Der 0871LH1 ist ein Sensor zur Erkennung von Eisbildung. Er vibriert mit einer nominalen Frequenz von 40 kHz. Wenn sich eine Eisschicht auf dem Sensor bildet sorgt die zusätzliche Masse für eine Verringerung der Frequenz. Bei der Änderung, die 0,5 mm Eis entspricht, werden die Signale für "Eis" (RS422 und diskret) für 60s aktiviert. Danach heizt sich der Sensor auf und taut das Eis ab.
Durch Einsatz dieses Sensors kann man Schäden an Strom- oder Telefonleitungen, Windturbinen oder Flugzeugflügeln vermeiden oder vor Unfällen im Straßenverkehr warnen.
Lesen Sie mehrThe 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.
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 |
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Sensing Mode | 5 W (maximum) |
Deicing Mode | 27 W (maximum) |
Operating Modes |
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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 |
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Ice Signal (No Icing) | Open |
Ice Signal (Icing Detected) | Ground |
Status Signal (Operating Correctly) | Ground |
Status Signal (Failure Detected) | Open |
RS-422 Output Signals |
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Ice Signal |
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Fail State |
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Built-in Test (BIT) |
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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 |
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Mechanical | MS27474T10B199PN |
Mating | MS27474T10B199SN |
Number of FAQs related to 0871LH1: 3
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This depends on the climate conditions. The maximum heating up time is 25 s.
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.