Anemometer Thies First Class Advanced II

Optically-scanned cup anemometer
Thies First Class Advanced gives outstanding performance. The sensor has been classified acc. to IEC 61400-12-1 Edition 2.0. It gives optimal dynamic performance with the following characteristics:

  • High accuracy
  • Minimal deviation from cosine line
  • Excellent behaviour to turbulences
  • Minimum overspeeding    Small distance constant
  • Low start up value
  • Low power consumption
  • Digital output

The sensor is designed for measuring the horizontal wind velocity in the field of meteorology, climate research, site assessment, and the measurement of capacity characteristics of wind power systems (power curves). The patented design is the result of long testing in the wind tunnel. The sensor features dynamic behaviour also at high turbulence intensity, minimal overspeeding, and a low starting values. It requires only low maintenance thanks to its low-inertia and ball-bearing cup star. The anemometer is equipped with electronically regulated heating to guarantee smooth running of the ball bearings and prevent icing of shaft and slot during winter operation.

Characteristics

Physical functionality

Optically-scanned cup anemometer

Delivered signal

Frequency output (pulse)

Accuracy

0.3 ... 50 m/s      1% of meas. value or < 0.2 m/s

Linearity

Correlation factor r between frequency f and wind speed y
y = 0.0462 × f + 0.21 typical
r > 0.999 99      (4 ... 20 m/s)

Starting velocity

< 0.3 m/s

Resolution

0.05 m wind run

Distance constant

< 3 m (acc. to ASTM D 5096 - 96)     3 m acc. to ISO 17713-1
Turbulent flow Deviation Δv  turbulent compared with stationary horizontal flow
-0.5 % < Δv < +2 %
Frequency < 2 Hz
Inclined flow
- mean deviation from cosinus line
- Turbulence effect

< 0.1 % (in range of ±20°)
< 1 % (in the range up to 30% turbulence intensity)

Wind load

Approx. 100 N @ 75 m/s

Operating range

Measuring range

0.3 ... 75 m/s

Survival speed

80 m/s (mind. 30 min)

Permissible ambient conditions

-50 ... +80 °C, all occuring situations of relative humidity

Electrical data

Output signal

Form rectangle, 1082 Hz @ 50 m/s, supply voltage max. 15 V

Electrical supply for optoelec. scanning

Voltage: 3.3 ... 48 VDC (galvanic isolation from housing)
Current: 0.3 mA @ 3.3 V (w/o external load)
              < 0.5 mA @ 5 V (w/o external load)

Electrical supply for heating

Voltage:  24 V AC/DC (galvanic isolation from housing)
Idling voltage: max. 30 V AC, max. 48 VDC
Power consumption:   25 W

General

Connection

8-pole plug-connection for shielded cable in the shaft

Mounting

on mast tube R1”

Dimensions

290 x 240 mm

Fixing boring

35 x 25 mm

Weight

approx. 0.5 kg

Material Housing

Cup star

Anodised aluminiun

Carbon-fibre-reinforced plastic

Type of bearings

Metallic ball bearings

Protection

IP 55 (DIN 40050)

Patent

EP 1 398 637
DE 103 27 632
EP 1 489 427

EMC

EN 61000-6-2:2001 (immunity)
EN 55022:2001, Class B (interfering transmission)

Manufacturer

Thies