| Description |
| Sensor type |
3-cup anemometer |
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| Applications |
wind resource assessment |
| meteorological studies |
| environmental monitoring |
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| Sensor range |
1 m/s to 96 m/s (2.2 mph to 214 mph) (highest recorded) |
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| Instrument compatibility |
all NRG loggers |
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| Output signal |
| Signal type |
low level AC sine wave, frequency linearly proportional to windspeed |
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| Transfer function |
m/s = (Hz x 0.765) + 0.35 |
| [miles per hour = (Hz x 1.711) + 0.78] |
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| Accuracy |
within 0.1 m/s (0.2 mph) for the range 5 m/s to 25 m/s (11 mph to 55 mph) |
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| Output voltage at threshold |
80 mV (peak to peak) minimum |
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| Output voltage at 60Hz |
12 V (peak to peak) typical |
| output amplitude NOT proportional to windspeed |
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| Calibration |
each anemometer individually calibrated, calibration reports provided via electronic download |
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| Output signal range |
0 Hz to 125 Hz (highest recorded) |
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| Response characteristics |
| Threshold |
0.78 m/s (1.75 miles per hour) |
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| Distance constant (63% recovery) |
3.0 m (10 feet) |
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| Moment of inertia |
68 x 10-6 S-ft2 |
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| Swept diameter of rotor |
190 mm (7.5 inches) |
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| Installation |
| Mounting |
onto a 13 mm (0.5 inch) diameter mast with cotter pin and set screw |
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| Tools required |
0.25 inch nut driver, petroleum jelly, electrical tape |
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| Environmental |
| Operating temperature range |
-55 °C to 60 °C (-67 °F to 140 °F) |
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| Operating humidity range |
0 to 100% RH |
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| Physical |
| Connections |
4-40 brass hex nut/post terminals |
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| Weight |
0.14 kg (0.3 pounds) |
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| Dimensions |
3 cups of conical cross-section, 51 mm (2 inches) dia. |
| 81 mm (3.2 inches) overall assembly height |
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| Materials |
| Cups |
one piece injection-molded black polycarbonate |
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| Body |
housing is black ABS plastic |
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| Shaft |
beryllium copper, fully hardened |
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| Bearing |
modified Teflon, self-lubricating |
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| Magnet |
Indox 1, 25 mm (1 inch) diameter, 13 mm (0.5 inch) long, 4 poles |
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| Coil |
single coil, bobbin wound, 4100 turns of #40 wire, shielded for ESD protection |
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| Boot |
protective PVC sensor terminal boot included |
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| Terminals |
brass |