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NRG IceFree3 Heated Anemometer

The electrically heated IceFree3 Anemometer's simple, robust design provides a proven and reliable solution in icing environments.

  • NRG IceFree3 Heated Anemometer

Configuration Options

The IceFree3 signal output is a variable amplitude sine wave, where frequency is proportional to wind speed. Patented off-axis correction minimizes errors in measuring up-slope or down-slope winds. The internal heater is powered by 24 VAC and allows for an operating temperature range of -40°C to 80°C (-40 °F to 176 °F). The optional 120/240 VAC to 24 VAC Transformer - IceFree3 Sensors is available to step down 120/240 VAC grid power.

The IceFree3 Heated Anemometer comes with a 10 m potted cable that can be extended to your desired length using the Power Cable Kit - IceFree3 Sensor 2C, sold separately and available in 10 meter increments up to 90 meters.

  • 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
  10m (33') cable (#3447) 10m (33') cable, Calibrated (#2578)
Description  
Sensor type 3 cup heated anemometer 3 cup heated anemometer
Applications
  • wind resource assessment
  • meteorological studies
  • ski area maintenance
  • environmental monitoring
  • wind resource assessment
  • meteorological studies
  • ski area maintenance
  • environmental monitoring
Sensor range maximum rated wind speed is 90 m/s (200 miles per hour) maximum rated wind speed is 90 m/s (200 miles per hour)
Instrument compatibility all NRG loggers all NRG loggers
Output signal  
Signal type variable amplitude sine wave, frequency proportional to wind speed variable amplitude sine wave, frequency proportional to wind speed
Anemometer Transfer Function m/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 Variation 99.7% 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)
Calibration available upon request - contact NRG for more information. calibration report supplied
Output signal range 0 Hz to 155 Hz 0 Hz to 155 Hz
Response characteristics  
Distance constant (63% recovery) n/a 7.6 m (25 feet)
Power requirements  
Heater 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)
Installation  
Mounting mounts 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 pipe mounts 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 pipe
Tools required 13 mm (0.5 inch) nut driver 13 mm (0.5 inch) nut driver
Environmental  
Operating temperature range -40 °C to 60 °C (-40 °F to 140 °F) -40 °C to 60 °C (-40 °F to 140 °F)
Operating humidity range 0 to 100% RH 0 to 100% RH
Physical  
Connections Signal 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
Weight 1.45 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)
Materials  
Cups precision balanced aluminum with black anodized finish and heat-resistant black paint precision balanced aluminum with black anodized finish and heat-resistant black paint
Body cast aluminum with black anodized finish and heat-resistant black paint cast aluminum with black anodized finish and heat-resistant black paint
Shaft centerless ground, stainless steel centerless ground, stainless steel
Bearing stainless steel ball bearings with application specific lubrication stainless steel ball bearings with application specific lubrication
Magnet 4 pole ceramic 4 pole ceramic
Coil single coil, shielded for ESD protection single coil, shielded for ESD protection
Cable
  • 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
Heater fully encapsulated, self-regulating fully encapsulated, self-regulating
Base cast aluminum with black anodized finish and heat-resistant black paint cast aluminum with black anodized finish and heat-resistant black paint
Boom Extensions

Boom Extensions

Extend and retrofit NRG booms to meet your project’s needs with our boom extensions and adapter kits.

Transformer - IceFree3 Sensors

Transformer - IceFree3 Sensors

Use this transformer with IceFree3 heated sensors to convert 120/240 VAC to 24 VAC.

Power Cable Kit - IceFree3 Sensor 2C + 3C

Power Cable Kit - IceFree3 Sensor 2C + 3C

This kit provides a junction box and cabling to extend the standard power and signal cables included with the IceFree3 Anemometer and the IceFree3 Vane.

Power Cable Kit - IceFree3 Sensor 2C

Power Cable Kit - IceFree3 Sensor 2C

These cables provide the power for the heating element in our IceFree3 Heated Anemometers and come in a variety of lengths.

Mounting Boom | 1.93m (76"), Tubular, IF3

Mounting Boom | 1.93m (76"), Tubular, IF3

Mount IceFree3 Anemometers, IceFree3 Wind Direction Vanes and RM Young 27106T Vertical Anemometers on NRG TallTowers™.

Sensor Calibration Service

Sensor Calibration Service

Use these services to recalibrate anemometers available from NRG.

Sensor Terminal Boot

Sensor Terminal Boot

Protect your sensor terminal from exposure to the elements with a terminal boot.

Symphonie® SCM Card

Symphonie® SCM Card

Condition your sensor’s output signal so that a SymphoniePLUS3 Data Logger can read it by installing a Symphonie Signal Conditioning Module (SCM).

Mounting Boom | 1.93m (76"), Lattice, IF3

Mounting Boom | 1.93m (76"), Lattice, IF3

Mount IceFree3 Anemometers, IceFree3 Wind Vanes and RM Young 27106T Vertical Anemometers on third-party lattice towers.