NM150

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The NM150 Ultrasonic Weather Station

By New Mountain Innovations

No mechanical parts!

The New Mountain weather station Instrument is the only all-in-one weather sensor that calculates both true and apparent* wind speed and direction, barometric pressure, air temperature, relative humidity, dew point and wind chill temperature. The UV stabilized, ultra compact housing is fully waterproof and resistant to chemicals.

Please note:

	This sensor requires a PC connection for displaying/storing data.
	This unit doesn't measure rainfall, if you require rainfall data, our available options can be found here.

Sensors Provide:

Apparent Wind Speed & Direction	Ultrasonic anemometer
Air Temperature	Based on a negative temperature coefficient thermistor that measures the ambient air temperature
Relative Humidity	Measured with a capacitive cell humidity sensor
Barometric Pressure	Measured using a temperature-compensated silicon piezoresistive pressure sensor
Magnetic Compass Heading	Two-axis magneto-inductive sensors
Pitch & Roll Angles	Three-axis MEMS accelerometer
Position, Speed & Course Over Ground	Global Positioning System (GPS) receiver

Specifications:

Wind Speed Range	0.5 to 99.5 knots (0.6 MPH to 114.5 MPH)
Wind Speed Resolution	0.1 knot (0.1 MPH)
Wind Speed Accuracy	±1 knot (±1.1 MPH) or ±4%, whichever is greater
Wind Direction Azimuth	0° to 360°
Wind Direction Resolution	1°
Wind Direction Sensitivity	±1.5°
Temperature Range	-30°C to 50°C(-22°F to 122°F)
Temperature Resolution	0.1°C (0.1°F)
Compass Accuracy	±2° static heading
Barometric Pressure Range	850 to 1150 mbar (25 to 34 inHg)
Barometric Pressure Accuracy	±1.5°
Relative Humidity Range	10 to 95% RH
Relative Humidity Accuracy	±4% RH
Operating Frequency	40 kHz
Supply Voltage	10 VDC to 16 VDC
Weight	285 grams (0.6 lb)
Power Consumption	<100 mA in normal operation (up to 1 Amp with heater)
Sensor Baud Rate	4800 bps can be increased to 38,400 bps with a command
Thread Size	1-14" UNS (Unified National Standard)

How It Works:

The ultrasonic wind sensor (an ultrasonic anemometer) measures apparent wind speed and direction*. The weather station Instrument contains four ultrasonic transducers, visible through the four holes in the top of the sensor’s wind channel (see figure 1). These transducers operate in pairs—one transducer injects a pulse into the air, and the other (directly opposite to it) listens for the arrival of that pulse (see figure 2). Each pulse bounces off the anodized aluminum plate at the bottom of the wind channel and is carried by the wind to arrive at the opposing transducer a short time later. When there is no wind, the pulse travels at the speed of sound from the sender to the receiver. Whenever the wind is blowing in that direction, the pulse will arrive sooner than if the air is still. Similarly, whenever the wind is blowing in the opposite direction, the pulse will arrive later than if the air is still. The four transducers take turns in sending and receiving pulses to cover all eventualities of wind direction. A built-in microprocessor combines the measurements from all four transducers to calculate the resultant wind speed and direction. The sensor monitors the air temperature, to compensate for the fact that the speed of sound in air changes with temperature. (The aluminum plate heats up to prevent frost and moisture from altering the wind readings.) Flow disturbances caused by the five posts are compensated for in software. Each Weather Station Instrument is calibrated in a wind tunnel to provide compensation for variations in production as well as asymmetry in the airflow channel.

* The Weather Station Instrument has the unique ability to display both true and apparent wind. True wind is the actual motion of the air relative to the earth. Apparent wind is the wind which an observer experiences while moving or on a moving vehicle. It is the result of these two motions—the actual motion of the air (the true wind) and the motion of the vehicle. If the vehicle is not moving, then the true and apparent wind will be the same.

Comes complete with:

	Sensor
	100' RS 485 data cable
	Data cable to DB9 (serial) interface
	12V power supply
	Weather View 32 software
	Weathercaster software

Includes 2 year warranty from manufacturer.

Optional Accessories:

100ft. Waterproof Cable Extension for NM150 Weather Station.

The Mobility Package includes a USB 12volt interface, which interacts with weathercaster software and provides ability to change advanced settings. Calculates your speed via GPS to output a true with speed when driving.