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Dwyer 9671 Vane Thermo-AnemometerThe large 1.8" (45 mm) display allows users to easily view readings. User-selectable wind speed units include ft/min, m/s, knots, mph and km/hr. In addition to these functions, the 9671 is capable of measuring relative humidity, wet bulb temperature, dew point and BTU capacity. A built-in sensor records ambient temperature in °F or °C.
Features
Applications
Anemometers are instruments used to measure wind speed or air velocity in meteorology and aerodynamics. The name is derived from the Greek root Anemos, meaning wind. There are many anemometer sensor types with one of the most popular being thermo, or hot-wire, anemometers for HVAC/R air velocity monitoring. Thermo-anemometers use a sensor element that is heated up beyond the ambient temperature. Airflow moving past the sensor will have a cooling effect that is directly proportional to the flow velocity.
Hot wire anemometers come in three basic types: constant current, constant voltage, and constant temperature. All three types have circuits that are based on trying to maintain a specific variable during the cooling effect based on Ohm's Law. Thermo-anemometers offer good low flow detection, fast response times, and high rangeability of measurements. They are omni-directional, making them good for turbulent flows and easier to use than pitot tubes, but are more fragile than pitot tubes.
Usually, a probe style sensor is made for insertion into ducts and pipes. For constant temperature thermo-anemometers, two temperature sensors are installed at the end of the probe, typically resistance temperature detectors (RTDs). One RTD measures the ambient temperature as a reference. The second RTD is continuously maintained at a constant temperature above ambient. The higher the air velocity, the more current is required to maintain the second RTD's temperature. Based on the current usage, the air velocity is calculated.
Like a pitot tube, thermo-anemometers are a single point sensing device that requires being in the center of the velocity profile or the use of traverse readings for accurate measurements.
| Display | 1 x 1.8" (26 x 45 mm) |
| Serial Communications | 9600 bps, 8 data bits, no parity |
| Power Requirements | 4 x AAA alkaline batteries, user replaceable |
| Battery Life | 100 hours |
| Vane Diameter | 3" (77 mm) |
| Weight | 6 oz (170 g) |
| Agency Approvals | CE |
All returns must be authorized. Items returned prior to authorization will not be accepted. For international customers where applicable, customers must ship any returns to us freight and duty prepaid. Return freight charges for internationsl shippments will be the responsibility of the customer.
Defective new equipment may be returned for warrantyrepair/exchange to us within (5) days of the shipment receipt date. After five (5) days, returns will be handled by direct contact and in accordance with the warranty terms of the item's manufacturer. Items that have malfunctioned due to mishandling, electrical overload, etc., will be subject to repair charge.
Non defective new equipment will be authorized for return within five (5) days of the shipment receipt date if the equipment is still in new, re-sellable condition with the original manual(s), accessories, packing material and carton. We reserve the right to reject returnsin which there is no original packaging, missing accessories, damage or visible signs of usage of the item. A restocking fee of up to 25% of purchase price may apply. Special orders and dangerous goods are non-returnable.
(Do not write anytingon the manufacturer's original package or use as a shipping carton. Include all accessories, manuals and warranties.)
Please, include a copy of the packing list or invoice with a reason for the return. Your return authorization number is valid for thirty (30) days.
We can ship to both US and Canada. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will charge a flat rate shipping for your items.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
Not Applicable
| Condition: | NA |
Defective new equipment may be returned for warrantyrepair/exchange to us within (5) days of the shipment receipt date. After five (5) days, returns will be handled by direct contact and in accordance with the warranty terms of the item's manufacturer. Items that have malfunctioned due to mishandling, electrical overload, etc., will be subject to repair charge.
Non defective new equipment will be authorized for return within five (5) days of the shipment receipt date if the equipment is still in new, re-sellable condition with the original manual(s), accessories, packing material and carton. We reserve the right to reject returnsin which there is no original packaging, missing accessories, damage or visible signs of usage of the item. A restocking fee of up to 25% of purchase price may apply. Special orders and dangerous goods are non-returnable.
(Do not write anytingon the manufacturer's original package or use as a shipping carton. Include all accessories, manuals and warranties.)
Please, include a copy of the packing list or invoice with a reason for the return. Your return authorization number is valid for thirty (30) days.
