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UTAS Model 0871ND Ice Detector

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James Ericson

UTC Aerospace Systems produces the 0871ND series of ice detectors that can detect ice accumulation and calculate ice accretion rate and liquid water content. The ice detectors use magnetostrictive technology to sense shifts in resonance frequency as ice builds up. They are designed to meet aerospace certification standards and provide robust ice protection, remote diagnostics, and customer-configurable outputs.

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Ice Detectors 0871ND Series With over 50 years of ice detection experience and innovation, UTC Aerospace Systems continues to be at the forefront of icing technology. Flexible, robust designs detect ice in a wide range of icing environments and have demonstrated their success around the world on both aircraft and ground-based applications. UTC Aerospace Systems ice detectors do more than just detect the presence of ice—they can be used to calculate ice accretion rate and liquid water content (LWC). Operational Considerations UTC Aerospace Systems ice detectors are designed to meet the demanding aerospace requirements of RTCA DO-160 for environmental conditions. These factors, as well as droplet impingement and unit orientation, should be considered with each installation. Software meets DO-178B, Level A. Hardware development follows DO-254, Level A standards. The unit complies with SAE AS5498. 7.8 in. (19.8 cm) 3.3 in. dia. (8.4 cm) PhotocourtesyEmbraer
General Specifications Connector D38999 / 24FD97PN Power Consumption Sensing Mode 5 Watts max. at 28 VDC De-icing Mode 330 Watts max. at 28 VDC Discrete Outputs: Customer-selectable output configuration Ice Open / Ground Status Open / Ground Size Weight 1.0 lbs. max. (0.46 kg) Serial Ports RS-485 (RS-232 available with line level converter) Ice Detectors 0871ND Series For additional information: UTC Aerospace Systems Sensors & Integrated Systems 14300 Judicial Road Burnsville, MN 55306 U.S.A. Tel: +1 952 892 4000 Fax: +1 952 892 4800 www.utcaerospacesystems.com 4243A LIT 2/13 © Rosemount Aerospace Inc., 2013 Printed in the U.S.A. The UTC Aerospace Systems name, logotype and symbol are trademarks of UTC Technologies. Benefits & Features Frequency data allows multiple calculations to be performed Heated strut and probe provide robust de-icing capability The small size offers greater flexibility for mounting and installation Built-in test capability verifies internal electronics are properly functioning Diagnostic information available to aid failure troubleshooting via serial communications Compatible with aluminum or composite skin Customer-selectable configuration of ice outputs Ice Detection Sensitivity Sensitive to less than 0.001 inches of ice Customer-selectable ice signal threshold (typically 0.020 inches) Theory of Operation UTC Aerospace Systems ice detectors use a magnetostrictive technology to drive the sensing probe to resonate at its natural frequency. As ice accretes on the probe, a shift in resonance frequency occurs. When the resonance frequency reaches the setpoint, an ice signal is activated and the strut and probe de-ice. The heaters remain on for a predetermined time once ice has debonded from the probe to ensure the ice is removed. Icing Measurements The rate of ice accretion on ice detectors and monitored surfaces—for example, wing, tail, engine nacelle, etc.— depends on a complex heat transfer balance dependent on many atmospheric and aircraft parameters. By understanding these relationships, ice detector output can be used to activate ice protection and stall protection. It can also be used to calculate ice accretion rate and liquid water content (LWC).

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UTAS Model 0871ND Ice Detector

  • 1. Ice Detectors 0871ND Series With over 50 years of ice detection experience and innovation, UTC Aerospace Systems continues to be at the forefront of icing technology. Flexible, robust designs detect ice in a wide range of icing environments and have demonstrated their success around the world on both aircraft and ground-based applications. UTC Aerospace Systems ice detectors do more than just detect the presence of ice—they can be used to calculate ice accretion rate and liquid water content (LWC). Operational Considerations UTC Aerospace Systems ice detectors are designed to meet the demanding aerospace requirements of RTCA DO-160 for environmental conditions. These factors, as well as droplet impingement and unit orientation, should be considered with each installation. Software meets DO-178B, Level A. Hardware development follows DO-254, Level A standards. The unit complies with SAE AS5498. 7.8 in. (19.8 cm) 3.3 in. dia. (8.4 cm) PhotocourtesyEmbraer
  • 2. General Specifications Connector D38999 / 24FD97PN Power Consumption Sensing Mode 5 Watts max. at 28 VDC De-icing Mode 330 Watts max. at 28 VDC Discrete Outputs: Customer-selectable output configuration Ice Open / Ground Status Open / Ground Size Weight 1.0 lbs. max. (0.46 kg) Serial Ports RS-485 (RS-232 available with line level converter) Ice Detectors 0871ND Series For additional information: UTC Aerospace Systems Sensors & Integrated Systems 14300 Judicial Road Burnsville, MN 55306 U.S.A. Tel: +1 952 892 4000 Fax: +1 952 892 4800 www.utcaerospacesystems.com 4243A LIT 2/13 © Rosemount Aerospace Inc., 2013 Printed in the U.S.A. The UTC Aerospace Systems name, logotype and symbol are trademarks of UTC Technologies. Benefits & Features Frequency data allows multiple calculations to be performed Heated strut and probe provide robust de-icing capability The small size offers greater flexibility for mounting and installation Built-in test capability verifies internal electronics are properly functioning Diagnostic information available to aid failure troubleshooting via serial communications Compatible with aluminum or composite skin Customer-selectable configuration of ice outputs Ice Detection Sensitivity Sensitive to less than 0.001 inches of ice Customer-selectable ice signal threshold (typically 0.020 inches) Theory of Operation UTC Aerospace Systems ice detectors use a magnetostrictive technology to drive the sensing probe to resonate at its natural frequency. As ice accretes on the probe, a shift in resonance frequency occurs. When the resonance frequency reaches the setpoint, an ice signal is activated and the strut and probe de-ice. The heaters remain on for a predetermined time once ice has debonded from the probe to ensure the ice is removed. Icing Measurements The rate of ice accretion on ice detectors and monitored surfaces—for example, wing, tail, engine nacelle, etc.— depends on a complex heat transfer balance dependent on many atmospheric and aircraft parameters. By understanding these relationships, ice detector output can be used to activate ice protection and stall protection. It can also be used to calculate ice accretion rate and liquid water content (LWC).