200-101908 Current Loop Wind Sensors

The 200-101908 Current Loop Wind Sensors combine accuracy and reliability with low cost. Sensors with current loop outputs are ideal for applications requiring more than a few hundred feet of separation between the sensor and the signal conditioning, data acquisition, or display systems. These same sensors are also effective in high electrical noise environments. Additionally, the amount of wiring is reduced when current loops are used which can help to reduce both the total cost and time of installation of a turn‑key system.

The 200-101908 Current Loop Wind Sensors meet the EPA's 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 an NIST transfer standard at the factory wind tunnel.

The wind 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. A 24 Vdc/50 mA source is required to operate the wind set over a four conductor cable which can be up to a mile in length. The 24 Vdc/50 mA source can be supplied by the Model 200-101949 Wind Speed/Wind Direction Current Loop Display or by any customer supplied voltage source which meets the 24 Vdc/50 mA requirements.

Optional external heaters are available for both sensors. These heaters consume approximately 10 watts of power per sensor and are thermostatically controlled. The optional external heaters require customer supplied AC power.

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: 4-20 mA proportional to 0-100 mph
Power requirements: 24 Vdc at 20 mA maximum
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: 4-20 mA proportional to 0-540°
Power requirements: 24 Vdc at 20 mA maximum
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

200-101908-3 Current Loop Wind Sensors 0-360°, less cable & connector
200-101908-5 Current Loop Wind Sensors 0-540°, less cable & connector
200-101234-0 External Heater, 115 Vac
200-101234-1 External Heater, 220 Vac
200-101949 Digital Current Loop Display (WS/WD)
200-101982 Connector
330-0420 SensorCable, per foot
200-1012/xxx Heater Cable with Connector, specify cable length

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