Vaisala PTB210 SERIES Manuel d'instructions télécharger pdf (Page 17)

2.1.2 Wind Speed - Lambrecht 14577

Function

When weather condition are characterized by high wind speeds, the dome of the

solar tracker should close for protecting the sensitive instrument. Thus, wind speed

is one of the parameters which is determined for protecting the solar tracker. If high

wind speeds do occure at a high level a signal is send to the control system of the

BGC-FTIR-Container, the SPS, to close the dome of the solar tracker. To increase

the reliability of the system, the wind speed is provided by two cup anemometers.

Figure 2.5: Lambrecht Wind Speed 14577

[Manual - Wind-Sensors INDUSTRY 145x7, 10/06]

The sensor is shown in Fig. 2.5. Its main advantages are the electromagnetic, non-

impact measuring principle for precise data acquisition with high resolution and

the double supported ball bearing of the rotation axis. These characteristics assure

high reliability, longevity, lower friction as well as lower abrasion and high accuracy.

Furthermore, there is an automatic heating element to avoid freezing of the ball

bearing.

Measuring Principle

Measuring wind speed is implemented with an integrated circuit (IC) including a

hall-sensor-array. The IC is measuring the change in alignment of the magnetic ﬁeld

by means of a rotating magnet which is mounted at the cup module of the anemome-

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Vaisala PTB210 SERIES Manuel d'instructions Page 17