MultiMET Sensor
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Catalog excerpts

MultiMET Sensor - 1

SEBA MultiMET-Sensor Measurement of meteorological parameters such as wind speed and direction, relative humidity, temperature, solar radiation, barometric and pressure Product description Depending on the version, the instruments of the series SEBA MultiMET-Sensor consists of a 2-axes ultrasonic static anemometer for the measurement of: • Wind speed and direction, U-V Cartesian components of wind speed, Relative Humidity and temperature (optional), Diffuse solar radiation (optional), Barometric pressure (optional). In a single instrument the available measurement options combine the standard parameters used in meteorology, making the instrument a compact and light weight meteorological station. The MultiMET-Sensor features as standard a SDI-12 serial interface and optional RS 232, RS 485, RS 422 serial interfaces with NMEA, MODBUS-RTU communication protocols. All versions have optionally two analog outputs for wind speed and direction, which are factory configurable. The heater option prevents the accumulation of snow, as well as ice formation, allowing precise measurements in all environmental conditions. The heating requires a 230 VAC power supply. The low power consumption of the sensor allows installation in remote sites, where a photovoltaic panel and backup battery (without sensor heating) can supply power. Measuring principle of wind speed and direction Wind speed and direction are determined by measuring the transit time of ultrasonic pulses between the transducer that generates the pulse to the receiving transducer. The instrument uses two pairs of transducers oriented along two orthogonal axes. Detecting the wind speed along two axes allows the determination of the wind intensity and the wind direction. The sensor uses transit time measurements in both directions of the ultrasonic pulse between two transducers of the same pair. The travel times in two opposing directions are defined as tA (for- ward direction time) and tR (reverse direction time). If wind speed is zero, tA and tR values are equal. In the presence of wind, tA or tR differ and the comparison between the two time values allows the determination of wind direction and the intensity of wind. By measuring the travel time in both directions the system allows for a compensation of air temperature, air humidity and barometric pressure that influence the transmission speed of ultrasound in the air, and delivers corrected high accuracy measurements.

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MultiMET Sensor - 2

Technical data Wind speed: Sensor type: Measuring range: Resolution: Accuracy: Wind direction: Sensor type: Measuring range: Resolution: Accuracy: Air temperature: Sensor type: Measuring range: Resolution: Accuracy: Relative humidity: Sensor type: Measuring range: Resolution: Accuracy (at T = 15…35° C): Accuracy (at T = -40…+60° C): Barometric Pressure: Sensor type: Measuring range: Resolution: Accuracy: Solar radiation: Sensor type: Measuring range: Resolution: Accuracy: General features: Power Supply: Power consumption: Serial outputs: Communication protocols: Analog outputs: Electrical...

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