RNRG Ice Free 3 Heated Anemometer

• Made of cast aluminum with black anodized finish and heat-resistant paint
• Efficiently transfers heat from encapsulated, self-regulating heaters
• Easily mounts to a 27 mm (1.05") diameter mounting pipe
• Powered by 24V AC or DC
• Compatible with a wide range of remote site equipment

IceFree3 Heated Anemometer | 10m (33') cable (#3447)IceFree3 Heated Anemometer | 10m (33') cable, Calibrated (#2578)DescriptionSensor type3 cup heated anemometer3 cup heated anemometerApplications

• wind resource assessment
• wind turbine control
• meteorological studies
• ski area maintenance
• environmental monitoring

• wind resource assessment
• wind turbine control
• meteorological studies
• ski area maintenance
• environmental monitoring

Sensor rangemaximum rated wind speed is 90 m/s (200 miles per hour)maximum rated wind speed is 90 m/s (200 miles per hour)Instrument compatibilityall NRG loggersall NRG loggersOutput signalSignal typevariable amplitude sine wave, frequency proportional to wind speedvariable amplitude sine wave, frequency proportional to wind speedAnemometer Transfer Functionm/s = (Hz x 0.572) + 1.00 
[miles per hour = (Hz x 1.28) + 2.24]m/s = (Hz x 0.572) + 1.00 
[miles per hour = (Hz x 1.28) + 2.24]Sensor to Sensor Variation99.7% of sensors fall within 4.3% of stated transfer function (based on over 800 samples)99.7% of sensors fall within 4.3% of stated transfer function (based on over 800 samples)Calibrationavailable upon request - contact NRG for more information.calibration report suppliedOutput signal range0 Hz to 155 Hz0 Hz to 155 HzResponse characteristicsDistance constant (63% recovery)n/a7.6 m (25 feet)Power requirementsHeater supply voltage

• 24 V AC/DC
• optional transformer available

• 24 V AC/DC
• optional transformer available

Heater supply current

• Inrush: 8 A maximum
• Steady state: 1 A at 20 °C (68 °F), 4 A under maximum thermal load (head frozen in clear ice then powered on)

• Inrush: 8 A maximum
• Steady state: 1 A at 20 °C (68 °F), 4 A under maximum thermal load (head frozen in clear ice then powered on)

InstallationMountingmounts to a 27 mm (1.05 inch) diameter (3/4 inch IPS) pipe with a 5/16 inch nut and bolt; cabling exits into mounting pipemounts to a 27 mm (1.05 inch) diameter (3/4 inch IPS) pipe with a 5/16 inch nut and bolt; cabling exits into mounting pipeTools required13 mm (0.5 inch) nut driver13 mm (0.5 inch) nut driverEnvironmentalOperating temperature range-40 °C to 60 °C (-40 °F to 140 °F)-40 °C to 60 °C (-40 °F to 140 °F)Operating humidity range0 to 100% RH0 to 100% RHPhysicalConnectionsSignal Cable

• clear: signal
• black: ground
• shield drain
  Heater Cable
• black / white: heater power (AC/DC)

Signal Cable

• clear: signal
• black: ground
• shield drain
  Heater Cable
• black / white: heater power (AC/DC)

Cable length

• Signal & Power cables: 10.0m (32.8 feet)
• extension kits available

• Signal & Power cables: 10.0 m (32.8 feet)
• extension kits available

Weight1.45 kg (3.2 pounds)1.45 kg (3.2 pounds)Dimensions

• overall assembly height : 224 mm (8.82 inches)
• body diameter: 70 mm (2.75 inches)
• swept diameter of rotor: 127 mm (5 inches)

• overall assembly height : 224 mm (8.82 inches)
• body diameter: 70 mm (2.75 inches)
• swept diameter of rotor: 127 mm (5 inches)

MaterialsCupsprecision balanced aluminum with black anodized finish and heat-resistant black paintprecision balanced aluminum with black anodized finish and heat-resistant black paintBodycast aluminum with black anodized finish and heat-resistant black paintcast aluminum with black anodized finish and heat-resistant black paintShaftcenterless ground, stainless steelcenterless ground, stainless steelBearingstainless steel ball bearings with application specific lubricationstainless steel ball bearings with application specific lubricationMagnet4 pole ceramic4 pole ceramicCoilsingle coil, shielded for ESD protectionsingle coil, shielded for ESD protectionCable

• Signal: 2 conductor 20 AWG, chrome PVC jacket with overall foil shield and drain
• Heater: 2 conductor 20 AWG, Teflon jacket with braid shield and drain

• Signal: 2 conductor 20 AWG, chrome PVC jacket with overall foil shield and drain
• Heater: 2 conductor 20 AWG, Teflon jacket with braid shield and drain

Enclosure

• sealed to IP55
• heater is epoxy encapsulated to IP65

• sealed to IP55
• heater is epoxy encapsulated to IP65

Heaterfully encapsulated, self-regulatingfully encapsulated, self-regulatingBasecast aluminum with black anodized finish and heat-resistant black paintcast aluminum with black anodized finish and heat-resistant black paint