On offer today we have something very special, a professional grade wind speed indicator dating from 1975 as new, unused in original box and such a successful design that it is still available for purchase today. Here's a bit of info about this iconic instrument and the company that manufactured it:-
The Dwyer Mark II wind speed indicator with weather-resistant ABS vane measures air velocity from 0 to 80mph and 1 to 12 Beaufort scale and has a built-in spirit level vial to maintain horizontal plane for accurate readings and a zero knob for resetting readings and ensuring proper filling of gauge fluid. The gauge fluid is red for distinct readings on the dual mph and Beaufort scale. The indicator is made of molded plastic to resist breakage and includes the vane, 50ft. of tubing, mounting hardware, a 3/4oz. bottle of gauge fluid, and instructions. It is 5-5/8 x 7-3/8 X 1-1/8 inches (H x W x D, where H is height, the vertical distance from the lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back). It is commonly used for weather monitoring.
Anemometers, also called wind meters, measure air velocity and are most commonly used for weather monitoring to determine wind speed and for HVAC applications to determine air flow within ducts. In addition to air velocity, anemometers may measure wind direction, air pressure, air flow volume, air temperature, humidity, light, and other properties. The most common types of anemometer are cup, vane, hot-wire, and Pitot tube. Cup and vane anemometers calculate air velocity based on the number of rotations of the cups or vane. Hot-wire anemometers calculate air velocity by measuring the change in electrical resistance as air flow cools a heated wire. Pitot tube anemometers measure air pressure within a tube and calculate air velocity based on the difference in pressure between the air inside and outside of the tube. Many anemometers have digital readouts and can display air velocity readings in different units of measure, such as meters per second (m/s), feet per minute (ft./min. or fpm), knots, miles per hour (mph), and kilometers per hour (km/h).
Dwyer Instruments manufactures measurement and control instruments, including pressure gauges, flow meters, level instrumentation, temperature instrumentation, and air quality monitors. The company, founded in 1931, is headquartered in Michigan City, IN.
What's in the Box?
- Dwyer Mark II wind speed indicator
- ABS plastic vane
- 50 ft. of tubing
- Mounting hardware
- 3/4 oz. bottle of gauge fluid