0871LH1 Freezing-Rain Sensor
Warns of Ice Danger
Protects roads, power lines, aircraft, wind turbines
weather applications water applications energy applications gas flux & turbulence applications infrastructure applications soil applications

Overview

The 0871LH1, manufactured by Goodrich, is a sensor that detects the presence of icing conditions so that appropriate actions can be taken to prevent damage to power and communication lines, to warn of road hazards, or to keep ice off wind turbine blades or a plane’s wings.

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Benefits and Features

  • Can be used to help prevent damage to power lines, and to warn of icy road hazards, ice on planes' wings, and ice on wind turbine blades
  • Automatically defrosts itself when ice accumulation reaches 0.5 mm

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Detailed Description

The 0871LH1 uses resonant frequencies to determine the presence of icing conditions. Its main component is a nickel alloy rod that has a natural resonant frequency of 40 kHz. As ice collects on the rod, the added mass causes the resonant frequency to decrease. When the frequency decreases to 130 Hz (or 0.02-in. layer of ice), an internal heater automatically defrosts the sensor.

Wind Energy Applications

The 0871LH1 can detect ice on a wind turbine’s blade, which is undesirable because:

  • Blade can throw large chunks of ice a considerable distance—an extremely dangerous, potentially lethal situation.
  • Formation of ice can cause unbalanced loading on the turbine’s blades, bearings, and gear box.
  • Ice reduces the turbine’s power output.

The 0871LH1 can be used for wind prospecting applications by helping predict the amount of time a potential wind power site may be out of commission due to icing conditions. Additionally, the sensor lets users know when ice is preventing their wind sensors from providing data.

Specifications

Set Point Ice signal activates when probe ice thickness exceeds 0.5 mm ±0.13 mm (0.02 in. ±0.006 in.)
Output Format RS-422 output operates at 9600 bps.
Operating Temperature Range -55° to +71°C
Storage Temperature Range -65° to +90°C
Random Vibration 7.9 grms (DO-160C, Category E)
Base Diameter 7.32 cm (2.88 in.)
Shock DO-160C
Base Height 3.81 cm (1.5 in.)
Plate Dimensions 7.37 x 7.37 x 0.22 cm (2.9 x 2.9 x 0.085 in.)
Strut Diameter 3.10 cm (1.22 in.)
Operating Voltage 18 to 29.5 Vdc
Strut Height 2.54 cm (1.0 in.)
Rod Diameter 0.64 cm (0.25 in.)
Rod Height 2.54 cm (1.0 in.)
Weight 0.3 kg (0.7 lb)

Power Draw @ 24 Vdc

Sensing Mode 5 W (maximum)
Deicing Mode 27 W (maximum)

Operating Modes

Sensing Operating with no ice or with probe ice thickness below the set point
Deicing Operating with probe ice thickness exceeding the set point

Discrete Output Signals

Ice Signal (No Icing) Open
Ice Signal (Icing Detected) Ground
Status Signal (Operating Correctly) Ground
Status Signal (Failure Detected) Open

RS-422 Output Signals

Ice Signal
  • 1 = Ice
  • 0 = No Ice
Fail State
  • 1 = Fail
  • 0 = No Fail (OK)

Built-in Test (BIT)

Commanded Performed at initial power-up. If a failure is detected and verified, the ice detector stops detecting and annunciating icing conditions, the heaters are disabled, and a failure is annunciated.
Continuous Hardware and software BIT verifies that internal electronics are functioning properly.

Electrical Connectors

Mechanical MS27474T10B199PN
Mating MS27474T10B199SN

Compatibility

Datalogger Considerations

Compatible Contemporary Dataloggers

CR200(X) Series CR800/CR850 CR1000 CR3000 CR9000X

Compatible Retired Dataloggers

CR500 CR510 CR10 CR10X 21X CR23X CR9000 CR5000 CR7X

Frequently Asked Questions

Number of FAQs related to 0871LH1: 3

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  1. The sensor determines if there is an ICE or NO ICE condition. If the sensor is covered in ice, it reports an ICE condition and turns on the heater to defrost itself.