DWYER INSTRUMENTS 641-12-LED Air Velocity Transmitter, 12 Inch Probe, 1/2 Inch Dia., LED Display

Dwyer Instruments 641-12-LED air velocity transmitter is ideal for airflow monitoring in air control, HVAC, exhaust stack, drying, fan supply and ventilation operations. This test device may be utilised with a range of flow rates & temperatures and offer velocity data. It helps in cleaning compatible, non-combustible gases and air.

Working Mechanism:

• The air velocity sensor makes use of the hot-film anemometry principle.
• The sensor is made up of two resistive meshes formed on a thin glass substrate using cutting-edge thin-film technology.
• This temperature drops as a result of the moving air.
• One of the two resistors serves as a temperature sensor, measuring the temperature of the flowing medium.
• The cooling effect is inversely proportional to air temperature and directly related to mass flow that affects air velocity.
• Mass flow is measured at equilibrium by the surface temperature of the sensor.

Features:

• Dwyer Instruments 641-12-LED air velocity transmitter has a digital filter to offer signal damping.
• The compact, NEMA 4X enclosure ensures high durability.
• It allows 16 field-selectable ranges for user convenience in several airflow applications.
• This unit comes with a heated mass flow sensor for accurate velocity measurements at different temperatures & flow rates.
• It is configured with a simple push-button set-up for easy calibration & installation as well as minimising system complexity.

Compatible Accessories:

• Dwyer Instruments Optional LEDs: They offer a full, affordable solution for the local indication of air flow.

Standards and Approvals:

• CE
• NEMA

Frequently Asked Questions:

Q. How to select a suitable location to install this transmitter?

A.

• To attach the enclosure, choose a site where temperature ranges from 32 to 140 degrees Fahrenheit.
• As long as the entire loop resistance is under 600 ohms, the transmitter can be placed at any distance from the receiver.
• The probe should be placed in an area with conditions that are typical of the entire environment being observed.
• Avoid areas with turbulence, stagnation or quickly changing temperatures or velocities because these factors could impact the measurements.
• In turbulent situations, the filter setting can be used to average velocity values.

Q. What should be the position of the transmitter while installation?

A. The transmitter is not position-sensitive and can be installed in any orientation.

Q. How to install air velocity transmitters?

A.

• A 1/2 inch NPT male integral connection enables the direct installation of pipe fittings or a pipe flange.
• A 5/16 inch compression fitting can also be used to install it.
• The calibrated airflow's direction is shown by arrows on the hex flats at the base of the probe.
• Put these arrows in the process air's direction.
• For easier attachment, the casing may spin apart from the probe.