Wind Mark III Wind Speed and Direction Sensors

The Wind Mark III Wind Sensors combine accuracy and reliability with low cost. The sensors meet EPA Prevention of Significant Deterioration (PSD) requirements. They are also well suited for general wind monitoring applications.

Wind speed is sensed by a three-cup anemometer and is converted to an electrical signal by a 20-slot photochopper, which uses a solid-state light source for maximum reliability. Wind direction is sensed by a counterbalanced wind vane coupled to a precision, low-torque potentiometer. Both the wind speed and wind direction sensors use stainless steel precision ball bearings for maximum life and low threshold. Traceability to NIST is available as an option for each anemometer cup assembly by comparison testing against a NIST transfer standard in the factory wind tunnel.

The sensors and their crossarm are an integral unit. The prewired crossarm mounts on a 3/4" IPS vertical pipe stub (1.05" o.d.) Orientation of the crossarm is along an East-West plane.

Specifications

Wind Speed
Accuracy: 0.25 mph or ± 1.5% (± 0.11 m/s)
Threshold: < 1 mph (< 0.45 m/s)
Distance constant: 15.0' (4.6 m) of air max, 8.0' (2.4 m) of air max (optional)
Operating range: 0-125 mph (0-55 m/s)
Signal output: Nominal 2.0 Vpp into 4.7 Kohm, frequency proportional to wind speed, amplitude dependent on supply voltage
Power requirements: 5-7 Vdc @ 1 mA nominal
Heater power: 115 Vac, 60 Hz, 20 watts; 220 Vac, 50 Hz, 20 watts
Weight: less than 2 lbs (0.9 kg)
Turning radius: 3.75" (9.5 cm)
Operating temperature: -40° to 140°F (-40° to 60°C)

Wind Direction
Accuracy: ± 3°
Threshold: < 1 mph (< 0.45 m/s)
Distance constant: 15.0' (4.6 m) of air max, 8.0' (2.4 m) of air max (optional)
Damping ratio: 0.4-0.6 at 10° initial angle of attack
Operating range: 0-360° mechanical
Signal output: Variable DC voltage, magnitude proportional to wind direction
Power requirements: Max 5 mA through 2 Kohms
Heater power: 115 Vac, 60 Hz, 20 watts; 220 Vac, 50 Hz, 20 watts
Weight: less than 2 lbs (0.9 kg)
Turning radius: 17.5" (41.9 cm)
Operating temperature: -40° to 140°F (-40° to 60°C)

Ordering Information

200-102083 Wind Mark III Wind Sensors with Crossarm, less cable and connector
200-101234-0 External Heater, 115 Vac
200-101234-1 External Heater, 220 Vac
200-102138 Replacement Cup Assy, black Lexan
200-101944 Replacement Vane Assy, fast response magnesium
200-100609-0 Connector
330-0624 Sensor Cable, per foot
200-1012/xxx Heater Cable with Connector, specify cable length
200-101278 Wind System consisting of: 200-WM-III Wind Sensor Set, 50' of wind cable with connector, electronics package in NEMA enclosure with analog outputs 0-5V or 0-1V, 0 to 50/100 mph and 0 to 540°

Signal conditioners for the WM-III sensors are available in modular form with a variety of full scale ranges, engineering units, outputs, and several other options. Consult factory for information.

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