Envco – Environmental Equipment

Initially, these models were designed to interface with the network of the Automated Surface Observing System (ASOS), the primary surface weather observing network in the United States.

Maintenance-free
The WS425 F/G has no moving parts, and it is resistant to contamination by salt, dust, and corrosion. In addition to improving accuracy and the reliability of data in all wind conditions and climates, the WS425 F/G requires no on-demand or periodic maintenance.

Measurement based on ultrasound
The WS425 F/G uses ultrasound to determine horizontal wind speed and direction. The measurement is based on a transit time, the time it takes for the ultrasound to travel from one transducer to another, which depends on the wind speed.

The transit time is measured in both directions for each pair of the transducer heads. Using two measurements for each of the three ultrasonic paths at 60° angles to each other, the WS425 F/G computes the wind speed and direction.

The wind measurements are calculated in a way that completely eliminates the effects of altitude, temperature, and humidity.

Heating
To secure operation in the most difficult conditions, the sensor has an enhanced heating feature with a total heating power of 150 W. The heater foils are placed inside the ceramic Sensor transducers, the transducer arms, and the bird spike. The heating control is located in the power supply module, an integral part of the delivery.

ASOS compatibility
The WS425 F/G includes a 10-meter sensor cable, a power supply with a heating control circuitry, and power relays to control the heating current.

The optical modem that isolates the sensor from the host system allows for safe communication.

Please read specification sheet and order guide prior to placing an order. Vaisala products are professional grade instruments and have options specific to your application. This information needs to be detailed.