Freezing-Rain and Ice Detectors / 0871LH1
Warns of Ice Danger
Protects roads, power lines, aircraft, wind turbines
Protects roads, power lines, aircraft, wind turbines
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.
Read MoreBenefits 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
Images
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.
Specifications
| Measurement Description | Ice detected/no ice detected |
| Range | State dependent (ICE = 1, NO ICE = 0) |
| 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) |
| Shock | DO-160C |
| Operating Voltage | 18 to 29.5 Vdc |
| Base Diameter | 7.32 cm (2.88 in.) |
| Base Height | 3.81 cm (1.5 in.) |
| Strut Diameter | 3.10 cm (1.22 in.) |
| Strut Height | 2.54 cm (1.0 in.) |
| Plate Dimensions | 7.37 x 7.37 x 0.22 cm (2.9 x 2.9 x 0.085 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 |
|
| Fail State |
|
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 |