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The Vaisala WXT531 is a sensor with parameter combinations that allows you to choose what is right for your application and is the flexible, integrated building block for weather applications. The WXT531 measures rainfall.
Barometric Pressure
Range Accuracy (for sensor element) Output resolution | 600 ... 1100 hPa ±0.5 hPa at 0 ... +30 °C (+32 ... +86 °F) ±1 hPa at -52 ... +60 °C (-60 ... +140 °F) 0.1 hPa, 10 Pa, 0.001 bar, 0.1 mmHg, 0.01 inHg |
Air Temperature
Range Accuracy (for sensor element) at +20 °C (+68 °F) Output resolution | -52 ... +60 °C (-60 ... +140 °F) ±0.3 °C (0.17 °F) 0.1 °C (0.1 °F) |
Relative Humidity
Range Accuracy (for sensor element) Output resolution PTU Measuring interval | 0 ... 100 %RH ±3 %RH at 0 ... 90 %RH ±5 %RH at 90 ... 100 %RH 0.1 %RH 1 ... 3600 s (= 60 min), at one second steps |
Precipitation
RAINFALL Collecting area Output resolution Field accuracy for long-term accumulation | Cumulative accumulation after the latest auto or manual reset 60 cm2 0.01 mm (0.001 in) Better than 5 %, weather dependent |
RAIN DURATION Output resolution | Counting each 10-second increment whenever droplet detected 10 s |
RAIN INTENSITY Range | Running one minute average in 10 second steps. 0 … 200 mm/h (broader range with reduced accuracy) |
Inputs and Outputs
Operating voltage | 6...24 VDC (-10% ... +30%) |
Average current consumption | |
Minimum | 0.1 mA @ 12 VDC (SDI-12 standby) |
Typical | 3 mA @ 12 VDC (w/default measuring intervals) |
Maximum | 15 mA @ 6 VDC (with constant measurement of all parameters) |
Heating | Options: DC, AC, full-wave rectified AC |
Typical voltage | 12... 24 VDC / 12...17 VACrms (-10% ... +30%) |
Typical current | 0.8 A @ 12 VDC : 0.4 A @ 24 VDC |
Digital outputs | SDI-12, RS-232, RS-485, RS-422 |
Communication | SDI-12 v1.3, ASCII automatic & polled, |
protocols | NMEA 0183 v3.0 with query option |
Wind
WIND SPEED Range Response time Available variables Accuracy Output resolution | 0 ... 60 m/s 0.25 s average, maximum, and minimum ±3 % at 10 m/s 0.1 m/s (km/h, mph, knots) |
WIND DIRECTION Azimuth Response time Available variables Accuracy Output resolution | 0 ... 360° 0.25 s average, maximum, and minimum ±3.0° at 10 m/s 1° |
MEASUREMENT FRAME Averaging time Update interval | 1 ... 3600 s (= 60 min), at 1 s steps, on the basis of samples taken at 4, 2 or 1 Hz rate (configurable) 1 ... 3600 s (= 60 min), at 1 s steps |
Analog Input Options
Parameter | Element | Range | Input | Excitation | Resolution |
Temperature PT1000 | Resistor | 800 ... 1330 Ω | 2 wire 4 wire | 2.5 V | 16 bits |
Solar Radiation K&Z CMP3 | Thermopile | 0 ... 25 mV | 4 MΩ | - | 12 bits |
Level measurement IRU-9429S | Voltage | 0 ... 2.5 V 0 ... 5 V 0 ... 10 V | >10 kΩ | - | 12 bits |
Tipping Bucket RG13 | Frequency | 0 ... 100 Hz | 18 kΩ | 3.5 V | - |
Analog mA Output Options
Wind speed Wind direction Load impedance | 0 … 20 mA or 4 … 20 mA 0 … 20 mA or 4 … 20 mA 200 Ω max |
General Conditions
Housing protection class Temperature storage Temperature Relative humidity Pressure Wind | IP65 (without mounting kit) IP66 (with mounting kit attached) -60 ... +70 °C (-76 ... 158°F) -52 ... +60 °C (-60 ... +140 °F) 0 ... 100 %RH 600 ... 1100 hPa 0 ... 60 m/s |
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