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AIRMAR WeatherStation 150WX Weather Sensor

RM72004,0000171 -19-07MAY13-1/1

CZ76372,000072E -19-20OCT14-1/1

Theory of Operation

The AIRMAR WeatherStation 150WX weather sensor

provides air temperature, relative humidity, wind speed,

and wind direction. Air temperature, relative humidity,

and wind speed are used to calculate evapotranspiration

(ET), a critical measurement in irrigation planning and

scheduling.

A—Weather Sensor

B—Sensor Extension Piece

C—Wiring Harness with 8-Pin

Connector

PC16619 —UN—25FEB13

Specifications

NOTE: Specifications are for a new sensor. System

performance may vary based on application.

Measurements

•

Measurement Time: 10 ms

•

Power: 2.5 VDC at 2 mA, to 5 VDC at 7 mA

•

Output: 320–1000 mV at 3 V excitation

•

Operating Temperature Range: -40–55 °C (-40–131 °F)

•

Air Temperature Range: -40–55 °C (-40–131 °F)

•

Air Temperature Resolution: 0.1 °C (0.1 °F)

•

Air Temperature Accuracy: ±1 °C (±1.8 °F), wind greater

than 7.4 km/h (4.6 mph)

•

Relative Humidity Range: 10–95% RH

•

Relative Humidity Accuracy: ±4% RH

•

Wind Speed Range: 0–144 km/h (0–90 mph)

•

Wind Speed Accuracy, Low Wind Speed: 0–18.5 km/h

(0–11.5 mph), RMS error of 1.8 km/h (1.1 mph) + 10%

of reading

•

Wind Speed Accuracy, High Wind Speed: 18.5–144.5

km/h (11.5–90 mph), RMS error of 3.7 km/h (2.3 mph)

or 5% RMS, whichever is greater

•

Wind Direction Range: 0° to 360°

•

Wind Direction Resolution: 0.1°

•

Wind Direction Accuracy, Low Wind Speed: 7.4–18.5

km/h (4.6–11.5 mph), 5° RMS, typical

•

Wind Direction Accuracy, High Wind Speed: Greater

than 18.5 km/h (greater than 11.5 mph), 2° RMS, typical

NOTE: When wind speed is less than 7.4 km/h (4.6

mph) and (or) air temperature is below 0 °C (32

°F), wind, temperature, and relative humidity

readings are less accurate.

RMS error (root-mean-square error) is a measure

of the differences between values predicted by a

model and values actually observed.

Dimensions, Sensor Body

•

Diameter, Top: 72 mm (2.83 in.)

•

Diameter, Nut Assembly, Connection With Sensor

Body: 45 mm (1.77 in.)

•

Length, Total: 131 mm (5.16 in.)

•

Length, Sensor Body: 90 mm (3.54 in.)

45-1

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PN=33

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