NRG Systems

NRG IceFree3 Heated Anemometer

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

  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

NRG Systems • 110 Riggs Road • Hinesburg, Vermont 05461 • +1 802-482-2255 • info@nrgsystems.com