Cảm biến thời tiết WXT520 Vaisala

Benefits and Features
Low maintenance—no moving parts significantly reduces maintenance cost and time
Compact and lightweight
Low power consumption
Fast and simple to install
Outputs an SDI-12 signal that can be measured by many of our dataloggers
Combines the six most essential weather parameters in one instrument
Technical Description
The WXT520′s wind sensor consists of three equally spaced transducers that produce ultrasonic signals. Wind speed and direction are determined by measuring the time it takes for the ultrasonic signal of one transducer to travel to the other transducers.


Precipitation is measured one raindrop at a time. Whenever a raindrop hits the precipitation sensor, an electrical signal is produced that is proportional to the volume of the drop.

The WXT520 has a PTU module that contains a capacitive silicon BAROCAP® sensor for barometric pressure measurements, a capacitive ceramic THERMOCAP® sensor for air temperature measurements, and a capacitive thin film polymer HUMICAP® sensor for relative humidity measurements. The PTU is housed in a naturally-aspirated radiation shield that protects it and reflects solar radiation.


WXT520 Specifications
Electromagnectic Compatibility: Complies with EMC standard EN61326-1
IEC Standards: IEC 60945/61000-4-4, IEC 60945/61000-4-2
Input Voltage: 5 to 30 Vdc (below 5.3 V the measurement performance for high wind speeds may be degraded)
Typical Current Drain @ 12 Vdc: 0.1 mA (SDI-12 standby); 3 mA (Default Measuring Intervals)
Output: SDI-12
Operating Temperature: -52° to +60°C
Storage Temperature: -60° to +70°C
Operating Relative Humidity:
0 to 100% RH
Height: 23.8 cm (9.38 in)
Diameter: 11.5 cm (4.52 in)
Weight: 650 g (1.43 lb)
Air Temperature


Measurement Range: -52° to +60°C
Accuracy: ±0.3°C @ +20°C
Output Resolution: 0.1°C
Barometric Pressure


Measurement Range: 600 to 1100 hPa
Accuracy:
±0.5 hPa @ 0° to 30°C;
±1 hPa @ -52° to +60°C
Output Resolution: 0.1 hPa
Relative Humidity


Measurement Range: 0 to
100% RH
Accuracy:
±3% RH @ 0 to 90% RH;
±5% RH @ 90 to 100% RH
Output Resolution: 0.1% RH
Wind Speed


Measurement Range: 0 to 60 m s-1
Response Time: 0.25 s
Accuracy:  ±0.3 m s-1 or
±3% whichever is greater
(0 to 35 m s-1);
±5% (36 to 60 m s-1)
Wind Direction


Measurement Range: 0° to 360°
Response Time: 0.25 s
Accuracy: ±3°
Output Resolution: 1°
Precipitation


Rainfall Measurement: Cumulative accumulation after latest automatic or manual reset
Collecting Area: 60 cm2
Output Resolution: 0.01 mm (0.001 in)
Field Accuracy for Daily Accumulation: Better than 5% (weather dependent; does not include possible wind induced error)
Rain Duration: Counting each 10-s increment whenever droplet detected
Rain Intensity: 1-min. running average in 10-s steps
Rain Intensity Range:
0 to 200 mm hr-1 (broader range possible with reduced accuracy)