debris. Product offers operational versatility with its 8 field-selectable ranges from 0-250 fpm to 2,000 fpm.

Original Press Release:

NEW! Air Velocity Transmitter Detects Flow in Dirty Air Environments

Dwyer Instruments, Inc., the preferred source for your complete range of practical and affordable instrumentation, is announcing the release of its new Series 641B Air Velocity Transmitter. The Series 641B is ideal for monitoring air velocities in polluted environments with its protected heated mass flow sensor. Proper sensor performance can be maintained in dirty air environments by easily removing dust and debris from the sensor which is problematic for Pilot tubes and other flow sensing transmitters.

The Series 641B is extremely versatile with its 8 field selectable ranges from 0-250 FPM to 2000 FPM (0-1.25 MPS to 10 MPS).

Dwyer Instruments, Inc. produces a broad range of measuring and control instruments for pressure, temperature, level and flow, and other related applications.

To order a free catalog or for more information, contact Dwyer Instruments, Inc., P.O. Box 373, Michigan City, Ind., 46361. Telephone: (800) 872-9141 or (219) 879-8000; Fax: (219) 872-9057; Internet address:; E-mail:

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