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MODEL TD-4 WIND DIRECTION SENSOR
DESCRIPTION
The Texas Electronics, Inc. TD-4 Wind Direction Sensor is a mechanical style wind meter that measures the
horizontal wind azimuth. This unit combines small physical size with superior bearings to meet the EPA's
Prevention of Significant Deterioration (PSD) starting threshold requirements.
The TD-4 wind direction sensor is a freestanding device for measuring the direction of wind. The sensor
consists of a vane and counterweight assembly, which is mechanically coupled to a potentiometer (variable
resistor). As the vane rotates in the wind, the potentiometer changes resistance proportionally to the direction of
wind.
SPECIFICATIONS
Operating Range: 0-360° mechanical
Signal Presentation: 5000 ohm potentiometer,
10000 ohm potentiometer, or
Analog 4-20 mA
5000 ohm output:
0-355° electrical range
3 VDC excitation minimum
10000 ohm output: 0-357° electrical range
3 VDC excitation minimum
Analog 4-20 mA output: 0-355° electrical range
10-30 VDC
Performance:
Accuracy: +/- 3.0°
Starting Threshold: 0.6 mph (0.27 m/s)
Resolution: 1°
Potentiometer Linearity: +/- 1.0%
Environmental:
Operational Envelope: 0-135 mph (0 to 60 m/s)
Temperature: -40 to 160° F (-40 to 70° C)
Relative Humidity: 0-100%
Physical:
Vane Overall Length: 8.5" (21.6 cm)
Overall Height: 6.75" (17.2 cm)
Turning Radius: 13" (33 cm)
Weight: 0.5 lbs (0.23 kg) less cable
Bearings: APEC 3 or better
Mounting Base: Screw attachment, 10-32 machine
screw
Cable: 60' (18.3 m) 3 conductor 22 gauge
Warranty: 3 year