RNRG IceFree3 Heated Anemometer

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Details

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.

Benifits

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

Specifications

	IceFree3 Heated Anemometer \| 10m (33') cable (#3447)	IceFree3 Heated Anemometer \| 10m (33') cable, Calibrated (#2578)
Description
Sensor type	3 cup heated anemometer	3 cup heated anemometer
Applications	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 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

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