nomad HB3289-01 Users Handbooks
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Operating temperature: -25° to +80°C6.2.3 General SpecificationPart number: 187012BSupply voltage: 8 to 24 V (supplied from environmental case)Power consumption: Typically 10 mA at 12 VOutput calibrationTemperature: 0 to 1 V for -40 to + 60°CHumidity: 0 to 1 V for 0 to 100% RH6.3 Wind Speed SensorThe sensitive three cup anemometer ismounted at one end of the sensor headcross-arm. The rotational speed is monitoredusing an infra-red light source, interrupterand optical sensor that provides 20 pulsesfrom 0 to 5 V per revolution. Thisnon-contacting design can measure windspeeds up to 75 m/sec.The instrument has an anodisedaluminium alloy outer case that offers adurable, all-weather construction suitable forinstallation in harsh environments.An output from this sensor is led toa terminal box on the sensor cross arm, fromwhere a single sensor cable is taken to the7-pin socket on the bottom panel of the environmental case.6.3.1 Wind Speed Sensor SpecificationPart number: 178031CSensor type: Three cup anemometerTransducer: Optical interrupterMaximum wind speed: 75 m/sStarting velocity: Typically 0.3 m/sDistance constant: Typically 3.5 m/sTime constant: Typically <0.5 sResolution: 7.84 cmNon-linearity: <±0.6 %Accuracy: ±0.3 m/s below 3 m/s±3% over 3 m/sOutput calibration: 12.75 Hz/m/sOutput: 20 pulses per revolution 0 to 5 VOperating temp: -20°C to + 70°CStabilisation time: <1 sec from power onSupply voltage: 6 - 28 V DC (supplied from environmentalcase)Power consumption: 3 mA6.4 Wind Direction SensorThe weather vane is mounted at the other end of the sensor head cross-armfrom the anemometer.DO NOT loosen the fitting of the weather vane, as this carries aguide mark “N” that must point north to orient the cross arm correctly.The wind vane is a small lightweight GMR design that offers a rapidresponse to changes in wind direction with virtually friction free sensing. The01057Figure 12: Wind speed sensorStandard SensorsPage 43 of 68NOMAD Portable Weather StationUsers Handbook |
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